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#import <Foundation/Foundation.h> 5 6#import "../test.h" 7 8dispatch_queue_t queue; 9dispatch_data_t data; 10dispatch_semaphore_t sem; 11const char *path; 12 13long my_global = 0; 14 15int 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 NSString *ns_path = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"temp-gcd-io.%d", getpid()]]; 23 path = ns_path.fileSystemRepresentation; 24 NSData *ns_data = [NSMutableData dataWithLength:1000]; 25 data = dispatch_data_create(ns_data.bytes, ns_data.length, NULL, DISPATCH_DATA_DESTRUCTOR_DEFAULT); 26 27 dispatch_io_t channel = dispatch_io_create_with_path(DISPATCH_IO_STREAM, path, O_CREAT | O_WRONLY, 0666, queue, ^(int error) { }); 28 if (! channel) abort(); 29 dispatch_io_set_high_water(channel, 1); 30 31 dispatch_io_write(channel, 0, data, queue, ^(bool done, dispatch_data_t remainingData, int error) { 32 if (error) abort(); 33 my_global = 42; 34 barrier_wait(&barrier); 35 }); 36 37 dispatch_io_barrier(channel, ^{ 38 barrier_wait(&barrier); 39 my_global = 43; 40 41 dispatch_semaphore_signal(sem); 42 }); 43 44 dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER); 45 dispatch_io_close(channel, 0); 46 47 fprintf(stderr, "Done.\n"); 48 return 0; 49} 50 51// CHECK: Hello world. 52// CHECK: addr=[[ADDR:0x[0-9,a-f]+]] 53// CHECK: WARNING: ThreadSanitizer: data race 54// CHECK: Location is global 'my_global' {{(of size 8 )?}}at [[ADDR]] (gcd-io-barrier-race.mm.tmp+0x{{[0-9,a-f]+}}) 55// CHECK: Done. 56