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Date: Sat, 20 Jun 2015 16:51:33 -0400
Message-ID: <CAH5rLZU6mbwex-EM81N0TFpauoZ23ZJsAU0D6M1H3APzZmdO9w@mail.gmail.com>
Subject: Re: gdb arbitrarily starting threads
From: "William M. (Mike) Miller" <william.m.miller@gmail.com>
To: cygwin@cygwin.com
Content-Type: text/plain; charset=UTF-8

On Sat, Jun 20, 2015 at 4:42 PM, Ken Brown <kbrown@cornell.edu> wrote:
> On 6/20/2015 4:02 PM, William M. (Mike) Miller wrote:
>>
>> Thanks for the reply.  My concern, however, isn't that new threads are
>> being created; it's that when gdb does this, it sets the state of all
>> threads, including my main thread, to "(running)" so that I can't
>> single-step through my program any more.  If I try to say "next", I
>> get the error:
>>
>>      Cannot execute this command while the selected thread is running.
>>
>> But I did nothing overt to start my thread.
>>
>> It never used to do this, but it happens regularly now.
>
>
> I'm not seeing this on my system (Windows 7, both 32-bit and 64-bit Cygwin).

I'm running 8.1, so that could well be the difference there.

> I debugged the emacs source, set a breakpoint, and stepped through the
> program when the breakpoint was hit.
>
> Could this be caused by BLODA interference
> (https://cygwin.com/faq/faq.html#faq.using.bloda)?

I certainly won't say that it's impossible, but I think it's unlikely.
The symptoms mentioned there don't seem related.  Also, the only one
of those programs I'm using is Windows Defender, and I've been using
it for over two years, but this problem only started within the last
few months.  (Of course, I suppose it's possible that something in
Cygwin/gdb/gcc changed to make it more sensitive, or an update to
Windows Defender made it more intrusive...)

Failing a way to keep gdb from doing this, is there a way in gdb to
stop a thread that's in "(running)" state?  (Even though it's sitting
at a breakpoint.)

-- 
William M. (Mike) Miller | Edison Design Group
william.m.miller@gmail.com

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