31 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.");12 13 global = 42;14 15 dispatch_semaphore_t sem = dispatch_semaphore_create(0);16 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{17 18 global = 43;19 dispatch_semaphore_signal(sem);20 });21 22 dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);23 global = 44;24 25 fprintf(stderr, "Done.");26 return 0;27}28 29// CHECK: Hello world.30// CHECK: Done.31