From: "Alexey Shinkin" <alexshinkin@hotmail.com>
To: linux-kernel@vger.kernel.org
Subject: Re: questions on wait_event ...
Date: Fri, 23 Dec 2005 07:46:17 +0600 [thread overview]
Message-ID: <BAY16-F260F9C6F509BFC683D3A6AF330@phx.gbl> (raw)
In-Reply-To: <1135300240.12761.27.camel@localhost.localdomain>
Look:
We call wait_event() , condition is FALSE at the moment :
do {
if (condition)
break;
/* and here we have condition changed to TRUE */
/* process is NOT in any wait queue yet */
/* then unroll __wait_event(wq, condition); */
do { DEFINE_WAIT(__wait); for (;;) {
prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE);
/* at this point condition is TRUE , process is in a wait queue
and its state is
TASK_UNINTERRUPTIBLE. If rescheduling happens now the
process will asleep,
despite of condition is TRUE . And will not be woken up until
next wake_up happens
Is that correct ? */
if (condition) break;
schedule();
}
finish_wait(&wq, &__wait);
} while (0)
/* end of unroll __wait_event*/
} while (0)
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next prev parent reply other threads:[~2005-12-23 1:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5mIFB-6PS-33@gated-at.bofh.it>
2005-12-23 0:16 ` Robert Hancock
2005-12-23 0:51 ` Alexey Shinkin
2005-12-23 1:10 ` Steven Rostedt
2005-12-23 1:46 ` Alexey Shinkin [this message]
2005-12-23 20:48 ` Steven Rostedt
2005-12-23 0:04 Alexey Shinkin
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