296ce3bd23
Objective-C's @synchronize synchronization primitive uses calls to objc_sync_enter and objc_sync_exit runtime functions. In most cases, they end up just calling pthread_mutex_lock/pthread_mutex_unlock, but there are some cases where the synchronization from pthread_mutex_lock/pthread_mutex_unlock interceptors isn't enough. Let's add explicit interceptors for objc_sync_enter and objc_sync_exit to handle all cases. Differential Revision: https://reviews.llvm.org/D45487 llvm-svn: 329982
58 lines
1.1 KiB
Plaintext
58 lines
1.1 KiB
Plaintext
// RUN: %clangxx_tsan %s -o %t -framework Foundation -fobjc-arc %darwin_min_target_with_full_runtime_arc_support
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// RUN: %run %t 2>&1 | FileCheck %s
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#import <Foundation/Foundation.h>
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@interface MyClass : NSObject {
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long field;
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}
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@property (nonatomic, readonly) long value;
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@end
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dispatch_group_t group;
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@implementation MyClass
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- (void) start {
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dispatch_queue_t q = dispatch_queue_create(NULL, NULL);
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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for (int i = 0; i < 1000; i++) {
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dispatch_async(q, ^{
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@synchronized(self) {
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self->field = i;
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}
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});
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}
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});
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}
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- (long) value {
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@synchronized(self) {
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return self->field;
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}
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}
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- (void)dealloc {
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dispatch_group_leave(group);
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}
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@end
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int main() {
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group = dispatch_group_create();
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@autoreleasepool {
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for (int j = 0; j < 100; ++j) {
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dispatch_group_enter(group);
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MyClass *obj = [[MyClass alloc] init];
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[obj start];
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long x = obj.value;
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(void)x;
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}
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}
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dispatch_group_wait(group, DISPATCH_TIME_FOREVER);
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NSLog(@"Hello world");
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}
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// CHECK: Hello world
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// CHECK-NOT: WARNING: ThreadSanitizer
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