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休眠为什么要用等待队列？
来源: 互联网 发布时间：2017-04-22
本文导语: 休眠为什么要用等待队列？不用等待队列不是一样可以休眠么？？ | 参考深入理解linux内核 Wait queues have several uses in the kernel, particularly for interrupt handling, process synchronization, and timing...
休眠为什么要用等待队列？不用等待队列不是一样可以休眠么？？
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参考深入理解linux内核
Wait queues have several uses in the kernel, particularly for interrupt handling, process synchronization, and timing. We'll just say here that a process must often wait for some event to occur, such as for a disk operation to terminate, a system resource to be released, or a fixed interval of time to elapse.Wait queues implement conditional waits on events: a process wishing to wait for a specific event places itself in the proper wait queue and relinquishes control. Therefore, a wait queue represents a set of sleeping processes, which are woken up by the kernel when some condition becomes true.
等待队列除了让进程休眠之外，实现了事件上的条件等待: 希望等待特定事件的进程把自己放进合适的等待队列
Wait queues have several uses in the kernel, particularly for interrupt handling, process synchronization, and timing. We'll just say here that a process must often wait for some event to occur, such as for a disk operation to terminate, a system resource to be released, or a fixed interval of time to elapse.Wait queues implement conditional waits on events: a process wishing to wait for a specific event places itself in the proper wait queue and relinquishes control. Therefore, a wait queue represents a set of sleeping processes, which are woken up by the kernel when some condition becomes true.
等待队列除了让进程休眠之外，实现了事件上的条件等待: 希望等待特定事件的进程把自己放进合适的等待队列
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