1// RUN: %clangxx_tsan %s -o %t -framework Foundation -fobjc-arc 2// RUN: %run %t 2>&1 | FileCheck %s 3 4#import <Foundation/Foundation.h> 5 6NSString *tagged_string = nil; 7 8@interface MyClass : NSObject { 9 long field; 10} 11@property(nonatomic, readonly) long value; 12@end 13 14dispatch_group_t group; 15 16@implementation MyClass 17 18- (void)start { 19 dispatch_queue_t q = dispatch_queue_create(NULL, NULL); 20 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 21 for (int i = 0; i < 10; i++) { 22 dispatch_async(q, ^{ 23 @synchronized(tagged_string) { 24 self->field = i; 25 } 26 }); 27 } 28 }); 29} 30 31- (long)value { 32 @synchronized(tagged_string) { 33 return self->field; 34 } 35} 36 37- (void)dealloc { 38 dispatch_group_leave(group); 39} 40 41@end 42 43int main() { 44 tagged_string = [NSString stringWithFormat:@"%s", "abc"]; 45 uintptr_t tagged_string_bits = (uintptr_t)tagged_string; 46 assert((tagged_string_bits & 0x8000000000000001ull) != 0); 47 group = dispatch_group_create(); 48 @autoreleasepool { 49 for (int j = 0; j < 100; ++j) { 50 dispatch_group_enter(group); 51 MyClass *obj = [[MyClass alloc] init]; 52 [obj start]; 53 long x = obj.value; 54 (void)x; 55 } 56 } 57 dispatch_group_wait(group, DISPATCH_TIME_FOREVER); 58 NSLog(@"Hello world"); 59} 60 61// CHECK: Hello world 62// CHECK-NOT: WARNING: ThreadSanitizer 63