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

   1 // RUN: %clang_tsan %s -o %t -framework Foundation
   2 // RUN: %run %t 2>&1 | FileCheck %s
   3
   4 #import <Foundation/Foundation.h>
   5
   6 dispatch_queue_t queue;
   7 dispatch_data_t data;
   8 dispatch_semaphore_t sem;
   9 const char *path;
  10
  11 long my_global = 0;
  12
  13 int 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.