openmp/runtime/src/kmp_global.c

/*
 * kmp_global.c -- KPTS global variables for runtime support library
 */


//===----------------------------------------------------------------------===//
//
//                     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 "kmp.h"

#ifdef KMP_SETVERSION
char __kmp_setversion_string[] = VERSION_STRING;
#endif

kmp_key_t __kmp_gtid_threadprivate_key;

kmp_cpuinfo_t   __kmp_cpuinfo = { 0 }; // Not initialized

#if KMP_STATS_ENABLED
#include "kmp_stats.h"
// lock for modifying the global __kmp_stats_list
kmp_tas_lock_t __kmp_stats_lock = KMP_TAS_LOCK_INITIALIZER(__kmp_stats_lock);

// global list of per thread stats, the head is a sentinel node which accumulates all stats produced before __kmp_create_worker is called.
kmp_stats_list __kmp_stats_list;

// thread local pointer to stats node within list
__thread kmp_stats_list* __kmp_stats_thread_ptr = &__kmp_stats_list;

// gives reference tick for all events (considered the 0 tick)
tsc_tick_count __kmp_stats_start_time;
#endif

/* ----------------------------------------------------- */
/* INITIALIZATION VARIABLES */
/* they are syncronized to write during init, but read anytime */
volatile int        __kmp_init_serial     = FALSE;
volatile int        __kmp_init_gtid       = FALSE;
volatile int        __kmp_init_common     = FALSE;
volatile int        __kmp_init_middle     = FALSE;
volatile int        __kmp_init_parallel   = FALSE;
volatile int        __kmp_init_monitor    = 0;  /* 1 - launched, 2 - actually started (Windows* OS only) */
volatile int        __kmp_init_user_locks = FALSE;

/* list of address of allocated caches for commons */
kmp_cached_addr_t  *__kmp_threadpriv_cache_list = NULL;

int                 __kmp_init_counter  = 0;
int                 __kmp_root_counter  = 0;
int                 __kmp_version       = 0;

volatile kmp_uint32 __kmp_team_counter  = 0;
volatile kmp_uint32 __kmp_task_counter  = 0;

unsigned int __kmp_init_wait = KMP_DEFAULT_INIT_WAIT;   /* initial number of spin-tests   */
unsigned int __kmp_next_wait = KMP_DEFAULT_NEXT_WAIT;   /* susequent number of spin-tests */

size_t      __kmp_stksize         = KMP_DEFAULT_STKSIZE;
size_t      __kmp_monitor_stksize = 0;  // auto adjust
size_t      __kmp_stkoffset       = KMP_DEFAULT_STKOFFSET;
int         __kmp_stkpadding      = KMP_MIN_STKPADDING;

size_t    __kmp_malloc_pool_incr  = KMP_DEFAULT_MALLOC_POOL_INCR;

/* Barrier method defaults, settings, and strings */
/* branch factor = 2^branch_bits (only relevant for tree and hyper barrier types) */
#if KMP_ARCH_X86_64
kmp_uint32 __kmp_barrier_gather_bb_dflt      = 2;  /* branch_factor = 4 */ /* hyper2: C78980 */
kmp_uint32 __kmp_barrier_release_bb_dflt     = 2;  /* branch_factor = 4 */ /* hyper2: C78980 */
#else
kmp_uint32 __kmp_barrier_gather_bb_dflt      = 2;  /* branch_factor = 4 */ /* communication in core for MIC */
kmp_uint32 __kmp_barrier_release_bb_dflt     = 2;  /* branch_factor = 4 */ /* communication in core for MIC */
#endif // KMP_ARCH_X86_64
#if KMP_ARCH_X86_64
kmp_bar_pat_e __kmp_barrier_gather_pat_dflt  = bp_hyper_bar;  /* hyper2: C78980 */
kmp_bar_pat_e __kmp_barrier_release_pat_dflt = bp_hyper_bar;  /* hyper2: C78980 */
#else
kmp_bar_pat_e __kmp_barrier_gather_pat_dflt  = bp_linear_bar;
kmp_bar_pat_e __kmp_barrier_release_pat_dflt = bp_linear_bar;
#endif
kmp_uint32 __kmp_barrier_gather_branch_bits  [ bs_last_barrier ] = { 0 };
kmp_uint32 __kmp_barrier_release_branch_bits [ bs_last_barrier ] = { 0 };
kmp_bar_pat_e __kmp_barrier_gather_pattern   [ bs_last_barrier ] = { bp_linear_bar };
kmp_bar_pat_e __kmp_barrier_release_pattern  [ bs_last_barrier ] = { bp_linear_bar };
char const *__kmp_barrier_branch_bit_env_name [ bs_last_barrier ] =
                            { "KMP_PLAIN_BARRIER", "KMP_FORKJOIN_BARRIER"
                                #if KMP_FAST_REDUCTION_BARRIER
                                    , "KMP_REDUCTION_BARRIER"
                                #endif // KMP_FAST_REDUCTION_BARRIER
                            };
char const *__kmp_barrier_pattern_env_name    [ bs_last_barrier ] =
                            { "KMP_PLAIN_BARRIER_PATTERN", "KMP_FORKJOIN_BARRIER_PATTERN"
                                #if KMP_FAST_REDUCTION_BARRIER
                                    , "KMP_REDUCTION_BARRIER_PATTERN"
                                #endif // KMP_FAST_REDUCTION_BARRIER
                            };
char const *__kmp_barrier_type_name           [ bs_last_barrier ] =
                            { "plain", "forkjoin"
                                #if KMP_FAST_REDUCTION_BARRIER
                                    , "reduction"
                                #endif // KMP_FAST_REDUCTION_BARRIER
                            };
char const *__kmp_barrier_pattern_name [ bp_last_bar ] = { "linear", "tree", "hyper", "hierarchical" };


int       __kmp_allThreadsSpecified = 0;
size_t    __kmp_align_alloc = CACHE_LINE;


int     __kmp_generate_warnings = kmp_warnings_low;
int          __kmp_reserve_warn = 0;
int                 __kmp_xproc = 0;
int            __kmp_avail_proc = 0;
size_t    __kmp_sys_min_stksize = KMP_MIN_STKSIZE;
int           __kmp_sys_max_nth = KMP_MAX_NTH;
int               __kmp_max_nth = 0;
int      __kmp_threads_capacity = 0;
int         __kmp_dflt_team_nth = 0;
int      __kmp_dflt_team_nth_ub = 0;
int           __kmp_tp_capacity = 0;
int             __kmp_tp_cached = 0;
int           __kmp_dflt_nested = FALSE;
int __kmp_dflt_max_active_levels = KMP_MAX_ACTIVE_LEVELS_LIMIT; /* max_active_levels limit */
#if KMP_NESTED_HOT_TEAMS
int __kmp_hot_teams_mode         = 0; /* 0 - free extra threads when reduced */
                                      /* 1 - keep extra threads when reduced */
int __kmp_hot_teams_max_level    = 1; /* nesting level of hot teams */
#endif
enum library_type __kmp_library = library_none;
enum sched_type     __kmp_sched = kmp_sch_default;  /* scheduling method for runtime scheduling */
enum sched_type    __kmp_static = kmp_sch_static_greedy; /* default static scheduling method */
enum sched_type    __kmp_guided = kmp_sch_guided_iterative_chunked; /* default guided scheduling method */
enum sched_type      __kmp_auto = kmp_sch_guided_analytical_chunked; /* default auto scheduling method */
int        __kmp_dflt_blocktime = KMP_DEFAULT_BLOCKTIME;
int       __kmp_monitor_wakeups = KMP_MIN_MONITOR_WAKEUPS;
int          __kmp_bt_intervals = KMP_INTERVALS_FROM_BLOCKTIME( KMP_DEFAULT_BLOCKTIME, KMP_MIN_MONITOR_WAKEUPS );
#ifdef KMP_ADJUST_BLOCKTIME
int               __kmp_zero_bt = FALSE;
#endif /* KMP_ADJUST_BLOCKTIME */
#ifdef KMP_DFLT_NTH_CORES
int                __kmp_ncores = 0;
#endif
int                 __kmp_chunk = 0;
int           __kmp_abort_delay = 0;
#if KMP_OS_LINUX && defined(KMP_TDATA_GTID)
int             __kmp_gtid_mode = 3; /* use __declspec(thread) TLS to store gtid */
int      __kmp_adjust_gtid_mode = FALSE;
#elif KMP_OS_WINDOWS
int             __kmp_gtid_mode = 2; /* use TLS functions to store gtid */
int      __kmp_adjust_gtid_mode = FALSE;
#else
int             __kmp_gtid_mode = 0; /* select method to get gtid based on #threads */
int      __kmp_adjust_gtid_mode = TRUE;
#endif /* KMP_OS_LINUX && defined(KMP_TDATA_GTID) */
#ifdef KMP_TDATA_GTID
#if KMP_OS_WINDOWS
__declspec(thread) int __kmp_gtid = KMP_GTID_DNE;
#else
__thread int __kmp_gtid = KMP_GTID_DNE;
#endif /* KMP_OS_WINDOWS - workaround because Intel(R) Many Integrated Core compiler 20110316 doesn't accept __declspec */
#endif /* KMP_TDATA_GTID */
int          __kmp_tls_gtid_min = INT_MAX;
int            __kmp_foreign_tp = TRUE;
#if KMP_ARCH_X86 || KMP_ARCH_X86_64
int    __kmp_inherit_fp_control = TRUE;
kmp_int16  __kmp_init_x87_fpu_control_word = 0;
kmp_uint32     __kmp_init_mxcsr = 0;
#endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */

#ifdef USE_LOAD_BALANCE
double  __kmp_load_balance_interval   = 1.0;
#endif /* USE_LOAD_BALANCE */

kmp_nested_nthreads_t __kmp_nested_nth  = { NULL, 0, 0 };

#if KMP_USE_ADAPTIVE_LOCKS

kmp_adaptive_backoff_params_t __kmp_adaptive_backoff_params = { 1, 1024 }; // TODO: tune it!

#if KMP_DEBUG_ADAPTIVE_LOCKS
char * __kmp_speculative_statsfile = "-";
#endif

#endif // KMP_USE_ADAPTIVE_LOCKS

#if OMP_40_ENABLED
int __kmp_display_env           = FALSE;
int __kmp_display_env_verbose   = FALSE;
int __kmp_omp_cancellation      = FALSE;
#endif

/* map OMP 3.0 schedule types with our internal schedule types */
enum sched_type __kmp_sch_map[ kmp_sched_upper - kmp_sched_lower_ext + kmp_sched_upper_std - kmp_sched_lower - 2 ] = {
    kmp_sch_static_chunked,     // ==> kmp_sched_static            = 1
    kmp_sch_dynamic_chunked,    // ==> kmp_sched_dynamic           = 2
    kmp_sch_guided_chunked,     // ==> kmp_sched_guided            = 3
    kmp_sch_auto,               // ==> kmp_sched_auto              = 4
    kmp_sch_trapezoidal         // ==> kmp_sched_trapezoidal       = 101
                                // will likely not used, introduced here just to debug the code
                                // of public intel extension schedules
};

#if KMP_OS_LINUX
enum clock_function_type __kmp_clock_function;
int __kmp_clock_function_param;
#endif /* KMP_OS_LINUX */

#if KMP_ARCH_X86_64 && (KMP_OS_LINUX || KMP_OS_WINDOWS)
enum mic_type __kmp_mic_type = non_mic;
#endif

#if KMP_AFFINITY_SUPPORTED

# if KMP_GROUP_AFFINITY

int __kmp_num_proc_groups = 1;

kmp_GetActiveProcessorCount_t __kmp_GetActiveProcessorCount = NULL;
kmp_GetActiveProcessorGroupCount_t __kmp_GetActiveProcessorGroupCount = NULL;
kmp_GetThreadGroupAffinity_t __kmp_GetThreadGroupAffinity = NULL;
kmp_SetThreadGroupAffinity_t __kmp_SetThreadGroupAffinity = NULL;

# endif /* KMP_GROUP_AFFINITY */

size_t   __kmp_affin_mask_size = 0;
enum affinity_type __kmp_affinity_type = affinity_default;
enum affinity_gran __kmp_affinity_gran = affinity_gran_default;
int __kmp_affinity_gran_levels  = -1;
int __kmp_affinity_dups = TRUE;
enum affinity_top_method __kmp_affinity_top_method = affinity_top_method_default;
int      __kmp_affinity_compact      = 0;
int      __kmp_affinity_offset       = 0;
int      __kmp_affinity_verbose      = FALSE;
int      __kmp_affinity_warnings     = TRUE;
int      __kmp_affinity_respect_mask = affinity_respect_mask_default;
char *   __kmp_affinity_proclist     = NULL;
kmp_affin_mask_t *__kmp_affinity_masks = NULL;
unsigned __kmp_affinity_num_masks    = 0;

char const *  __kmp_cpuinfo_file     = NULL;

#endif /* KMP_AFFINITY_SUPPORTED */

#if OMP_40_ENABLED
kmp_nested_proc_bind_t __kmp_nested_proc_bind = { NULL, 0, 0 };
int __kmp_affinity_num_places = 0;
#endif

int __kmp_place_num_cores = 0;
int __kmp_place_num_threads_per_core = 0;
int __kmp_place_core_offset = 0;

kmp_tasking_mode_t __kmp_tasking_mode = tskm_task_teams;

/* This check ensures that the compiler is passing the correct data type
 * for the flags formal parameter of the function kmpc_omp_task_alloc().
 * If the type is not a 4-byte type, then give an error message about
 * a non-positive length array pointing here.  If that happens, the
 * kmp_tasking_flags_t structure must be redefined to have exactly 32 bits.
 */
KMP_BUILD_ASSERT( sizeof(kmp_tasking_flags_t) == 4 );

kmp_int32 __kmp_task_stealing_constraint = 1;   /* Constrain task stealing by default */

#ifdef DEBUG_SUSPEND
int         __kmp_suspend_count = 0;
#endif

int     __kmp_settings = FALSE;
int     __kmp_duplicate_library_ok = 0;
#if USE_ITT_BUILD
int     __kmp_forkjoin_frames = 1;
int     __kmp_forkjoin_frames_mode = 0;
#endif
PACKED_REDUCTION_METHOD_T __kmp_force_reduction_method = reduction_method_not_defined;
int     __kmp_determ_red = FALSE;

#ifdef KMP_DEBUG
int     kmp_a_debug = 0;
int     kmp_b_debug = 0;
int     kmp_c_debug = 0;
int     kmp_d_debug = 0;
int     kmp_e_debug = 0;
int     kmp_f_debug = 0;
int     kmp_diag    = 0;
#endif

/* For debug information logging using rotating buffer */
int     __kmp_debug_buf = FALSE;        /* TRUE means use buffer, FALSE means print to stderr */
int     __kmp_debug_buf_lines = KMP_DEBUG_BUF_LINES_INIT; /* Lines of debug stored in buffer */
int     __kmp_debug_buf_chars = KMP_DEBUG_BUF_CHARS_INIT; /* Characters allowed per line in buffer */
int     __kmp_debug_buf_atomic = FALSE; /* TRUE means use atomic update of buffer entry pointer */

char   *__kmp_debug_buffer = NULL;      /* Debug buffer itself */
int     __kmp_debug_count = 0;          /* Counter for number of lines printed in buffer so far */
int     __kmp_debug_buf_warn_chars = 0; /* Keep track of char increase recommended in warnings */
/* end rotating debug buffer */

#ifdef KMP_DEBUG
int     __kmp_par_range;           /* +1 => only go par for constructs in range */
                                           /* -1 => only go par for constructs outside range */
char    __kmp_par_range_routine[KMP_PAR_RANGE_ROUTINE_LEN] = { '\0' };
char    __kmp_par_range_filename[KMP_PAR_RANGE_FILENAME_LEN] = { '\0' };
int     __kmp_par_range_lb = 0;
int     __kmp_par_range_ub = INT_MAX;
#endif /* KMP_DEBUG */

/* For printing out dynamic storage map for threads and teams */
int     __kmp_storage_map = FALSE;         /* True means print storage map for threads and teams */
int     __kmp_storage_map_verbose = FALSE; /* True means storage map includes placement info */
int     __kmp_storage_map_verbose_specified = FALSE;
/* Initialize the library data structures when we fork a child process, defaults to TRUE */
int     __kmp_need_register_atfork = TRUE; /* At initialization, call pthread_atfork to install fork handler */
int     __kmp_need_register_atfork_specified = TRUE;


int        __kmp_env_chunk       = FALSE;  /* KMP_CHUNK specified?     */
int        __kmp_env_stksize     = FALSE;  /* KMP_STACKSIZE specified? */
int        __kmp_env_omp_stksize = FALSE;  /* OMP_STACKSIZE specified? */
int        __kmp_env_all_threads     = FALSE;/* KMP_ALL_THREADS or KMP_MAX_THREADS specified? */
int        __kmp_env_omp_all_threads = FALSE;/* OMP_THREAD_LIMIT specified? */
int        __kmp_env_blocktime   = FALSE;  /* KMP_BLOCKTIME specified? */
int        __kmp_env_checks      = FALSE;  /* KMP_CHECKS specified?    */
int        __kmp_env_consistency_check  = FALSE;  /* KMP_CONSISTENCY_CHECK specified? */

kmp_uint32 __kmp_yield_init = KMP_INIT_WAIT;
kmp_uint32 __kmp_yield_next = KMP_NEXT_WAIT;
kmp_uint32 __kmp_yielding_on = 1;
#if KMP_OS_CNK
kmp_uint32 __kmp_yield_cycle = 0;
#else
kmp_uint32 __kmp_yield_cycle = 1;     /* Yield-cycle is on by default */
#endif
kmp_int32  __kmp_yield_on_count = 10; /* By default, yielding is on for 10 monitor periods. */
kmp_int32  __kmp_yield_off_count = 1; /* By default, yielding is off for 1 monitor periods. */
/* ----------------------------------------------------- */


/* ------------------------------------------------------ */
/* STATE mostly syncronized with global lock */
/* data written to rarely by masters, read often by workers */
/*
 * SHALL WE EDIT THE COMMENT BELOW IN SOME WAY?
 * TODO:  None of this global padding stuff works consistently because
 * the order of declaration is not necessarily correlated to storage order.
 * To fix this, all the important globals must be put in a big structure
 * instead.
 */
KMP_ALIGN_CACHE
         kmp_info_t **__kmp_threads     = NULL;
         kmp_root_t **__kmp_root        = NULL;

/* data read/written to often by masters */
KMP_ALIGN_CACHE
volatile int          __kmp_nth                    = 0;
volatile int          __kmp_all_nth                = 0;
int                   __kmp_thread_pool_nth        = 0;
volatile kmp_info_t  *__kmp_thread_pool            = NULL;
volatile kmp_team_t  *__kmp_team_pool              = NULL;

KMP_ALIGN_CACHE
volatile int          __kmp_thread_pool_active_nth = 0;

/* -------------------------------------------------
 * GLOBAL/ROOT STATE */
KMP_ALIGN_CACHE
kmp_global_t __kmp_global = {{ 0 }};

/* ----------------------------------------------- */
/* GLOBAL SYNCHRONIZATION LOCKS */
/* TODO verify the need for these locks and if they need to be global */

#if KMP_USE_INTERNODE_ALIGNMENT
/* Multinode systems have larger cache line granularity which can cause
 * false sharing if the alignment is not large enough for these locks */
KMP_ALIGN_CACHE_INTERNODE

kmp_bootstrap_lock_t __kmp_initz_lock   = KMP_BOOTSTRAP_LOCK_INITIALIZER( __kmp_initz_lock   ); /* Control initializations */
KMP_ALIGN_CACHE_INTERNODE
kmp_bootstrap_lock_t __kmp_forkjoin_lock; /* control fork/join access */
KMP_ALIGN_CACHE_INTERNODE
kmp_bootstrap_lock_t __kmp_exit_lock;   /* exit() is not always thread-safe */
KMP_ALIGN_CACHE_INTERNODE
kmp_bootstrap_lock_t __kmp_monitor_lock; /* control monitor thread creation */
KMP_ALIGN_CACHE_INTERNODE
kmp_bootstrap_lock_t __kmp_tp_cached_lock; /* used for the hack to allow threadprivate cache and __kmp_threads expansion to co-exist */

KMP_ALIGN_CACHE_INTERNODE
kmp_lock_t __kmp_global_lock;           /* Control OS/global access */
KMP_ALIGN_CACHE_INTERNODE
kmp_queuing_lock_t __kmp_dispatch_lock;         /* Control dispatch access  */
KMP_ALIGN_CACHE_INTERNODE
kmp_lock_t __kmp_debug_lock;            /* Control I/O access for KMP_DEBUG */
#else
KMP_ALIGN_CACHE

kmp_bootstrap_lock_t __kmp_initz_lock   = KMP_BOOTSTRAP_LOCK_INITIALIZER( __kmp_initz_lock   ); /* Control initializations */
kmp_bootstrap_lock_t __kmp_forkjoin_lock; /* control fork/join access */
kmp_bootstrap_lock_t __kmp_exit_lock;   /* exit() is not always thread-safe */
kmp_bootstrap_lock_t __kmp_monitor_lock; /* control monitor thread creation */
kmp_bootstrap_lock_t __kmp_tp_cached_lock; /* used for the hack to allow threadprivate cache and __kmp_threads expansion to co-exist */

KMP_ALIGN(128)
kmp_lock_t __kmp_global_lock;           /* Control OS/global access */
KMP_ALIGN(128)
kmp_queuing_lock_t __kmp_dispatch_lock;         /* Control dispatch access  */
KMP_ALIGN(128)
kmp_lock_t __kmp_debug_lock;            /* Control I/O access for KMP_DEBUG */
#endif

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

#if KMP_HANDLE_SIGNALS
    /*
        Signal handling is disabled by default, because it confuses users: In case of sigsegv
        (or other trouble) in user code signal handler catches the signal, which then "appears" in
        the monitor thread (when the monitor executes raise() function). Users see signal in the
        monitor thread and blame OpenMP RTL.

        Grant said signal handling required on some older OSes (Irix?) supported by KAI, because
        bad applications hung but not aborted. Currently it is not a problem for Linux* OS, OS X* and
        Windows* OS.

        Grant: Found new hangs for EL4, EL5, and a Fedora Core machine.  So I'm putting
        the default back for now to see if that fixes hangs on those machines.

        2010-04013 Lev: It was a bug in Fortran RTL. Fortran RTL prints a kind of stack backtrace
        when program is aborting, but the code is not signal-safe. When multiple signals raised at
        the same time (which occurs in dynamic negative tests because all the worker threads detects
        the same error), Fortran RTL may hang. The bug finally fixed in Fortran RTL library provided
        by Steve R., and will be available soon.
    */
    int __kmp_handle_signals = FALSE;
#endif

/* ----------------------------------------------- */
#ifdef BUILD_TV
kmp_key_t __kmp_tv_key = 0;
#endif

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

#ifdef DEBUG_SUSPEND
int
get_suspend_count_( void ) {
    int count = __kmp_suspend_count;
    __kmp_suspend_count = 0;
    return count;
}
void
set_suspend_count_( int * value ) {
    __kmp_suspend_count = *value;
}
#endif

// Symbols for MS mutual detection.
int _You_must_link_with_exactly_one_OpenMP_library = 1;
int _You_must_link_with_Intel_OpenMP_library       = 1;
#if KMP_OS_WINDOWS && ( KMP_VERSION_MAJOR > 4 )
    int _You_must_link_with_Microsoft_OpenMP_library = 1;
#endif

// end of file //