From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Andrey Nechypurenko <andreynech@googlemail.com>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai] Qeustion about rtdm_event_timedwait
Date: Mon, 01 Oct 2012 18:20:21 +0200 [thread overview]
Message-ID: <5069C2C5.5080306@xenomai.org> (raw)
In-Reply-To: <CAOiXNkCF950997tST8T4VJQHxTT=2eh+GwcwRPsgfmZu3oq=Rw@mail.gmail.com>
On 10/01/2012 06:13 PM, Andrey Nechypurenko wrote:
>>> Also note that rtdm_event_wait works like a semaphore, not like a
>>> condition variable: it has a counter, rtdm_event_wait will return
>>> immediately as many times as rtdm_event_signal was called.
>
> In this case event_pulse will be then the closest match to condition
> variable. Right?
Well, looking at the code, it is not right, rtdm_event_wait works like a
semaphore, but a binary semaphore. So, if rtdm_event_signal was called
before rtdm_event_wait, rtdm_event_wait will return immediately, but if
it was called several times, rtdm_event_wait will return immediately
only once.
rtdm_event_pulse unlocks all threads currently blocked in
rtdm_event_wait, but you are right, it works more like a condvar.
--
Gilles.
prev parent reply other threads:[~2012-10-01 16:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-01 15:51 [Xenomai] Qeustion about rtdm_event_timedwait Andrey Nechypurenko
2012-10-01 15:57 ` Gilles Chanteperdrix
2012-10-01 16:01 ` Andrey Nechypurenko
2012-10-01 16:05 ` Gilles Chanteperdrix
2012-10-01 16:10 ` Andrey Nechypurenko
2012-10-01 16:13 ` Andrey Nechypurenko
2012-10-01 16:20 ` Gilles Chanteperdrix [this message]
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