openmp/runtime/src/kmp_csupport.c

/*
 * kmp_csupport.c -- kfront linkage support for OpenMP.
 */


//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.txt for details.
//
//===----------------------------------------------------------------------===//


#include "omp.h"        /* extern "C" declarations of user-visible routines */
#include "kmp.h"
#include "kmp_i18n.h"
#include "kmp_itt.h"
#include "kmp_error.h"
#include "kmp_stats.h"

#if OMPT_SUPPORT
#include "ompt-internal.h"
#include "ompt-specific.h"
#endif

#define MAX_MESSAGE 512

/* ------------------------------------------------------------------------ */
/* ------------------------------------------------------------------------ */

/*  flags will be used in future, e.g., to implement */
/*  openmp_strict library restrictions               */

/*!
 * @ingroup STARTUP_SHUTDOWN
 * @param loc   in   source location information
 * @param flags in   for future use (currently ignored)
 *
 * Initialize the runtime library. This call is optional; if it is not made then
 * it will be implicitly called by attempts to use other library functions.
 *
 */
void
__kmpc_begin(ident_t *loc, kmp_int32 flags)
{
    // By default __kmp_ignore_mppbeg() returns TRUE.
    if (__kmp_ignore_mppbeg() == FALSE) {
        __kmp_internal_begin();

        KC_TRACE( 10, ("__kmpc_begin: called\n" ) );
    }
}

/*!
 * @ingroup STARTUP_SHUTDOWN
 * @param loc source location information
 *
 * Shutdown the runtime library. This is also optional, and even if called will not
 * do anything unless the `KMP_IGNORE_MPPEND` environment variable is set to zero.
  */
void
__kmpc_end(ident_t *loc)
{
    // By default, __kmp_ignore_mppend() returns TRUE which makes __kmpc_end() call no-op.
    // However, this can be overridden with KMP_IGNORE_MPPEND environment variable.
    // If KMP_IGNORE_MPPEND is 0, __kmp_ignore_mppend() returns FALSE and __kmpc_end()
    // will unregister this root (it can cause library shut down).
    if (__kmp_ignore_mppend() == FALSE) {
        KC_TRACE( 10, ("__kmpc_end: called\n" ) );
        KA_TRACE( 30, ("__kmpc_end\n" ));

        __kmp_internal_end_thread( -1 );
    }
}

/*!
@ingroup THREAD_STATES
@param loc Source location information.
@return The global thread index of the active thread.

This function can be called in any context.

If the runtime has ony been entered at the outermost level from a
single (necessarily non-OpenMP<sup>*</sup>) thread, then the thread number is that
which would be returned by omp_get_thread_num() in the outermost
active parallel construct. (Or zero if there is no active parallel
construct, since the master thread is necessarily thread zero).

If multiple non-OpenMP threads all enter an OpenMP construct then this
will be a unique thread identifier among all the threads created by
the OpenMP runtime (but the value cannote be defined in terms of
OpenMP thread ids returned by omp_get_thread_num()).

*/
kmp_int32
__kmpc_global_thread_num(ident_t *loc)
{
    kmp_int32 gtid = __kmp_entry_gtid();

    KC_TRACE( 10, ("__kmpc_global_thread_num: T#%d\n", gtid ) );

    return gtid;
}

/*!
@ingroup THREAD_STATES
@param loc Source location information.
@return The number of threads under control of the OpenMP<sup>*</sup> runtime

This function can be called in any context.
It returns the total number of threads under the control of the OpenMP runtime. That is
not a number that can be determined by any OpenMP standard calls, since the library may be
called from more than one non-OpenMP thread, and this reflects the total over all such calls.
Similarly the runtime maintains underlying threads even when they are not active (since the cost
of creating and destroying OS threads is high), this call counts all such threads even if they are not
waiting for work.
*/
kmp_int32
__kmpc_global_num_threads(ident_t *loc)
{
    KC_TRACE( 10, ("__kmpc_global_num_threads: num_threads = %d\n", __kmp_nth ) );

    return TCR_4(__kmp_nth);
}

/*!
@ingroup THREAD_STATES
@param loc Source location information.
@return The thread number of the calling thread in the innermost active parallel construct.

*/
kmp_int32
__kmpc_bound_thread_num(ident_t *loc)
{
    KC_TRACE( 10, ("__kmpc_bound_thread_num: called\n" ) );
    return __kmp_tid_from_gtid( __kmp_entry_gtid() );
}

/*!
@ingroup THREAD_STATES
@param loc Source location information.
@return The number of threads in the innermost active parallel construct.
*/
kmp_int32
__kmpc_bound_num_threads(ident_t *loc)
{
    KC_TRACE( 10, ("__kmpc_bound_num_threads: called\n" ) );

    return __kmp_entry_thread() -> th.th_team -> t.t_nproc;
}

/*!
 * @ingroup DEPRECATED
 * @param loc location description
 *
 * This function need not be called. It always returns TRUE.
 */
kmp_int32
__kmpc_ok_to_fork(ident_t *loc)
{
#ifndef KMP_DEBUG

    return TRUE;

#else

    const char *semi2;
    const char *semi3;
    int line_no;

    if (__kmp_par_range == 0) {
        return TRUE;
    }
    semi2 = loc->psource;
    if (semi2 == NULL) {
        return TRUE;
    }
    semi2 = strchr(semi2, ';');
    if (semi2 == NULL) {
        return TRUE;
    }
    semi2 = strchr(semi2 + 1, ';');
    if (semi2 == NULL) {
        return TRUE;
    }
    if (__kmp_par_range_filename[0]) {
        const char *name = semi2 - 1;
        while ((name > loc->psource) && (*name != '/') && (*name != ';')) {
            name--;
        }
        if ((*name == '/') || (*name == ';')) {
            name++;
        }
        if (strncmp(__kmp_par_range_filename, name, semi2 - name)) {
            return __kmp_par_range < 0;
        }
    }
    semi3 = strchr(semi2 + 1, ';');
    if (__kmp_par_range_routine[0]) {
        if ((semi3 != NULL) && (semi3 > semi2)
          && (strncmp(__kmp_par_range_routine, semi2 + 1, semi3 - semi2 - 1))) {
            return __kmp_par_range < 0;
        }
    }
    if (KMP_SSCANF(semi3 + 1, "%d", &line_no) == 1) {
        if ((line_no >= __kmp_par_range_lb) && (line_no <= __kmp_par_range_ub)) {
            return __kmp_par_range > 0;
        }
        return __kmp_par_range < 0;
    }
    return TRUE;

#endif /* KMP_DEBUG */

}

/*!
@ingroup THREAD_STATES
@param loc Source location information.
@return 1 if this thread is executing inside an active parallel region, zero if not.
*/
kmp_int32
__kmpc_in_parallel( ident_t *loc )
{
    return __kmp_entry_thread() -> th.th_root -> r.r_active;
}

/*!
@ingroup PARALLEL
@param loc source location information
@param global_tid global thread number
@param num_threads number of threads requested for this parallel construct

Set the number of threads to be used by the next fork spawned by this thread.
This call is only required if the parallel construct has a `num_threads` clause.
*/
void
__kmpc_push_num_threads(ident_t *loc, kmp_int32 global_tid, kmp_int32 num_threads )
{
    KA_TRACE( 20, ("__kmpc_push_num_threads: enter T#%d num_threads=%d\n",
      global_tid, num_threads ) );

    __kmp_push_num_threads( loc, global_tid, num_threads );
}

void
__kmpc_pop_num_threads(ident_t *loc, kmp_int32 global_tid )
{
    KA_TRACE( 20, ("__kmpc_pop_num_threads: enter\n" ) );

    /* the num_threads are automatically popped */
}


#if OMP_40_ENABLED

void
__kmpc_push_proc_bind(ident_t *loc, kmp_int32 global_tid, kmp_int32 proc_bind )
{
    KA_TRACE( 20, ("__kmpc_push_proc_bind: enter T#%d proc_bind=%d\n",
      global_tid, proc_bind ) );

    __kmp_push_proc_bind( loc, global_tid, (kmp_proc_bind_t)proc_bind );
}

#endif /* OMP_40_ENABLED */


/*!
@ingroup PARALLEL
@param loc  source location information
@param argc  total number of arguments in the ellipsis
@param microtask  pointer to callback routine consisting of outlined parallel construct
@param ...  pointers to shared variables that aren't global

Do the actual fork and call the microtask in the relevant number of threads.
*/
void
__kmpc_fork_call(ident_t *loc, kmp_int32 argc, kmpc_micro microtask, ...)
{
  int         gtid = __kmp_entry_gtid();

#if (KMP_STATS_ENABLED)  
  int inParallel = __kmpc_in_parallel(loc);
  if (inParallel)
  {
      KMP_COUNT_BLOCK(OMP_NESTED_PARALLEL);
  }
  else
  {
      KMP_STOP_EXPLICIT_TIMER(OMP_serial);
      KMP_COUNT_BLOCK(OMP_PARALLEL);
  }
#endif

  // maybe to save thr_state is enough here
  {
    va_list     ap;
    va_start(   ap, microtask );

#if OMPT_SUPPORT
    int tid = __kmp_tid_from_gtid( gtid );
    kmp_info_t *master_th = __kmp_threads[ gtid ];
    kmp_team_t *parent_team = master_th->th.th_team;
    if (ompt_enabled) {
       parent_team->t.t_implicit_task_taskdata[tid].
           ompt_task_info.frame.reenter_runtime_frame = __builtin_frame_address(0);
    }
#endif

#if INCLUDE_SSC_MARKS
    SSC_MARK_FORKING();
#endif
    __kmp_fork_call( loc, gtid, fork_context_intel,
            argc,
#if OMPT_SUPPORT
            VOLATILE_CAST(void *) microtask,      // "unwrapped" task
#endif
            VOLATILE_CAST(microtask_t) microtask, // "wrapped" task
            VOLATILE_CAST(launch_t)    __kmp_invoke_task_func,
/* TODO: revert workaround for Intel(R) 64 tracker #96 */
#if (KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64) && KMP_OS_LINUX
            &ap
#else
            ap
#endif
            );
#if INCLUDE_SSC_MARKS
    SSC_MARK_JOINING();
#endif
    __kmp_join_call( loc, gtid
#if OMPT_SUPPORT
        , fork_context_intel
#endif
    );

    va_end( ap );

#if OMPT_SUPPORT
    if (ompt_enabled) {
        parent_team->t.t_implicit_task_taskdata[tid].
            ompt_task_info.frame.reenter_runtime_frame = 0;
    }
#endif
  }
#if (KMP_STATS_ENABLED)  
  if (!inParallel)
      KMP_START_EXPLICIT_TIMER(OMP_serial);
#endif
}

#if OMP_40_ENABLED
/*!
@ingroup PARALLEL
@param loc source location information
@param global_tid global thread number
@param num_teams number of teams requested for the teams construct
@param num_threads number of threads per team requested for the teams construct

Set the number of teams to be used by the teams construct.
This call is only required if the teams construct has a `num_teams` clause
or a `thread_limit` clause (or both).
*/
void
__kmpc_push_num_teams(ident_t *loc, kmp_int32 global_tid, kmp_int32 num_teams, kmp_int32 num_threads )
{
    KA_TRACE( 20, ("__kmpc_push_num_teams: enter T#%d num_teams=%d num_threads=%d\n",
      global_tid, num_teams, num_threads ) );

    __kmp_push_num_teams( loc, global_tid, num_teams, num_threads );
}

/*!
@ingroup PARALLEL
@param loc  source location information
@param argc  total number of arguments in the ellipsis
@param microtask  pointer to callback routine consisting of outlined teams construct
@param ...  pointers to shared variables that aren't global

Do the actual fork and call the microtask in the relevant number of threads.
*/
void
__kmpc_fork_teams(ident_t *loc, kmp_int32 argc, kmpc_micro microtask, ...)
{
    int         gtid = __kmp_entry_gtid();
    kmp_info_t *this_thr = __kmp_threads[ gtid ];
    va_list     ap;
    va_start(   ap, microtask );

    KMP_COUNT_BLOCK(OMP_TEAMS);

    // remember teams entry point and nesting level
    this_thr->th.th_teams_microtask = microtask;
    this_thr->th.th_teams_level = this_thr->th.th_team->t.t_level; // AC: can be >0 on host

#if OMPT_SUPPORT
    kmp_team_t *parent_team = this_thr->th.th_team;
    int tid = __kmp_tid_from_gtid( gtid );
    if (ompt_enabled) {
        parent_team->t.t_implicit_task_taskdata[tid].
           ompt_task_info.frame.reenter_runtime_frame = __builtin_frame_address(0);
    }
#endif

    // check if __kmpc_push_num_teams called, set default number of teams otherwise
    if ( this_thr->th.th_teams_size.nteams == 0 ) {
        __kmp_push_num_teams( loc, gtid, 0, 0 );
    }
    KMP_DEBUG_ASSERT(this_thr->th.th_set_nproc >= 1);
    KMP_DEBUG_ASSERT(this_thr->th.th_teams_size.nteams >= 1);
    KMP_DEBUG_ASSERT(this_thr->th.th_teams_size.nth >= 1);

    __kmp_fork_call( loc, gtid, fork_context_intel,
            argc,
#if OMPT_SUPPORT
            VOLATILE_CAST(void *) microtask,               // "unwrapped" task
#endif
            VOLATILE_CAST(microtask_t) __kmp_teams_master, // "wrapped" task
            VOLATILE_CAST(launch_t)    __kmp_invoke_teams_master,
#if (KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64) && KMP_OS_LINUX
            &ap
#else
            ap
#endif
            );
    __kmp_join_call( loc, gtid
#if OMPT_SUPPORT
        , fork_context_intel
#endif
    );

#if OMPT_SUPPORT
    if (ompt_enabled) {
        parent_team->t.t_implicit_task_taskdata[tid].
           ompt_task_info.frame.reenter_runtime_frame = NULL;
    }
#endif

    this_thr->th.th_teams_microtask = NULL;
    this_thr->th.th_teams_level = 0;
    *(kmp_int64*)(&this_thr->th.th_teams_size) = 0L;
    va_end( ap );
}
#endif /* OMP_40_ENABLED */


//
// I don't think this function should ever have been exported.
// The __kmpc_ prefix was misapplied.  I'm fairly certain that no generated
// openmp code ever called it, but it's been exported from the RTL for so
// long that I'm afraid to remove the definition.
//
int
__kmpc_invoke_task_func( int gtid )
{
    return __kmp_invoke_task_func( gtid );
}

/*!
@ingroup PARALLEL
@param loc  source location information
@param global_tid  global thread number

Enter a serialized parallel construct. This interface is used to handle a
conditional parallel region, like this,
@code
#pragma omp parallel if (condition)
@endcode
when the condition is false.
*/
void
__kmpc_serialized_parallel(ident_t *loc, kmp_int32 global_tid)
{
    __kmp_serialized_parallel(loc, global_tid); /* The implementation is now in kmp_runtime.c so that it can share static functions with
                                                 * kmp_fork_call since the tasks to be done are similar in each case.
                                                 */
}

/*!
@ingroup PARALLEL
@param loc  source location information
@param global_tid  global thread number

Leave a serialized parallel construct.
*/
void
__kmpc_end_serialized_parallel(ident_t *loc, kmp_int32 global_tid)
{
    kmp_internal_control_t *top;
    kmp_info_t *this_thr;
    kmp_team_t *serial_team;

    KC_TRACE( 10, ("__kmpc_end_serialized_parallel: called by T#%d\n", global_tid ) );

    /* skip all this code for autopar serialized loops since it results in
       unacceptable overhead */
    if( loc != NULL && (loc->flags & KMP_IDENT_AUTOPAR ) )
        return;

    // Not autopar code
    if( ! TCR_4( __kmp_init_parallel ) )
        __kmp_parallel_initialize();

    this_thr    = __kmp_threads[ global_tid ];
    serial_team = this_thr->th.th_serial_team;

   #if OMP_41_ENABLED
   kmp_task_team_t *   task_team = this_thr->th.th_task_team;

   // we need to wait for the proxy tasks before finishing the thread
   if ( task_team != NULL && task_team->tt.tt_found_proxy_tasks )
        __kmp_task_team_wait(this_thr, serial_team, NULL ); // is an ITT object needed here?
   #endif

    KMP_MB();
    KMP_DEBUG_ASSERT( serial_team );
    KMP_ASSERT(       serial_team -> t.t_serialized );
    KMP_DEBUG_ASSERT( this_thr -> th.th_team == serial_team );
    KMP_DEBUG_ASSERT( serial_team != this_thr->th.th_root->r.r_root_team );
    KMP_DEBUG_ASSERT( serial_team -> t.t_threads );
    KMP_DEBUG_ASSERT( serial_team -> t.t_threads[0] == this_thr );

    /* If necessary, pop the internal control stack values and replace the team values */
    top = serial_team -> t.t_control_stack_top;
    if ( top && top -> serial_nesting_level == serial_team -> t.t_serialized ) {
        copy_icvs( &serial_team -> t.t_threads[0] -> th.th_current_task -> td_icvs, top );
        serial_team -> t.t_control_stack_top = top -> next;
        __kmp_free(top);
    }

    //if( serial_team -> t.t_serialized > 1 )
    serial_team -> t.t_level--;

    /* pop dispatch buffers stack */
    KMP_DEBUG_ASSERT(serial_team->t.t_dispatch->th_disp_buffer);
    {
        dispatch_private_info_t * disp_buffer = serial_team->t.t_dispatch->th_disp_buffer;
        serial_team->t.t_dispatch->th_disp_buffer =
            serial_team->t.t_dispatch->th_disp_buffer->next;
        __kmp_free( disp_buffer );
    }

    -- serial_team -> t.t_serialized;
    if ( serial_team -> t.t_serialized == 0 ) {

        /* return to the parallel section */

#if KMP_ARCH_X86 || KMP_ARCH_X86_64
        if ( __kmp_inherit_fp_control && serial_team->t.t_fp_control_saved ) {
            __kmp_clear_x87_fpu_status_word();
            __kmp_load_x87_fpu_control_word( &serial_team->t.t_x87_fpu_control_word );
            __kmp_load_mxcsr( &serial_team->t.t_mxcsr );
        }
#endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */

        this_thr -> th.th_team           = serial_team -> t.t_parent;
        this_thr -> th.th_info.ds.ds_tid = serial_team -> t.t_master_tid;

        /* restore values cached in the thread */
        this_thr -> th.th_team_nproc     = serial_team -> t.t_parent -> t.t_nproc;          /*  JPH */
        this_thr -> th.th_team_master    = serial_team -> t.t_parent -> t.t_threads[0];     /* JPH */
        this_thr -> th.th_team_serialized = this_thr -> th.th_team -> t.t_serialized;

        /* TODO the below shouldn't need to be adjusted for serialized teams */
        this_thr -> th.th_dispatch       = & this_thr -> th.th_team ->
            t.t_dispatch[ serial_team -> t.t_master_tid ];

        __kmp_pop_current_task_from_thread( this_thr );

        KMP_ASSERT( this_thr -> th.th_current_task -> td_flags.executing == 0 );
        this_thr -> th.th_current_task -> td_flags.executing = 1;

        if ( __kmp_tasking_mode != tskm_immediate_exec ) {
            // Copy the task team from the new child / old parent team to the thread.
            this_thr->th.th_task_team = this_thr->th.th_team->t.t_task_team[this_thr->th.th_task_state];
            KA_TRACE( 20, ( "__kmpc_end_serialized_parallel: T#%d restoring task_team %p / team %p\n",
                            global_tid, this_thr -> th.th_task_team, this_thr -> th.th_team ) );
        }
    } else {
        if ( __kmp_tasking_mode != tskm_immediate_exec ) {
            KA_TRACE( 20, ( "__kmpc_end_serialized_parallel: T#%d decreasing nesting depth of serial team %p to %d\n",
                            global_tid, serial_team, serial_team -> t.t_serialized ) );
        }
    }

#if USE_ITT_BUILD
    kmp_uint64 cur_time = 0;
#if  USE_ITT_NOTIFY
    if ( __itt_get_timestamp_ptr ) {
        cur_time = __itt_get_timestamp();
    }
#endif /* USE_ITT_NOTIFY */
    if ( this_thr->th.th_team->t.t_level == 0
#if OMP_40_ENABLED
        && this_thr->th.th_teams_microtask == NULL
#endif
    ) {
        // Report the barrier
        this_thr->th.th_ident = loc;
        if ( ( __itt_frame_submit_v3_ptr || KMP_ITT_DEBUG ) &&
            ( __kmp_forkjoin_frames_mode == 3 || __kmp_forkjoin_frames_mode == 1 ) )
        {
            __kmp_itt_frame_submit( global_tid, this_thr->th.th_frame_time_serialized,
                                    cur_time, 0, loc, this_thr->th.th_team_nproc, 0 );
            if ( __kmp_forkjoin_frames_mode == 3 )
                // Since barrier frame for serialized region is equal to the region we use the same begin timestamp as for the barrier.
                __kmp_itt_frame_submit( global_tid, serial_team->t.t_region_time,
                                        cur_time, 0, loc, this_thr->th.th_team_nproc, 2 );
        } else if ( ( __itt_frame_end_v3_ptr || KMP_ITT_DEBUG ) &&
            ! __kmp_forkjoin_frames_mode && __kmp_forkjoin_frames )
            // Mark the end of the "parallel" region for VTune. Only use one of frame notification scheme at the moment.
            __kmp_itt_region_joined( global_tid, 1 );
    }
#endif /* USE_ITT_BUILD */

    if ( __kmp_env_consistency_check )
        __kmp_pop_parallel( global_tid, NULL );
}

/*!
@ingroup SYNCHRONIZATION
@param loc  source location information.

Execute <tt>flush</tt>. This is implemented as a full memory fence. (Though
depending on the memory ordering convention obeyed by the compiler
even that may not be necessary).
*/
void
__kmpc_flush(ident_t *loc)
{
    KC_TRACE( 10, ("__kmpc_flush: called\n" ) );

    /* need explicit __mf() here since use volatile instead in library */
    KMP_MB();       /* Flush all pending memory write invalidates.  */

    #if ( KMP_ARCH_X86 || KMP_ARCH_X86_64 )
        #if KMP_MIC
            // fence-style instructions do not exist, but lock; xaddl $0,(%rsp) can be used.
            // We shouldn't need it, though, since the ABI rules require that
            // * If the compiler generates NGO stores it also generates the fence
            // * If users hand-code NGO stores they should insert the fence
            // therefore no incomplete unordered stores should be visible.
        #else
            // C74404
            // This is to address non-temporal store instructions (sfence needed).
            // The clflush instruction is addressed either (mfence needed).
            // Probably the non-temporal load monvtdqa instruction should also be addressed.
            // mfence is a SSE2 instruction. Do not execute it if CPU is not SSE2.
            if ( ! __kmp_cpuinfo.initialized ) {
                __kmp_query_cpuid( & __kmp_cpuinfo );
            }; // if
            if ( ! __kmp_cpuinfo.sse2 ) {
                // CPU cannot execute SSE2 instructions.
            } else {
                #if KMP_COMPILER_ICC || KMP_COMPILER_MSVC
                _mm_mfence();
                #else
                __sync_synchronize();
                #endif // KMP_COMPILER_ICC
            }; // if
        #endif // KMP_MIC
    #elif (KMP_ARCH_ARM || KMP_ARCH_AARCH64)
        // Nothing to see here move along
    #elif KMP_ARCH_PPC64
        // Nothing needed here (we have a real MB above).
        #if KMP_OS_CNK
        // The flushing thread needs to yield here; this prevents a
       // busy-waiting thread from saturating the pipeline. flush is
          // often used in loops like this:
           // while (!flag) {
           //   #pragma omp flush(flag)
           // }
       // and adding the yield here is good for at least a 10x speedup
          // when running >2 threads per core (on the NAS LU benchmark).
            __kmp_yield(TRUE);
        #endif
    #else
        #error Unknown or unsupported architecture
    #endif

}

/* -------------------------------------------------------------------------- */

/* -------------------------------------------------------------------------- */

/*!
@ingroup SYNCHRONIZATION
@param loc source location information
@param global_tid thread id.

Execute a barrier.
*/
void
__kmpc_barrier(ident_t *loc, kmp_int32 global_tid)
{
    KMP_COUNT_BLOCK(OMP_BARRIER);
    KMP_TIME_BLOCK(OMP_barrier);
    KC_TRACE( 10, ("__kmpc_barrier: called T#%d\n", global_tid ) );

    if (! TCR_4(__kmp_init_parallel))
        __kmp_parallel_initialize();

    if ( __kmp_env_consistency_check ) {
        if ( loc == 0 ) {
            KMP_WARNING( ConstructIdentInvalid ); // ??? What does it mean for the user?
        }; // if

        __kmp_check_barrier( global_tid, ct_barrier, loc );
    }

    __kmp_threads[ global_tid ]->th.th_ident = loc;
    // TODO: explicit barrier_wait_id:
    //   this function is called when 'barrier' directive is present or
    //   implicit barrier at the end of a worksharing construct.
    // 1) better to add a per-thread barrier counter to a thread data structure
    // 2) set to 0 when a new team is created
    // 4) no sync is required

    __kmp_barrier( bs_plain_barrier, global_tid, FALSE, 0, NULL, NULL );
}

/* The BARRIER for a MASTER section is always explicit   */
/*!
@ingroup WORK_SHARING
@param loc  source location information.
@param global_tid  global thread number .
@return 1 if this thread should execute the <tt>master</tt> block, 0 otherwise.
*/
kmp_int32
__kmpc_master(ident_t *loc, kmp_int32 global_tid)
{
    KMP_COUNT_BLOCK(OMP_MASTER);
    int status = 0;

    KC_TRACE( 10, ("__kmpc_master: called T#%d\n", global_tid ) );

    if( ! TCR_4( __kmp_init_parallel ) )
        __kmp_parallel_initialize();

    if( KMP_MASTER_GTID( global_tid )) {
        KMP_START_EXPLICIT_TIMER(OMP_master);
        status = 1;
    }

#if OMPT_SUPPORT && OMPT_TRACE
    if (status) {
        if (ompt_enabled &&
            ompt_callbacks.ompt_callback(ompt_event_master_begin)) {
            kmp_info_t  *this_thr        = __kmp_threads[ global_tid ];
            kmp_team_t  *team            = this_thr -> th.th_team;

            int  tid = __kmp_tid_from_gtid( global_tid );
            ompt_callbacks.ompt_callback(ompt_event_master_begin)(
                team->t.ompt_team_info.parallel_id,
                team->t.t_implicit_task_taskdata[tid].ompt_task_info.task_id);
        }
    }
#endif

    if ( __kmp_env_consistency_check ) {
#if KMP_USE_DYNAMIC_LOCK
        if (status)
            __kmp_push_sync( global_tid, ct_master, loc, NULL, 0 );
        else
            __kmp_check_sync( global_tid, ct_master, loc, NULL, 0 );
#else
        if (status)
            __kmp_push_sync( global_tid, ct_master, loc, NULL );
        else
            __kmp_check_sync( global_tid, ct_master, loc, NULL );
#endif
    }

    return status;
}

/*!
@ingroup WORK_SHARING
@param loc  source location information.
@param global_tid  global thread number .

Mark the end of a <tt>master</tt> region. This should only be called by the thread
that executes the <tt>master</tt> region.
*/
void
__kmpc_end_master(ident_t *loc, kmp_int32 global_tid)
{
    KC_TRACE( 10, ("__kmpc_end_master: called T#%d\n", global_tid ) );

    KMP_DEBUG_ASSERT( KMP_MASTER_GTID( global_tid ));
    KMP_STOP_EXPLICIT_TIMER(OMP_master);

#if OMPT_SUPPORT && OMPT_TRACE
    kmp_info_t  *this_thr        = __kmp_threads[ global_tid ];
    kmp_team_t  *team            = this_thr -> th.th_team;
    if (ompt_enabled &&
        ompt_callbacks.ompt_callback(ompt_event_master_end)) {
        int  tid = __kmp_tid_from_gtid( global_tid );
        ompt_callbacks.ompt_callback(ompt_event_master_end)(
            team->t.ompt_team_info.parallel_id,
            team->t.t_implicit_task_taskdata[tid].ompt_task_info.task_id);
    }
#endif

    if ( __kmp_env_consistency_check ) {
        if( global_tid < 0 )
            KMP_WARNING( ThreadIdentInvalid );

        if( KMP_MASTER_GTID( global_tid ))
            __kmp_pop_sync( global_tid, ct_master, loc );
    }
}

/*!
@ingroup WORK_SHARING
@param loc  source location information.
@param gtid  global thread number.

Start execution of an <tt>ordered</tt> construct.
*/
void
__kmpc_ordered( ident_t * loc, kmp_int32 gtid )
{
    int cid = 0;
    kmp_info_t *th;
    KMP_DEBUG_ASSERT( __kmp_init_serial );

    KC_TRACE( 10, ("__kmpc_ordered: called T#%d\n", gtid ));

    if (! TCR_4(__kmp_init_parallel))
        __kmp_parallel_initialize();

#if USE_ITT_BUILD
    __kmp_itt_ordered_prep( gtid );
    // TODO: ordered_wait_id
#endif /* USE_ITT_BUILD */

    th = __kmp_threads[ gtid ];

#if OMPT_SUPPORT && OMPT_TRACE
    if (ompt_enabled) {
        /* OMPT state update */
        th->th.ompt_thread_info.wait_id = (uint64_t) loc;
        th->th.ompt_thread_info.state = ompt_state_wait_ordered;

        /* OMPT event callback */
        if (ompt_callbacks.ompt_callback(ompt_event_wait_ordered)) {
            ompt_callbacks.ompt_callback(ompt_event_wait_ordered)(
                th->th.ompt_thread_info.wait_id);
        }
    }
#endif

    if ( th -> th.th_dispatch -> th_deo_fcn != 0 )
        (*th->th.th_dispatch->th_deo_fcn)( & gtid, & cid, loc );
    else
        __kmp_parallel_deo( & gtid, & cid, loc );

#if OMPT_SUPPORT && OMPT_TRACE
    if (ompt_enabled) {
        /* OMPT state update */
        th->th.ompt_thread_info.state = ompt_state_work_parallel;
        th->th.ompt_thread_info.wait_id = 0;

        /* OMPT event callback */
        if (ompt_callbacks.ompt_callback(ompt_event_acquired_ordered)) {
            ompt_callbacks.ompt_callback(ompt_event_acquired_ordered)(
                th->th.ompt_thread_info.wait_id);
        }
    }
#endif

#if USE_ITT_BUILD
    __kmp_itt_ordered_start( gtid );
#endif /* USE_ITT_BUILD */
}

/*!
@ingroup WORK_SHARING
@param loc  source location information.
@param gtid  global thread number.

End execution of an <tt>ordered</tt> construct.
*/
void
__kmpc_end_ordered( ident_t * loc, kmp_int32 gtid )
{
    int cid = 0;
    kmp_info_t *th;

    KC_TRACE( 10, ("__kmpc_end_ordered: called T#%d\n", gtid ) );

#if USE_ITT_BUILD
    __kmp_itt_ordered_end( gtid );
    // TODO: ordered_wait_id
#endif /* USE_ITT_BUILD */

    th = __kmp_threads[ gtid ];

    if ( th -> th.th_dispatch -> th_dxo_fcn != 0 )
        (*th->th.th_dispatch->th_dxo_fcn)( & gtid, & cid, loc );
    else
        __kmp_parallel_dxo( & gtid, & cid, loc );

#if OMPT_SUPPORT && OMPT_BLAME
    if (ompt_enabled &&
        ompt_callbacks.ompt_callback(ompt_event_release_ordered)) {
        ompt_callbacks.ompt_callback(ompt_event_release_ordered)(
            th->th.ompt_thread_info.wait_id);
    }
#endif
}

#if KMP_USE_DYNAMIC_LOCK

static __forceinline kmp_indirect_lock_t *
__kmp_get_indirect_csptr(kmp_critical_name * crit, ident_t const * loc, kmp_int32 gtid, kmp_dyna_lockseq_t seq)
{
    // Code from __kmp_get_critical_section_ptr
    // This function returns an indirect lock object instead of a user lock.
    kmp_indirect_lock_t **lck, *ret;
    lck = (kmp_indirect_lock_t **)crit;
    ret = (kmp_indirect_lock_t *)TCR_PTR(*lck);
    if (ret == NULL) {
        void *idx;
        kmp_indirect_locktag_t tag = DYNA_GET_I_TAG(seq);
        kmp_indirect_lock_t *ilk = __kmp_allocate_indirect_lock(&idx, gtid, tag);
        ret = ilk;
        DYNA_I_LOCK_FUNC(ilk, init)(ilk->lock);
        DYNA_SET_I_LOCK_LOCATION(ilk, loc);
        DYNA_SET_I_LOCK_FLAGS(ilk, kmp_lf_critical_section);
        KA_TRACE(20, ("__kmp_get_indirect_csptr: initialized indirect lock #%d\n", tag));
#if USE_ITT_BUILD
        __kmp_itt_critical_creating(ilk->lock, loc);
#endif
        int status = KMP_COMPARE_AND_STORE_PTR(lck, 0, ilk);
        if (status == 0) {
#if USE_ITT_BUILD
            __kmp_itt_critical_destroyed(ilk->lock);
#endif
            // Postponing destroy, to avoid costly dispatch here.
            //DYNA_D_LOCK_FUNC(&idx, destroy)((kmp_dyna_lock_t *)&idx);
            ret = (kmp_indirect_lock_t *)TCR_PTR(*lck);
            KMP_DEBUG_ASSERT(ret != NULL);
        }
    }
    return ret;
}

// Fast-path acquire tas lock
#define DYNA_ACQUIRE_TAS_LOCK(lock, gtid) {                                                                      \
    kmp_tas_lock_t *l = (kmp_tas_lock_t *)lock;                                                                  \
    if (l->lk.poll != DYNA_LOCK_FREE(tas) ||                                                                     \
            ! KMP_COMPARE_AND_STORE_ACQ32(&(l->lk.poll), DYNA_LOCK_FREE(tas), DYNA_LOCK_BUSY(gtid+1, tas))) {    \
        kmp_uint32 spins;                                                                                        \
        KMP_FSYNC_PREPARE(l);                                                                                    \
        KMP_INIT_YIELD(spins);                                                                                   \
        if (TCR_4(__kmp_nth) > (__kmp_avail_proc ? __kmp_avail_proc : __kmp_xproc)) {                            \
            KMP_YIELD(TRUE);                                                                                     \
        } else {                                                                                                 \
            KMP_YIELD_SPIN(spins);                                                                               \
        }                                                                                                        \
        while (l->lk.poll != DYNA_LOCK_FREE(tas) ||                                                              \
               ! KMP_COMPARE_AND_STORE_ACQ32(&(l->lk.poll), DYNA_LOCK_FREE(tas), DYNA_LOCK_BUSY(gtid+1, tas))) { \
            if (TCR_4(__kmp_nth) > (__kmp_avail_proc ? __kmp_avail_proc : __kmp_xproc)) {                        \
                KMP_YIELD(TRUE);                                                                                 \
            } else {                                                                                             \
                KMP_YIELD_SPIN(spins);                                                                           \
            }                                                                                                    \
        }                                                                                                        \
    }                                                                                                            \
    KMP_FSYNC_ACQUIRED(l);                                                                                       \
}

// Fast-path test tas lock
#define DYNA_TEST_TAS_LOCK(lock, gtid, rc) {                                                           \
    kmp_tas_lock_t *l = (kmp_tas_lock_t *)lock;                                                        \
    rc = l->lk.poll == DYNA_LOCK_FREE(tas) &&                                                          \
         KMP_COMPARE_AND_STORE_ACQ32(&(l->lk.poll), DYNA_LOCK_FREE(tas), DYNA_LOCK_BUSY(gtid+1, tas)); \
}

// Fast-path release tas lock
#define DYNA_RELEASE_TAS_LOCK(lock, gtid) {                         \
    TCW_4(((kmp_tas_lock_t *)lock)->lk.poll, DYNA_LOCK_FREE(tas));  \
    KMP_MB();                                                       \
}

#if DYNA_HAS_FUTEX

# include <unistd.h>
# include <sys/syscall.h>
# ifndef FUTEX_WAIT
#  define FUTEX_WAIT 0
# endif
# ifndef FUTEX_WAKE
#  define FUTEX_WAKE 1
# endif

// Fast-path acquire futex lock
#define DYNA_ACQUIRE_FUTEX_LOCK(lock, gtid) {                                                                       \
    kmp_futex_lock_t *ftx = (kmp_futex_lock_t *)lock;                                                               \
    kmp_int32 gtid_code = (gtid+1) << 1;                                                                            \
    KMP_MB();                                                                                                       \
    KMP_FSYNC_PREPARE(ftx);                                                                                         \
    kmp_int32 poll_val;                                                                                             \
    while ((poll_val = KMP_COMPARE_AND_STORE_RET32(&(ftx->lk.poll), DYNA_LOCK_FREE(futex),                          \
                                                   DYNA_LOCK_BUSY(gtid_code, futex))) != DYNA_LOCK_FREE(futex)) {   \
        kmp_int32 cond = DYNA_LOCK_STRIP(poll_val) & 1;                                                             \
        if (!cond) {                                                                                                \
            if (!KMP_COMPARE_AND_STORE_RET32(&(ftx->lk.poll), poll_val, poll_val | DYNA_LOCK_BUSY(1, futex))) {     \
                continue;                                                                                           \
            }                                                                                                       \
            poll_val |= DYNA_LOCK_BUSY(1, futex);                                                                   \
        }                                                                                                           \
        kmp_int32 rc;                                                                                               \
        if ((rc = syscall(__NR_futex, &(ftx->lk.poll), FUTEX_WAIT, poll_val, NULL, NULL, 0)) != 0) {                \
            continue;                                                                                               \
        }                                                                                                           \
        gtid_code |= 1;                                                                                             \
    }                                                                                                               \
    KMP_FSYNC_ACQUIRED(ftx);                                                                                        \
}

// Fast-path test futex lock
#define DYNA_TEST_FUTEX_LOCK(lock, gtid, rc) {                                                                      \
    kmp_futex_lock_t *ftx = (kmp_futex_lock_t *)lock;                                                               \
    if (KMP_COMPARE_AND_STORE_ACQ32(&(ftx->lk.poll), DYNA_LOCK_FREE(futex), DYNA_LOCK_BUSY(gtid+1, futex) << 1)) {  \
        KMP_FSYNC_ACQUIRED(ftx);                                                                                    \
        rc = TRUE;                                                                                                  \
    } else {                                                                                                        \
        rc = FALSE;                                                                                                 \
    }                                                                                                               \
}

// Fast-path release futex lock
#define DYNA_RELEASE_FUTEX_LOCK(lock, gtid) {                                                       \
    kmp_futex_lock_t *ftx = (kmp_futex_lock_t *)lock;                                               \
    KMP_MB();                                                                                       \
    KMP_FSYNC_RELEASING(ftx);                                                                       \
    kmp_int32 poll_val = KMP_XCHG_FIXED32(&(ftx->lk.poll), DYNA_LOCK_FREE(futex));                  \
    if (DYNA_LOCK_STRIP(poll_val) & 1) {                                                            \
        syscall(__NR_futex, &(ftx->lk.poll), FUTEX_WAKE, DYNA_LOCK_BUSY(1, futex), NULL, NULL, 0);  \
    }                                                                                               \
    KMP_MB();                                                                                       \
    KMP_YIELD(TCR_4(__kmp_nth) > (__kmp_avail_proc ? __kmp_avail_proc : __kmp_xproc));              \
}

#endif // DYNA_HAS_FUTEX

#else // KMP_USE_DYNAMIC_LOCK

static kmp_user_lock_p
__kmp_get_critical_section_ptr( kmp_critical_name * crit, ident_t const * loc, kmp_int32 gtid )
{
    kmp_user_lock_p *lck_pp = (kmp_user_lock_p *)crit;

    //
    // Because of the double-check, the following load
    // doesn't need to be volatile.
    //
    kmp_user_lock_p lck = (kmp_user_lock_p)TCR_PTR( *lck_pp );

    if ( lck == NULL ) {
        void * idx;

        // Allocate & initialize the lock.
        // Remember allocated locks in table in order to free them in __kmp_cleanup()
        lck = __kmp_user_lock_allocate( &idx, gtid, kmp_lf_critical_section );
        __kmp_init_user_lock_with_checks( lck );
        __kmp_set_user_lock_location( lck, loc );
#if USE_ITT_BUILD
        __kmp_itt_critical_creating( lck );
            // __kmp_itt_critical_creating() should be called *before* the first usage of underlying
            // lock. It is the only place where we can guarantee it. There are chances the lock will
            // destroyed with no usage, but it is not a problem, because this is not real event seen
            // by user but rather setting name for object (lock). See more details in kmp_itt.h.
#endif /* USE_ITT_BUILD */

        //
        // Use a cmpxchg instruction to slam the start of the critical
        // section with the lock pointer.  If another thread beat us
        // to it, deallocate the lock, and use the lock that the other
        // thread allocated.
        //
        int status = KMP_COMPARE_AND_STORE_PTR( lck_pp, 0, lck );

        if ( status == 0 ) {
            // Deallocate the lock and reload the value.
#if USE_ITT_BUILD
            __kmp_itt_critical_destroyed( lck );
                // Let ITT know the lock is destroyed and the same memory location may be reused for
                // another purpose.
#endif /* USE_ITT_BUILD */
            __kmp_destroy_user_lock_with_checks( lck );
            __kmp_user_lock_free( &idx, gtid, lck );
            lck = (kmp_user_lock_p)TCR_PTR( *lck_pp );
            KMP_DEBUG_ASSERT( lck != NULL );
        }
    }
    return lck;
}

#endif // KMP_USE_DYNAMIC_LOCK

/*!
@ingroup WORK_SHARING
@param loc  source location information.
@param global_tid  global thread number .
@param crit identity of the critical section. This could be a pointer to a lock associated with the critical section, or
some other suitably unique value.

Enter code protected by a `critical` construct.
This function blocks until the executing thread can enter the critical section.
*/
void
__kmpc_critical( ident_t * loc, kmp_int32 global_tid, kmp_critical_name * crit ) {
    KMP_COUNT_BLOCK(OMP_CRITICAL);

    kmp_user_lock_p lck;

    KC_TRACE( 10, ("__kmpc_critical: called T#%d\n", global_tid ) );

#if KMP_USE_DYNAMIC_LOCK
    // Assumption: all direct locks fit in OMP_CRITICAL_SIZE.
    // The global sequence __kmp_user_lock_seq is used unless compiler pushes a value.
    if (DYNA_IS_D_LOCK(__kmp_user_lock_seq)) {
        lck = (kmp_user_lock_p)crit;
        // The thread that reaches here first needs to tag the lock word.
        if (*((kmp_dyna_lock_t *)lck) == 0) {
            KMP_COMPARE_AND_STORE_ACQ32((volatile kmp_int32 *)lck, 0, DYNA_GET_D_TAG(__kmp_user_lock_seq));
        }
        if (__kmp_env_consistency_check) {
            __kmp_push_sync(global_tid, ct_critical, loc, lck, __kmp_user_lock_seq);
        }
# if USE_ITT_BUILD
        __kmp_itt_critical_acquiring(lck);
# endif
# if DYNA_USE_FAST_TAS
        if (__kmp_user_lock_seq == lockseq_tas && !__kmp_env_consistency_check) {
            DYNA_ACQUIRE_TAS_LOCK(lck, global_tid);
        } else
# elif DYNA_USE_FAST_FUTEX
        if (__kmp_user_lock_seq == lockseq_futex && !__kmp_env_consistency_check) {
            DYNA_ACQUIRE_FUTEX_LOCK(lck, global_tid);
        } else
# endif
        {
            DYNA_D_LOCK_FUNC(lck, set)((kmp_dyna_lock_t *)lck, global_tid);
        }
    } else {
        kmp_indirect_lock_t *ilk = __kmp_get_indirect_csptr(crit, loc, global_tid, __kmp_user_lock_seq);
        lck = ilk->lock;
        if (__kmp_env_consistency_check) {
            __kmp_push_sync(global_tid, ct_critical, loc, lck, __kmp_user_lock_seq);
        }
# if USE_ITT_BUILD
        __kmp_itt_critical_acquiring(lck);
# endif
        DYNA_I_LOCK_FUNC(ilk, set)(lck, global_tid);
    }

#else // KMP_USE_DYNAMIC_LOCK

    //TODO: add THR_OVHD_STATE

    KMP_CHECK_USER_LOCK_INIT();

    if ( ( __kmp_user_lock_kind == lk_tas )
      && ( sizeof( lck->tas.lk.poll ) <= OMP_CRITICAL_SIZE ) ) {
        lck = (kmp_user_lock_p)crit;
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
      && ( sizeof( lck->futex.lk.poll ) <= OMP_CRITICAL_SIZE ) ) {
        lck = (kmp_user_lock_p)crit;
    }
#endif
    else { // ticket, queuing or drdpa
        lck = __kmp_get_critical_section_ptr( crit, loc, global_tid );
    }

    if ( __kmp_env_consistency_check )
        __kmp_push_sync( global_tid, ct_critical, loc, lck );

    /* since the critical directive binds to all threads, not just
     * the current team we have to check this even if we are in a
     * serialized team */
    /* also, even if we are the uber thread, we still have to conduct the lock,
     * as we have to contend with sibling threads */

#if USE_ITT_BUILD
    __kmp_itt_critical_acquiring( lck );
#endif /* USE_ITT_BUILD */
    // Value of 'crit' should be good for using as a critical_id of the critical section directive.
    __kmp_acquire_user_lock_with_checks( lck, global_tid );

#endif // KMP_USE_DYNAMIC_LOCK

#if USE_ITT_BUILD
    __kmp_itt_critical_acquired( lck );
#endif /* USE_ITT_BUILD */

    KA_TRACE( 15, ("__kmpc_critical: done T#%d\n", global_tid ));
} // __kmpc_critical

/*!
@ingroup WORK_SHARING
@param loc  source location information.
@param global_tid  global thread number .
@param crit identity of the critical section. This could be a pointer to a lock associated with the critical section, or
some other suitably unique value.

Leave a critical section, releasing any lock that was held during its execution.
*/
void
__kmpc_end_critical(ident_t *loc, kmp_int32 global_tid, kmp_critical_name *crit)
{
    kmp_user_lock_p lck;

    KC_TRACE( 10, ("__kmpc_end_critical: called T#%d\n", global_tid ));

#if KMP_USE_DYNAMIC_LOCK
    if (DYNA_IS_D_LOCK(__kmp_user_lock_seq)) {
        lck = (kmp_user_lock_p)crit;
        KMP_ASSERT(lck != NULL);
        if (__kmp_env_consistency_check) {
            __kmp_pop_sync(global_tid, ct_critical, loc);
        }
# if USE_ITT_BUILD
        __kmp_itt_critical_releasing( lck );
# endif
# if DYNA_USE_FAST_TAS
        if (__kmp_user_lock_seq == lockseq_tas && !__kmp_env_consistency_check) {
            DYNA_RELEASE_TAS_LOCK(lck, global_tid);
        } else
# elif DYNA_USE_FAST_FUTEX
        if (__kmp_user_lock_seq == lockseq_futex && !__kmp_env_consistency_check) {
            DYNA_RELEASE_FUTEX_LOCK(lck, global_tid);
        } else
# endif
        {
            DYNA_D_LOCK_FUNC(lck, unset)((kmp_dyna_lock_t *)lck, global_tid);
        }
    } else {
        kmp_indirect_lock_t *ilk = (kmp_indirect_lock_t *)TCR_PTR(*((kmp_indirect_lock_t **)crit));
        KMP_ASSERT(ilk != NULL);
        lck = ilk->lock;
        if (__kmp_env_consistency_check) {
            __kmp_pop_sync(global_tid, ct_critical, loc);
        }
# if USE_ITT_BUILD
        __kmp_itt_critical_releasing( lck );
# endif
        DYNA_I_LOCK_FUNC(ilk, unset)(lck, global_tid);
    }

#else // KMP_USE_DYNAMIC_LOCK

    if ( ( __kmp_user_lock_kind == lk_tas )
      && ( sizeof( lck->tas.lk.poll ) <= OMP_CRITICAL_SIZE ) ) {
        lck = (kmp_user_lock_p)crit;
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
      && ( sizeof( lck->futex.lk.poll ) <= OMP_CRITICAL_SIZE ) ) {
        lck = (kmp_user_lock_p)crit;
    }
#endif
    else { // ticket, queuing or drdpa
        lck = (kmp_user_lock_p) TCR_PTR(*((kmp_user_lock_p *)crit));
    }

    KMP_ASSERT(lck != NULL);

    if ( __kmp_env_consistency_check )
        __kmp_pop_sync( global_tid, ct_critical, loc );

#if USE_ITT_BUILD
    __kmp_itt_critical_releasing( lck );
#endif /* USE_ITT_BUILD */
    // Value of 'crit' should be good for using as a critical_id of the critical section directive.
    __kmp_release_user_lock_with_checks( lck, global_tid );

#if OMPT_SUPPORT && OMPT_BLAME
    if (ompt_enabled &&
        ompt_callbacks.ompt_callback(ompt_event_release_critical)) {
        ompt_callbacks.ompt_callback(ompt_event_release_critical)(
            (uint64_t) lck);
    }
#endif

#endif // KMP_USE_DYNAMIC_LOCK

    KA_TRACE( 15, ("__kmpc_end_critical: done T#%d\n", global_tid ));
}

/*!
@ingroup SYNCHRONIZATION
@param loc source location information
@param global_tid thread id.
@return one if the thread should execute the master block, zero otherwise

Start execution of a combined barrier and master. The barrier is executed inside this function.
*/
kmp_int32
__kmpc_barrier_master(ident_t *loc, kmp_int32 global_tid)
{
    int status;

    KC_TRACE( 10, ("__kmpc_barrier_master: called T#%d\n", global_tid ) );

    if (! TCR_4(__kmp_init_parallel))
        __kmp_parallel_initialize();

    if ( __kmp_env_consistency_check )
        __kmp_check_barrier( global_tid, ct_barrier, loc );

#if USE_ITT_NOTIFY
    __kmp_threads[global_tid]->th.th_ident = loc;
#endif
    status = __kmp_barrier( bs_plain_barrier, global_tid, TRUE, 0, NULL, NULL );

    return (status != 0) ? 0 : 1;
}

/*!
@ingroup SYNCHRONIZATION
@param loc source location information
@param global_tid thread id.

Complete the execution of a combined barrier and master. This function should
only be called at the completion of the <tt>master</tt> code. Other threads will
still be waiting at the barrier and this call releases them.
*/
void
__kmpc_end_barrier_master(ident_t *loc, kmp_int32 global_tid)
{
    KC_TRACE( 10, ("__kmpc_end_barrier_master: called T#%d\n", global_tid ));

    __kmp_end_split_barrier ( bs_plain_barrier, global_tid );
}

/*!
@ingroup SYNCHRONIZATION
@param loc source location information
@param global_tid thread id.
@return one if the thread should execute the master block, zero otherwise

Start execution of a combined barrier and master(nowait) construct.
The barrier is executed inside this function.
There is no equivalent "end" function, since the
*/
kmp_int32
__kmpc_barrier_master_nowait( ident_t * loc, kmp_int32 global_tid )
{
    kmp_int32 ret;

    KC_TRACE( 10, ("__kmpc_barrier_master_nowait: called T#%d\n", global_tid ));

    if (! TCR_4(__kmp_init_parallel))
        __kmp_parallel_initialize();

    if ( __kmp_env_consistency_check ) {
        if ( loc == 0 ) {
            KMP_WARNING( ConstructIdentInvalid ); // ??? What does it mean for the user?
        }
        __kmp_check_barrier( global_tid, ct_barrier, loc );
    }

#if USE_ITT_NOTIFY
    __kmp_threads[global_tid]->th.th_ident = loc;
#endif
    __kmp_barrier( bs_plain_barrier, global_tid, FALSE, 0, NULL, NULL );

    ret = __kmpc_master (loc, global_tid);

    if ( __kmp_env_consistency_check ) {
        /*  there's no __kmpc_end_master called; so the (stats) */
        /*  actions of __kmpc_end_master are done here          */

        if ( global_tid < 0 ) {
            KMP_WARNING( ThreadIdentInvalid );
        }
        if (ret) {
            /* only one thread should do the pop since only */
            /* one did the push (see __kmpc_master())       */

            __kmp_pop_sync( global_tid, ct_master, loc );
        }
    }

    return (ret);
}

/* The BARRIER for a SINGLE process section is always explicit   */
/*!
@ingroup WORK_SHARING
@param loc  source location information
@param global_tid  global thread number
@return One if this thread should execute the single construct, zero otherwise.

Test whether to execute a <tt>single</tt> construct.
There are no implicit barriers in the two "single" calls, rather the compiler should
introduce an explicit barrier if it is required.
*/

kmp_int32
__kmpc_single(ident_t *loc, kmp_int32 global_tid)
{
    KMP_COUNT_BLOCK(OMP_SINGLE);
    kmp_int32 rc = __kmp_enter_single( global_tid, loc, TRUE );
    if(rc == TRUE) {
        KMP_START_EXPLICIT_TIMER(OMP_single);
    }

#if OMPT_SUPPORT && OMPT_TRACE
    kmp_info_t *this_thr        = __kmp_threads[ global_tid ];
    kmp_team_t *team            = this_thr -> th.th_team;
    int tid = __kmp_tid_from_gtid( global_tid );

    if (ompt_enabled) {
        if (rc) {
            if (ompt_callbacks.ompt_callback(ompt_event_single_in_block_begin)) {
                ompt_callbacks.ompt_callback(ompt_event_single_in_block_begin)(
                    team->t.ompt_team_info.parallel_id,
                    team->t.t_implicit_task_taskdata[tid].ompt_task_info.task_id,
                    team->t.ompt_team_info.microtask);
            }
        } else {
            if (ompt_callbacks.ompt_callback(ompt_event_single_others_begin)) {
                ompt_callbacks.ompt_callback(ompt_event_single_others_begin)(
                    team->t.ompt_team_info.parallel_id,
                    team->t.t_implicit_task_taskdata[tid].ompt_task_info.task_id);
            }
            this_thr->th.ompt_thread_info.state = ompt_state_wait_single;
        }
    }
#endif

    return rc;
}

/*!
@ingroup WORK_SHARING
@param loc  source location information
@param global_tid  global thread number

Mark the end of a <tt>single</tt> construct.  This function should
only be called by the thread that executed the block of code protected
by the `single` construct.
*/
void
__kmpc_end_single(ident_t *loc, kmp_int32 global_tid)
{
    __kmp_exit_single( global_tid );
    KMP_STOP_EXPLICIT_TIMER(OMP_single);

#if OMPT_SUPPORT && OMPT_TRACE
    kmp_info_t *this_thr        = __kmp_threads[ global_tid ];
    kmp_team_t *team            = this_thr -> th.th_team;
    int tid = __kmp_tid_from_gtid( global_tid );

    if (ompt_enabled &&
        ompt_callbacks.ompt_callback(ompt_event_single_in_block_end)) {
        ompt_callbacks.ompt_callback(ompt_event_single_in_block_end)(
            team->t.ompt_team_info.parallel_id,
            team->t.t_implicit_task_taskdata[tid].ompt_task_info.task_id);
    }
#endif
}

/*!
@ingroup WORK_SHARING
@param loc Source location
@param global_tid Global thread id

Mark the end of a statically scheduled loop.
*/
void
__kmpc_for_static_fini( ident_t *loc, kmp_int32 global_tid )
{
    KE_TRACE( 10, ("__kmpc_for_static_fini called T#%d\n", global_tid));

#if OMPT_SUPPORT && OMPT_TRACE
    kmp_info_t *this_thr        = __kmp_threads[ global_tid ];
    kmp_team_t *team            = this_thr -> th.th_team;
    int tid = __kmp_tid_from_gtid( global_tid );

    if (ompt_enabled &&
        ompt_callbacks.ompt_callback(ompt_event_loop_end)) {
        ompt_callbacks.ompt_callback(ompt_event_loop_end)(
            team->t.ompt_team_info.parallel_id,
            team->t.t_implicit_task_taskdata[tid].ompt_task_info.task_id);
    }
#endif

    if ( __kmp_env_consistency_check )
     __kmp_pop_workshare( global_tid, ct_pdo, loc );
}

/*
 * User routines which take C-style arguments (call by value)
 * different from the Fortran equivalent routines
 */

void
ompc_set_num_threads( int arg )
{
// !!!!! TODO: check the per-task binding
    __kmp_set_num_threads( arg, __kmp_entry_gtid() );
}

void
ompc_set_dynamic( int flag )
{
    kmp_info_t *thread;

    /* For the thread-private implementation of the internal controls */
    thread = __kmp_entry_thread();

    __kmp_save_internal_controls( thread );

    set__dynamic( thread, flag ? TRUE : FALSE );
}

void
ompc_set_nested( int flag )
{
    kmp_info_t *thread;

    /* For the thread-private internal controls implementation */
    thread = __kmp_entry_thread();

    __kmp_save_internal_controls( thread );

    set__nested( thread, flag ? TRUE : FALSE );
}

void
ompc_set_max_active_levels( int max_active_levels )
{
    /* TO DO */
    /* we want per-task implementation of this internal control */

    /* For the per-thread internal controls implementation */
    __kmp_set_max_active_levels( __kmp_entry_gtid(), max_active_levels );
}

void
ompc_set_schedule( omp_sched_t kind, int modifier )
{
// !!!!! TODO: check the per-task binding
    __kmp_set_schedule( __kmp_entry_gtid(), ( kmp_sched_t ) kind, modifier );
}

int
ompc_get_ancestor_thread_num( int level )
{
    return __kmp_get_ancestor_thread_num( __kmp_entry_gtid(), level );
}

int
ompc_get_team_size( int level )
{
    return __kmp_get_team_size( __kmp_entry_gtid(), level );
}

void
kmpc_set_stacksize( int arg )
{
    // __kmp_aux_set_stacksize initializes the library if needed
    __kmp_aux_set_stacksize( arg );
}

void
kmpc_set_stacksize_s( size_t arg )
{
    // __kmp_aux_set_stacksize initializes the library if needed
    __kmp_aux_set_stacksize( arg );
}

void
kmpc_set_blocktime( int arg )
{
    int gtid, tid;
    kmp_info_t *thread;

    gtid = __kmp_entry_gtid();
    tid = __kmp_tid_from_gtid(gtid);
    thread = __kmp_thread_from_gtid(gtid);

    __kmp_aux_set_blocktime( arg, thread, tid );
}

void
kmpc_set_library( int arg )
{
    // __kmp_user_set_library initializes the library if needed
    __kmp_user_set_library( (enum library_type)arg );
}

void
kmpc_set_defaults( char const * str )
{
    // __kmp_aux_set_defaults initializes the library if needed
    __kmp_aux_set_defaults( str, KMP_STRLEN( str ) );
}

int
kmpc_set_affinity_mask_proc( int proc, void **mask )
{
#if defined(KMP_STUB) || !KMP_AFFINITY_SUPPORTED
    return -1;
#else
    if ( ! TCR_4(__kmp_init_middle) ) {
        __kmp_middle_initialize();
    }
    return __kmp_aux_set_affinity_mask_proc( proc, mask );
#endif
}

int
kmpc_unset_affinity_mask_proc( int proc, void **mask )
{
#if defined(KMP_STUB) || !KMP_AFFINITY_SUPPORTED
    return -1;
#else
    if ( ! TCR_4(__kmp_init_middle) ) {
        __kmp_middle_initialize();
    }
    return __kmp_aux_unset_affinity_mask_proc( proc, mask );
#endif
}

int
kmpc_get_affinity_mask_proc( int proc, void **mask )
{
#if defined(KMP_STUB) || !KMP_AFFINITY_SUPPORTED
    return -1;
#else
    if ( ! TCR_4(__kmp_init_middle) ) {
        __kmp_middle_initialize();
    }
    return __kmp_aux_get_affinity_mask_proc( proc, mask );
#endif
}


/* -------------------------------------------------------------------------- */
/*!
@ingroup THREADPRIVATE
@param loc       source location information
@param gtid      global thread number
@param cpy_size  size of the cpy_data buffer
@param cpy_data  pointer to data to be copied
@param cpy_func  helper function to call for copying data
@param didit     flag variable: 1=single thread; 0=not single thread

__kmpc_copyprivate implements the interface for the private data broadcast needed for
the copyprivate clause associated with a single region in an OpenMP<sup>*</sup> program (both C and Fortran).
All threads participating in the parallel region call this routine.
One of the threads (called the single thread) should have the <tt>didit</tt> variable set to 1
and all other threads should have that variable set to 0.
All threads pass a pointer to a data buffer (cpy_data) that they have built.

The OpenMP specification forbids the use of nowait on the single region when a copyprivate
clause is present. However, @ref __kmpc_copyprivate implements a barrier internally to avoid
race conditions, so the code generation for the single region should avoid generating a barrier
after the call to @ref __kmpc_copyprivate.

The <tt>gtid</tt> parameter is the global thread id for the current thread.
The <tt>loc</tt> parameter is a pointer to source location information.

Internal implementation: The single thread will first copy its descriptor address (cpy_data)
to a team-private location, then the other threads will each call the function pointed to by
the parameter cpy_func, which carries out the copy by copying the data using the cpy_data buffer.

The cpy_func routine used for the copy and the contents of the data area defined by cpy_data
and cpy_size may be built in any fashion that will allow the copy to be done. For instance,
the cpy_data buffer can hold the actual data to be copied or it may hold a list of pointers
to the data. The cpy_func routine must interpret the cpy_data buffer appropriately.

The interface to cpy_func is as follows:
@code
void cpy_func( void *destination, void *source )
@endcode
where void *destination is the cpy_data pointer for the thread being copied to
and void *source is the cpy_data pointer for the thread being copied from.
*/
void
__kmpc_copyprivate( ident_t *loc, kmp_int32 gtid, size_t cpy_size, void *cpy_data, void(*cpy_func)(void*,void*), kmp_int32 didit )
{
    void **data_ptr;

    KC_TRACE( 10, ("__kmpc_copyprivate: called T#%d\n", gtid ));

    KMP_MB();

    data_ptr = & __kmp_team_from_gtid( gtid )->t.t_copypriv_data;

    if ( __kmp_env_consistency_check ) {
        if ( loc == 0 ) {
            KMP_WARNING( ConstructIdentInvalid );
        }
    }

    /* ToDo: Optimize the following two barriers into some kind of split barrier */

    if (didit) *data_ptr = cpy_data;

    /* This barrier is not a barrier region boundary */
#if USE_ITT_NOTIFY
    __kmp_threads[gtid]->th.th_ident = loc;
#endif
    __kmp_barrier( bs_plain_barrier, gtid, FALSE , 0, NULL, NULL );

    if (! didit) (*cpy_func)( cpy_data, *data_ptr );

    /* Consider next barrier the user-visible barrier for barrier region boundaries */
    /* Nesting checks are already handled by the single construct checks */

#if USE_ITT_NOTIFY
    __kmp_threads[gtid]->th.th_ident = loc; // TODO: check if it is needed (e.g. tasks can overwrite the location)
#endif
    __kmp_barrier( bs_plain_barrier, gtid, FALSE , 0, NULL, NULL );
}

/* -------------------------------------------------------------------------- */

#define INIT_LOCK                 __kmp_init_user_lock_with_checks
#define INIT_NESTED_LOCK          __kmp_init_nested_user_lock_with_checks
#define ACQUIRE_LOCK              __kmp_acquire_user_lock_with_checks
#define ACQUIRE_LOCK_TIMED        __kmp_acquire_user_lock_with_checks_timed
#define ACQUIRE_NESTED_LOCK       __kmp_acquire_nested_user_lock_with_checks
#define ACQUIRE_NESTED_LOCK_TIMED __kmp_acquire_nested_user_lock_with_checks_timed
#define RELEASE_LOCK              __kmp_release_user_lock_with_checks
#define RELEASE_NESTED_LOCK       __kmp_release_nested_user_lock_with_checks
#define TEST_LOCK                 __kmp_test_user_lock_with_checks
#define TEST_NESTED_LOCK          __kmp_test_nested_user_lock_with_checks
#define DESTROY_LOCK              __kmp_destroy_user_lock_with_checks
#define DESTROY_NESTED_LOCK       __kmp_destroy_nested_user_lock_with_checks


/*
 * TODO: Make check abort messages use location info & pass it
 * into with_checks routines
 */

/* initialize the lock */
void
__kmpc_init_lock( ident_t * loc, kmp_int32 gtid,  void ** user_lock ) {
#if KMP_USE_DYNAMIC_LOCK
    KMP_DEBUG_ASSERT(__kmp_init_serial);
    if (__kmp_env_consistency_check && user_lock == NULL) {
        KMP_FATAL(LockIsUninitialized, "omp_init_lock");
    }
    if (DYNA_IS_D_LOCK(__kmp_user_lock_seq)) {
        DYNA_INIT_D_LOCK(user_lock, __kmp_user_lock_seq);
# if USE_ITT_BUILD
        __kmp_itt_lock_creating((kmp_user_lock_p)user_lock, NULL);
# endif
    } else {
        DYNA_INIT_I_LOCK(user_lock, __kmp_user_lock_seq);
        kmp_indirect_lock_t *ilk = DYNA_LOOKUP_I_LOCK(user_lock);
        DYNA_SET_I_LOCK_LOCATION(ilk, loc);
# if USE_ITT_BUILD
        __kmp_itt_lock_creating(ilk->lock, loc);
# endif
    }

#else // KMP_USE_DYNAMIC_LOCK

    static char const * const func = "omp_init_lock";
    kmp_user_lock_p lck;
    KMP_DEBUG_ASSERT( __kmp_init_serial );

    if ( __kmp_env_consistency_check ) {
        if ( user_lock == NULL ) {
            KMP_FATAL( LockIsUninitialized, func );
        }
    }

    KMP_CHECK_USER_LOCK_INIT();

    if ( ( __kmp_user_lock_kind == lk_tas )
      && ( sizeof( lck->tas.lk.poll ) <= OMP_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
      && ( sizeof( lck->futex.lk.poll ) <= OMP_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#endif
    else {
        lck = __kmp_user_lock_allocate( user_lock, gtid, 0 );
    }
    INIT_LOCK( lck );
    __kmp_set_user_lock_location( lck, loc );

#if USE_ITT_BUILD
    __kmp_itt_lock_creating( lck );
#endif /* USE_ITT_BUILD */

#endif // KMP_USE_DYNAMIC_LOCK
} // __kmpc_init_lock

/* initialize the lock */
void
__kmpc_init_nest_lock( ident_t * loc, kmp_int32 gtid, void ** user_lock ) {
#if KMP_USE_DYNAMIC_LOCK

    KMP_DEBUG_ASSERT(__kmp_init_serial);
    if (__kmp_env_consistency_check && user_lock == NULL) {
        KMP_FATAL(LockIsUninitialized, "omp_init_nest_lock");
    }
    // Invoke init function after converting to nested version.
    kmp_dyna_lockseq_t nested_seq;
    switch (__kmp_user_lock_seq) {
        case lockseq_tas:       nested_seq = lockseq_nested_tas;        break;
#if DYNA_HAS_FUTEX
        case lockseq_futex:     nested_seq = lockseq_nested_futex;      break;
#endif
        case lockseq_ticket:    nested_seq = lockseq_nested_ticket;     break;
        case lockseq_queuing:   nested_seq = lockseq_nested_queuing;    break;
        case lockseq_drdpa:     nested_seq = lockseq_nested_drdpa;      break;
        default:                nested_seq = lockseq_nested_queuing;    break;
                                // Use nested queuing lock for lock kinds without "nested" implementation.
    }
    DYNA_INIT_I_LOCK(user_lock, nested_seq);
    // All nested locks are indirect locks.
    kmp_indirect_lock_t *ilk = DYNA_LOOKUP_I_LOCK(user_lock);
    DYNA_SET_I_LOCK_LOCATION(ilk, loc);
# if USE_ITT_BUILD
    __kmp_itt_lock_creating(ilk->lock, loc);
# endif

#else // KMP_USE_DYNAMIC_LOCK

    static char const * const func = "omp_init_nest_lock";
    kmp_user_lock_p lck;
    KMP_DEBUG_ASSERT( __kmp_init_serial );

    if ( __kmp_env_consistency_check ) {
        if ( user_lock == NULL ) {
            KMP_FATAL( LockIsUninitialized, func );
        }
    }

    KMP_CHECK_USER_LOCK_INIT();

    if ( ( __kmp_user_lock_kind == lk_tas ) && ( sizeof( lck->tas.lk.poll )
      + sizeof( lck->tas.lk.depth_locked ) <= OMP_NEST_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
     && ( sizeof( lck->futex.lk.poll ) + sizeof( lck->futex.lk.depth_locked )
     <= OMP_NEST_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#endif
    else {
        lck = __kmp_user_lock_allocate( user_lock, gtid, 0 );
    }

    INIT_NESTED_LOCK( lck );
    __kmp_set_user_lock_location( lck, loc );

#if USE_ITT_BUILD
    __kmp_itt_lock_creating( lck );
#endif /* USE_ITT_BUILD */

#endif // KMP_USE_DYNAMIC_LOCK
} // __kmpc_init_nest_lock

void
__kmpc_destroy_lock( ident_t * loc, kmp_int32 gtid, void ** user_lock ) {
#if KMP_USE_DYNAMIC_LOCK

# if USE_ITT_BUILD
    kmp_user_lock_p lck;
    if (DYNA_EXTRACT_D_TAG(user_lock) == 0) {
        lck = ((kmp_indirect_lock_t *)DYNA_LOOKUP_I_LOCK(user_lock))->lock;
    } else {
        lck = (kmp_user_lock_p)user_lock;
    }
    __kmp_itt_lock_destroyed(lck);
# endif
    DYNA_D_LOCK_FUNC(user_lock, destroy)((kmp_dyna_lock_t *)user_lock);
#else
    kmp_user_lock_p lck;

    if ( ( __kmp_user_lock_kind == lk_tas )
      && ( sizeof( lck->tas.lk.poll ) <= OMP_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
      && ( sizeof( lck->futex.lk.poll ) <= OMP_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#endif
    else {
        lck = __kmp_lookup_user_lock( user_lock, "omp_destroy_lock" );
    }

#if USE_ITT_BUILD
    __kmp_itt_lock_destroyed( lck );
#endif /* USE_ITT_BUILD */
    DESTROY_LOCK( lck );

    if ( ( __kmp_user_lock_kind == lk_tas )
      && ( sizeof( lck->tas.lk.poll ) <= OMP_LOCK_T_SIZE ) ) {
        ;
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
      && ( sizeof( lck->futex.lk.poll ) <= OMP_LOCK_T_SIZE ) ) {
        ;
    }
#endif
    else {
        __kmp_user_lock_free( user_lock, gtid, lck );
    }
#endif // KMP_USE_DYNAMIC_LOCK
} // __kmpc_destroy_lock

/* destroy the lock */
void
__kmpc_destroy_nest_lock( ident_t * loc, kmp_int32 gtid, void ** user_lock ) {
#if KMP_USE_DYNAMIC_LOCK

# if USE_ITT_BUILD
    kmp_indirect_lock_t *ilk = DYNA_LOOKUP_I_LOCK(user_lock);
    __kmp_itt_lock_destroyed(ilk->lock);
# endif
    DYNA_D_LOCK_FUNC(user_lock, destroy)((kmp_dyna_lock_t *)user_lock);

#else // KMP_USE_DYNAMIC_LOCK

    kmp_user_lock_p lck;

    if ( ( __kmp_user_lock_kind == lk_tas ) && ( sizeof( lck->tas.lk.poll )
      + sizeof( lck->tas.lk.depth_locked ) <= OMP_NEST_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
     && ( sizeof( lck->futex.lk.poll ) + sizeof( lck->futex.lk.depth_locked )
     <= OMP_NEST_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#endif
    else {
        lck = __kmp_lookup_user_lock( user_lock, "omp_destroy_nest_lock" );
    }

#if USE_ITT_BUILD
    __kmp_itt_lock_destroyed( lck );
#endif /* USE_ITT_BUILD */

    DESTROY_NESTED_LOCK( lck );

    if ( ( __kmp_user_lock_kind == lk_tas ) && ( sizeof( lck->tas.lk.poll )
     + sizeof( lck->tas.lk.depth_locked ) <= OMP_NEST_LOCK_T_SIZE ) ) {
        ;
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
     && ( sizeof( lck->futex.lk.poll ) + sizeof( lck->futex.lk.depth_locked )
     <= OMP_NEST_LOCK_T_SIZE ) ) {
        ;
    }
#endif
    else {
        __kmp_user_lock_free( user_lock, gtid, lck );
    }
#endif // KMP_USE_DYNAMIC_LOCK
} // __kmpc_destroy_nest_lock

void
__kmpc_set_lock( ident_t * loc, kmp_int32 gtid, void ** user_lock ) {
    KMP_COUNT_BLOCK(OMP_set_lock);
#if KMP_USE_DYNAMIC_LOCK
    int tag = DYNA_EXTRACT_D_TAG(user_lock);
# if USE_ITT_BUILD
   __kmp_itt_lock_acquiring((kmp_user_lock_p)user_lock); // itt function will get to the right lock object.
# endif
# if DYNA_USE_FAST_TAS
    if (tag == locktag_tas && !__kmp_env_consistency_check) {
        DYNA_ACQUIRE_TAS_LOCK(user_lock, gtid);
    } else
# elif DYNA_USE_FAST_FUTEX
    if (tag == locktag_futex && !__kmp_env_consistency_check) {
        DYNA_ACQUIRE_FUTEX_LOCK(user_lock, gtid);
    } else
# endif
    {
        __kmp_direct_set_ops[tag]((kmp_dyna_lock_t *)user_lock, gtid);
    }
# if USE_ITT_BUILD
    __kmp_itt_lock_acquired((kmp_user_lock_p)user_lock);
# endif

#else // KMP_USE_DYNAMIC_LOCK

    kmp_user_lock_p lck;

    if ( ( __kmp_user_lock_kind == lk_tas )
      && ( sizeof( lck->tas.lk.poll ) <= OMP_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
      && ( sizeof( lck->futex.lk.poll ) <= OMP_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#endif
    else {
        lck = __kmp_lookup_user_lock( user_lock, "omp_set_lock" );
    }

#if USE_ITT_BUILD
    __kmp_itt_lock_acquiring( lck );
#endif /* USE_ITT_BUILD */

    ACQUIRE_LOCK( lck, gtid );

#if USE_ITT_BUILD
    __kmp_itt_lock_acquired( lck );
#endif /* USE_ITT_BUILD */

#endif // KMP_USE_DYNAMIC_LOCK
}

void
__kmpc_set_nest_lock( ident_t * loc, kmp_int32 gtid, void ** user_lock ) {
#if KMP_USE_DYNAMIC_LOCK

# if USE_ITT_BUILD
    __kmp_itt_lock_acquiring((kmp_user_lock_p)user_lock);
# endif
    DYNA_D_LOCK_FUNC(user_lock, set)((kmp_dyna_lock_t *)user_lock, gtid);
# if USE_ITT_BUILD
    __kmp_itt_lock_acquired((kmp_user_lock_p)user_lock);
#endif

#else // KMP_USE_DYNAMIC_LOCK
    kmp_user_lock_p lck;

    if ( ( __kmp_user_lock_kind == lk_tas ) && ( sizeof( lck->tas.lk.poll )
      + sizeof( lck->tas.lk.depth_locked ) <= OMP_NEST_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
     && ( sizeof( lck->futex.lk.poll ) + sizeof( lck->futex.lk.depth_locked )
     <= OMP_NEST_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#endif
    else {
        lck = __kmp_lookup_user_lock( user_lock, "omp_set_nest_lock" );
    }

#if USE_ITT_BUILD
    __kmp_itt_lock_acquiring( lck );
#endif /* USE_ITT_BUILD */

    ACQUIRE_NESTED_LOCK( lck, gtid );

#if USE_ITT_BUILD
    __kmp_itt_lock_acquired( lck );
#endif /* USE_ITT_BUILD */
#endif // KMP_USE_DYNAMIC_LOCK
}

void
__kmpc_unset_lock( ident_t *loc, kmp_int32 gtid, void **user_lock )
{
#if KMP_USE_DYNAMIC_LOCK

    int tag = DYNA_EXTRACT_D_TAG(user_lock);
# if USE_ITT_BUILD
    __kmp_itt_lock_releasing((kmp_user_lock_p)user_lock);
# endif
# if DYNA_USE_FAST_TAS
    if (tag == locktag_tas && !__kmp_env_consistency_check) {
        DYNA_RELEASE_TAS_LOCK(user_lock, gtid);
    } else
# elif DYNA_USE_FAST_FUTEX
    if (tag == locktag_futex && !__kmp_env_consistency_check) {
        DYNA_RELEASE_FUTEX_LOCK(user_lock, gtid);
    } else
# endif
    {
        __kmp_direct_unset_ops[tag]((kmp_dyna_lock_t *)user_lock, gtid);
    }

#else // KMP_USE_DYNAMIC_LOCK

    kmp_user_lock_p lck;

    /* Can't use serial interval since not block structured */
    /* release the lock */

    if ( ( __kmp_user_lock_kind == lk_tas )
      && ( sizeof( lck->tas.lk.poll ) <= OMP_LOCK_T_SIZE ) ) {
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
        // "fast" path implemented to fix customer performance issue
#if USE_ITT_BUILD
        __kmp_itt_lock_releasing( (kmp_user_lock_p)user_lock );
#endif /* USE_ITT_BUILD */
        TCW_4(((kmp_user_lock_p)user_lock)->tas.lk.poll, 0);
        KMP_MB();
        return;
#else
        lck = (kmp_user_lock_p)user_lock;
#endif
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
      && ( sizeof( lck->futex.lk.poll ) <= OMP_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#endif
    else {
        lck = __kmp_lookup_user_lock( user_lock, "omp_unset_lock" );
    }

#if USE_ITT_BUILD
    __kmp_itt_lock_releasing( lck );
#endif /* USE_ITT_BUILD */

    RELEASE_LOCK( lck, gtid );

#if OMPT_SUPPORT && OMPT_BLAME
    if (ompt_enabled &&
        ompt_callbacks.ompt_callback(ompt_event_release_lock)) {
        ompt_callbacks.ompt_callback(ompt_event_release_lock)((uint64_t) lck);
    }
#endif

#endif // KMP_USE_DYNAMIC_LOCK
}

/* release the lock */
void
__kmpc_unset_nest_lock( ident_t *loc, kmp_int32 gtid, void **user_lock )
{
#if KMP_USE_DYNAMIC_LOCK

# if USE_ITT_BUILD
    __kmp_itt_lock_releasing((kmp_user_lock_p)user_lock);
# endif
    DYNA_D_LOCK_FUNC(user_lock, unset)((kmp_dyna_lock_t *)user_lock, gtid);

#else // KMP_USE_DYNAMIC_LOCK

    kmp_user_lock_p lck;

    /* Can't use serial interval since not block structured */

    if ( ( __kmp_user_lock_kind == lk_tas ) && ( sizeof( lck->tas.lk.poll )
      + sizeof( lck->tas.lk.depth_locked ) <= OMP_NEST_LOCK_T_SIZE ) ) {
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
        // "fast" path implemented to fix customer performance issue
        kmp_tas_lock_t *tl = (kmp_tas_lock_t*)user_lock;
#if USE_ITT_BUILD
        __kmp_itt_lock_releasing( (kmp_user_lock_p)user_lock );
#endif /* USE_ITT_BUILD */
        if ( --(tl->lk.depth_locked) == 0 ) {
            TCW_4(tl->lk.poll, 0);
        }
        KMP_MB();
        return;
#else
        lck = (kmp_user_lock_p)user_lock;
#endif
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
     && ( sizeof( lck->futex.lk.poll ) + sizeof( lck->futex.lk.depth_locked )
     <= OMP_NEST_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#endif
    else {
        lck = __kmp_lookup_user_lock( user_lock, "omp_unset_nest_lock" );
    }

#if USE_ITT_BUILD
    __kmp_itt_lock_releasing( lck );
#endif /* USE_ITT_BUILD */

    int release_status;
    release_status = RELEASE_NESTED_LOCK( lck, gtid );
#if OMPT_SUPPORT && OMPT_BLAME
    if (ompt_enabled) {
        if (release_status == KMP_LOCK_RELEASED) {
            if (ompt_callbacks.ompt_callback(ompt_event_release_nest_lock_last)) {
                ompt_callbacks.ompt_callback(ompt_event_release_nest_lock_last)(
                    (uint64_t) lck);
            }
        } else if (ompt_callbacks.ompt_callback(ompt_event_release_nest_lock_prev)) {
            ompt_callbacks.ompt_callback(ompt_event_release_nest_lock_prev)(
                (uint64_t) lck);
        }
    }
#endif

#endif // KMP_USE_DYNAMIC_LOCK
}

/* try to acquire the lock */
int
__kmpc_test_lock( ident_t *loc, kmp_int32 gtid, void **user_lock )
{
    KMP_COUNT_BLOCK(OMP_test_lock);

#if KMP_USE_DYNAMIC_LOCK
    int rc;
    int tag = DYNA_EXTRACT_D_TAG(user_lock);
# if USE_ITT_BUILD
    __kmp_itt_lock_acquiring((kmp_user_lock_p)user_lock);
# endif
# if DYNA_USE_FAST_TAS
    if (tag == locktag_tas && !__kmp_env_consistency_check) {
        DYNA_TEST_TAS_LOCK(user_lock, gtid, rc);
    } else
# elif DYNA_USE_FAST_FUTEX
    if (tag == locktag_futex && !__kmp_env_consistency_check) {
        DYNA_TEST_FUTEX_LOCK(user_lock, gtid, rc);
    } else
# endif
    {
        rc = __kmp_direct_test_ops[tag]((kmp_dyna_lock_t *)user_lock, gtid);
    }
    if (rc) {
# if USE_ITT_BUILD
        __kmp_itt_lock_acquired((kmp_user_lock_p)user_lock);
# endif
        return FTN_TRUE;
    } else {
# if USE_ITT_BUILD
        __kmp_itt_lock_cancelled((kmp_user_lock_p)user_lock);
# endif
        return FTN_FALSE;
    }

#else // KMP_USE_DYNAMIC_LOCK

    kmp_user_lock_p lck;
    int          rc;

    if ( ( __kmp_user_lock_kind == lk_tas )
      && ( sizeof( lck->tas.lk.poll ) <= OMP_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
      && ( sizeof( lck->futex.lk.poll ) <= OMP_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#endif
    else {
        lck = __kmp_lookup_user_lock( user_lock, "omp_test_lock" );
    }

#if USE_ITT_BUILD
    __kmp_itt_lock_acquiring( lck );
#endif /* USE_ITT_BUILD */

    rc = TEST_LOCK( lck, gtid );
#if USE_ITT_BUILD
    if ( rc ) {
        __kmp_itt_lock_acquired( lck );
    } else {
        __kmp_itt_lock_cancelled( lck );
    }
#endif /* USE_ITT_BUILD */
    return ( rc ? FTN_TRUE : FTN_FALSE );

    /* Can't use serial interval since not block structured */

#endif // KMP_USE_DYNAMIC_LOCK
}

/* try to acquire the lock */
int
__kmpc_test_nest_lock( ident_t *loc, kmp_int32 gtid, void **user_lock )
{
#if KMP_USE_DYNAMIC_LOCK
    int rc;
# if USE_ITT_BUILD
    __kmp_itt_lock_acquiring((kmp_user_lock_p)user_lock);
# endif
    rc = DYNA_D_LOCK_FUNC(user_lock, test)((kmp_dyna_lock_t *)user_lock, gtid);
# if USE_ITT_BUILD
    if (rc) {
        __kmp_itt_lock_acquired((kmp_user_lock_p)user_lock);
    } else {
        __kmp_itt_lock_cancelled((kmp_user_lock_p)user_lock);
    }
# endif
    return rc;

#else // KMP_USE_DYNAMIC_LOCK

    kmp_user_lock_p lck;
    int          rc;

    if ( ( __kmp_user_lock_kind == lk_tas ) && ( sizeof( lck->tas.lk.poll )
      + sizeof( lck->tas.lk.depth_locked ) <= OMP_NEST_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#if KMP_OS_LINUX && (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64)
    else if ( ( __kmp_user_lock_kind == lk_futex )
     && ( sizeof( lck->futex.lk.poll ) + sizeof( lck->futex.lk.depth_locked )
     <= OMP_NEST_LOCK_T_SIZE ) ) {
        lck = (kmp_user_lock_p)user_lock;
    }
#endif
    else {
        lck = __kmp_lookup_user_lock( user_lock, "omp_test_nest_lock" );
    }

#if USE_ITT_BUILD
    __kmp_itt_lock_acquiring( lck );
#endif /* USE_ITT_BUILD */

    rc = TEST_NESTED_LOCK( lck, gtid );
#if USE_ITT_BUILD
    if ( rc ) {
        __kmp_itt_lock_acquired( lck );
    } else {
        __kmp_itt_lock_cancelled( lck );
    }
#endif /* USE_ITT_BUILD */
    return rc;

    /* Can't use serial interval since not block structured */

#endif // KMP_USE_DYNAMIC_LOCK
}


/*--------------------------------------------------------------------------------------------------------------------*/

/*
 * Interface to fast scalable reduce methods routines
 */

// keep the selected method in a thread local structure for cross-function usage: will be used in __kmpc_end_reduce* functions;
// another solution: to re-determine the method one more time in __kmpc_end_reduce* functions (new prototype required then)
// AT: which solution is better?
#define __KMP_SET_REDUCTION_METHOD(gtid,rmethod) \
                   ( ( __kmp_threads[ ( gtid ) ] -> th.th_local.packed_reduction_method ) = ( rmethod ) )

#define __KMP_GET_REDUCTION_METHOD(gtid) \
                   ( __kmp_threads[ ( gtid ) ] -> th.th_local.packed_reduction_method )

// description of the packed_reduction_method variable: look at the macros in kmp.h


// used in a critical section reduce block
static __forceinline void
__kmp_enter_critical_section_reduce_block( ident_t * loc, kmp_int32 global_tid, kmp_critical_name * crit ) {

    // this lock was visible to a customer and to the threading profile tool as a serial overhead span
    //            (although it's used for an internal purpose only)
    //            why was it visible in previous implementation?
    //            should we keep it visible in new reduce block?
    kmp_user_lock_p lck;

#if KMP_USE_DYNAMIC_LOCK

    if (DYNA_IS_D_LOCK(__kmp_user_lock_seq)) {
        lck = (kmp_user_lock_p)crit;
        if (*((kmp_dyna_lock_t *)lck) == 0) {
            KMP_COMPARE_AND_STORE_ACQ32((volatile kmp_int32 *)lck, 0, DYNA_GET_D_TAG(__kmp_user_lock_seq));
        }
        KMP_DEBUG_ASSERT(lck != NULL);
        if (__kmp_env_consistency_check) {
            __kmp_push_sync(global_tid, ct_critical, loc, lck, __kmp_user_lock_seq);
        }
        DYNA_D_LOCK_FUNC(lck, set)((kmp_dyna_lock_t *)lck, global_tid);
    } else {
        kmp_indirect_lock_t *ilk = __kmp_get_indirect_csptr(crit, loc, global_tid, __kmp_user_lock_seq);
        KMP_DEBUG_ASSERT(ilk != NULL);
        if (__kmp_env_consistency_check) {
            __kmp_push_sync(global_tid, ct_critical, loc, ilk->lock, __kmp_user_lock_seq);
        }
        DYNA_I_LOCK_FUNC(ilk, set)(ilk->lock, global_tid);
    }

#else // KMP_USE_DYNAMIC_LOCK

    // We know that the fast reduction code is only emitted by Intel compilers
    // with 32 byte critical sections. If there isn't enough space, then we
    // have to use a pointer.
    if ( __kmp_base_user_lock_size <= INTEL_CRITICAL_SIZE ) {
        lck = (kmp_user_lock_p)crit;
    }
    else {
        lck = __kmp_get_critical_section_ptr( crit, loc, global_tid );
    }
    KMP_DEBUG_ASSERT( lck != NULL );

    if ( __kmp_env_consistency_check )
        __kmp_push_sync( global_tid, ct_critical, loc, lck );

    __kmp_acquire_user_lock_with_checks( lck, global_tid );

#endif // KMP_USE_DYNAMIC_LOCK
}

// used in a critical section reduce block
static __forceinline void
__kmp_end_critical_section_reduce_block( ident_t * loc, kmp_int32 global_tid, kmp_critical_name * crit ) {

    kmp_user_lock_p lck;

#if KMP_USE_DYNAMIC_LOCK

    if (DYNA_IS_D_LOCK(__kmp_user_lock_seq)) {
        lck = (kmp_user_lock_p)crit;
        if (__kmp_env_consistency_check)
            __kmp_pop_sync(global_tid, ct_critical, loc);
        DYNA_D_LOCK_FUNC(lck, unset)((kmp_dyna_lock_t *)lck, global_tid);
    } else {
        kmp_indirect_lock_t *ilk = (kmp_indirect_lock_t *)TCR_PTR(*((kmp_indirect_lock_t **)crit));
        if (__kmp_env_consistency_check)
            __kmp_pop_sync(global_tid, ct_critical, loc);
        DYNA_I_LOCK_FUNC(ilk, unset)(ilk->lock, global_tid);
    }

#else // KMP_USE_DYNAMIC_LOCK

    // We know that the fast reduction code is only emitted by Intel compilers with 32 byte critical
    // sections. If there isn't enough space, then we have to use a pointer.
    if ( __kmp_base_user_lock_size > 32 ) {
        lck = *( (kmp_user_lock_p *) crit );
        KMP_ASSERT( lck != NULL );
    } else {
        lck = (kmp_user_lock_p) crit;
    }

    if ( __kmp_env_consistency_check )
        __kmp_pop_sync( global_tid, ct_critical, loc );

    __kmp_release_user_lock_with_checks( lck, global_tid );

#endif // KMP_USE_DYNAMIC_LOCK
} // __kmp_end_critical_section_reduce_block


/* 2.a.i. Reduce Block without a terminating barrier */
/*!
@ingroup SYNCHRONIZATION
@param loc source location information
@param global_tid global thread number
@param num_vars number of items (variables) to be reduced
@param reduce_size size of data in bytes to be reduced
@param reduce_data pointer to data to be reduced
@param reduce_func callback function providing reduction operation on two operands and returning result of reduction in lhs_data
@param lck pointer to the unique lock data structure
@result 1 for the master thread, 0 for all other team threads, 2 for all team threads if atomic reduction needed

The nowait version is used for a reduce clause with the nowait argument.
*/
kmp_int32
__kmpc_reduce_nowait(
    ident_t *loc, kmp_int32 global_tid,
    kmp_int32 num_vars, size_t reduce_size, void *reduce_data, void (*reduce_func)(void *lhs_data, void *rhs_data),
    kmp_critical_name *lck ) {

    KMP_COUNT_BLOCK(REDUCE_nowait);
    int retval = 0;
    PACKED_REDUCTION_METHOD_T packed_reduction_method;
#if OMP_40_ENABLED
    kmp_team_t *team;
    kmp_info_t *th;
    int teams_swapped = 0, task_state;
#endif
    KA_TRACE( 10, ( "__kmpc_reduce_nowait() enter: called T#%d\n", global_tid ) );

    // why do we need this initialization here at all?
    // Reduction clause can not be used as a stand-alone directive.

    // do not call __kmp_serial_initialize(), it will be called by __kmp_parallel_initialize() if needed
    // possible detection of false-positive race by the threadchecker ???
    if( ! TCR_4( __kmp_init_parallel ) )
        __kmp_parallel_initialize();

    // check correctness of reduce block nesting
#if KMP_USE_DYNAMIC_LOCK
    if ( __kmp_env_consistency_check )
        __kmp_push_sync( global_tid, ct_reduce, loc, NULL, 0 );
#else
    if ( __kmp_env_consistency_check )
        __kmp_push_sync( global_tid, ct_reduce, loc, NULL );
#endif

#if OMP_40_ENABLED
    th = __kmp_thread_from_gtid(global_tid);
    if( th->th.th_teams_microtask ) {   // AC: check if we are inside the teams construct?
        team = th->th.th_team;
        if( team->t.t_level == th->th.th_teams_level ) {
            // this is reduction at teams construct
            KMP_DEBUG_ASSERT(!th->th.th_info.ds.ds_tid);  // AC: check that tid == 0
            // Let's swap teams temporarily for the reduction barrier
            teams_swapped = 1;
            th->th.th_info.ds.ds_tid = team->t.t_master_tid;
            th->th.th_team = team->t.t_parent;
            th->th.th_team_nproc = th->th.th_team->t.t_nproc;
            th->th.th_task_team = th->th.th_team->t.t_task_team[0];
            task_state = th->th.th_task_state;
            th->th.th_task_state = 0;
        }
    }
#endif // OMP_40_ENABLED

    // packed_reduction_method value will be reused by __kmp_end_reduce* function, the value should be kept in a variable
    // the variable should be either a construct-specific or thread-specific property, not a team specific property
    //     (a thread can reach the next reduce block on the next construct, reduce method may differ on the next construct)
    // an ident_t "loc" parameter could be used as a construct-specific property (what if loc == 0?)
    //     (if both construct-specific and team-specific variables were shared, then unness extra syncs should be needed)
    // a thread-specific variable is better regarding two issues above (next construct and extra syncs)
    // a thread-specific "th_local.reduction_method" variable is used currently
    // each thread executes 'determine' and 'set' lines (no need to execute by one thread, to avoid unness extra syncs)

    packed_reduction_method = __kmp_determine_reduction_method( loc, global_tid, num_vars, reduce_size, reduce_data, reduce_func, lck );
    __KMP_SET_REDUCTION_METHOD( global_tid, packed_reduction_method );

    if( packed_reduction_method == critical_reduce_block ) {

        __kmp_enter_critical_section_reduce_block( loc, global_tid, lck );
        retval = 1;

    } else if( packed_reduction_method == empty_reduce_block ) {

        // usage: if team size == 1, no synchronization is required ( Intel platforms only )
        retval = 1;

    } else if( packed_reduction_method == atomic_reduce_block ) {

        retval = 2;

        // all threads should do this pop here (because __kmpc_end_reduce_nowait() won't be called by the code gen)
        //     (it's not quite good, because the checking block has been closed by this 'pop',
        //      but atomic operation has not been executed yet, will be executed slightly later, literally on next instruction)
        if ( __kmp_env_consistency_check )
            __kmp_pop_sync( global_tid, ct_reduce, loc );

    } else if( TEST_REDUCTION_METHOD( packed_reduction_method, tree_reduce_block ) ) {

        //AT: performance issue: a real barrier here
        //AT:     (if master goes slow, other threads are blocked here waiting for the master to come and release them)
        //AT:     (it's not what a customer might expect specifying NOWAIT clause)
        //AT:     (specifying NOWAIT won't result in improvement of performance, it'll be confusing to a customer)
        //AT: another implementation of *barrier_gather*nowait() (or some other design) might go faster
        //        and be more in line with sense of NOWAIT
        //AT: TO DO: do epcc test and compare times

        // this barrier should be invisible to a customer and to the threading profile tool
        //              (it's neither a terminating barrier nor customer's code, it's used for an internal purpose)
#if USE_ITT_NOTIFY
        __kmp_threads[global_tid]->th.th_ident = loc;
#endif
        retval = __kmp_barrier( UNPACK_REDUCTION_BARRIER( packed_reduction_method ), global_tid, FALSE, reduce_size, reduce_data, reduce_func );
        retval = ( retval != 0 ) ? ( 0 ) : ( 1 );

        // all other workers except master should do this pop here
        //     ( none of other workers will get to __kmpc_end_reduce_nowait() )
        if ( __kmp_env_consistency_check ) {
            if( retval == 0 ) {
                __kmp_pop_sync( global_tid, ct_reduce, loc );
            }
        }

    } else {

        // should never reach this block
        KMP_ASSERT( 0 ); // "unexpected method"

    }
#if OMP_40_ENABLED
    if( teams_swapped ) {
        // Restore thread structure
        th->th.th_info.ds.ds_tid = 0;
        th->th.th_team = team;
        th->th.th_team_nproc = team->t.t_nproc;
        th->th.th_task_team = team->t.t_task_team[task_state];
        th->th.th_task_state = task_state;
    }
#endif
    KA_TRACE( 10, ( "__kmpc_reduce_nowait() exit: called T#%d: method %08x, returns %08x\n", global_tid, packed_reduction_method, retval ) );

    return retval;
}

/*!
@ingroup SYNCHRONIZATION
@param loc source location information
@param global_tid global thread id.
@param lck pointer to the unique lock data structure

Finish the execution of a reduce nowait.
*/
void
__kmpc_end_reduce_nowait( ident_t *loc, kmp_int32 global_tid, kmp_critical_name *lck ) {

    PACKED_REDUCTION_METHOD_T packed_reduction_method;

    KA_TRACE( 10, ( "__kmpc_end_reduce_nowait() enter: called T#%d\n", global_tid ) );

    packed_reduction_method = __KMP_GET_REDUCTION_METHOD( global_tid );

    if( packed_reduction_method == critical_reduce_block ) {

        __kmp_end_critical_section_reduce_block( loc, global_tid, lck );

    } else if( packed_reduction_method == empty_reduce_block ) {

        // usage: if team size == 1, no synchronization is required ( on Intel platforms only )

    } else if( packed_reduction_method == atomic_reduce_block ) {

        // neither master nor other workers should get here
        //     (code gen does not generate this call in case 2: atomic reduce block)
        // actually it's better to remove this elseif at all;
        // after removal this value will checked by the 'else' and will assert

    } else if( TEST_REDUCTION_METHOD( packed_reduction_method, tree_reduce_block ) ) {

        // only master gets here

    } else {

        // should never reach this block
        KMP_ASSERT( 0 ); // "unexpected method"

    }

    if ( __kmp_env_consistency_check )
        __kmp_pop_sync( global_tid, ct_reduce, loc );

    KA_TRACE( 10, ( "__kmpc_end_reduce_nowait() exit: called T#%d: method %08x\n", global_tid, packed_reduction_method ) );

    return;
}

/* 2.a.ii. Reduce Block with a terminating barrier */

/*!
@ingroup SYNCHRONIZATION
@param loc source location information
@param global_tid global thread number
@param num_vars number of items (variables) to be reduced
@param reduce_size size of data in bytes to be reduced
@param reduce_data pointer to data to be reduced
@param reduce_func callback function providing reduction operation on two operands and returning result of reduction in lhs_data
@param lck pointer to the unique lock data structure
@result 1 for the master thread, 0 for all other team threads, 2 for all team threads if atomic reduction needed

A blocking reduce that includes an implicit barrier.
*/
kmp_int32
__kmpc_reduce(
    ident_t *loc, kmp_int32 global_tid,
    kmp_int32 num_vars, size_t reduce_size, void *reduce_data,
    void (*reduce_func)(void *lhs_data, void *rhs_data),
    kmp_critical_name *lck )
{
    KMP_COUNT_BLOCK(REDUCE_wait);
    int retval = 0;
    PACKED_REDUCTION_METHOD_T packed_reduction_method;

    KA_TRACE( 10, ( "__kmpc_reduce() enter: called T#%d\n", global_tid ) );

    // why do we need this initialization here at all?
    // Reduction clause can not be a stand-alone directive.

    // do not call __kmp_serial_initialize(), it will be called by __kmp_parallel_initialize() if needed
    // possible detection of false-positive race by the threadchecker ???
    if( ! TCR_4( __kmp_init_parallel ) )
        __kmp_parallel_initialize();

    // check correctness of reduce block nesting
#if KMP_USE_DYNAMIC_LOCK
    if ( __kmp_env_consistency_check )
        __kmp_push_sync( global_tid, ct_reduce, loc, NULL, 0 );
#else
    if ( __kmp_env_consistency_check )
        __kmp_push_sync( global_tid, ct_reduce, loc, NULL );
#endif

    packed_reduction_method = __kmp_determine_reduction_method( loc, global_tid, num_vars, reduce_size, reduce_data, reduce_func, lck );
    __KMP_SET_REDUCTION_METHOD( global_tid, packed_reduction_method );

    if( packed_reduction_method == critical_reduce_block ) {

        __kmp_enter_critical_section_reduce_block( loc, global_tid, lck );
        retval = 1;

    } else if( packed_reduction_method == empty_reduce_block ) {

        // usage: if team size == 1, no synchronization is required ( Intel platforms only )
        retval = 1;

    } else if( packed_reduction_method == atomic_reduce_block ) {

        retval = 2;

    } else if( TEST_REDUCTION_METHOD( packed_reduction_method, tree_reduce_block ) ) {

        //case tree_reduce_block:
        // this barrier should be visible to a customer and to the threading profile tool
        //              (it's a terminating barrier on constructs if NOWAIT not specified)
#if USE_ITT_NOTIFY
        __kmp_threads[global_tid]->th.th_ident = loc; // needed for correct notification of frames
#endif
        retval = __kmp_barrier( UNPACK_REDUCTION_BARRIER( packed_reduction_method ), global_tid, TRUE, reduce_size, reduce_data, reduce_func );
        retval = ( retval != 0 ) ? ( 0 ) : ( 1 );

        // all other workers except master should do this pop here
        //     ( none of other workers except master will enter __kmpc_end_reduce() )
        if ( __kmp_env_consistency_check ) {
            if( retval == 0 ) { // 0: all other workers; 1: master
                __kmp_pop_sync( global_tid, ct_reduce, loc );
            }
        }

    } else {

        // should never reach this block
        KMP_ASSERT( 0 ); // "unexpected method"

    }

    KA_TRACE( 10, ( "__kmpc_reduce() exit: called T#%d: method %08x, returns %08x\n", global_tid, packed_reduction_method, retval ) );

    return retval;
}

/*!
@ingroup SYNCHRONIZATION
@param loc source location information
@param global_tid global thread id.
@param lck pointer to the unique lock data structure

Finish the execution of a blocking reduce.
The <tt>lck</tt> pointer must be the same as that used in the corresponding start function.
*/
void
__kmpc_end_reduce( ident_t *loc, kmp_int32 global_tid, kmp_critical_name *lck ) {

    PACKED_REDUCTION_METHOD_T packed_reduction_method;

    KA_TRACE( 10, ( "__kmpc_end_reduce() enter: called T#%d\n", global_tid ) );

    packed_reduction_method = __KMP_GET_REDUCTION_METHOD( global_tid );

    // this barrier should be visible to a customer and to the threading profile tool
    //              (it's a terminating barrier on constructs if NOWAIT not specified)

    if( packed_reduction_method == critical_reduce_block ) {

        __kmp_end_critical_section_reduce_block( loc, global_tid, lck );

        // TODO: implicit barrier: should be exposed
#if USE_ITT_NOTIFY
        __kmp_threads[global_tid]->th.th_ident = loc;
#endif
        __kmp_barrier( bs_plain_barrier, global_tid, FALSE, 0, NULL, NULL );

    } else if( packed_reduction_method == empty_reduce_block ) {

        // usage: if team size == 1, no synchronization is required ( Intel platforms only )

        // TODO: implicit barrier: should be exposed
#if USE_ITT_NOTIFY
        __kmp_threads[global_tid]->th.th_ident = loc;
#endif
        __kmp_barrier( bs_plain_barrier, global_tid, FALSE, 0, NULL, NULL );

    } else if( packed_reduction_method == atomic_reduce_block ) {

        // TODO: implicit barrier: should be exposed
#if USE_ITT_NOTIFY
        __kmp_threads[global_tid]->th.th_ident = loc;
#endif
        __kmp_barrier( bs_plain_barrier, global_tid, FALSE, 0, NULL, NULL );

    } else if( TEST_REDUCTION_METHOD( packed_reduction_method, tree_reduce_block ) ) {

        // only master executes here (master releases all other workers)
        __kmp_end_split_barrier( UNPACK_REDUCTION_BARRIER( packed_reduction_method ), global_tid );

    } else {

        // should never reach this block
        KMP_ASSERT( 0 ); // "unexpected method"

    }

    if ( __kmp_env_consistency_check )
        __kmp_pop_sync( global_tid, ct_reduce, loc );

    KA_TRACE( 10, ( "__kmpc_end_reduce() exit: called T#%d: method %08x\n", global_tid, packed_reduction_method ) );

    return;
}

#undef __KMP_GET_REDUCTION_METHOD
#undef __KMP_SET_REDUCTION_METHOD

/*-- end of interface to fast scalable reduce routines ---------------------------------------------------------------*/

kmp_uint64
__kmpc_get_taskid() {

    kmp_int32    gtid;
    kmp_info_t * thread;

    gtid = __kmp_get_gtid();
    if ( gtid < 0 ) {
        return 0;
    }; // if
    thread = __kmp_thread_from_gtid( gtid );
    return thread->th.th_current_task->td_task_id;

} // __kmpc_get_taskid


kmp_uint64
__kmpc_get_parent_taskid() {

    kmp_int32        gtid;
    kmp_info_t *     thread;
    kmp_taskdata_t * parent_task;

    gtid = __kmp_get_gtid();
    if ( gtid < 0 ) {
        return 0;
    }; // if
    thread      = __kmp_thread_from_gtid( gtid );
    parent_task = thread->th.th_current_task->td_parent;
    return ( parent_task == NULL ? 0 : parent_task->td_task_id );

} // __kmpc_get_parent_taskid

void __kmpc_place_threads(int nS, int sO, int nC, int cO, int nT)
{
    if ( ! __kmp_init_serial ) {
        __kmp_serial_initialize();
    }
    __kmp_place_num_sockets = nS;
    __kmp_place_socket_offset = sO;
    __kmp_place_num_cores = nC;
    __kmp_place_core_offset = cO;
    __kmp_place_num_threads_per_core = nT;
}

// end of file //