通道总是在以下两个进程间同步：阅读器和写入器。
A channel always synchronizes between just two processes: the reader and the writer.
通道不是进程间同步的惟一可用选择，也不总是最合适的选择。
Channels aren't the only available option for synchronization between processes, nor are they always the most appropriate.
用于进程间同步的数据结构。信号灯常常由操作系统提供。
A data structure that is used for intertask synchronization. Semaphores are usually provided by the operating system.
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