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1// This test verifies that dispatch_sync() doesn't actually copy the block under TSan (without TSan, it doesn't).2 3// RUN: %clang_tsan %s -o %t_no_tsan -framework Foundation -fno-sanitize=thread4// RUN: %clang_tsan %s -o %t_with_tsan -framework Foundation5 6// RUN: %run %t_no_tsan 2>&1 | FileCheck %s7// RUN: %run %t_with_tsan 2>&1 | FileCheck %s8 9#import <Foundation/Foundation.h>10 11@interface MyClass : NSObject12@end13 14@implementation MyClass15- (instancetype)retain {16 // Copying the dispatch_sync'd block below will increment the retain count of17 // this object. Abort if that happens.18 abort();19}20@end21 22int main(int argc, const char* argv[]) {23 dispatch_queue_t q = dispatch_queue_create("my.queue", NULL);24 id object = [[MyClass alloc] init];25 void (^block)(void) = ^ {26 NSLog(@"%@", object);27 };28 dispatch_sync(q, ^{29 NSLog(@"%@", object);30 });31 dispatch_sync(q, block);32 [object release];33 NSLog(@"Done.");34 return 0;35}36 37// CHECK: Done.38// CHECK-NOT: WARNING: ThreadSanitizer39