gcc/testsuite/c-c++-common/tsan/tsan_barrier.h

/* TSAN-invisible barriers.  Link with -ldl.  */
#include <pthread.h>
#include <dlfcn.h>

static __typeof(pthread_barrier_wait) *barrier_wait;

static
void barrier_init (pthread_barrier_t *barrier, unsigned count)
{
  void *h = dlopen ("libpthread.so.0", RTLD_LAZY);
  barrier_wait = (__typeof (pthread_barrier_wait) *)
	 	 dlsym (h, "pthread_barrier_wait");
  pthread_barrier_init (barrier, NULL, count);
}