1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
// RUN: %clang_tsan %s -o %t
// RUN: %deflake %run %t 2>&1 | FileCheck %s
#include "dispatch/dispatch.h"
#include "../test.h"
long global;
int main() {
fprintf(stderr, "Hello world.\n");
print_address("addr=", 1, &global);
dispatch_semaphore_t done = dispatch_semaphore_create(0);
barrier_init(&barrier, 2);
dispatch_queue_t q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT);
dispatch_queue_t bgq = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_barrier_sync(q, ^{
global = 42;
});
dispatch_async(bgq, ^{
dispatch_sync(q, ^{
global = 43;
barrier_wait(&barrier);
});
});
dispatch_async(bgq, ^{
dispatch_sync(q, ^{
barrier_wait(&barrier);
global = 44;
dispatch_semaphore_signal(done);
});
});
dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
fprintf(stderr, "Done.\n");
}
// CHECK: Hello world.
// CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
// CHECK: WARNING: ThreadSanitizer: data race
// CHECK: Location is global 'global' {{(of size 8 )?}}at [[ADDR]] (barrier-race.c.tmp+0x{{[0-9,a-f]+}})
// CHECK: Done.
|
