| 1 | // RUN: %clangxx_tsan %s -o %t -framework Foundation -fobjc-arc |
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| 2 | // RUN: %run %t 2>&1 | FileCheck %s |
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| 3 | |
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| 4 | #import <Foundation/Foundation.h> |
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| 5 | |
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| 6 | @interface MyClass : NSObject { |
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| 7 | long field; |
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| 8 | } |
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| 9 | @property (nonatomic, readonly) long value; |
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| 10 | @end |
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| 11 | |
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| 12 | dispatch_group_t group; |
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| 13 | |
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| 14 | @implementation MyClass |
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| 15 | |
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| 16 | - (void) start { |
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| 17 | dispatch_queue_t q = dispatch_queue_create(NULL, NULL); |
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| 18 | dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ |
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| 19 | for (int i = 0; i < 1000; i++) { |
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| 20 | dispatch_async(q, ^{ |
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| 21 | @synchronized(self) { |
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| 22 | self->field = i; |
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| 23 | } |
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| 24 | }); |
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| 25 | } |
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| 26 | }); |
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| 27 | } |
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| 28 | |
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| 29 | - (long) value { |
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| 30 | @synchronized(self) { |
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| 31 | return self->field; |
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| 32 | } |
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| 33 | } |
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| 34 | |
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| 35 | - (void)dealloc { |
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| 36 | dispatch_group_leave(group); |
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| 37 | } |
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| 38 | |
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| 39 | @end |
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| 40 | |
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| 41 | int main() { |
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| 42 | group = dispatch_group_create(); |
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| 43 | @autoreleasepool { |
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| 44 | for (int j = 0; j < 100; ++j) { |
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| 45 | dispatch_group_enter(group); |
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| 46 | MyClass *obj = [[MyClass alloc] init]; |
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| 47 | [obj start]; |
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| 48 | long x = obj.value; |
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| 49 | (void)x; |
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| 50 | } |
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| 51 | } |
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| 52 | dispatch_group_wait(group, DISPATCH_TIME_FOREVER); |
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| 53 | NSLog(@"Hello world" ); |
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| 54 | } |
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| 55 | |
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| 56 | // CHECK: Hello world |
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| 57 | // CHECK-NOT: WARNING: ThreadSanitizer |
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| 58 | |
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