exp-drd/drd_pthread_intercepts.c

/*--------------------------------------------------------------------*/
/*--- Client-space code for drd.                  drd_intercepts.c ---*/
/*--------------------------------------------------------------------*/

/*
  This file is part of drd, a data race detector.

  Copyright (C) 2006-2008 Bart Van Assche
  bart.vanassche@gmail.com

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of the
  License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  02111-1307, USA.

  The GNU General Public License is contained in the file COPYING.
*/

/* ---------------------------------------------------------------------
   ALL THE CODE IN THIS FILE RUNS ON THE SIMULATED CPU. 

   These functions are not called directly - they're the targets of code
   redirection or load notifications (see pub_core_redir.h for info).
   They're named weirdly so that the intercept code can find them when the
   shared object is initially loaded.

   Note that this filename has the "drd_" prefix because it can appear
   in stack traces, and the "drd_" makes it a little clearer that it
   originates from Valgrind.
   ------------------------------------------------------------------ */

// Make sure pthread_spinlock_t is available when compiling with older glibc
// versions (2.3 or before).
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

#include <assert.h>
#include <inttypes.h>       // uintptr_t
#include <pthread.h>
#include <semaphore.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>         // confstr()
#include "config.h"
#include "drd_clientreq.h"
#include "pub_tool_redir.h"


// Defines.

#define PTH_FUNC(ret_ty, f, args...)                            \
  ret_ty VG_WRAP_FUNCTION_ZZ(libpthreadZdsoZd0,f)(args);        \
  ret_ty VG_WRAP_FUNCTION_ZZ(libpthreadZdsoZd0,f)(args)


/* Local data structures. */

typedef struct
{
  void* (*start)(void*);
  void* arg;
  int   detachstate;
#if 0
  pthread_mutex_t mutex;
  pthread_cond_t  cond;
#else
  int wrapper_started;
#endif
} VgPosixThreadArgs;


/* Function declarations. */

void _init(void);
static void check_threading_library(void);
static void vg_set_main_thread_state(void);


/* Function definitions. */

/** Shared library initialization function: the _init() function is called
 *  after dlopen() has loaded the shared library. This function must not
 *  be declared static.
 */
void _init(void)
{
  check_threading_library();
  vg_set_main_thread_state();
  /* glibc up to and including version 2.7 triggers conflicting accesses   */
  /* on stdout and stderr when sending output to one of these streams from */
  /* more than one thread. Suppress data race reports on these objects.    */
  DRD_IGNORE_VAR(*stdout);
  DRD_IGNORE_VAR(*stderr);
}

static MutexT pthread_to_drd_mutex_type(const int kind)
{
  switch (kind)
  {
    /* PTHREAD_MUTEX_RECURSIVE_NP */
  case PTHREAD_MUTEX_RECURSIVE:
    return mutex_type_recursive_mutex;
    /* PTHREAD_MUTEX_ERRORCHECK_NP */
  case PTHREAD_MUTEX_ERRORCHECK:
    return mutex_type_errorcheck_mutex;
    /* PTHREAD_MUTEX_TIMED_NP */
    /* PTHREAD_MUTEX_NORMAL */
  case PTHREAD_MUTEX_DEFAULT:
  case PTHREAD_MUTEX_ADAPTIVE_NP:
    return mutex_type_default_mutex;
  }
  return mutex_type_invalid_mutex;
}

static MutexT mutex_type(pthread_mutex_t* mutex)
{
#if defined(HAVE_PTHREAD_MUTEX_T__M_KIND)
  /* LinuxThreads. */
  const int kind = mutex->__m_kind;
#elif defined(HAVE_PTHREAD_MUTEX_T__DATA__KIND)
  /* NPTL. */
  const int kind = mutex->__data.__kind;
#else
  /* Another POSIX threads implementation. Regression tests will fail. */
  const int kind = PTHREAD_MUTEX_DEFAULT;
  fprintf(stderr,
          "Did not recognize your POSIX threads implementation. Giving up.\n");
  assert(0);
#endif
  return pthread_to_drd_mutex_type(kind);
}

static void vg_start_suppression(const void* const p, size_t const size)
{
  int res;
  VALGRIND_DO_CLIENT_REQUEST(res, 0, VG_USERREQ__DRD_START_SUPPRESSION,
                             p, size, 0, 0, 0);
}

static void vg_set_joinable(const pthread_t tid, const int joinable)
{
  int res;
  assert(joinable == 0 || joinable == 1);
  VALGRIND_DO_CLIENT_REQUEST(res, 0, VG_USERREQ__SET_JOINABLE,
                             tid, joinable, 0, 0, 0);
}

static void* vg_thread_wrapper(void* arg)
{
  int res;

  VALGRIND_DO_CLIENT_REQUEST(res, 0, VG_USERREQ__DRD_SUPPRESS_CURRENT_STACK,
                             0, 0, 0, 0, 0);

  {
    VgPosixThreadArgs* const arg_ptr = (VgPosixThreadArgs*)arg;
    VgPosixThreadArgs const arg_copy = *arg_ptr;
    void* result;

#if 0
    pthread_mutex_lock(arg_ptr->mutex);
    pthread_cond_signal(arg_ptr->cond);
    pthread_mutex_unlock(arg_ptr->mutex);
#else
    arg_ptr->wrapper_started = 1;
#endif

    VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__SET_PTHREADID,
                               pthread_self(), 0, 0, 0, 0);
    vg_set_joinable(pthread_self(),
                    arg_copy.detachstate == PTHREAD_CREATE_JOINABLE);
    result = (arg_copy.start)(arg_copy.arg);
    return result;
  }
}

/** Return 1 if LinuxThread has been detected, and 0 otherwise. */
static int detected_linuxthreads(void)
{
#if defined(linux)
#if defined(_CS_GNU_LIBPTHREAD_VERSION)
  /* Linux with a recent glibc. */
  char buffer[256];
  unsigned len;
  len = confstr(_CS_GNU_LIBPTHREAD_VERSION, buffer, sizeof(buffer));
  assert(len <= sizeof(buffer));
  return len > 0 && buffer[0] == 'l';
#else
  /* Linux without _CS_GNU_LIBPTHREAD_VERSION: most likely LinuxThreads. */
  return 1;
#endif
#else
  /* Another OS than Linux, hence no LinuxThreads. */
  return 0;
#endif
}

/** Stop and print an error message in case a non-supported threading
 *  library (LinuxThreads) has been detected.
 */
static void check_threading_library(void)
{
  if (detected_linuxthreads())
  {
    if (getenv("LD_ASSUME_KERNEL"))
    {
      fprintf(stderr,
              "Detected the LinuxThreads threading library. Sorry, but DRD only supports\n"
              "the newer NPTL (Native POSIX Threads Library). Please try to rerun DRD\n"
              "after having unset the environment variable LD_ASSUME_KERNEL. Giving up.\n"
              );
    }
    else
    {
      fprintf(stderr,
              "Detected the LinuxThreads threading library. Sorry, but DRD only supports\n"
              "the newer NPTL (Native POSIX Threads Library). Please try to rerun DRD\n"
              "after having upgraded to a newer version of your Linux distribution.\n"
              "Giving up.\n"
              );
    }
    abort();
  }
}

static void vg_set_main_thread_state(void)
{
  int res;

  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__DRD_SUPPRESS_CURRENT_STACK,
                             0, 0, 0, 0, 0);

  // Make sure that DRD knows about the main thread's POSIX thread ID.
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__SET_PTHREADID,
                             pthread_self(), 0, 0, 0, 0);

}

// pthread_create
PTH_FUNC(int, pthreadZucreateZa, // pthread_create*
         pthread_t *thread, const pthread_attr_t *attr,
         void *(*start) (void *), void *arg)
{
  int    res;
  int    ret;
  OrigFn fn;
  VgPosixThreadArgs vgargs;

  VALGRIND_GET_ORIG_FN(fn);

  vg_start_suppression(&vgargs.wrapper_started,
                       sizeof(vgargs.wrapper_started));
  vgargs.start = start;
  vgargs.arg   = arg;
  vgargs.wrapper_started = 0;
  vgargs.detachstate = PTHREAD_CREATE_JOINABLE;
  if (attr)
  {
    if (pthread_attr_getdetachstate(attr, &vgargs.detachstate) != 0)
    {
      assert(0);
    }
  }
  assert(vgargs.detachstate == PTHREAD_CREATE_JOINABLE
         || vgargs.detachstate == PTHREAD_CREATE_DETACHED);
#if 0
  pthread_mutex_init(&vgargs.mutex, 0);
  pthread_cond_init(&vgargs.cond, 0);
  pthread_mutex_lock(&vgargs.mutex);
#endif
  /* Suppress NPTL-specific conflicts between creator and created thread. */
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__DRD_STOP_RECORDING,
                             0, 0, 0, 0, 0);
  CALL_FN_W_WWWW(ret, fn, thread, attr, vg_thread_wrapper, &vgargs);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__DRD_START_RECORDING,
                             0, 0, 0, 0, 0);
#if 0
  pthread_cond_wait(&vgargs.cond, &vgargs.mutex);
  pthread_mutex_unlock(&vgargs.mutex);
  pthread_cond_destroy(&vgargs.cond);
  pthread_mutex_destroy(&vgargs.mutex);
#else
  // Yes, you see it correctly, busy waiting ... The problem is that
  // POSIX threads functions cannot be called here -- the functions defined
  // in this file (drd_intercepts.c) would be called instead of those in
  // libpthread.so. This loop is necessary because vgargs is allocated on the
  // stack, and the created thread reads it.
  if (ret == 0)
  {
    while (! vgargs.wrapper_started)
    {
      sched_yield();
    }
  }
#endif
  return ret;
}

// pthread_join
PTH_FUNC(int, pthreadZujoin, // pthread_join
         pthread_t pt_joinee, void **thread_return)
{
  int      ret;
  int      res;
  OrigFn   fn;

  VALGRIND_GET_ORIG_FN(fn);
  CALL_FN_W_WW(ret, fn, pt_joinee, thread_return);
  if (ret == 0)
  {
    VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_THREAD_JOIN,
                               pt_joinee, 0, 0, 0, 0);
  }
  return ret;
}

// pthread_detach
PTH_FUNC(int, pthreadZudetach, pthread_t pt_thread)
{
  int ret;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  {
    CALL_FN_W_W(ret, fn, pt_thread);
    if (ret == 0)
    {
      vg_set_joinable(pt_thread, 0);
    }
  }
  return ret;
}

// pthread_mutex_init
PTH_FUNC(int, pthreadZumutexZuinit,
         pthread_mutex_t *mutex,
         const pthread_mutexattr_t* attr)
{
  int ret;
  int res;
  OrigFn fn;
  int mt;
  VALGRIND_GET_ORIG_FN(fn);
  mt = PTHREAD_MUTEX_DEFAULT;
  if (attr)
    pthread_mutexattr_gettype(attr, &mt);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_MUTEX_INIT,
                             mutex, pthread_to_drd_mutex_type(mt), 0, 0, 0);
  CALL_FN_W_WW(ret, fn, mutex, attr);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_MUTEX_INIT,
                             mutex, 0, 0, 0, 0);
  return ret;
}

// pthread_mutex_destroy
PTH_FUNC(int, pthreadZumutexZudestroy,
         pthread_mutex_t *mutex)
{
  int ret;
  int res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_MUTEX_DESTROY,
                             mutex, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, mutex);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_MUTEX_DESTROY,
                             mutex, mutex_type(mutex), 0, 0, 0);
  return ret;
}

// pthread_mutex_lock
PTH_FUNC(int, pthreadZumutexZulock, // pthread_mutex_lock
         pthread_mutex_t *mutex)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, 0, VG_USERREQ__PRE_MUTEX_LOCK,
                             mutex, mutex_type(mutex), 0, 0, 0);
  CALL_FN_W_W(ret, fn, mutex);
  VALGRIND_DO_CLIENT_REQUEST(res, 0, VG_USERREQ__POST_MUTEX_LOCK,
                             mutex, ret == 0, 0, 0, 0);
  return ret;
}

// pthread_mutex_trylock
PTH_FUNC(int, pthreadZumutexZutrylock, // pthread_mutex_trylock
         pthread_mutex_t *mutex)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, 0, VG_USERREQ__PRE_MUTEX_LOCK,
                             mutex, mutex_type(mutex), 1, 0, 0);
  CALL_FN_W_W(ret, fn, mutex);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_MUTEX_LOCK,
                             mutex, ret == 0, 0, 0, 0);
  return ret;
}

// pthread_mutex_timedlock
PTH_FUNC(int, pthreadZumutexZutimedlock, // pthread_mutex_timedlock
         pthread_mutex_t *mutex,
         const struct timespec *abs_timeout)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, 0, VG_USERREQ__PRE_MUTEX_LOCK,
                             mutex, mutex_type(mutex), 0, 0, 0);
  CALL_FN_W_WW(ret, fn, mutex, abs_timeout);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_MUTEX_LOCK,
                             mutex, ret == 0, 0, 0, 0);
  return ret;
}

// pthread_mutex_unlock
PTH_FUNC(int, pthreadZumutexZuunlock, // pthread_mutex_unlock
         pthread_mutex_t *mutex)
{
  int ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1,
                             VG_USERREQ__PRE_MUTEX_UNLOCK,
                             mutex, mutex_type(mutex), 0, 0, 0);
  CALL_FN_W_W(ret, fn, mutex);
  VALGRIND_DO_CLIENT_REQUEST(res, -1,
                             VG_USERREQ__POST_MUTEX_UNLOCK,
                             mutex, 0, 0, 0, 0);
  return ret;
}

// pthread_cond_init
PTH_FUNC(int, pthreadZucondZuinitZa, // pthread_cond_init*
         pthread_cond_t* cond,
         const pthread_condattr_t* attr)
{
  int ret;
  int res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_COND_INIT,
                             cond, 0, 0, 0, 0);
  CALL_FN_W_WW(ret, fn, cond, attr);
  return ret;
}

// pthread_cond_destroy
PTH_FUNC(int, pthreadZucondZudestroyZa, // pthread_cond_destroy*
         pthread_cond_t* cond)
{
  int ret;
  int res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  CALL_FN_W_W(ret, fn, cond);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_COND_DESTROY,
                             cond, 0, 0, 0, 0);
  return ret;
}

// pthread_cond_wait
PTH_FUNC(int, pthreadZucondZuwaitZa, // pthread_cond_wait*
         pthread_cond_t *cond,
         pthread_mutex_t *mutex)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_COND_WAIT,
                             cond, mutex, mutex_type(mutex), 0, 0);
  CALL_FN_W_WW(ret, fn, cond, mutex);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_COND_WAIT,
                             cond, mutex, 1, 0, 0);
  return ret;
}

// pthread_cond_timedwait
PTH_FUNC(int, pthreadZucondZutimedwaitZa, // pthread_cond_timedwait*
         pthread_cond_t *cond,
         pthread_mutex_t *mutex,
         const struct timespec* abstime)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_COND_WAIT,
                             cond, mutex, mutex_type(mutex), 0, 0);
  CALL_FN_W_WWW(ret, fn, cond, mutex, abstime);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_COND_WAIT,
                             cond, mutex, 1, 0, 0);
  return ret;
}

// pthread_cond_signal
PTH_FUNC(int, pthreadZucondZusignalZa, // pthread_cond_signal*
         pthread_cond_t* cond)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_COND_SIGNAL,
                             cond, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, cond);
  return ret;
}

// pthread_cond_broadcast
PTH_FUNC(int, pthreadZucondZubroadcastZa, // pthread_cond_broadcast*
         pthread_cond_t* cond)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_COND_BROADCAST,
                             cond, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, cond);
  return ret;
}


// pthread_spin_init
PTH_FUNC(int, pthreadZuspinZuinit, // pthread_spin_init
         pthread_spinlock_t *spinlock,
         int pshared)
{
  int ret;
  int res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__SPIN_INIT_OR_UNLOCK,
                             spinlock, mutex_type_spinlock, 0, 0, 0);
  CALL_FN_W_WW(ret, fn, spinlock, pshared);
  return ret;
}

// pthread_spin_destroy
PTH_FUNC(int, pthreadZuspinZudestroy, // pthread_spin_destroy
         pthread_spinlock_t *spinlock)
{
  int ret;
  int res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  CALL_FN_W_W(ret, fn, spinlock);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_MUTEX_DESTROY,
                             spinlock, mutex_type_spinlock, 0, 0, 0);
  return ret;
}

// pthread_spin_lock
PTH_FUNC(int, pthreadZuspinZulock, // pthread_spin_lock
         pthread_spinlock_t *spinlock)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, 0, VG_USERREQ__PRE_MUTEX_LOCK,
                             spinlock, mutex_type_spinlock, 0, 0, 0);
  CALL_FN_W_W(ret, fn, spinlock);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_MUTEX_LOCK,
                             spinlock, ret == 0, 0, 0, 0);
  return ret;
}

// pthread_spin_trylock
PTH_FUNC(int, pthreadZuspinZutrylock, // pthread_spin_trylock
         pthread_spinlock_t *spinlock)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, 0, VG_USERREQ__PRE_MUTEX_LOCK,
                             spinlock, mutex_type_spinlock, 0, 0, 0);
  CALL_FN_W_W(ret, fn, spinlock);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_MUTEX_LOCK,
                             spinlock, ret == 0, 0, 0, 0);
  return ret;
}

// pthread_spin_unlock
PTH_FUNC(int, pthreadZuspinZuunlock, // pthread_spin_unlock
         pthread_spinlock_t *spinlock)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__SPIN_INIT_OR_UNLOCK,
                             spinlock, mutex_type_spinlock, 0, 0, 0);
  CALL_FN_W_W(ret, fn, spinlock);
  return ret;
}

// pthread_barrier_init
PTH_FUNC(int, pthreadZubarrierZuinit, // pthread_barrier_init
         pthread_barrier_t* barrier,
         const pthread_barrierattr_t* attr,
         unsigned count)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_BARRIER_INIT,
                             barrier, pthread_barrier, count, 0, 0);
  CALL_FN_W_WWW(ret, fn, barrier, attr, count);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_BARRIER_INIT,
                             barrier, pthread_barrier, 0, 0, 0);
  return ret;
}

// pthread_barrier_destroy
PTH_FUNC(int, pthreadZubarrierZudestroy, // pthread_barrier_destroy
         pthread_barrier_t* barrier)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_BARRIER_DESTROY,
                             barrier, pthread_barrier, 0, 0, 0);
  CALL_FN_W_W(ret, fn, barrier);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_BARRIER_DESTROY,
                             barrier, pthread_barrier, 0, 0, 0);
  return ret;
}

// pthread_barrier_wait
PTH_FUNC(int, pthreadZubarrierZuwait, // pthread_barrier_wait
         pthread_barrier_t* barrier)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_BARRIER_WAIT,
                             barrier, pthread_barrier, 0, 0, 0);
  CALL_FN_W_W(ret, fn, barrier);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_BARRIER_WAIT,
                             barrier, pthread_barrier,
                             ret == 0 || ret == PTHREAD_BARRIER_SERIAL_THREAD,
                             0, 0);
  return ret;
}


// sem_init
PTH_FUNC(int, semZuinitZa, // sem_init*
         sem_t *sem,
         int pshared,
         unsigned int value)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_SEM_INIT,
                             sem, pshared, value, 0, 0);
  CALL_FN_W_WWW(ret, fn, sem, pshared, value);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_SEM_INIT,
                             sem, 0, 0, 0, 0);
  return ret;
}

// sem_destroy
PTH_FUNC(int, semZudestroyZa, // sem_destroy*
         sem_t *sem)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_SEM_DESTROY,
                             sem, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, sem);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_SEM_DESTROY,
                             sem, 0, 0, 0, 0);
  return ret;
}

// sem_wait
PTH_FUNC(int, semZuwaitZa, // sem_wait*
         sem_t *sem)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_SEM_WAIT,
                             sem, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, sem);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_SEM_WAIT,
                             sem, ret == 0, 0, 0, 0);
  return ret;
}

// sem_trywait
PTH_FUNC(int, semZutrywaitZa, // sem_trywait*
         sem_t *sem)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_SEM_WAIT,
                             sem, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, sem);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_SEM_WAIT,
                             sem, ret == 0, 0, 0, 0);
  return ret;
}

// sem_timedwait
PTH_FUNC(int, semZutimedwait, // sem_timedwait
         sem_t *sem, const struct timespec *abs_timeout)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_SEM_WAIT,
                             sem, 0, 0, 0, 0);
  CALL_FN_W_WW(ret, fn, sem, abs_timeout);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_SEM_WAIT,
                             sem, ret == 0, 0, 0, 0);
  return ret;
}

// sem_post
PTH_FUNC(int, semZupostZa, // sem_post*
         sem_t *sem)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_SEM_POST,
                             sem, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, sem);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_SEM_POST,
                             sem, ret == 0, 0, 0, 0);
  return ret;
}

// pthread_rwlock_init
PTH_FUNC(int,
         pthreadZurwlockZuinitZa, // pthread_rwlock_init*
         pthread_rwlock_t* rwlock,
         const pthread_rwlockattr_t* attr)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_RWLOCK_INIT,
                             rwlock, 0, 0, 0, 0);
  CALL_FN_W_WW(ret, fn, rwlock, attr);
  return ret;
}

// pthread_rwlock_destroy
PTH_FUNC(int,
         pthreadZurwlockZudestroyZa, // pthread_rwlock_destroy*
         pthread_rwlock_t* rwlock)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  CALL_FN_W_W(ret, fn, rwlock);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_RWLOCK_DESTROY,
                             rwlock, 0, 0, 0, 0);
  return ret;
}

// pthread_rwlock_rdlock
PTH_FUNC(int,
         pthreadZurwlockZurdlockZa, // pthread_rwlock_rdlock*
         pthread_rwlock_t* rwlock)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_RWLOCK_RDLOCK,
                             rwlock, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, rwlock);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_RWLOCK_RDLOCK,
                             rwlock, ret == 0, 0, 0, 0);
  return ret;
}

// pthread_rwlock_wrlock
PTH_FUNC(int,
         pthreadZurwlockZuwrlockZa, // pthread_rwlock_wrlock*
         pthread_rwlock_t* rwlock)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_RWLOCK_WRLOCK,
                             rwlock, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, rwlock);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_RWLOCK_WRLOCK,
                             rwlock, ret == 0, 0, 0, 0);
  return ret;
}

// pthread_rwlock_timedrdlock
PTH_FUNC(int,
         pthreadZurwlockZutimedrdlockZa, // pthread_rwlock_timedrdlock*
         pthread_rwlock_t* rwlock)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_RWLOCK_RDLOCK,
                             rwlock, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, rwlock);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_RWLOCK_RDLOCK,
                             rwlock, ret == 0, 0, 0, 0);
  return ret;
}

// pthread_rwlock_timedwrlock
PTH_FUNC(int,
         pthreadZurwlockZutimedwrlockZa, // pthread_rwlock_timedwrlock*
         pthread_rwlock_t* rwlock)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_RWLOCK_WRLOCK,
                             rwlock, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, rwlock);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_RWLOCK_WRLOCK,
                             rwlock, ret == 0, 0, 0, 0);
  return ret;
}

// pthread_rwlock_tryrdlock
PTH_FUNC(int,
         pthreadZurwlockZutryrdlockZa, // pthread_rwlock_tryrdlock*
         pthread_rwlock_t* rwlock)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_RWLOCK_RDLOCK,
                             rwlock, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, rwlock);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_RWLOCK_RDLOCK,
                             rwlock, ret == 0, 0, 0, 0);
  return ret;
}

// pthread_rwlock_trywrlock
PTH_FUNC(int,
         pthreadZurwlockZutrywrlockZa, // pthread_rwlock_trywrlock*
         pthread_rwlock_t* rwlock)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_RWLOCK_WRLOCK,
                             rwlock, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, rwlock);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_RWLOCK_WRLOCK,
                             rwlock, ret == 0, 0, 0, 0);
  return ret;
}

// pthread_rwlock_unlock
PTH_FUNC(int,
         pthreadZurwlockZuunlockZa, // pthread_rwlock_unlock*
         pthread_rwlock_t* rwlock)
{
  int   ret;
  int   res;
  OrigFn fn;
  VALGRIND_GET_ORIG_FN(fn);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__PRE_RWLOCK_UNLOCK,
                             rwlock, 0, 0, 0, 0);
  CALL_FN_W_W(ret, fn, rwlock);
  VALGRIND_DO_CLIENT_REQUEST(res, -1, VG_USERREQ__POST_RWLOCK_UNLOCK,
                             rwlock, ret == 0, 0, 0, 0);
  return ret;
}