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Subject:	Re: gdb pty problem [Was: emacs gud-interface is not updated after gdb command execution (maybe because of incomplete output from gdb)]
To:	cygwin AT cygwin DOT com
References:	<466943424 DOT 37628 DOT 394d161a-7219-415d-a659-0f774811ad2d DOT open-xchange AT email DOT 1und1 DOT de> <44459aa0-4381-2368-ab63-5dffc26f3344 AT cornell DOT edu> <e29d08b0-aaed-46ea-a4eb-960b1e462692 AT cornell DOT edu> <a50d8bef-cc9b-3b35-8812-b26360591662 AT cornell DOT edu> <20160531094115 DOT GE24015 AT calimero DOT vinschen DOT de> <34c9cf10-4930-a017-92fc-fd56171671b1 AT cornell DOT edu> <9403d1d8-21d1-bf7e-dddc-d77b42e4795d AT cornell DOT edu> <20160601142804 DOT GG11431 AT calimero DOT vinschen DOT de> <aad3bfc2-c6a5-3299-2e66-90892286753b AT cornell DOT edu> <91397a76-1265-1cda-45e2-573e63b48fa3 AT cornell DOT edu> <20160601182855 DOT GA18871 AT calimero DOT vinschen DOT de>
Cc:	Peter Castro <doctor AT fruitbat DOT org>
From:	Ken Brown <kbrown AT cornell DOT edu>
Message-ID:	<ed68c616-120c-6149-9882-8849a8ccd4e4@cornell.edu>
Date:	Wed, 1 Jun 2016 15:05:00 -0400
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On 6/1/2016 2:28 PM, Corinna Vinschen wrote:
> On Jun  1 11:22, Ken Brown wrote:
>> On 6/1/2016 10:33 AM, Ken Brown wrote:
>>> On 6/1/2016 10:28 AM, Corinna Vinschen wrote:
>>>> Hi Ken,
>>>>
>>>> On Jun  1 09:02, Ken Brown wrote:
>>>>> On 6/1/2016 8:51 AM, Ken Brown wrote:
>>>>>> On 5/31/2016 5:41 AM, Corinna Vinschen wrote:
>>>>>>> Any chance you could bisect Cygwin to help finding the culprit?
>>>>>>
>>>>>> The culprit is
>>>>>>
>>>>>> commit 252a07b0ad3353abcd0fcd9b1b65ff977acd679e
>>>>>> Author: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
>>>>>> Date:   Fri Apr 3 13:07:35 2015 +0900
>>>>>>
>>>>>>    Cygwin hangs up if several keys are typed during outputting a lot of
>>>>>> texts.
>>>>>>
>>>>>>        * fhandler_tty.cc (fhandler_pty_slave::read): Change
>>>>>> calculation of
>>>>>>        "readlen" not to use "bytes_in_pipe" value directly.
>>>>>>
>>>>>>
>>>>>> Reverting that commit fixes the problem.
>>>>>
>>>>> Unfortunately, all kinds of other things break.  For example, emacs
>>>>> exits
>>>>> immediately, ls produces no output,....
>>>>
>>>> Are you sure?  I just tried it myself and ls as well as emacs work
>>>> fine for me.
>>>
>>> It works for me now too.  I must have done something wrong the first
>>> time I tried.
>>
>> And this also fixes the original problem in emacs that started the thread:
>>
>>   https://www.cygwin.com/ml/cygwin/2016-05/msg00318.html
>
> I reverted commit 252a07b0ad3353abcd0fcd9b1b65ff977acd679e in git master
> for now, unless we find a reason to rework this again.

Thanks.  By the way, I'd like to take the opportunity to thank Peter 
Castro for the Cygwin Time Machine 
(http://www.fruitbat.org/Cygwin/#cygwintimemachine).  The bisection I 
did, spanning a period of about 4 years, would have been virtually 
impossible without it.

Ken


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