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1// RUN: %clang_tsan %s -o %t2// RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'3 4#include <dispatch/dispatch.h>5 6#include <stdio.h>7 8void notify_callback(void *context) {9  // Do nothing.10}11 12int 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.44