compiler-rt/test/tsan/libdispatch/groups-stress.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
   8 void notify_callback(void *context) {
   9   // Do nothing.
  10 }
  11
  12 int main() {
  13   fprintf(stderr, "Hello world.");
  14
  15   dispatch_queue_t q = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
  16
  17   for (int i = 0; i < 300000; i++) {
  18     dispatch_group_t g = dispatch_group_create();
  19     dispatch_group_enter(g);
  20     dispatch_async(q, ^{
  21       dispatch_group_leave(g);
  22     });
  23     dispatch_group_notify(g, q, ^{
  24       // Do nothing.
  25     });
  26     dispatch_release(g);
  27   }
  28
  29   for (int i = 0; i < 300000; i++) {
  30     dispatch_group_t g = dispatch_group_create();
  31     dispatch_group_enter(g);
  32     dispatch_async(q, ^{
  33       dispatch_group_leave(g);
  34     });
  35     dispatch_group_notify_f(g, q, NULL, &notify_callback);
  36     dispatch_release(g);
  37   }
  38
  39   fprintf(stderr, "Done.");
  40 }
  41
  42 // CHECK: Hello world.
  43 // CHECK: Done.