[Scons-users] Cleaning up a background process

[William Blevins]

Thanks for letting us know the solution. We can pass it on to others in
similar situations.

On Mar 21, 2017 2:09 PM, "Brian Cody" <brian.j.cody at gmail.com> wrote:

> Bill,
>
> While I was working towards a small example, I found my solution. It
> wasn't actually an SCons issue at all. For those who might be wondering,
> the functions registered with atexit() don't run when the main thread has
> completed, as I had assumed. It runs when EVERY thread has completed. I was
> intending to use atexit to clean up a thread, but it seems that the
> requirement is the opposite. While looking into the multiprocessing module,
> I discovered the fix which could be applied to threads as well. There is an
> attribute called "daemon", which will automatically shutdown the thread if
> only daemon threads/processes remain. After discovering this, I was able to
> use a registered atexit hook to clean up the external process.
>
> Thanks
>
>
> On Tue, Mar 21, 2017 at 11:37 AM, Bill Deegan <bill at baddogconsulting.com>
> wrote:
>
>> Also, do you have a small example?
>>
>> On Tue, Mar 21, 2017 at 11:11 AM, Bill Deegan <bill at baddogconsulting.com>
>> wrote:
>>
>>> It should work. It's been the proscribed method for some time, and other
>>> users have discussed using it as recently as early march.
>>>
>>> Which version of SCons/Python and what platform?
>>>
>>> -Bill
>>>
>>> On Tue, Mar 21, 2017 at 10:29 AM, Brian Cody <brian.j.cody at gmail.com>
>>> wrote:
>>>
>>>> Hey everyone,
>>>>
>>>> I have an issue that I pushed aside several months ago that I now need
>>>> to revisit.
>>>>
>>>> A few build steps require a background process to be running. If
>>>> anything goes wrong during the build, that background process needs to be
>>>> killed. Also if nothing goes wrong during the build, the process must be
>>>> killed on completion. It's launched with an action now. There seems to be
>>>> no consistent way to be able to tell when all targets that would use the
>>>> process are completed. Instead, I was thinking to register with atexit on
>>>> spawning the process to hook in the cleanup function.
>>>>
>>>> I get that it isn't directly supported but I'm not sure why it isn't
>>>> working. The atexit._exithandlers list looks good before sys.exit is called
>>>> in Script/Main.py, but the handlers just aren't called.
>>>>
>>>> Is there a known fix for atexit when combined with SCons? Is there any
>>>> other sort of hook that I may be missing? Or a completely new suggestion?
>>>>
>>>> Thank you
>>>>
>>>> -Brian
>>>>
>>>>
>>>>
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>>>>
>>>>
>>>
>>
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>
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