只有当超时周期过期时，而且读取消息的应用程序没有删除它，消息才会重新出现在队列中。
The message will only reappear in the queue when the timeout period expires if, and only if, it has not been deleted by the reading process.
超时让您可以确保此值总是可以重新读取自您的数据中心。
The timeout allows you to ensure that the value is always reread from your data source.
在从队列中读取消息之后，队列的其他所有消费者就看不到这个消息，直到可见性超时周期过期为止。
When you read a message from a queue, that message automatically becomes invisible to all other consumers of the queue until the visibility timeout period set for the queue expires.
这种并发性控制可以极大地减少读取程序和写入程序访问相同的数据行时产生的超时情况。
This concurrency control can greatly reduce timeout situations between readers and writers accessing the same data row.
有趣的是，Ruby1.9.0对CPU的占有率最低，其实现采用了 readpartial：“不对socket读取设置超时”，同时“提前为每次读取分配字符串缓存”。
Interestingly, Ruby 1.9.0 has the lowest CPU usage, with an implementation that uses readpartial, "no timeout for socket reads" and "pre-allocated String buffer for each read".
因此，如果希望拥有自己的 Schroedinger盒，那么只需使用Tie::Scalar::Timeout模块和一个0 到 100之间的随机超时，并在50秒时读取 $k变量值。
Thus, if you want your own Schroedinger box, just use the Tie::Scalar::Timeout module with a random timeout between 0 and 100, and read the value at 50 seconds.
为连接和读取指定超时时间的能力。
如果读取的是URL并且套接字由于不再有任何数据可以读取而超时，则feof也将返回False。
Note that feof also returns False if you're reading a URL and the socket has timed out because you no longer have data to read.
当接收消息的应用程序从队列中读取一个消息时，指定可见性超时值(以秒为单位)。
A visibility timeout value, in seconds, is specified when the receiving application reads a message from a queue. This ACTS more like a lock and ensures that, for the specified time period.
尝试进入读取模式锁定状态，可以选择整数超时时间。
Tries to enter the lock in read mode, with an optional integer time-out.
客户端数据读超时配置，客户端停止读取数据，超时时间后断开相应连接，默认是60秒。
If the client stops reading data, free up the stale client connection after this much time. Default 60.
客户端数据读超时配置，客户端停止读取数据，超时时间后断开相应连接，默认是60秒。
If the client stops reading data, free up the stale client connection after this much time. Default 60.
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