1// RUN: %clang_tsan %s -o %t -framework Foundation
2// RUN: %env_tsan_opts=ignore_interceptors_accesses=1 %run %t 2>&1 | FileCheck %s
3
4#import <Foundation/Foundation.h>
5
6long my_global = 0;
7
8int main(int argc, const char *argv[]) {
9  fprintf(stderr, "Hello world.\n");
10
11  dispatch_queue_t queue = dispatch_queue_create("my.queue", DISPATCH_QUEUE_SERIAL);
12  dispatch_semaphore_t sem = dispatch_semaphore_create(0);
13
14  NSString *path = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"temp-gcd-io.%d", getpid()]];
15
16  dispatch_io_t channel = dispatch_io_create_with_path(DISPATCH_IO_STREAM, path.fileSystemRepresentation, O_CREAT | O_WRONLY,
17      0666, queue, ^(int error) { });
18  dispatch_io_set_high_water(channel, 1);
19
20  NSData *ns_data = [NSMutableData dataWithLength:1000];
21  dispatch_data_t data = dispatch_data_create(ns_data.bytes, ns_data.length, NULL, DISPATCH_DATA_DESTRUCTOR_DEFAULT);
22
23  my_global++;
24  dispatch_io_write(channel, 0, data, queue, ^(bool done, dispatch_data_t remainingData, int error) {
25    my_global++;
26    dispatch_async(queue, ^{
27      my_global++;
28      if (done) {
29        dispatch_semaphore_signal(sem);
30      }
31    });
32  });
33
34  dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
35  my_global++;
36  dispatch_io_close(channel, 0);
37  channel = dispatch_io_create_with_path(DISPATCH_IO_STREAM, path.fileSystemRepresentation, O_RDONLY,
38      0, queue, ^(int error) { });
39  dispatch_io_set_high_water(channel, 1);
40
41  my_global++;
42  dispatch_io_read(channel, 0, SIZE_MAX, queue, ^(bool done, dispatch_data_t remainingData, int error) {
43    my_global++;
44    dispatch_async(queue, ^{
45      my_global++;
46      if (done) {
47        dispatch_semaphore_signal(sem);
48      }
49    });
50  });
51
52  dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
53  my_global++;
54  fprintf(stderr, "Done.\n");
55  return 0;
56}
57
58// CHECK: Hello world.
59// CHECK-NOT: WARNING: ThreadSanitizer
60// CHECK: Done.
61