linux-kernel - Can I call kthread_should_stop() from user-space tasks?

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Message-ID: <1319207130.31815.498615@m31.gerwinski.de>
Date:	Fri, 21 Oct 2011 16:25:30 +0200
From:	Frank Heckenbach <f.heckenbach@...soft.de>
To:	linux-kernel@...r.kernel.org
Subject: Can I call kthread_should_stop() from
	user-space tasks?

Hi,

is it permissible to call kthread_should_stop() from normal
user-space tasks (looking at kthread.c I suppose not), and if not,
is there a way to find out whether the current task is a kthread?

Reason I'm asking, I have a function that's called from both
kthreads and user-space tasks which calls
wait_event_interruptible(). If it's a kthread I want to add
"|| kthread_should_stop()" to the condition so it can be stopped
with kthread_stop() while waiting, but of course I don't want to
break user-space tasks by calling kthread_should_stop() if it's
invalid.
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