chromium messageloop
Android 平台下：
MessageLoop::Run
|MessagePump(this)::Run
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MessagePumpAndroid(UI线程) MessagePumpLibevent(IO线程) MessagePumpDefault(其他线程)
(自定义task和UI消息) (自定义task和IO消息) (自定义task)
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DoWork
DoDelayedWork
DoIdleWork
1. 自定义task
MessageLoop::PostTask(task)
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| ---> incoming_queue_.push(task) （自定义task queue）
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| ---> message_loop_->ScheduleWork() | ---> MessagePumpAndroid::ScheduleWork ---> Java_SystemMessageHandler_setTimer()
| ---> MessagePumpLibevent::ScheduleWork ---> write(wakeup_pipe_in_, &buf, 1)
| ---> MessagePumpDefault::ScheduleWork ---> WaitableEvent.Signal()
2. render进程向browser进程发消息
bool RenderWidget::Send(IPC::Message* msg)
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RenderThreadImpl::Send(IPC::Message* msg)
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ChildThread::Send(IPC::Message* msg)
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SyncChannel::Send(IPC::Message* msg)
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ChannelProxy::Send(msg)
3. browser进程向render进程发消息
bool RenderWidgetHostImpl::Send(IPC::Message* msg)
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bool RenderProcessHostImpl::Send(IPC::Message* msg)
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ipc_task_runner()->PostTask(ChannelProxy::Context::OnSendMessage)
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ChannelProxy::Context::OnSendMessage
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bool Channel::ChannelImpl::Send(Message* message)
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| ---> output_queue_.push(message)
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| ---> Channel::ChannelImpl::ProcessOutgoingMessages() ---> write(pipe_, out_bytes, amt_to_write)