The user-mode application requests to read/write from some device, i. e. makes I/O operation.

的用户模式应用程序请求读取某些设备/写，即让I / O操作。

youdao

So, if a thread is blocked in an I/O operation on a channel, another thread can close that channel.

所以，如果一个线程在某条通道的 I/O 操作上阻塞时，那么另一个线程可以将这条通道关闭。

youdao

res is the usual result of an I/O operation: the number of bytes transfered, or a negative error code.

res是IO操作的通常结果：传输的字节数，或者负值的错误码。

youdao

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