llvm/compiler-rt/test/tsan/benign_race.cpp

// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
#include "test.h"

int Global;
int WTFGlobal;

void *Thread(void *x) {
  Global = 42;
  WTFGlobal = 142;
  barrier_wait(&barrier);
  return 0;
}

int main() {
  barrier_init(&barrier, 2);
  ANNOTATE_BENIGN_RACE(Global);
  WTF_ANNOTATE_BENIGN_RACE(WTFGlobal);
  pthread_t t;
  pthread_create(&t, 0, Thread, 0);
  barrier_wait(&barrier);
  Global = 43;
  WTFGlobal = 143;
  pthread_join(t, 0);
  fprintf(stderr, "OK\n");
}

// CHECK-NOT: WARNING: ThreadSanitizer: data race