27 lines · c
1// RUN: %clang_tsan %s -o %t2// RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'3 4#include "dispatch/dispatch.h"5 6#include <stdio.h>7 8long global;9 10int main() {11 fprintf(stderr, "Hello world.\n");12 dispatch_semaphore_t done = dispatch_semaphore_create(0);13 14 global = 42;15 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{16 global = 43;17 18 dispatch_semaphore_signal(done);19 });20 21 dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);22 fprintf(stderr, "Done.\n");23}24 25// CHECK: Hello world.26// CHECK: Done.27