1 // RUN: %clang_tsan %s -o %t
2 // RUN: %deflake %run %t 2>&1 | FileCheck %s
3
4 #include <dispatch/dispatch.h>
5
6 #import "../test.h"
7
8 dispatch_queue_t queue;
9 dispatch_data_t data;
10 dispatch_semaphore_t sem;
11 const char *path;
12
13 long my_global = 0;
14
main(int argc,const char * argv[])15 int main(int argc, const char *argv[]) {
16 fprintf(stderr, "Hello world.\n");
17 print_address("addr=", 1, &my_global);
18 barrier_init(&barrier, 2);
19
20 queue = dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT);
21 sem = dispatch_semaphore_create(0);
22 path = tempnam(NULL, "libdispatch-io-barrier-race-");
23 char buf[1000];
24 data = dispatch_data_create(buf, sizeof(buf), NULL, DISPATCH_DATA_DESTRUCTOR_DEFAULT);
25
26 dispatch_io_t channel = dispatch_io_create_with_path(DISPATCH_IO_STREAM, path, O_CREAT | O_WRONLY, 0666, queue, ^(int error) { });
27 if (! channel) abort();
28 dispatch_io_set_high_water(channel, 1);
29
30 dispatch_io_write(channel, 0, data, queue, ^(bool done, dispatch_data_t remainingData, int error) {
31 if (error) abort();
32 my_global = 42;
33 barrier_wait(&barrier);
34 });
35
36 dispatch_io_barrier(channel, ^{
37 barrier_wait(&barrier);
38 my_global = 43;
39
40 dispatch_semaphore_signal(sem);
41 });
42
43 dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
44 dispatch_io_close(channel, 0);
45
46 fprintf(stderr, "Done.\n");
47 return 0;
48 }
49
50 // CHECK: Hello world.
51 // CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
52 // CHECK: WARNING: ThreadSanitizer: data race
53 // CHECK: Location is global 'my_global' {{(of size 8 )?}}at [[ADDR]] (io-barrier-race.c.tmp+0x{{[0-9,a-f]+}})
54 // CHECK: Done.
55