1 // RUN: %clang_tsan %s -o %t -framework Foundation 2 // RUN: %run %t 2>&1 3 4 #import <Foundation/Foundation.h> 5 6 void notify_callback(void *context) { 7 // Do nothing. 8 } 9 10 int main() { 11 NSLog(@"Hello world."); 12 13 dispatch_queue_t q = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); 14 15 for (int i = 0; i < 300000; i++) { 16 dispatch_group_t g = dispatch_group_create(); 17 dispatch_group_enter(g); 18 dispatch_async(q, ^{ 19 dispatch_group_leave(g); 20 }); 21 dispatch_group_notify(g, q, ^{ 22 // Do nothing. 23 }); 24 dispatch_release(g); 25 } 26 27 for (int i = 0; i < 300000; i++) { 28 dispatch_group_t g = dispatch_group_create(); 29 dispatch_group_enter(g); 30 dispatch_async(q, ^{ 31 dispatch_group_leave(g); 32 }); 33 dispatch_group_notify_f(g, q, nullptr, ¬ify_callback); 34 dispatch_release(g); 35 } 36 37 NSLog(@"Done."); 38 } 39 40 // CHECK: Hello world. 41 // CHECK: Done. 42 // CHECK-NOT: WARNING: ThreadSanitizer 43 // CHECK-NOT: CHECK failed 44
