RunLoop流程
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Entry
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BeforeTimers
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BeforeSource0
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DoBlocks
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DoSource0 -> DoBlocks
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如果存在Source1, 则走AfterWaiting后的逻辑
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BeforeWaiting
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AfterWaiting
处理Timer
服务CGD: Async to Main Queue
处理Source1
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DoBlocks
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根据前面的执行结果
回到第二步
或者
Exit
关于Source0
处理Touch Event
performSelector:onThread:
关于Source1
基于port的线程通信
捕捉系统事件
关于Timers
NSTimer
performSelector:withObject:afterDelay:
关于 observers
监听RunLoop的状态
UI刷新（BeforeWaiting）
Autoreleas pool (当前loop BeforeWaiting时释放autorelease对象)
RunLoop数据结构
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typedef struct __CFRunLoop* CFRunLoopRef;
struct __CFRunloop {
CFRunLoopModeRef _currentMode;
CFMutableSetRef _commonModes;
CFMutableSetRef _commonModeItems;
CFMutableSetRef _modes;
CFAbsoluteTime _runtime;
CFAbsoluteTime _sleepTime;
CFTypeRef _counterpart;
pthread_t _pthread;
__CFPort _wakeUpPort; //used for CFRunLoopWakeUp
Boolean _unused;
pthread_mutex_t _lock // locked fro accessing mode list
}
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typedef struct __CFRunLoopMode *CFRunLoopModeRef;
struct __CFRunLoopMode {
CFStringRef _name;
CFMutableSetRef _sources0; // CFRunLoopSourceRef
CFMutableSetRef _sources1; // CFRunLoopSourceRef
CFMutableArrayRef _observers;// CFRunLoopObserverRef
CFMutableArrayRef _timers;// CFRunLoopTimerRef
}