Re: [PATCH 2/3] ipc/sem.c: handle spurious wakeups

[Andrew Morton]

On Sat, 24 Sep 2011 19:37:11 +0200
Manfred Spraul <manfred@xxxxxxxxxxxxxxxx> wrote:

> semtimedop() does not handle spurious wakeups, it returns -EINTR to user space.
> Most other schedule() users would just loop and not return to user space.
> The patch adds such a loop to semtimedop()

What is a "spurious wakeup" and how can a process receive one?

I'm wondering about the userspace-visible effects of this change, and
any compatibility issues?


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