The main thread writes bytes read from the channel into the pipe.
主线程把从通道读取的数据写到管道中。
All of these callbacks happen on the main thread of the application.
这些回调全部发生在应用程序的主线程上。
Now the result of the request must be made available to the main thread.
现在，请求的结果必须在主线程中可用。
Main thread: Call pthread_create .
主线程：调用pthread_create 。
Main thread: Call pthread_create .
主线程：调用pthread_create 。
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