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#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <dlfcn.h>
#include <stddef.h>
// TSan-invisible barrier.
// Tests use it to establish necessary execution order in a way that does not
// interfere with tsan (does not establish synchronization between threads).
__typeof(pthread_barrier_wait) *barrier_wait;
void barrier_init(pthread_barrier_t *barrier, unsigned count) {
if (barrier_wait == 0) {
void *h = dlopen("libpthread.so.0", RTLD_LAZY);
if (h == 0) {
fprintf(stderr, "failed to dlopen libpthread.so.0, exiting\n");
exit(1);
}
barrier_wait = (__typeof(barrier_wait))dlsym(h, "pthread_barrier_wait");
if (barrier_wait == 0) {
fprintf(stderr, "failed to resolve pthread_barrier_wait, exiting\n");
exit(1);
}
}
pthread_barrier_init(barrier, 0, count);
}
// Default instance of the barrier, but a test can declare more manually.
pthread_barrier_t barrier;
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