Chapter 7. Wait Queues `include/linux/wait.h`
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## Chapter 7. Wait Queues `include/linux/wait.h`

[SLEEPS]

A wait queue is used to wait for someone to wake you up when a certain condition is true. They must be used carefully to ensure there is no race condition. You declare a wait_queue_head_t, and then processes which want to wait for that condition declare a wait_queue_t referring to themselves, and place that in the queue.

## Declaring

You declare a wait_queue_head_t using the `DECLARE_WAIT_QUEUE_HEAD()` macro, or using the `init_waitqueue_head()` routine in your initialization code.

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