And, if there is no value available in the inbox, the RDCH instruction simply stalls until there is one.
而且，如果在收件箱没有可用数据，rdch指令就会一直暂停，直到可用数据出现。
Thus, when you try to read the channel using RDCH, it will block until the status is available, at which point the transfer will be complete.
这样，当试图使用rdch读取信道时，它将会一直阻塞，直到状态可用为止，只有在这时，传输才会完成。
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