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From: =?UTF-8?B?xLBzbWFpbCBEw7ZubWV6?= <ismail AT donmez DOT ws>
Date: Mon, 8 Jun 2015 18:25:59 +0300
Message-ID: <CAJ1KOAh5Sqy2Zhag=zddULcZFTa759uyr4uXY_7QGhv85w_2Og@mail.gmail.com>
Subject: Re: More details about the tmux 2.0 regression
To: cygwin AT cygwin DOT com
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On Mon, Jun 8, 2015 at 6:12 PM, İsmail Dönmez <ismail AT donmez DOT ws> wrote:
> On Mon, Jun 8, 2015 at 4:21 PM, Corinna Vinschen
> <corinna-cygwin AT cygwin DOT com> wrote:
>> On Jun  8 14:41, Corinna Vinschen wrote:
>>> On Jun  6 12:58, İsmail Dönmez wrote:
>>> > Hi,
>>> >
>>> > I had a nice discussion with tmux maintainers over at
>>> > https://github.com/tmux/tmux/issues/13 about the tmux 2.0 regression
>>> > on Cygwin.
>>> >
>>> > Long story short, tmux is trying to read /proc/<pid>/cmdline and
>>> > /proc/<pid>/cwd for various reasons and for non-Cygwin programs this
>>> > is quite slow. You can reproduce this easily run cmd.exe inside bash
>>> > and try to
>>> >
>>> > cat /proc/<pid of cmd.exe>/cmdline
>>>
>>> Good catch!
>>>
>>> The problem here was that this functionality is very Cygwin centric.  It
>>> tries to call into the process itself to fetch the information.
>>>
>>> E.g, assuming you have some /proc/1234, it tries to fetch the information
>>> by sending a request to process 1234 and then waits for that process
>>> setting a semaphore.  A non-Cygwin process will obviously fail to do so,
>>> not knowing about the method at all.
>>>
>>> I fixed that in the Cygwin git repo and it seems to work much better now
>>> to run native tools inside tmux with this change.
>>>
>>> I'll upload a developer snapshot on https://cygwin.com/snapshots/ later
>>> today.
>>
>> Snapshot is up.
>
> That resolves the problem for me, cheers!

One question though, would it be possible to return executable name
instead of <defunct> for non-Cygwin processes?

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