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26 lines
780 B
26 lines
780 B
5 years ago
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Looper 的副业
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---
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```c++
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int addFd(int fd, int ident, int events, sp<LooperCallback>& callback, ...){
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epoll_ctl(mEpollFd, EPOLL_CTL_ADD, fd, &eventItem);
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}
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void NativeMessageQueue::setFileDescriptorEvents(int fd, int events){
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mLooper->addFd(fd, Looper::POLL_CALLBACK, looperEvents, this, reinterpret_cast<void*>(events));
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}
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void addOnFileDescriptorEventListener(FileDescriptor fd, int events, OnFileDescriptorEventListener listener){...}
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```
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Framework 里面有哪些地方用到了副业？
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```c++
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status_t NativeDisplayEventReceiver::initialize(){
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mMessageQueue->getLooper()->addFd(mReceiver.getFd(), 0, EVENT_INPUT, this, NULL);
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}
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```
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#### 总结
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1. Looper 里可以监听其他描述符
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2. 创建管道，跨进程传数据，用 Looper 监听描述符事件
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