From: Laszlo Ersek <lersek@redhat.com>
To: Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] semaphore: fix a hangup problem under loadon NetBSD hosts.
Date: Tue, 02 Jul 2013 17:47:27 +0200 [thread overview]
Message-ID: <51D2F60F.1020103@redhat.com> (raw)
In-Reply-To: <130703002742.M0121797@mirage.ceres.dti.ne.jp>
On 07/02/13 17:27, Izumi Tsutsui wrote:
> Laszlo Ersek wrote:
>> Conversely, the only time we need to send a signal is the 0->1 count
>> transition (*).
>
> Per comments from Soda, signals could be required even on count >0,
> if more than one threads are sleeping in qemu_cond_timedwait(),
> and more than one qemu_sem_post() are called at once, then
> the second qemu_sem_post() gets the mutex before sleeping threads
> in qemu_sem_timedwait().
You're right.
Laszlo
prev parent reply other threads:[~2013-07-02 15:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-29 10:22 [Qemu-devel] [PATCH] semaphore: fix a hangup problem under load on NetBSD hosts Izumi Tsutsui
2013-07-01 9:54 ` Laszlo Ersek
2013-07-02 15:27 ` [Qemu-devel] [PATCH] semaphore: fix a hangup problem under loadon " Izumi Tsutsui
2013-07-02 15:47 ` Laszlo Ersek [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=51D2F60F.1020103@redhat.com \
--to=lersek@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=tsutsui@ceres.dti.ne.jp \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.