Hello,
** Nicholas Marriott [2011-08-27 00:26:52 +0100]:
> If you use libevent 2.x, you STILL need to set EVENT_NOEPOLL=1.
> The hanging bug is an epoll bug in the Linux kernel, so you have to make
> libevent use poll or select instead.
> The reason you can't just do this with libevent 1.4 is because there is
> a bug in the poll and select backends which is worse (makes the server
> hang not just client); this is fixed in libevent 2.x.
Sorry, my fault. I was try to say that on my box (Archlinux x86_64)
with given kernel, having libevent2 _and_ setting EVENT_NOEPOLL=1 don't help
to avoid hanging.
> On Sat, Aug 27, 2011 at 01:18:55AM +0900, Vladimir Lomov wrote:
>> Hello,
>> I want to add my 2 cents to the topic...
>> ** Nicholas Marriott 2011-06-28 07:07
>> on topic "tmux has-session -t MYSESSION 2> /dev/null" said
>>> This is a bug in epoll on Linux, you have several choices:
>>> - Build tmux against libevent 2 and set EVENT_NOEPOLL=1 in the
>>> environment before starting it. (libevent 1.4 has a another bug which
>>> is worse, so only do this if you use libevent 2.)
>>> - Avoid redirecting to /dev/null. IIRC you can workaround it with
>>> for example tmux info|cat >/dev/null.
Actually this advice don't help me too. If I run in terminal
<code>
$ tmux -2 -u -L docs has-session -t tooll | cat > /dev/null
session not found: tooll
</code>
as well as
<code>
$ tmux -2 -u -L docs has-session -t tooll | cat > /dev/null 2>&1
session not found: tooll
</code>
The list of existing sessions
<code>
$ tmux -2 -u -L docs ls
editors: 4 windows (created...) [...]
tools: 3 windows (created...) [...]
vcs: 2 windows (created...) [...]
</code>
I'm using bash shell
<code>
$ [C-x C-v]
GNU bash, version 4.2.10(2)-release (x86_64-unknown-linux-gnu)
</code>
The worse I can't rely on that code, because exit status from pipe is
exit status of last executed command (man bash).
>> I report following:
>> 1) system: Archlinux x86_64,
>> gcc: 4.6.1,
>> kernel (uname -s -r -v):
>> Linux 2.6.39.1-zen-ARCH-00324-g6d6d304 #1 ZEN SMP PREEMPT Wed Jun 15
>> 14:45:20 IRKST 2011
>> tmux: compiled from svn (revno. 2588)
>> libevent: 2.0.12 and 2.0.13 (tried on two hosts)
>> 2) several sessions: 'tools', 'editors', 'vcs' on socket 'docs': tmux -2 -u
>> -L docs
>> 3) in terminal
>> $ tmux -2 -u -L docs has-session -t tools
>> $
>> $ tmux -2 -u -L docs has-session -t tool
>> $
>> $ tmux -2 -u -L docs has-session -t tooll
>> session not found: tooll
>> $ tmux -2 -u -L docs has-session -t tools 2> /dev/null
>> $
>> $ tmux -2 -u -L docs has-session -t tooll 2> /dev/null
>> ... hanging, have to kill terminal and start new one
>> $ export EVENT_NOEPOLL=1
>> $ tmux -2 -u -L docs has-session -t tools
>> $
>> $ tmux -2 -u -L docs has-session -t tooll
>> session not found: tooll
>> $ tmux -2 -u -L docs has-session -t tools 2> /dev/null
>> $ tmux -2 -u -L docs has-session -t tooll 2> /dev/null
>> ... hanging
>> So, if I'm right, only second solution is working and libevent2
>> [completely] broken in that respect.
To summarize: I just want to say that on my box advice with
EVENT_NOEPOLL don't work.
And thank you for this incredible software!
---
WBR, Vladimir Lomov
--
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