In some implementations, threads may occasionally wake up without a signal sent to their condition variable.

在有些实现中，线程可能偶尔在没有信号送到条件变量的情况下醒过来。

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This example shows what can happen if a signal handler runs in the middle of modifying a variable.

这个例子展示了在修改某个变量的过程中运行信号处理器可能会发生什么事情？

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The is_dumping global variable is used to stop other threads from changing the contents of the buffer once a signal has been received to dump data.

一旦接收到了转储数据的信号，将使用 is_dumping 全局变量禁止其他的线程更改该缓冲区的内容。

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It has been discovered that the Airwave radio system's signal is variable on the ground floor.

BBC: Suffolk Police radio fault at Landmark House in Ipswich

The increase in fulfillment centers can be viewed as an investment in future growth and perhaps margins assuming better efficiencies, but an increase in variable costs per revenue can signal permanently declining margins.

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