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207
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1 // RUN: %clangxx_tsan %s -o %t -framework Foundation -fobjc-arc
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150
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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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