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。
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。
This input/output (I/O) operation is time-consuming, compared with the amount of time required to access data that’s already in computer memory.
与访问已经在计算机内存中的数据相比，这种输入/输出 (I/O)操作非常耗时。
The I/O module was also designed to provide high-level instruction set, which greatly simplified the I/O operation of RF IC cards.
模块设计有用户高级读写指令，极大地简化了应用系统对射频卡的操作；
The new architecture of embed browser lower-layer successfully decoupled the executing relationship between lower-layer modules, and improved the efficiency of network I/O operation.
在此基础上设计并实现的浏览器底层架构，有效减少了各个模块之间互相牵制的可能性，提高浏览器网络I/O操作的效率。
The PostQueuedCompletionStatus function allows an application to queue its own special-purpose I/O completion packets to the completion port without starting an asynchronous I/O operation.
PostQueuedCompletionStatus函数允许应用程序可以针对自定义的专用I/O完成包进行排队，而无需启动一个异步I/O操作。
The PostQueuedCompletionStatus function allows an application to queue its own special-purpose I/O completion packets to the completion port without starting an asynchronous I/O operation.
PostQueuedCompletionStatus函数允许应用程序可以针对自定义的专用I/O完成包进行排队，而无需启动一个异步I/O操作。
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