compiler-rt/test/tsan/race_on_barrier2.c

   1 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2
   3 // pthread barriers are not available on OS X
   4 // UNSUPPORTED: darwin
   5
   6 #include <pthread.h>
   7 #include <stdio.h>
   8 #include <stddef.h>
   9 #include <unistd.h>
  10
  11 pthread_barrier_t B;
  12 int Global;
  13
  14 void *Thread1(void *x) {
  15   if (pthread_barrier_wait(&B) == PTHREAD_BARRIER_SERIAL_THREAD)
  16     pthread_barrier_destroy(&B);
  17   return NULL;
  18 }
  19
  20 void *Thread2(void *x) {
  21   if (pthread_barrier_wait(&B) == PTHREAD_BARRIER_SERIAL_THREAD)
  22     pthread_barrier_destroy(&B);
  23   return NULL;
  24 }
  25
  26 int main() {
  27   pthread_barrier_init(&B, 0, 2);
  28   pthread_t t;
  29   pthread_create(&t, NULL, Thread1, NULL);
  30   Thread2(0);
  31   pthread_join(t, NULL);
  32   return 0;
  33 }
  34
  35 // CHECK:      WARNING: ThreadSanitizer: data race