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Date: Wed, 8 May 2013 19:43:21 -0400
From: Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: printf + pthreads+gdb+mintty = hang?
Message-ID: <20130508234321.GB4232@ednor.casa.cgf.cx>
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References: <5189627F DOT 3050801 AT cs DOT utoronto DOT ca> <20130508183617 DOT GA8072 AT ednor DOT casa DOT cgf DOT cx> <518AB9F2 DOT 6050501 AT cs DOT utoronto DOT ca>
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User-Agent: Mutt/1.5.20 (2009-06-14)

On Wed, May 08, 2013 at 04:47:46PM -0400, Ryan Johnson wrote:
>On 08/05/2013 2:36 PM, Christopher Faylor wrote:
>> On Tue, May 07, 2013 at 04:22:23PM -0400, Ryan Johnson wrote:
>>> Hi all,
>>>
>>> Running the attached STC inside gdb hangs (zero CPU util, have to kill
>>> gdb from Task Manager, killing a.exe doesn't cut it).
>>>
>>> Compile line used: g++ -Wall -g -mthreads -DBUG bug.cpp
>>>
>>> I currently have the following package versions:
>>> cygwin-1.7.18(0.263/5/3) 2013-04-19
>>> mintty-1.1.3-1
>>> gdb-7.6.50-1
>>> gcc-4.5.3-3
>>>
>>> The problem seems to be related to threads calling fprintf inside gdb,
>>> it runs fine from the command line, or with printf instead; both fprintf
>>> and printf sometimes trigger "warning: SuspendThread failed. (winerr 6)"
>>> (not sure if that matters).
>>>
>>> Known issue? Easy workaround? New bug?
>> Known, long-standing issue.  I put a workaround in the latest snapshot.
>Hmm. The STC still hangs about 25% of the time (down from ~100%), so 
>things are improved but not fixed.

Ok.  Then I'll go with "long standing issue" then.  I've mentioned the
problem with outputting lots os stuff to a pty here many times.

cgf

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