compiler-rt/test/tsan/libdispatch/barrier-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   dispatch_queue_t q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT);
  17   dispatch_queue_t bgq = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
  18
  19   dispatch_barrier_sync(q, ^{
  20     global = 42;
  21   });
  22
  23   dispatch_async(bgq, ^{
  24     dispatch_sync(q, ^{
  25       global = 43;
  26       barrier_wait(&barrier);
  27     });
  28   });
  29
  30   dispatch_async(bgq, ^{
  31     dispatch_sync(q, ^{
  32       barrier_wait(&barrier);
  33       global = 44;
  34
  35       dispatch_semaphore_signal(done);
  36     });
  37   });
  38
  39   dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
  40   fprintf(stderr, "Done.\n");
  41 }
  42
  43 // CHECK: Hello world.
  44 // CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
  45 // CHECK: WARNING: ThreadSanitizer: data race
  46 // CHECK: Location is global 'global' {{(of size 8 )?}}at [[ADDR]] (barrier-race.c.tmp+0x{{[0-9,a-f]+}})
  47 // CHECK: Done.