compiler-rt/test/tsan/libdispatch/blocks.c

   1 // RUN: %clang_tsan %s -o %t
   2 // RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'
   3
   4 #include "dispatch/dispatch.h"
   5
   6 #include <stdio.h>
   7 #include <assert.h>
   8
   9 int main() {
  10   fprintf(stderr, "start\n");
  11   dispatch_semaphore_t done = dispatch_semaphore_create(0);
  12
  13   dispatch_queue_t background_q = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
  14   dispatch_queue_t serial_q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_SERIAL);
  15   assert(background_q != serial_q);
  16
  17   dispatch_async(background_q, ^{
  18     __block long block_var = 0;
  19
  20     dispatch_sync(serial_q, ^{
  21       block_var = 42;
  22     });
  23
  24     fprintf(stderr, "block_var = %ld\n", block_var);
  25
  26     dispatch_semaphore_signal(done);
  27   });
  28
  29   dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
  30   fprintf(stderr, "done\n");
  31 }
  32
  33 // CHECK: start
  34 // CHECK: block_var = 42
  35 // CHECK: done