compiler-rt/test/tsan/libdispatch/async-race.c

   1 // RUN: %clang_tsan %s -o %t
   2 // RUN: %deflake %run %t 2>&1 | FileCheck %s
   3
   4 #include "dispatch/dispatch.h"
   5
   6 #include "../test.h"
   7
   8 long global;
   9
  10 int main() {
  11   fprintf(stderr, "Hello world.\n");
  12   print_address("addr=", 1, &global);
  13   dispatch_semaphore_t done = dispatch_semaphore_create(0);
  14   barrier_init(&barrier, 2);
  15
  16   global = 42;
  17   dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
  18     global = 43;
  19     barrier_wait(&barrier);
  20   });
  21
  22   dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
  23     barrier_wait(&barrier);
  24     global = 44;
  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: Hello world.
  34 // CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
  35 // CHECK: WARNING: ThreadSanitizer: data race
  36 // CHECK: Location is global 'global' {{(of size 8 )?}}at [[ADDR]] (async-race.c.tmp+0x{{[0-9,a-f]+}})
  37 // CHECK: Done.