AMessage post方法的处理流程

Amessage post方法的处理流程
1.AMessage::post(int64_t delayUs)
call gLooperRoster.postMessage(this, delayUs)

2.ALooperRoster::postMessage
call postMessage_l(msg, delayUs)

3.ALooperRoster::postMessage_l
call looper->post(msg, delayUs)

4.ALooper::post
call mEventQueue.insert(it, event);
insert message into mEventQueue list

Event的定义：
struct Event {
int64_t mWhenUs;
sp<AMessage> mMessage;
};


mEventQueue的声明：
List<Event> mEventQueue;