sk_wait_data

[Valdis.Kletnieks at vt.edu]

On Thu, 19 Feb 2015 23:45:44 +0100, Grzegorz Dwornicki said:

> How does the kernel know when to "unblock" the process? Function name:
> sk_wait_data and macro name: sk_wait_event tells me that there should
> be some queue checning from time to time...

No need to check the queue from time to time.  Just wait - and *when data
arrives*, poke the queue to wake it up (or when the timeout hits).
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