监听对象释放。优化log输出#4
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通过log分析，得出以下结论，帮我们深入了解线程长活问题
//总结：test At: xcode8,ios 9.3.4
//1,当用CFRunLoopRun(),然后调用CFRunLoopStop，此方法是后果会输出current thread，thread dealloc，current thread，thread dealloc ...所以不会用内存问题
//2,当用 [runLoop run];,然后调用CFRunLoopStop,此方法会current thread，current thread，... 最后输出[NSThread start]: Thread creation failed with error 35.然后app卡住，然后app crash. 内存不会暴增。但是线程无法销毁
//3,当用 [runLoop runMode:NSRunLoopCommonModes beforeDate:[NSDate distantFuture]];,然后调用CFRunLoopStop,此方法会。[ViewController performSelector:onThread:withObject:waitUntilDone:modes:]: target thread exited while waiting for the perform' crash。是因为 [runLoop runMode:NSRunLoopCommonModes beforeDate:[NSDate distantFuture]]; 无法阻塞线程，所以线程很快执行完run 方法。然后线程exit，导致奔溃（在一个退出的线程，当然这个时候线程没有释放，执行方法奔溃）