-(voID)concurrentMethod { static NSThread *runningThread = nil; NSThread *myThread = [NSThread currentThread]; if (runningThread != nil) { NSLog(@"Thread %@: running concurrently with %@",runningThread,myThread); } runningThread = myThread; ... // Do the useful stuff here if (runningThread != myThread) { NSLog(@"Thread %@: pre-empted by %@",myThread,runningThread); } runningThread = nil;}总结
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