55 lines · c
1// RUN: %clang_tsan %s -o %t2// RUN: %deflake %run %t 2>&1 | FileCheck %s3 4#include <dispatch/dispatch.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 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 race53// 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