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 6dispatch_queue_t queue; 7dispatch_data_t data; 8dispatch_semaphore_t sem; 9const char *path; 10 11long my_global = 0; 12 13int main(int argc, const char *argv[]) { 14 fprintf(stderr, "Hello world.\n"); 15 16 queue = dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT); 17 sem = dispatch_semaphore_create(0); 18 NSString *ns_path = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"temp-gcd-io.%d", getpid()]]; 19 path = ns_path.fileSystemRepresentation; 20 NSData *ns_data = [NSMutableData dataWithLength:1000]; 21 data = dispatch_data_create(ns_data.bytes, ns_data.length, NULL, DISPATCH_DATA_DESTRUCTOR_DEFAULT); 22 23 dispatch_io_t channel = dispatch_io_create_with_path(DISPATCH_IO_STREAM, path, O_CREAT | O_WRONLY, 0666, queue, ^(int error) { }); 24 if (! channel) abort(); 25 dispatch_io_set_high_water(channel, 1); 26 27 for (int i = 0; i < 1000; i++) { 28 dispatch_io_barrier(channel, ^{ 29 my_global = 42; 30 }); 31 } 32 33 dispatch_io_barrier(channel, ^{ 34 my_global = 43; 35 36 dispatch_semaphore_signal(sem); 37 }); 38 39 dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER); 40 dispatch_io_close(channel, 0); 41 42 fprintf(stderr, "Done.\n"); 43 return 0; 44} 45 46// CHECK: Hello world. 47// CHECK-NOT: WARNING: ThreadSanitizer 48// CHECK: Done. 49