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