src/compiler-rt/test/tsan/Darwin/gcd-io-race.mm

   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
  10 dispatch_queue_t queue;
  11 dispatch_data_t data;
  12 dispatch_semaphore_t sem;
  13 const char *path;
  14
  15 long my_global = 0;
  16
  17 int 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.