1 // RUN: %clang_tsan %s -o %t
2 // RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'
3 
4 #include <dispatch/dispatch.h>
5 
6 #include <stdio.h>
7 #include <string.h>
8 
9 long global = 42;
10 
11 int main(int argc, const char *argv[]) {
12   fprintf(stderr, "Hello world.\n");
13 
14   dispatch_queue_t q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_SERIAL);
15   dispatch_semaphore_t sem = dispatch_semaphore_create(0);
16 
17   const char *buffer = "buffer";
18   size_t size = strlen(buffer);
19 
20   dispatch_data_t data = dispatch_data_create(buffer, size, q, ^{
21     fprintf(stderr, "Data destructor.\n");
22     global++;
23 
24     dispatch_semaphore_signal(sem);
25   });
26   dispatch_release(data);
27 
28   dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
29 
30   data = dispatch_data_create(buffer, size, q, DISPATCH_DATA_DESTRUCTOR_DEFAULT);
31   dispatch_release(data);
32 
33   fprintf(stderr, "Done.\n");
34 }
35 
36 // CHECK: Hello world.
37 // CHECK: Data destructor.
38 // CHECK: Done.
39