xref: /llvm-project/compiler-rt/test/tsan/libdispatch/serial-queue-norace.c (revision a59dad920ffb7a01f8e275ac4b6596048621fd20)
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 
8 long global;
9 
main()10 int main() {
11   fprintf(stderr, "Hello world.\n");
12   dispatch_semaphore_t done = dispatch_semaphore_create(0);
13 
14   dispatch_queue_t q1 = dispatch_queue_create("my.queue1", DISPATCH_QUEUE_CONCURRENT);
15   dispatch_queue_t q2 = dispatch_queue_create("my.queue2", DISPATCH_QUEUE_SERIAL);
16 
17   global = 42;
18   for (int i = 0; i < 10; i++) {
19     dispatch_async(q1, ^{
20       for (int i = 0; i < 100; i++) {
21         dispatch_sync(q2, ^{
22           global++;
23         });
24       }
25     });
26   }
27 
28   dispatch_barrier_async(q1, ^{
29     dispatch_semaphore_signal(done);
30   });
31 
32   dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
33   fprintf(stderr, "Done.\n");
34 }
35 
36 // CHECK: Hello world.
37 // CHECK: Done.
38