From: ori@eigenstate.org
To: 9fans@9fans.net
Subject: Re: [9fans] odd rwakeup qunlock behaviour in 9vx
Date: Wed, 08 Nov 2023 16:08:31 -0500 [thread overview]
Message-ID: <05DC7BC5698D779E601D2AB8E1882F4B@eigenstate.org> (raw)
In-Reply-To: <16991481040.88FDBb.122754@composer.9fans.topicbox.com>
A complete snippet to reproduce this may be useful. That
said, I have code that uses qlock and rendez heavily with
no sleeps, and have not had any issues on 9front.
Quoth ibrahim via 9fans <9fans@9fans.net>:
> I have a function chan_send in which :
> chan_send (...) {
> qlock()
> rwakeup(...)
> qunlock()
> }
>
> If two such chan_send functions are called without a "task-switch" 9vx crashes. A work around for this problem is to place a sleep(0) after qunlock to enforce a task-switch
>
> chan_send(...) {
> qlock()
> rwakeup(...)
> qunlock()
> sleep(0)
> }
>
> This behaviour isn't documented anywhere. I'll test it next on bare metal with a real kernel to find out if this is only a 9vx problem.
>
------------------------------------------
9fans: 9fans
Permalink: https://9fans.topicbox.com/groups/9fans/T7a5bb3cde50a8a9a-M861c10f8be4b323658622f9a
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next prev parent reply other threads:[~2023-11-08 21:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-05 1:35 ibrahim via 9fans
2023-11-08 21:08 ` ori [this message]
2023-11-08 23:42 ` ibrahim via 9fans
2023-11-09 3:16 ` Lucio De Re
2023-11-10 2:24 ` ibrahim via 9fans
2023-11-10 6:40 ` Lucio De Re
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