Re: embedded python and threading

Path	csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!rt.uk.eu.org!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path	<python-python-list@m.gmane.org>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.000
X-Spam-Evidence	'H': 1.00; 'S': 0.00; 'interpreter': 0.05; 'attribute': 0.07; 'initialize': 0.07; 'suddenly': 0.07; 'tries': 0.07; 'emulate': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'run,': 0.09; 'python': 0.11; 'thread': 0.14; '"in': 0.16; '55,': 0.16; '70,': 0.16; 'concurrency': 0.16; 'concurrency,': 0.16; 'doc:': 0.16; 'from:addr:behnel.de': 0.16; 'from:addr:stefan_ml': 0.16; 'from:name:stefan behnel': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'stuff,': 0.16; 'thread,': 0.16; 'subject:python': 0.16; 'app': 0.19; 'module': 0.19; 'stefan': 0.19; 'not,': 0.20; 'code,': 0.22; 'example': 0.22; 'import': 0.22; 'print': 0.22; 'header:User- Agent:1': 0.23; 'error': 0.23; 'script': 0.25; 'switch': 0.26; 'gets': 0.27; 'header:X-Complaints-To:1': 0.27; 'header:In-Reply- To:1': 0.27; 'code': 0.31; '"",': 0.31; 'continues': 0.31; 'releasing': 0.31; 'file': 0.32; 'figure': 0.32; 'stuff': 0.32; 'run': 0.32; 'another': 0.32; '(most': 0.33; 'guess': 0.33; 'maybe': 0.34; 'received:84': 0.35; 'test': 0.35; 'but': 0.35; "didn't": 0.36; 'so,': 0.37; 'to:addr:python-list': 0.38; 'recent': 0.39; 'does': 0.39; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'according': 0.40; 'release': 0.40; 'ensure': 0.60; 'logs': 0.60; 'then,': 0.60; 'new': 0.61; 'further': 0.61; 'first': 0.61; 'back': 0.62; 'show': 0.63; 'provide': 0.64; 'huh?': 0.84; 'received:arcor-ip.net': 0.84; 'received:pools.arcor-ip.net': 0.84; 'execution,': 0.91
X-Injected-Via-Gmane	http://gmane.org/
To	python-list@python.org
From	Stefan Behnel <stefan_ml@behnel.de>
Subject	Re: embedded python and threading
Date	Fri, 26 Jul 2013 11:29:49 +0200
References	<a6710206-8676-48c8-ad66-95139e695503@googlegroups.com>
Mime-Version	1.0
Content-Type	text/plain; charset=UTF-8
Content-Transfer-Encoding	7bit
X-Gmane-NNTP-Posting-Host	dslb-084-056-045-139.pools.arcor-ip.net
User-Agent	Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130623 Thunderbird/17.0.7
In-Reply-To	<a6710206-8676-48c8-ad66-95139e695503@googlegroups.com>
X-BeenThere	python-list@python.org
X-Mailman-Version	2.1.15
Precedence	list
List-Id	General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe	<http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive	<http://mail.python.org/pipermail/python-list/>
List-Post	<mailto:python-list@python.org>
List-Help	<mailto:python-list-request@python.org?subject=help>
List-Subscribe	<http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups	comp.lang.python
Message-ID	<mailman.5138.1374831002.3114.python-list@python.org> (permalink)
Lines	39
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1374831002 news.xs4all.nl 15904 [2001:888:2000:d::a6]:57745
X-Complaints-To	abuse@xs4all.nl
Xref	csiph.com comp.lang.python:51291

Show key headers only | View raw

David M. Cotter, 26.07.2013 08:15:
> in my app i initialize python on the main thread, then immediately call PyEval_SaveThread() because i do no further python stuff on the main thread.
> 
> then, for each script i want to run, i use boost::threads to create a new thread, then on that thread i "ensure" the GIL, do my stuff, then release it.
> 
> so, to test concurrency, on my first background thread, i do an infinite loop that just logs "i'm alive", then calls sleep(0.25)
> 
> so that thread continues to run forever (with it's GIL ensured)
> 
> according to the doc: "In order to emulate concurrency of execution, the interpreter regularly tries to switch threads"
> 
> so i figure i can run another thread that does a single print statement:
> 
>> ensure gil
>> print my thing
>> release gil
> 
> and this DOES run.  however, after releasing it's gil, i guess the interpeter gets back to the first back thread, but then has this error immediately:
> 
>     9: Traceback (most recent call last):
>     9:   File "<string>", line 70, in ?
>     9:   File "<string>", line 55, in main
>     9: AttributeError: 'builtin_function_or_method' object has no attribute 'sleep'
> 
> suddenly the sleep module has been unloaded?? huh?  i thought the thread state had been preserved?

You didn't show your code, but as a wild guess, maybe you did

    from time import time

instead of

    import time

somewhere? If not, please provide the exact example code that you are running.

Stefan

Thread

embedded python and threading "David M. Cotter" <me@davecotter.com> - 2013-07-25 23:15 -0700
  Re: embedded python and threading Stefan Behnel <stefan_ml@behnel.de> - 2013-07-26 11:29 +0200
    Re: embedded python and threading "David M. Cotter" <me@davecotter.com> - 2013-07-26 08:57 -0700
      Re: embedded python and threading David Robinow <drobinow@gmail.com> - 2013-07-26 12:14 -0400
      Re: embedded python and threading John Gordon <gordon@panix.com> - 2013-07-26 16:34 +0000
        Re: embedded python and threading "David M. Cotter" <me@davecotter.com> - 2013-07-26 10:25 -0700
          Re: embedded python and threading "David M. Cotter" <me@davecotter.com> - 2013-07-26 10:28 -0700
            Re: embedded python and threading Stefan Behnel <stefan_ml@behnel.de> - 2013-07-26 20:38 +0200

csiph-web