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Message-ID: <3DFDC146.5040101@st.com>
Date: Mon, 16 Dec 2002 13:04:22 +0100
From: Pavel Holejsovsky <pavel DOT holejsovsky AT st DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: More pipe (and other) improvements in snapshot
References: <20021211041250 DOT GA31215 AT redhat DOT com> <094401c2a1da$954ab980$1d6cba8c AT sfdev3> <20021212165736 DOT GA14986 AT redhat DOT com> <H000076f17389de6 DOT 1039774000 DOT eux100 DOT sgp DOT st DOT com AT MHS> <3DF9F33C DOT 6060906 AT st DOT com> <20021214052744 DOT GA17108 AT redhat DOT com> <20021214053743 DOT GA20682 AT redhat DOT com> <H000076f173b29e7 DOT 1040038646 DOT eux100 DOT sgp DOT st DOT com AT MHS>
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20021214 snapshot seems to work ok, my testcase below does not fail any 
more. Thanks!

Pavel

cgf AT redhat DOT com wrote:
> On Sat, Dec 14, 2002 at 12:37:43AM -0500, Christopher Faylor wrote:
> 
>>On Sat, Dec 14, 2002 at 12:27:44AM -0500, Christopher Faylor wrote:
>>
>>>On Fri, Dec 13, 2002 at 03:48:28PM +0100, Pavel Holejsovsky wrote:
>>>
>>>>nhv AT cape DOT com wrote:
>>>>
>>>>>Christopher Faylor wrote:
>>>>>
>>>>>>On Thu, Dec 12, 2002 at 07:32:16AM -0500, Norman Vine wrote:
>>>>>>
>>>>>>>Any 'tips' as to how to best debug this appreciated 
>>>>>>
>>>>>>- Attach to the hung process with gdb and see where it is hung.
>>>>>>
>>>>>>- Provide cygcheck output.
>>>>>>
>>>>>>- Run under strace and see if you can infer where hangs or problems
>>>>>>are occurring.
>>>>
>>>>The hung process (sed) is actually not hung, but connected to stdin 
>>>>instead of file. The root cause is that when config.status is processed 
>>>>by bash, then sometimes `` construct forgets all output, causing 
>>>>different generated file names to be empty, thus connecting sed to stdin 
>>>>instead of some file. Following command line reproduces the bug for me:
>>>>
>>>>while true; do test "`echo foo`" = "foo" || echo failed; done
>>>>
>>>>When this command is run inside bash, then "failed" lines appear quite 
>>>>regularly. The bug is reproducible only with /bin/bash, /bin/sh works 
>>>>reliably.
>>>
>>>I meant to test the above before I made some more changes to cygwin
>>>to attempt to avoid data loss but I didn't get around to it.
>>>
>>>So, there is a snapshot up there which may or may not solve the problem.
>>>The above command doesn't die for me now, so I guess that's something.
>>>
>>>I'll check the prevous snapshot tomorrow to see if it actually fails for
>>>me.  I've been a little sick for a couple of weeks now and attempting to
>>>stay with my "work on real job in the day and cygwin at night" scenario
>>>is not working too well.
>>>
>>>In the meantime, please try the current snapshot.  It is probably
>>>slightly (but possibly unoticeably) slower but it should be very much
>>>less likely to lose data in a pipe.
>>>
>>>The latest snapshot also has some new inline assembly functions courtesy
>>>of some cygwin-developers (Gary R.  Van Sickle and Thomas Pfaff) which
>>>might cause a little bit of a boost, too.
>>
>>Nevermind.  I just tried the current snapshot on my NT4 machien and it
>>puked all over the place.
>>
>>I'll fix it tomorrow.  Please avoid this snapshot until then.
> 
> 
> This should be fixed now.  Please try the latest snapshot.
> 
> Corinna also tracked down some thinkos in my handling of text mode
> reads which are fixed in this snapshot.  Thanks, Corinna.
> 
> cgf
> 
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