37 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 10static const long nIter = 1000;11 12int main() {13 fprintf(stderr, "Hello world.\n");14 dispatch_semaphore_t done = dispatch_semaphore_create(0);15 16 dispatch_queue_t serial_q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_SERIAL);17 18 global = 42;19 for (int i = 0; i < nIter; i++) {20 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{21 dispatch_sync(serial_q, ^{22 global = i;23 24 if (i == nIter - 1) {25 dispatch_semaphore_signal(done);26 }27 });28 });29 }30 31 dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);32 fprintf(stderr, "Done.\n");33}34 35// CHECK: Hello world.36// CHECK: Done.37