From waltman at pobox.com  Sun Dec  4 19:40:27 2011
From: waltman at pobox.com (Walt Mankowski)
Date: Sun, 4 Dec 2011 22:40:27 -0500
Subject: [Philadelphia-pm] Topic for Monday's meeting
In-Reply-To: <4ED6E44A.2030601@criticode.com>
References: <20111130205456.GB20135@mawode.com>
	<4ED6E44A.2030601@criticode.com>
Message-ID: <20111205034027.GU3338@mawode.com>

Thanks! I think it was the 2009 YAPC, but whatever.  This will be
basically the same talk, but I have a longer code sample to walk
through if we have time.

On Wed, Nov 30, 2011 at 09:19:54PM -0500, Darian Anthony Patrick wrote:
> That sounds good. I think I saw it at YAPC10. It was good. I would
> enjoy seeing it again.
> 
> On 11/30/2011 03:54 PM, Walt Mankowski wrote:
> > So, we're scheduled to have our December meeting this coming
> > Monday, December 5. I'd like to volunteer to give a talk on using
> > threads on Perl. I did this talk at YAPC a few years ago, but I
> > don't think I've given it for phl.pm yet.
> > 
> > Sound good?
> > 
> > Walt
> > 
> > 
> > 
> > _______________________________________________ Philadelphia-pm
> > mailing list Philadelphia-pm at pm.org 
> > http://mail.pm.org/mailman/listinfo/philadelphia-pm
> 
> -- 
> Darian Anthony Patrick, Criticode LLC
> Office:     (215) 789-9956
> Facsimile:  (866) 789-2992
> Email/XMPP: darian at criticode.com
> Web:        http://criticode.com
> =================================================
> BCF1 E7AD 15AD 8A99 F613 AF5F 2A9C C45C F580 E087
> =================================================
> * Signed and encrypted communications preferred.
> _______________________________________________
> Philadelphia-pm mailing list
> Philadelphia-pm at pm.org
> http://mail.pm.org/mailman/listinfo/philadelphia-pm
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From waltman at pobox.com  Sun Dec  4 19:47:01 2011
From: waltman at pobox.com (Walt Mankowski)
Date: Sun, 4 Dec 2011 22:47:01 -0500
Subject: [Philadelphia-pm] Reminder: tech meeting Monday night, December 5
In-Reply-To: <20111003050719.GB24966@mawode.com>
References: <20111003050719.GB24966@mawode.com>
Message-ID: <20111205034701.GV3338@mawode.com>

Just wanted to send out a reminder about our December tech meeting.
It will be tomorrow night, Monday December 5, at 7 PM, at our usual
spot at 307 Levine Hall at Penn.

I'll be giving a talk on "Getting Started With Multithreaded Perl".
It's basically the same talk I gave at YAPC in 2009, but I'm guessing
most people haven't heard it. I did recently actually have an excuse
to use threads in some research code I'm working on.  I munged that
into some sample code that I can demo assuming my voice holds out that
long. (I've on the tail end of a nasty chest cold.)

Walt
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From websco137 at gmail.com  Mon Dec  5 14:10:33 2011
From: websco137 at gmail.com (Daniel Webster)
Date: Mon, 5 Dec 2011 17:10:33 -0500
Subject: [Philadelphia-pm] Topic for Monday's meeting
In-Reply-To: <20111205034027.GU3338@mawode.com>
References: <20111130205456.GB20135@mawode.com>
	<4ED6E44A.2030601@criticode.com> <20111205034027.GU3338@mawode.com>
Message-ID: <CADkZXEUzyFw-bhSov9Nkb9Yrsq6u4BJRcsoPQhFWFOOBfkd7gQ@mail.gmail.com>

What time? Where?
Sorry if I missed that detail in prior emails


On Sun, Dec 4, 2011 at 10:40 PM, Walt Mankowski <waltman at pobox.com> wrote:

> Thanks! I think it was the 2009 YAPC, but whatever.  This will be
> basically the same talk, but I have a longer code sample to walk
> through if we have time.
>
> On Wed, Nov 30, 2011 at 09:19:54PM -0500, Darian Anthony Patrick wrote:
> > That sounds good. I think I saw it at YAPC10. It was good. I would
> > enjoy seeing it again.
> >
> > On 11/30/2011 03:54 PM, Walt Mankowski wrote:
> > > So, we're scheduled to have our December meeting this coming
> > > Monday, December 5. I'd like to volunteer to give a talk on using
> > > threads on Perl. I did this talk at YAPC a few years ago, but I
> > > don't think I've given it for phl.pm yet.
> > >
> > > Sound good?
> > >
> > > Walt
> > >
> > >
> > >
> > > _______________________________________________ Philadelphia-pm
> > > mailing list Philadelphia-pm at pm.org
> > > http://mail.pm.org/mailman/listinfo/philadelphia-pm
> >
> > --
> > Darian Anthony Patrick, Criticode LLC
> > Office:     (215) 789-9956
> > Facsimile:  (866) 789-2992
> > Email/XMPP: darian at criticode.com
> > Web:        http://criticode.com
> > =================================================
> > BCF1 E7AD 15AD 8A99 F613 AF5F 2A9C C45C F580 E087
> > =================================================
> > * Signed and encrypted communications preferred.
> > _______________________________________________
> > Philadelphia-pm mailing list
> > Philadelphia-pm at pm.org
> > http://mail.pm.org/mailman/listinfo/philadelphia-pm
>
> _______________________________________________
> Philadelphia-pm mailing list
> Philadelphia-pm at pm.org
> http://mail.pm.org/mailman/listinfo/philadelphia-pm
>
>


-- 
- Dan Webster
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From websco137 at gmail.com  Mon Dec  5 14:12:13 2011
From: websco137 at gmail.com (Daniel Webster)
Date: Mon, 5 Dec 2011 17:12:13 -0500
Subject: [Philadelphia-pm] Topic for Monday's meeting
In-Reply-To: <CADkZXEUzyFw-bhSov9Nkb9Yrsq6u4BJRcsoPQhFWFOOBfkd7gQ@mail.gmail.com>
References: <20111130205456.GB20135@mawode.com>
	<4ED6E44A.2030601@criticode.com> <20111205034027.GU3338@mawode.com>
	<CADkZXEUzyFw-bhSov9Nkb9Yrsq6u4BJRcsoPQhFWFOOBfkd7gQ@mail.gmail.com>
Message-ID: <CADkZXEVy4uTndOeP3Oa22a-ao-21Ca0A3GC1kD84eau3awQdRg@mail.gmail.com>

Never mind folks...
Got it off the website.

Mon 5 Dec 2011 - Walt Mankowski will be giving a tech talk, "Getting
Started With Multithreaded Perl" at Levine Hall, 3330 Walnut St., Room 307,
7-9 PM


On Mon, Dec 5, 2011 at 5:10 PM, Daniel Webster <websco137 at gmail.com> wrote:

> What time? Where?
> Sorry if I missed that detail in prior emails
>
>
> On Sun, Dec 4, 2011 at 10:40 PM, Walt Mankowski <waltman at pobox.com> wrote:
>
>> Thanks! I think it was the 2009 YAPC, but whatever.  This will be
>> basically the same talk, but I have a longer code sample to walk
>> through if we have time.
>>
>> On Wed, Nov 30, 2011 at 09:19:54PM -0500, Darian Anthony Patrick wrote:
>> > That sounds good. I think I saw it at YAPC10. It was good. I would
>> > enjoy seeing it again.
>> >
>> > On 11/30/2011 03:54 PM, Walt Mankowski wrote:
>> > > So, we're scheduled to have our December meeting this coming
>> > > Monday, December 5. I'd like to volunteer to give a talk on using
>> > > threads on Perl. I did this talk at YAPC a few years ago, but I
>> > > don't think I've given it for phl.pm yet.
>> > >
>> > > Sound good?
>> > >
>> > > Walt
>> > >
>> > >
>> > >
>> > > _______________________________________________ Philadelphia-pm
>> > > mailing list Philadelphia-pm at pm.org
>> > > http://mail.pm.org/mailman/listinfo/philadelphia-pm
>> >
>> > --
>> > Darian Anthony Patrick, Criticode LLC
>> > Office:     (215) 789-9956
>> > Facsimile:  (866) 789-2992
>> > Email/XMPP: darian at criticode.com
>> > Web:        http://criticode.com
>> > =================================================
>> > BCF1 E7AD 15AD 8A99 F613 AF5F 2A9C C45C F580 E087
>> > =================================================
>> > * Signed and encrypted communications preferred.
>> > _______________________________________________
>> > Philadelphia-pm mailing list
>> > Philadelphia-pm at pm.org
>> > http://mail.pm.org/mailman/listinfo/philadelphia-pm
>>
>> _______________________________________________
>> Philadelphia-pm mailing list
>> Philadelphia-pm at pm.org
>> http://mail.pm.org/mailman/listinfo/philadelphia-pm
>>
>>
>
>
> --
> - Dan Webster
>



-- 
- Dan Webster
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From waltman at pobox.com  Tue Dec  6 12:15:25 2011
From: waltman at pobox.com (Walt Mankowski)
Date: Tue, 6 Dec 2011 15:15:25 -0500
Subject: [Philadelphia-pm] Reminder: tech meeting Monday night,
	December 5
In-Reply-To: <20111205034701.GV3338@mawode.com>
References: <20111003050719.GB24966@mawode.com>
	<20111205034701.GV3338@mawode.com>
Message-ID: <20111206201525.GX3338@mawode.com>

On Sun, Dec 04, 2011 at 10:47:01PM -0500, Walt Mankowski wrote:
> Just wanted to send out a reminder about our December tech meeting.
> It will be tomorrow night, Monday December 5, at 7 PM, at our usual
> spot at 307 Levine Hall at Penn.
> 
> I'll be giving a talk on "Getting Started With Multithreaded Perl".
> It's basically the same talk I gave at YAPC in 2009, but I'm guessing
> most people haven't heard it. I did recently actually have an excuse
> to use threads in some research code I'm working on.  I munged that
> into some sample code that I can demo assuming my voice holds out that
> long. (I've on the tail end of a nasty chest cold.)

Thanks to everyone who came out last night and put up with my coughing
and raspy voice.  Aside from the title page, the slides I used last
night are identical to when I gave this talk in 2009 at YAPC::Europe.
Those can be downloaded at

http://www.mawode.com/~waltman/talks/perl_threads.yapceu09.pdf

The first Monday of January falls on the 2nd, which is a holiday. So
next we'll be meeting on the second Monday, which falls on January 9.

We need a speaker for January. Anyone have anything they want to talk
about?

Walt
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From john at kominetz.com  Tue Dec  6 14:25:29 2011
From: john at kominetz.com (John Kominetz)
Date: Tue, 6 Dec 2011 17:25:29 -0500
Subject: [Philadelphia-pm] Reminder: tech meeting Monday night,
	December 5
In-Reply-To: <20111206201525.GX3338@mawode.com>
References: <20111003050719.GB24966@mawode.com>
	<20111205034701.GV3338@mawode.com>
	<20111206201525.GX3338@mawode.com>
Message-ID: <CADTpxcNZw71FJ0whyoyk0vO1HbjV6tddq29VT65BC_9dit+Q5A@mail.gmail.com>

I have to say I was a little confused from the start because of the
statement that each thread was a complete interpreter. I "interpreted" that
as each thread was actually a separate PROCESS, and that all this was
hijacking threads as a metaphor for inter-process communication. So I wrote
a test with five threads that each waited for 30 seconds and watched the
activity monitor.  It reported one perl process with six threads, running
for 30 seconds. End of Duh.

That also renders moot my question about "threads" surviving beyond the
lifetime of the caller. Being real (OS) threads, that's not possible.
Changing my test from join() to detach(), the threads die unexpected,
untimely deaths as the process comes crashing down upon them.
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From rGeoffrey at PlatypiVentures.com  Tue Dec  6 14:54:25 2011
From: rGeoffrey at PlatypiVentures.com (R. Geoffrey Avery)
Date: Tue, 06 Dec 2011 17:54:25 -0500
Subject: [Philadelphia-pm] As mentioned Monday night, PLUG is on Wednesday
In-Reply-To: <CADTpxcNZw71FJ0whyoyk0vO1HbjV6tddq29VT65BC_9dit+Q5A@mail.g
	mail.com>
References: <20111003050719.GB24966@mawode.com>
	<20111205034701.GV3338@mawode.com>
	<20111206201525.GX3338@mawode.com>
	<CADTpxcNZw71FJ0whyoyk0vO1HbjV6tddq29VT65BC_9dit+Q5A@mail.gmail.com>
Message-ID: <6.2.3.4.2.20111206175218.029bc300@mail.PlatypiVentures.com>

Here is a link to the next PLUG meeting on Wednesday 12/7, a date 
which may or may not live in infamy:


"It Came from...HOLD SPACE! Alien Horrors from the Dawn of Unix" 
-  Mark Jason Dominus

http://www.phillylinux.org/meetings.html
600 South 43rd Street
Griffith Hall, Room "C"

7pm, talk starts about 8



From waltman at pobox.com  Tue Dec  6 15:13:30 2011
From: waltman at pobox.com (Walt Mankowski)
Date: Tue, 6 Dec 2011 18:13:30 -0500
Subject: [Philadelphia-pm] Reminder: tech meeting Monday night,
	December 5
In-Reply-To: <CADTpxcNZw71FJ0whyoyk0vO1HbjV6tddq29VT65BC_9dit+Q5A@mail.gmail.com>
References: <20111003050719.GB24966@mawode.com>
	<20111205034701.GV3338@mawode.com>
	<20111206201525.GX3338@mawode.com>
	<CADTpxcNZw71FJ0whyoyk0vO1HbjV6tddq29VT65BC_9dit+Q5A@mail.gmail.com>
Message-ID: <20111206231330.GY3338@mawode.com>

On Tue, Dec 06, 2011 at 05:25:29PM -0500, John Kominetz wrote:
> I have to say I was a little confused from the start because of the
> statement that each thread was a complete interpreter. I "interpreted" that
> as each thread was actually a separate PROCESS, and that all this was
> hijacking threads as a metaphor for inter-process communication. So I wrote
> a test with five threads that each waited for 30 seconds and watched the
> activity monitor.  It reported one perl process with six threads, running
> for 30 seconds. End of Duh.

In ithreads, there's one process for everything, and each perl thread
is a complete perl interpreter running inside an operating system
thread.

But you're partially right. Even though they are threads, because
they're isolated from each other, Perl has to do some magic internally
in order to share data. Also perl lets you do things that pthreads
doesn't allow, suck as dynamically sharing and unsharing variables at
run time.

What you described is actually what forks.pm does. That module lets
you use the same api as threads, but it instead of creating threads it
forks new processes. All the data sharing is done using sockets.

If I ever give this talk again, I'll try to be clearer about all this.

> That also renders moot my question about "threads" surviving beyond the
> lifetime of the caller. Being real (OS) threads, that's not possible.
> Changing my test from join() to detach(), the threads die unexpected,
> untimely deaths as the process comes crashing down upon them.

In fact the guy down at the other end of the room (sorry, I didn't
catch your name) had exactly that problem. He called me over to say
that he was trying to run one of my examples but it wasn't
working. Turned out he was calling detach() instead of join().

Walt
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