tcl-tdbc — Discussion of TDBC - Tcl DataBase Connectivity - TIP #308

[Tcl-tdbc] 2nd Call For Papers - 24th Annual Tcl/Tk Conference (Tcl'2017)

[<aku...@sh...>]

Hello tcl-tdbc, fyi ...

24th Annual Tcl/Tk Conference (Tcl'2017)
http://www.tcl.tk/community/tcl2017/

October 16 - 20, 2017
Crowne Plaza Houston River Oaks
2712 Southwest Freeway, 77098
Houston, Texas, USA

Important Dates:

Abstracts and proposals due   August 21, 2017
Notification to authors       August 28, 2017
WIP and BOF reservations open July 24, 2017
Author materials due          September 25, 2017
Tutorials Start               October 16, 2017
Conference starts             October 18, 2017

Email Contact:                tcl...@go...

Submission of Summaries

Tcl/Tk 2017 will be held in Houston, Texas, USA from October 16, 2017 to October 20, 2017.

The program committee is asking for papers and presentation proposals
from anyone using or developing with Tcl/Tk (and extensions). Past
conferences have seen submissions covering a wide variety of topics
including:

* Scientific and engineering applications
* Industrial controls
* Distributed applications and Network Managment
* Object oriented extensions to Tcl/Tk
* New widgets for Tk
* Simulation and application steering with Tcl/Tk
* Tcl/Tk-centric operating environments
* Tcl/Tk on small and embedded devices
* Medical applications and visualization
* Use of different programming paradigms in Tcl/Tk and proposals for new
  directions.
* New areas of exploration for the Tcl/Tk language

Submissions should consist of an abstract of about 100 words and a
summary of not more than two pages, and should be sent as plain text
to tcl...@go... no later than August 21, 2017. Authors of accepted
abstracts will have until September 25, 2017 to submit their final
paper for the inclusion in the conference proceedings. The proceedings
will be made available on digital media, so extra materials such as
presentation slides, code examples, code for extensions etc. are
encouraged.

Printed proceedings will be produced as an on-demand book at lulu.com

The authors will have 30 minutes to present their paper at
the conference.

The program committee will review and evaluate papers according to the
following criteria:

* Quantity and quality of novel content
* Relevance and interest to the Tcl/Tk community
* Suitability of content for presentation at the conference

Proposals may report on commercial or non-commercial systems, but
those with only blatant marketing content will not be accepted.

Application and experience papers need to strike a balance between
background on the application domain and the relevance of Tcl/Tk to
the application. Application and experience papers should clearly
explain how the application or experience illustrates a novel use of
Tcl/Tk, and what lessons the Tcl/Tk community can derive from the
application or experience to apply to their own development efforts.

Papers accompanied by non-disclosure agreements will be returned to
the author(s) unread. All submissions are held in the highest
confidentiality prior to publication in the Proceedings, both as a
matter of policy and in accord with the U. S. Copyright Act of 1976.

The primary author for each accepted paper will receive registration
to the Technical Sessions portion of the conference at a reduced rate.

Other Forms of Participation

The program committee also welcomes proposals for panel discussions of
up to 90 minutes. Proposals should include a list of confirmed
panelists, a title and format, and a panel description with position
statements from each panelist. Panels should have no more than four
speakers, including the panel moderator, and should allow time for
substantial interaction with attendees. Panels are not presentations
of related research papers.

Slots for Works-in-Progress (WIP) presentations and Birds-of-a-Feather
sessions (BOFs) are available on a first-come, first-served basis
starting in July 24, 2017. Specific instructions for reserving WIP
and BOF time slots will be provided in the registration information
available in July 24, 2017. Some WIP and BOF time slots will be held open
for on-site reservation. All attendees with an interesting work in
progress should consider reserving a WIP slot.

Registration Information

More information on the conference is available the conference Web
site (http://www.tcl.tk/community/tcl2017/) and will be published on
various Tcl/Tk-related information channels.

To keep in touch with news regarding the conference and Tcl events in
general, subscribe to the tcl-announce list. See:
http://code.activestate.com/lists/tcl-announce to subscribe to the
tcl-announce mailing list.


Conference Committee

   * Alexandre Ferrieux
   * Andreas Kupries    SUSE
   * Arjen Markus       Deltares
   * Brian Griffin      Mentor Graphics - A Siemens Business
   * Clif Flynt         Noumena Corp
   * Gerald Lester      KnG Consulting LLC
   * Joe Mistachkin     Mistachkin Systems
   * Ronald Fox         CAEN Technologies
                        NSCL @ Michigan State University
   * Steve Landers      Digital Smarties

Contact Information     tcl...@go...

Tcl'2017 would like to thank those who are sponsoring the conference:

   * FlightAware
   * Mentor Graphics - A Siemens Business
   * Noumena Corp
   * Tcl Community Association

[Tcl-tdbc] 1st Call For Papers - 24th Annual Tcl/Tk Conference (Tcl'2017)

[<aku...@sh...>]

Hello tcl-tdbc, fyi ...

24th Annual Tcl/Tk Conference (Tcl'2017)
http://www.tcl.tk/community/tcl2017/

October 16 - 20, 2017
Crowne Plaza Houston River Oaks
2712 Southwest Freeway, 77098
Houston, Texas, USA

Important Dates:

Abstracts and proposals due   August 21, 2017
Notification to authors       August 28, 2017
WIP and BOF reservations open July 24, 2017
Author materials due          September 25, 2017
Tutorials Start               October 16, 2017
Conference starts             October 18, 2017

Email Contact:                tcl...@go...

Submission of Summaries

Tcl/Tk 2017 will be held in Houston, Texas, USA from October 16, 2017 to October 20, 2017.

The program committee is asking for papers and presentation proposals
from anyone using or developing with Tcl/Tk (and extensions). Past
conferences have seen submissions covering a wide variety of topics
including:

* Scientific and engineering applications
* Industrial controls
* Distributed applications and Network Managment
* Object oriented extensions to Tcl/Tk
* New widgets for Tk
* Simulation and application steering with Tcl/Tk
* Tcl/Tk-centric operating environments
* Tcl/Tk on small and embedded devices
* Medical applications and visualization
* Use of different programming paradigms in Tcl/Tk and proposals for new
  directions.
* New areas of exploration for the Tcl/Tk language

Submissions should consist of an abstract of about 100 words and a
summary of not more than two pages, and should be sent as plain text
to tcl...@go... no later than August 21, 2017. Authors of accepted
abstracts will have until September 25, 2017 to submit their final
paper for the inclusion in the conference proceedings. The proceedings
will be made available on digital media, so extra materials such as
presentation slides, code examples, code for extensions etc. are
encouraged.

Printed proceedings will be produced as an on-demand book at lulu.com

The authors will have 30 minutes to present their paper at
the conference.

The program committee will review and evaluate papers according to the
following criteria:

* Quantity and quality of novel content
* Relevance and interest to the Tcl/Tk community
* Suitability of content for presentation at the conference

Proposals may report on commercial or non-commercial systems, but
those with only blatant marketing content will not be accepted.

Application and experience papers need to strike a balance between
background on the application domain and the relevance of Tcl/Tk to
the application. Application and experience papers should clearly
explain how the application or experience illustrates a novel use of
Tcl/Tk, and what lessons the Tcl/Tk community can derive from the
application or experience to apply to their own development efforts.

Papers accompanied by non-disclosure agreements will be returned to
the author(s) unread. All submissions are held in the highest
confidentiality prior to publication in the Proceedings, both as a
matter of policy and in accord with the U. S. Copyright Act of 1976.

The primary author for each accepted paper will receive registration
to the Technical Sessions portion of the conference at a reduced rate.

Other Forms of Participation

The program committee also welcomes proposals for panel discussions of
up to 90 minutes. Proposals should include a list of confirmed
panelists, a title and format, and a panel description with position
statements from each panelist. Panels should have no more than four
speakers, including the panel moderator, and should allow time for
substantial interaction with attendees. Panels are not presentations
of related research papers.

Slots for Works-in-Progress (WIP) presentations and Birds-of-a-Feather
sessions (BOFs) are available on a first-come, first-served basis
starting in July 24, 2017. Specific instructions for reserving WIP
and BOF time slots will be provided in the registration information
available in July 24, 2017. Some WIP and BOF time slots will be held open
for on-site reservation. All attendees with an interesting work in
progress should consider reserving a WIP slot.

Registration Information

More information on the conference is available the conference Web
site (http://www.tcl.tk/community/tcl2017/) and will be published on
various Tcl/Tk-related information channels.

To keep in touch with news regarding the conference and Tcl events in
general, subscribe to the tcl-announce list. See:
http://code.activestate.com/lists/tcl-announce to subscribe to the
tcl-announce mailing list.


Conference Committee

   * Alexandre Ferrieux
   * Andreas Kupries    SUSE
   * Arjen Markus       Deltares
   * Brian Griffin      Mentor Graphics - A Siemens Business
   * Clif Flynt         Noumena Corp
   * Gerald Lester      KnG Consulting LLC
   * Joe Mistachkin     Mistachkin Systems
   * Ronald Fox         CAEN Technologies
                        NSCL @ Michigan State University
   * Steve Landers      Digital Smarties

Contact Information     tcl...@go...

Tcl'2017 would like to thank those who are sponsoring the conference:

   * Noumena Corp
   * Tcl Community Association

[Tcl-tdbc] 3rd Call For Papers - 23rd Annual Tcl/Tk Conference (Tcl'2016)

[<aku...@sh...>]

Hello tcl-tdbc, fyi ...

23rd Annual Tcl/Tk Conference (Tcl'2016)
http://www.tcl.tk/community/tcl2016/

November 14 - 18, 2016
Crowne Plaza Houston River Oaks
2712 Southwest Freeway, 77098
Houston, Texas, USA

[[ 7...6...5...4...3...2...1...
   Attention! One week to the paper deadline
]]
[[ Attention! Registration is open! Please have a look at
   http://www.tcl.tk/community/tcl2016/register.html
]]

[[ Known Speakers
-- Tutorials

  * Clif Flynt - GUI Testing with tktest
                 Introduction to Tcl 1
                 Introduction to Tcl 2
                 Tcl on Android

  * Joe Mistachkin - Advanced Windows Integration with Eagle, Garuda, and Harpy

  * Sean Woods - Advanced TclOO & Megawidgets in TclOO
                 Building Tcl Extensions
                 Fun with CoRoutines

]]

Important Dates:

Abstracts and proposals due   September 12, 2016
Notification to authors       September 19, 2016
WIP and BOF reservations open August 22, 2016
Hotel Room Release            October 22, 2016
Author materials due          October 24, 2016
Tutorials Start               November 14, 2016
Conference starts             November 16, 2016

Email Contact:                tcl...@go...

Submission of Summaries

Tcl/Tk 2016 will be held in Houston, Texas, USA from November 14, 2016 to November 18, 2016.

The program committee is asking for papers and presentation proposals
from anyone using or developing with Tcl/Tk (and extensions). Past
conferences have seen submissions covering a wide variety of topics
including:

* Scientific and engineering applications
* Industrial controls
* Distributed applications and Network Managment
* Object oriented extensions to Tcl/Tk
* New widgets for Tk
* Simulation and application steering with Tcl/Tk
* Tcl/Tk-centric operating environments
* Tcl/Tk on small and embedded devices
* Medical applications and visualization
* Use of different programming paradigms in Tcl/Tk and proposals for new
  directions.
* New areas of exploration for the Tcl/Tk language

Note:
    We are especially interested in papers for OS X this time, to
    complement the keynote.

Submissions should consist of an abstract of about 100 words and a
summary of not more than two pages, and should be sent as plain text
to tcl...@go... no later than September 12, 2016. Authors of accepted
abstracts will have until October 24, 2016 to submit their final
paper for the inclusion in the conference proceedings. The proceedings
will be made available on digital media, so extra materials such as
presentation slides, code examples, code for extensions etc. are
encouraged.

Printed proceedings will be produced as an on-demand book at lulu.com

The authors will have 30 minutes to present their paper at
the conference.

The program committee will review and evaluate papers according to the
following criteria:

* Quantity and quality of novel content
* Relevance and interest to the Tcl/Tk community
* Suitability of content for presentation at the conference

Proposals may report on commercial or non-commercial systems, but
those with only blatant marketing content will not be accepted.

Application and experience papers need to strike a balance between
background on the application domain and the relevance of Tcl/Tk to
the application. Application and experience papers should clearly
explain how the application or experience illustrates a novel use of
Tcl/Tk, and what lessons the Tcl/Tk community can derive from the
application or experience to apply to their own development efforts.

Papers accompanied by non-disclosure agreements will be returned to
the author(s) unread. All submissions are held in the highest
confidentiality prior to publication in the Proceedings, both as a
matter of policy and in accord with the U. S. Copyright Act of 1976.

The primary author for each accepted paper will receive registration
to the Technical Sessions portion of the conference at a reduced rate.

Other Forms of Participation

The program committee also welcomes proposals for panel discussions of
up to 90 minutes. Proposals should include a list of confirmed
panelists, a title and format, and a panel description with position
statements from each panelist. Panels should have no more than four
speakers, including the panel moderator, and should allow time for
substantial interaction with attendees. Panels are not presentations
of related research papers.

Slots for Works-in-Progress (WIP) presentations and Birds-of-a-Feather
sessions (BOFs) are available on a first-come, first-served basis
starting in August 22, 2016. Specific instructions for reserving WIP
and BOF time slots will be provided in the registration information
available in August 22, 2016. Some WIP and BOF time slots will be held open
for on-site reservation. All attendees with an interesting work in
progress should consider reserving a WIP slot.

Registration Information

More information on the conference is available the conference Web
site (http://www.tcl.tk/community/tcl2016/) and will be published on
various Tcl/Tk-related information channels.

To keep in touch with news regarding the conference and Tcl events in
general, subscribe to the tcl-announce list. See:
http://code.activestate.com/lists/tcl-announce to subscribe to the
tcl-announce mailing list.


Conference Committee

   * Andreas Kupries Hewlett Packard Enterprise
   * Arjen Markus    Deltares
   * Brian Griffin   Mentor Graphics
   * Clif Flynt      Noumena Corp
   * Gerald Lester   KnG Consulting LLC
   * Joe Mistachkin  Mistachkin Systems
   * Ronald Fox      CAEN Technologies
                     NSCL @ Michigan State University
   * Steve Landers   Digital Smarties

Contact Information     tcl...@go...

Tcl'2016 would like to thank those who are sponsoring the conference:

   * ActiveState Inc
   * FlightAware
   * Mentor Graphics
   * Tcl Community Association

Re: [Tcl-tdbc] tdbc::mysql and multiple threads...

[Kevin K. <kk...@ny...>]

On 09/02/2016 08:40 AM, Georgios Petasis wrote:
> Dear Donal,
>
> At least one of the TODOs (the one with the thread init) is not a 
> pressing issue, as mysql_init() will also
> call  mysql_thread_init(), according to the manual. I am not sure 
> whether it is called more than one though.
> (I think that each new connection will call mysql_init()).
>
> In my code, the connection creation (or the connection close) is not 
> protected by a mutex. I will try to change this and see what happens.
>

I'm embarrassed - because tdbc::mysql has been out so long, and I never 
fixed this. (I seem to recall that someone else volunteered, and then 
never produced any code.)

What would be needed to make it thread-safe, and I don't think there's 
any less intrusive alternative, would be:

(1) Reorganize the initialization to link to libmysqlclient_r instead of 
libmysqlclient. The last time I took a run at that, it was not obvious 
that the thread-safe library exists on all the platforms, and I didn't 
have time to chase it at the time. (Now that I take a quick look at 
stackoverflow, it appears that MySQL 5.5 and beyond have made 
re-entrancy the default, and the _r version is a symlink to the version 
without the _r. I hope that's the case. I think I needed to worry more 
about compatibility with earlier versions when the code was first deployed.)

(2) Some of the libmysqlclient_r routines have different API's, and that 
will have to be adjusted in the code. I no longer recall details. I'd 
need to read up on it again. Once again, newer MySQL's may well have 
cleaned that up.

(3) Tdbcmysql_Init will have to call mysql_thread_init if it's the first 
initialization call in any given thread.

(4) The count of interps using MySQL in any given thread will have to be 
tracked in a TSD variable, because DeletePerInterpData will have to call 
mysql_thread_end when the last interpreter in a given thread goes away. 
Letting the library call mysql_thread_init by default and ignoring 
mysql_thread_end will result in resource leaks. (Also, I don't think 
that the default actually works in a multithreaded application - it's 
set up so that legacy single-threaded code doesn't need to upgrade to do 
the thread initialization.)

I vaguely recall at the time that I was struggling with unclear 
documentation as well as platform issues (does libmysqlclient_r even 
exist everywhere?), and that the mysql mailing list/IRC forum were 
singularly unhelpful - apparently I'm not cool enough to deserve a reply 
about such questions.

I'm no longer really tooled up to test this stuff. I don't have a 
Windows machine at home any more, and I'm pretty careful to keep a 
Chinese Wall between Tcl and GE, for several bad but inescapable 
reasons. I could probably work up a patch, but it would be Unix-only 
until someone else volunteered to port and test it - or to help set me 
up with a virtualized Windows if such a thing is possible.

If I've given enough information that someone else could volunteer to 
give this a go, that would be ideal. I've been horribly time-crunched 
for most of this year. Some of that looks, Deo volente, to be easing up 
- my daughter is now safely installed in her first apartment in a 
different city, and neither my wife nor I anticipate any more surgery in 
the immediate future (my wife had her second eye done on Thursday), but 
I have a lot of catching up to do on various other projects.

-- 
73 de ke9tv/2, Kevin

Re: [Tcl-tdbc] tdbc::mysql and multiple threads...

[Georgios P. <pet...@ya...>]

Dear Donal,

At least one of the TODOs (the one with the thread init) is not a 
pressing issue, as mysql_init() will also
call  mysql_thread_init(), according to the manual. I am not sure 
whether it is called more than one though.
(I think that each new connection will call mysql_init()).

In my code, the connection creation (or the connection close) is not 
protected by a mutex. I will try to change this and see what happens.

Regards,

George

On 2/9/2016 14:49, Donal K. Fellows wrote:
> On 02/09/2016 12:11, to...@tu... wrote:
>> Given what you write, it might be some part of tdbc (perhaps the *dbc
>> library?) isn't thread safe?
>
> The core of TDBC is thread-agnostic in the usual Tcl way; it's just 
> bound to an interpreter. If there is a problem, it's in the 
> tdbc::mysql driver package. If we look at the code:
>
> http://core.tcl-lang.org/tdbcmysql/artifact/47de19173a3e0d14?ln=1296-1306
>
> ... I might wonder based on the comment whether there is a problem. 
> There might be, but I don't know the mysql client library. Once open, 
> I'd expect connections to be interpreter-bound; that's how all of TDBC 
> is designed to work. (Heh, scanning through the code overall indicates 
> three places with “TODO” that might indicate something relevant, but I 
> don't know for sure.)
>
> I assume that if you put the actual connection creation guarded by a 
> mutex, which you can do easily enough from user code via the 
> primitives in the Thread package (i.e., you can check without changing 
> or recompiling the tdbc::mysql code), everything else after that will 
> work as well as the DB permits.
>
> Donal.
>
>
> ------------------------------------------------------------------------------
>
>
> _______________________________________________
> Tcl-tdbc mailing list
> Tcl...@li...
> https://lists.sourceforge.net/lists/listinfo/tcl-tdbc

Re: [Tcl-tdbc] tdbc::mysql and multiple threads...

[Georgios P. <pe...@ii...>]

Dear Donal,

At least one of the TODOs (the one with the thread init) is not a 
pressing issue, as mysql_init() will also
call  mysql_thread_init(), according to the manual. I am not sure 
whether it is called more than one though.
(I think that each new connection will call mysql_init()).

In my code, the connection creation (or the connection close) is not 
protected by a mutex. I will try to change this and see what happens.

Regards,

George

On 2/9/2016 14:49, Donal K. Fellows wrote:
> On 02/09/2016 12:11, to...@tu... wrote:
>> Given what you write, it might be some part of tdbc (perhaps the *dbc
>> library?) isn't thread safe?
>
> The core of TDBC is thread-agnostic in the usual Tcl way; it's just 
> bound to an interpreter. If there is a problem, it's in the 
> tdbc::mysql driver package. If we look at the code:
>
> http://core.tcl-lang.org/tdbcmysql/artifact/47de19173a3e0d14?ln=1296-1306
>
> ... I might wonder based on the comment whether there is a problem. 
> There might be, but I don't know the mysql client library. Once open, 
> I'd expect connections to be interpreter-bound; that's how all of TDBC 
> is designed to work. (Heh, scanning through the code overall indicates 
> three places with “TODO” that might indicate something relevant, but I 
> don't know for sure.)
>
> I assume that if you put the actual connection creation guarded by a 
> mutex, which you can do easily enough from user code via the 
> primitives in the Thread package (i.e., you can check without changing 
> or recompiling the tdbc::mysql code), everything else after that will 
> work as well as the DB permits.
>
> Donal.
>
>
> ------------------------------------------------------------------------------
>
>
> _______________________________________________
> Tcl-tdbc mailing list
> Tcl...@li...
> https://lists.sourceforge.net/lists/listinfo/tcl-tdbc

Re: [Tcl-tdbc] tdbc::mysql and multiple threads...

[Donal K. F. <don...@ma...>]

On 02/09/2016 12:11, to...@tu... wrote:
> Given what you write, it might be some part of tdbc (perhaps the *dbc
> library?) isn't thread safe?

The core of TDBC is thread-agnostic in the usual Tcl way; it's just 
bound to an interpreter. If there is a problem, it's in the tdbc::mysql 
driver package. If we look at the code:

   http://core.tcl-lang.org/tdbcmysql/artifact/47de19173a3e0d14?ln=1296-1306

... I might wonder based on the comment whether there is a problem. 
There might be, but I don't know the mysql client library. Once open, 
I'd expect connections to be interpreter-bound; that's how all of TDBC 
is designed to work. (Heh, scanning through the code overall indicates 
three places with “TODO” that might indicate something relevant, but I 
don't know for sure.)

I assume that if you put the actual connection creation guarded by a 
mutex, which you can do easily enough from user code via the primitives 
in the Thread package (i.e., you can check without changing or 
recompiling the tdbc::mysql code), everything else after that will work 
as well as the DB permits.

Donal.

Re: [Tcl-tdbc] tdbc::mysql and multiple threads...

[Georgios P. <pet...@ya...>]

On 2/9/2016 14:11, to...@tu... wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On Fri, Sep 02, 2016 at 01:36:36PM +0300, Georgios Petasis wrote:
>> On 2/9/2016 12:51, to...@tu... wrote:
>>> -----BEGIN PGP SIGNED MESSAGE-----
>>> Hash: SHA1
>>>
>>> On Fri, Sep 02, 2016 at 12:20:27PM +0300, Georgios Petasis wrote:
>>>> Hi all,
>>>>
>>>> I want to use a mysql database from multiple threads [...]
>>> Sorry, not really specific to tdbc, but from what I know about other
>>> similar interfaces: the database connection has a state [...]
>> Since I have a new connection per thread, I was expecting that begin
>> transaction/commit will be particular to each thread. However, they seem
>> to interfere, and mysql client gets confused. Or I am using tdbc::mysql
>> the wrong way.
> Ah, ok. Then, most of what i've written is moot :-)
>
> Given what you write, it might be some part of tdbc (perhaps the *dbc
> library?) isn't thread safe?
>
> A (admittedly superficial) net search didn't turn up relevant stuff for
> me, though.
>
To say the truth, I am not sure there is a problem in the tdbc mysql 
driver. I have just a quick look in the code,
and as soon as mysql_library_init() is called once, and then if 
mysql_init() is called on each thread, everything should be ok 
(according to the manual: 
https://dev.mysql.com/doc/refman/5.7/en/c-api-threaded-clients.html).

Regards,

George|| <https://dev.mysql.com/doc/refman/5.7/en/mysql-library-init.html>

Re: [Tcl-tdbc] tdbc::mysql and multiple threads...

[<to...@tu...>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Fri, Sep 02, 2016 at 01:36:36PM +0300, Georgios Petasis wrote:
> On 2/9/2016 12:51, to...@tu... wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > On Fri, Sep 02, 2016 at 12:20:27PM +0300, Georgios Petasis wrote:
> >> Hi all,
> >>
> >> I want to use a mysql database from multiple threads [...]

> > Sorry, not really specific to tdbc, but from what I know about other
> > similar interfaces: the database connection has a state [...]

> Since I have a new connection per thread, I was expecting that begin 
> transaction/commit will be particular to each thread. However, they seem 
> to interfere, and mysql client gets confused. Or I am using tdbc::mysql 
> the wrong way.

Ah, ok. Then, most of what i've written is moot :-)

Given what you write, it might be some part of tdbc (perhaps the *dbc
library?) isn't thread safe?

A (admittedly superficial) net search didn't turn up relevant stuff for
me, though.

Regards
- -- t
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Re: [Tcl-tdbc] tdbc::mysql and multiple threads...

[Georgios P. <pe...@ii...>]

On 2/9/2016 12:51, to...@tu... wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On Fri, Sep 02, 2016 at 12:20:27PM +0300, Georgios Petasis wrote:
>> Hi all,
>>
>> I want to use a mysql database from multiple threads. What I do right
>> now, is to load the packages from multiple threads, and use the database
>> as I would from a single thread.
>>
>> The problem is that I am getting errors when beginning transactions. The
>> errors are about locks, timetouts, etc.
> [...]
>
> Sorry, not really specific to tdbc, but from what I know about other
> similar interfaces: the database connection has a state, and this
> state doesn't expect to be "seen" by independent entities (be it threads
> or whatever).
>
> Possible approaches:
>
>   (1) Set up a separate connection handle for each thread.
I am creating a separate connection for each thread. Each thread has its 
own connection.
I am at the tcl level, using the thread package.
>
>   (2) Use some cunning scheme which somehow manages this
>       state, creating an illusion of a private handle
>       per client (instance). Traditionally this is called
>       "connection pooling" and implemented by having one
>       thread handling the mess on behalf of the others.
>
> That said, perhaps ODBC is smarter than I think and pretends to do
> that for you: then that'd be a bug :-)
>
> (Sorry if you knew all of this. Perhaps I just failed to gather that
> from your question).
Since I have a new connection per thread, I was expecting that begin 
transaction/commit will be particular to each thread. However, they seem 
to interfere, and mysql client gets confused. Or I am using tdbc::mysql 
the wrong way.

Is there any tdbc example, that accesses (any) database with threads, 
and has transactions?

Thank you for your answer,

George

Re: [Tcl-tdbc] tdbc::mysql and multiple threads...

[Georgios P. <pet...@ya...>]

On 2/9/2016 12:51, to...@tu... wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On Fri, Sep 02, 2016 at 12:20:27PM +0300, Georgios Petasis wrote:
>> Hi all,
>>
>> I want to use a mysql database from multiple threads. What I do right
>> now, is to load the packages from multiple threads, and use the database
>> as I would from a single thread.
>>
>> The problem is that I am getting errors when beginning transactions. The
>> errors are about locks, timetouts, etc.
> [...]
>
> Sorry, not really specific to tdbc, but from what I know about other
> similar interfaces: the database connection has a state, and this
> state doesn't expect to be "seen" by independent entities (be it threads
> or whatever).
>
> Possible approaches:
>
>   (1) Set up a separate connection handle for each thread.
I am creating a separate connection for each thread. Each thread has its 
own connection.
I am at the tcl level, using the thread package.
>
>   (2) Use some cunning scheme which somehow manages this
>       state, creating an illusion of a private handle
>       per client (instance). Traditionally this is called
>       "connection pooling" and implemented by having one
>       thread handling the mess on behalf of the others.
>
> That said, perhaps ODBC is smarter than I think and pretends to do
> that for you: then that'd be a bug :-)
>
> (Sorry if you knew all of this. Perhaps I just failed to gather that
> from your question).
Since I have a new connection per thread, I was expecting that begin 
transaction/commit will be particular to each thread. However, they seem 
to interfere, and mysql client gets confused. Or I am using tdbc::mysql 
the wrong way.

Is there any tdbc example, that accesses (any) database with threads, 
and has transactions?

Thank you for your answer,

George

Re: [Tcl-tdbc] tdbc::mysql and multiple threads...

[<to...@tu...>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Fri, Sep 02, 2016 at 12:20:27PM +0300, Georgios Petasis wrote:
> Hi all,
> 
> I want to use a mysql database from multiple threads. What I do right 
> now, is to load the packages from multiple threads, and use the database 
> as I would from a single thread.
> 
> The problem is that I am getting errors when beginning transactions. The 
> errors are about locks, timetouts, etc.

[...]

Sorry, not really specific to tdbc, but from what I know about other
similar interfaces: the database connection has a state, and this
state doesn't expect to be "seen" by independent entities (be it threads
or whatever).

Possible approaches:

 (1) Set up a separate connection handle for each thread.

 (2) Use some cunning scheme which somehow manages this
     state, creating an illusion of a private handle
     per client (instance). Traditionally this is called
     "connection pooling" and implemented by having one
     thread handling the mess on behalf of the others.

That said, perhaps ODBC is smarter than I think and pretends to do
that for you: then that'd be a bug :-)

(Sorry if you knew all of this. Perhaps I just failed to gather that
from your question).

regards
- -- t
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)

iEYEARECAAYFAlfJS5gACgkQBcgs9XrR2kY+UgCfTUhNOCXk13ZdmgesGftQqqyw
mNcAn1G4eCFzGLu0iWgI/GKTOfewvE3L
=17kQ
-----END PGP SIGNATURE-----

[Tcl-tdbc] tdbc::mysql and multiple threads...

[Georgios P. <pet...@ya...>]

Hi all,

I want to use a mysql database from multiple threads. What I do right 
now, is to load the packages from multiple threads, and use the database 
as I would from a single thread.

The problem is that I am getting errors when beginning transactions. The 
errors are about locks, timetouts, etc.

What is the suggested way to use a database from multiple threads? Is 
there an example/tutorial?

Regards,

George

[Tcl-tdbc] Re Miguel, from the family

[Andreas K. <aku...@sh...>]

Guido Sofer Inglesi <gu...@so...> asked me to pass this on:

"I'm Guido, Miguel Sofer's son. I would like to thank all the condolences
messages. Miguel has spent much time to tcl and he loved to do that. It's
very touching to see that his presence was admired by the community.
Warmest Regards to all. Guido."

-- 
Sincerely,
	Andreas Kupries <aku...@sh...>
			<http://core.tcl.tk/akupries/>
	Developer @	Hewlett Packard Enterprise

Tcl'2016, Nov 14-18, Houston, TX, USA. http://www.tcl.tk/community/tcl2016/
-------------------------------------------------------------------------------

Re: [Tcl-tdbc] [TCLCORE] RIP Miguel Sofer

[Colin M. <mc...@gm...>]

I received, from Miguel's wife, the sad news:

"I write to you to tell you that Miguel passed away on Monday June 13 th.
He left this world in absolute peace."

She also said, to you all:

"La cominudad Tcl era para Miguel una querida familia, cada nombre me
resuena con  mucho afecto y nostalgia. Me emociona saber de ustedes y del
dolor que compartimos por su pérdida"

Roughly interpreted:

"Miguel saw the Tcl community as family, every name resounding with a lot
of affection and nostalgia.  I am comforted that you share the pain I feel."

I would suggest, if you wish to offer Miguel's family condolences, you
might address them through his gmail account.  It seems the least intrusive
and most direct means of communication.

----

For my part, I have been working with Miguel closely for the last 18
months, and I don't have to tell you what a delightful guy he was, how much
his intelligence and great good humour added to every interaction, be it
work or play.

I was honoured to be able to work alongside him, our employer was fortunate
to have the benefit of his great expertise and skill.

Miguel had been diagnosed some years ago, and fought it to the end against
impossible odds.  I think he believed that he would prevail, which is why
he kept details close and private.  I don't think he saw much value in
burdening others.  I only knew of his daily struggle because we needed to
be able to schedule around treatments etc.  The happiest thought I have is
that he is past suffering.

Every time I use a coroutine, I will remember the great and gentle
intellect who provided them for us, whom I was pleased and privileged to
call 'Che.'

Colin.

Re: [Tcl-tdbc] [TCLCORE] RIP Miguel Sofer

[Steve L. <st...@di...>]

Gentle, intelligent, dedicated, generous - words that come to mind when remembering Miguel.

His legacy is immense. He will be missed.


> On 20 Jun 2016, at 1:28 AM, Andreas Kupries <aku...@sh...> wrote:
> 
> 
> The Tcl Core Team is saddened to learn that that long-time team
> member, Miguel Sofer, passed away on Monday, 13 June 2016, after a
> long illness. His tireless work on the development of Tcl will surely
> be missed, and we personally mourn the loss of a dear friend and
> colleague. Our sincerest sympathies and best wishes go out to Miguel's
> friends and family.
> 
> -- 
> May he be free and soar,
> 	Andreas Kupries <aku...@sh...>
> 			<http://core.tcl.tk/akupries/>
> 	Developer @	Hewlett Packard Enterprise
> 
> Tcl'2016, Nov 14-18, Houston, TX, USA. http://www.tcl.tk/community/tcl2016/
> -------------------------------------------------------------------------------
> 
> 
> 
> 
> 
> ------------------------------------------------------------------------------
> What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
> patterns at an interface-level. Reveals which users, apps, and protocols are 
> consuming the most bandwidth. Provides multi-vendor support for NetFlow, 
> J-Flow, sFlow and other flows. Make informed decisions using capacity planning
> reports. http://sdm.link/zohomanageengine
> _______________________________________________
> Tcl-Core mailing list
> Tcl...@li...
> https://lists.sourceforge.net/lists/listinfo/tcl-core

-Steve

Re: [Tcl-tdbc] [TCLCORE] [MACTCL] RIP Miguel Sofer

[Larry M. <lm...@bi...>]

If anyone knows how to contact his family please let me know.

FYI, I was emailing with Miguel not that long ago about crediting him
with some work he did in the Little language (byte code work, deep
dive).   He said:

"I'm ok. Hospital. Congrats. More later"

and I took to mean that he was OK.  Stupid me, he was saying he was OK
with the credits to him but he was in the hospital.  I completely 
misread it and I feel like a jerk.  That was April 21st so he had
been fighting whatever it was for months.

Again, if anyone has contact info for his family I'd like to pay my
respect and regret.

On Mon, Jun 20, 2016 at 07:56:44PM -0700, Andreas Kupries wrote:
> 
> > Does anyone know where we could send our condolences to his family?
> 
> Unfortunately I do not know.
> I got the information myself from Kevin Kenny.
> 
> > On Sun, Jun 19, 2016 at 11:28:59PM -0700, Andreas Kupries wrote:
> > > 
> > > The Tcl Core Team is saddened to learn that that long-time team
> > > member, Miguel Sofer, passed away on Monday, 13 June 2016, after a
> > > long illness. His tireless work on the development of Tcl will surely
> > > be missed, and we personally mourn the loss of a dear friend and
> > > colleague. Our sincerest sympathies and best wishes go out to Miguel's
> > > friends and family.
> > > 
> > > -- 
> > > May he be free and soar,
> > > 	Andreas Kupries <aku...@sh...>
> > > 			<http://core.tcl.tk/akupries/>
> > > 	Developer @	Hewlett Packard Enterprise
> 
> -- 
> Sincerely,
> 	Andreas Kupries <aku...@sh...>
> 			<http://core.tcl.tk/akupries/>
> 	Developer @	Hewlett Packard Enterprise
> 
> Tcl'2016, Nov 14-18, Houston, TX, USA. http://www.tcl.tk/community/tcl2016/
> -------------------------------------------------------------------------------
> 
> 
> 

-- 
---
Larry McVoy            	     lm at mcvoy.com             http://www.mcvoy.com/lm 

Re: [Tcl-tdbc] [TCLCORE] [MACTCL] RIP Miguel Sofer

[Andreas K. <aku...@sh...>]

> Does anyone know where we could send our condolences to his family?

Unfortunately I do not know.
I got the information myself from Kevin Kenny.

> On Sun, Jun 19, 2016 at 11:28:59PM -0700, Andreas Kupries wrote:
> > 
> > The Tcl Core Team is saddened to learn that that long-time team
> > member, Miguel Sofer, passed away on Monday, 13 June 2016, after a
> > long illness. His tireless work on the development of Tcl will surely
> > be missed, and we personally mourn the loss of a dear friend and
> > colleague. Our sincerest sympathies and best wishes go out to Miguel's
> > friends and family.
> > 
> > -- 
> > May he be free and soar,
> > 	Andreas Kupries <aku...@sh...>
> > 			<http://core.tcl.tk/akupries/>
> > 	Developer @	Hewlett Packard Enterprise

-- 
Sincerely,
	Andreas Kupries <aku...@sh...>
			<http://core.tcl.tk/akupries/>
	Developer @	Hewlett Packard Enterprise

Tcl'2016, Nov 14-18, Houston, TX, USA. http://www.tcl.tk/community/tcl2016/
-------------------------------------------------------------------------------

Re: [Tcl-tdbc] [Tcl-gsoc] RIP Miguel Sofer

[Clif F. <CL...@CF...>]

Hi,
  This is sad news. He was a nice guy and a pleasure to talk with at
the conferences. His understanding of the byte code engine will be hard
to replace.

  He will be missed for lots of reasons.

  Clif

On Sun, Jun 19, 2016 at 11:28:59PM -0700, Andreas Kupries wrote:
> 
> The Tcl Core Team is saddened to learn that that long-time team
> member, Miguel Sofer, passed away on Monday, 13 June 2016, after a
> long illness. His tireless work on the development of Tcl will surely
> be missed, and we personally mourn the loss of a dear friend and
> colleague. Our sincerest sympathies and best wishes go out to Miguel's
> friends and family.
> 
> -- 
> May he be free and soar,
> 	Andreas Kupries <aku...@sh...>
> 			<http://core.tcl.tk/akupries/>
> 	Developer @	Hewlett Packard Enterprise
> 
> Tcl'2016, Nov 14-18, Houston, TX, USA. http://www.tcl.tk/community/tcl2016/
> -------------------------------------------------------------------------------
> 
> 
> 
> 
> 
> ------------------------------------------------------------------------------
> What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
> patterns at an interface-level. Reveals which users, apps, and protocols are 
> consuming the most bandwidth. Provides multi-vendor support for NetFlow, 
> J-Flow, sFlow and other flows. Make informed decisions using capacity planning
> reports. http://sdm.link/zohomanageengine
> _______________________________________________
> Tcl-gsoc mailing list
> Tcl...@li...
> https://lists.sourceforge.net/lists/listinfo/tcl-gsoc

-- 
... Clif Flynt ... http://www.cwflynt.com ... cl...@cf... ...
.. Tcl/Tk: A Developer's Guide (3'd edition) - Morgan Kauffman ..
...23'nd Tcl/Tk Conference: Nov 14-18, 2016 - Houston TX, USA ...
.............  http://www.tcl.tk/community/tcl2016/  ............

Re: [Tcl-tdbc] [MACTCL] RIP Miguel Sofer

[Larry M. <lm...@mc...>]

Does anyone know where we could send our condolences to his family?

On Sun, Jun 19, 2016 at 11:28:59PM -0700, Andreas Kupries wrote:
> 
> The Tcl Core Team is saddened to learn that that long-time team
> member, Miguel Sofer, passed away on Monday, 13 June 2016, after a
> long illness. His tireless work on the development of Tcl will surely
> be missed, and we personally mourn the loss of a dear friend and
> colleague. Our sincerest sympathies and best wishes go out to Miguel's
> friends and family.
> 
> -- 
> May he be free and soar,
> 	Andreas Kupries <aku...@sh...>
> 			<http://core.tcl.tk/akupries/>
> 	Developer @	Hewlett Packard Enterprise
> 
> Tcl'2016, Nov 14-18, Houston, TX, USA. http://www.tcl.tk/community/tcl2016/
> -------------------------------------------------------------------------------
> 
> 
> 
> 
> 
> ------------------------------------------------------------------------------
> What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
> patterns at an interface-level. Reveals which users, apps, and protocols are 
> consuming the most bandwidth. Provides multi-vendor support for NetFlow, 
> J-Flow, sFlow and other flows. Make informed decisions using capacity planning
> reports. http://sdm.link/zohomanageengine
> _______________________________________________
> Tcl-mac mailing list
> tc...@li...
> https://lists.sourceforge.net/lists/listinfo/tcl-mac

-- 
---
Larry McVoy            	     lm at mcvoy.com             http://www.mcvoy.com/lm 

Re: [Tcl-tdbc] [TCLCORE] RIP Miguel Sofer

[<fre...@fr...>]

Sad news. RIP.

> The Tcl Core Team is saddened to learn that that long-time team
> member, Miguel Sofer, passed away on Monday, 13 June 2016, after a
> long illness. His tireless work on the development of Tcl will surely
> be missed, and we personally mourn the loss of a dear friend and
> colleague. Our sincerest sympathies and best wishes go out to
> Miguel's
> friends and family.
> 
> --
> May he be free and soar,

[Tcl-tdbc] RIP Miguel Sofer

[Andreas K. <aku...@sh...>]

The Tcl Core Team is saddened to learn that that long-time team
member, Miguel Sofer, passed away on Monday, 13 June 2016, after a
long illness. His tireless work on the development of Tcl will surely
be missed, and we personally mourn the loss of a dear friend and
colleague. Our sincerest sympathies and best wishes go out to Miguel's
friends and family.

-- 
May he be free and soar,
	Andreas Kupries <aku...@sh...>
			<http://core.tcl.tk/akupries/>
	Developer @	Hewlett Packard Enterprise

Tcl'2016, Nov 14-18, Houston, TX, USA. http://www.tcl.tk/community/tcl2016/
-------------------------------------------------------------------------------

[Tcl-tdbc] 2nd Call For Papers - 23rd Annual Tcl/Tk Conference (Tcl'2016)

[<aku...@sh...>]

Hello tcl-tdbc, fyi ...

23rd Annual Tcl/Tk Conference (Tcl'2016)
http://www.tcl.tk/community/tcl2016/

November 14 - 18, 2016
Crowne Plaza Houston River Oaks
2712 Southwest Freeway, 77098
Houston, Texas, USA

Important Dates:

[[ Attention!
   Registration is open. Please have a look at
        http://www.tcl.tk/community/tcl2016/register.html

   The tutorials are known. See
        http://www.tcl.tk/community/tcl2016/tutorials.html
]]

Abstracts and proposals due   September 12, 2016
Notification to authors       September 19, 2016
WIP and BOF reservations open August 22, 2016
Author materials due          October 24, 2016
Tutorials Start               November 14, 2016
Conference starts             November 16, 2016

Email Contact:                tcl...@go...

Submission of Summaries

Tcl/Tk 2016 will be held in Houston, Texas, USA from November 14, 2016 to November 18, 2016.

The program committee is asking for papers and presentation proposals
from anyone using or developing with Tcl/Tk (and extensions). Past
conferences have seen submissions covering a wide variety of topics
including:

* Scientific and engineering applications
* Industrial controls
* Distributed applications and Network Managment
* Object oriented extensions to Tcl/Tk
* New widgets for Tk
* Simulation and application steering with Tcl/Tk
* Tcl/Tk-centric operating environments
* Tcl/Tk on small and embedded devices
* Medical applications and visualization
* Use of different programming paradigms in Tcl/Tk and proposals for new
  directions.
* New areas of exploration for the Tcl/Tk language

Submissions should consist of an abstract of about 100 words and a
summary of not more than two pages, and should be sent as plain text
to tcl...@go... no later than September 12, 2016. Authors of accepted
abstracts will have until October 24, 2016 to submit their final
paper for the inclusion in the conference proceedings. The proceedings
will be made available on digital media, so extra materials such as
presentation slides, code examples, code for extensions etc. are
encouraged.

Printed proceedings will be produced as an on-demand book at lulu.com

The authors will have 30 minutes to present their paper at
the conference.

The program committee will review and evaluate papers according to the
following criteria:

* Quantity and quality of novel content
* Relevance and interest to the Tcl/Tk community
* Suitability of content for presentation at the conference

Proposals may report on commercial or non-commercial systems, but
those with only blatant marketing content will not be accepted.

Application and experience papers need to strike a balance between
background on the application domain and the relevance of Tcl/Tk to
the application. Application and experience papers should clearly
explain how the application or experience illustrates a novel use of
Tcl/Tk, and what lessons the Tcl/Tk community can derive from the
application or experience to apply to their own development efforts.

Papers accompanied by non-disclosure agreements will be returned to
the author(s) unread. All submissions are held in the highest
confidentiality prior to publication in the Proceedings, both as a
matter of policy and in accord with the U. S. Copyright Act of 1976.

The primary author for each accepted paper will receive registration
to the Technical Sessions portion of the conference at a reduced rate.

Other Forms of Participation

The program committee also welcomes proposals for panel discussions of
up to 90 minutes. Proposals should include a list of confirmed
panelists, a title and format, and a panel description with position
statements from each panelist. Panels should have no more than four
speakers, including the panel moderator, and should allow time for
substantial interaction with attendees. Panels are not presentations
of related research papers.

Slots for Works-in-Progress (WIP) presentations and Birds-of-a-Feather
sessions (BOFs) are available on a first-come, first-served basis
starting in August 22, 2016. Specific instructions for reserving WIP
and BOF time slots will be provided in the registration information
available in August 22, 2016. Some WIP and BOF time slots will be held open
for on-site reservation. All attendees with an interesting work in
progress should consider reserving a WIP slot.

Registration Information

More information on the conference is available the conference Web
site (http://www.tcl.tk/community/tcl2016/) and will be published on
various Tcl/Tk-related information channels.

To keep in touch with news regarding the conference and Tcl events in
general, subscribe to the tcl-announce list. See:
http://code.activestate.com/lists/tcl-announce to subscribe to the
tcl-announce mailing list.


Conference Committee

   * Andreas Kupries Hewlett Packard Enterprise
   * Arjen Markus    Deltares
   * Brian Griffin   Mentor Graphics
   * Clif Flynt      Noumena Corp
   * Gerald Lester   KnG Consulting LLC
   * Joe Mistachkin  Mistachkin Systems
   * Ronald Fox      CAEN Technologies
                     NSCL @ Michigan State University
   * Steve Landers   Digital Smarties

Contact Information     tcl...@go...

Tcl'2016 would like to thank those who are sponsoring the conference:

   * Mentor Graphics
   * Tcl Community Association

[Tcl-tdbc] 1st Call For Papers - 23rd Annual Tcl/Tk Conference (Tcl'2016)

[<aku...@sh...>]

Hello tcl-tdbc, fyi ...

23rd Annual Tcl/Tk Conference (Tcl'2016)
http://www.tcl.tk/community/tcl2016/

November 14 - 18, 2016
Crowne Plaza Houston River Oaks
2712 Southwest Freeway, 77098
Houston, Texas, USA

Important Dates:

Abstracts and proposals due   September 12, 2016
Notification to authors       September 19, 2016
WIP and BOF reservations open August 22, 2016
Author materials due          October 24, 2016
Tutorials Start               November 14, 2016
Conference starts             November 16, 2016

Email Contact:                tcl...@go...

Submission of Summaries

Tcl/Tk 2016 will be held in Houston, Texas, USA from November 14, 2016 to November 18, 2016.

The program committee is asking for papers and presentation proposals
from anyone using or developing with Tcl/Tk (and extensions). Past
conferences have seen submissions covering a wide variety of topics
including:

* Scientific and engineering applications
* Industrial controls
* Distributed applications and Network Managment
* Object oriented extensions to Tcl/Tk
* New widgets for Tk
* Simulation and application steering with Tcl/Tk
* Tcl/Tk-centric operating environments
* Tcl/Tk on small and embedded devices
* Medical applications and visualization
* Use of different programming paradigms in Tcl/Tk and proposals for new
  directions.
* New areas of exploration for the Tcl/Tk language

Submissions should consist of an abstract of about 100 words and a
summary of not more than two pages, and should be sent as plain text
to tcl...@go... no later than September 12, 2016. Authors of accepted
abstracts will have until October 24, 2016 to submit their final
paper for the inclusion in the conference proceedings. The proceedings
will be made available on digital media, so extra materials such as
presentation slides, code examples, code for extensions etc. are
encouraged.

Printed proceedings will be produced as an on-demand book at lulu.com

The authors will have 30 minutes to present their paper at
the conference.

The program committee will review and evaluate papers according to the
following criteria:

* Quantity and quality of novel content
* Relevance and interest to the Tcl/Tk community
* Suitability of content for presentation at the conference

Proposals may report on commercial or non-commercial systems, but
those with only blatant marketing content will not be accepted.

Application and experience papers need to strike a balance between
background on the application domain and the relevance of Tcl/Tk to
the application. Application and experience papers should clearly
explain how the application or experience illustrates a novel use of
Tcl/Tk, and what lessons the Tcl/Tk community can derive from the
application or experience to apply to their own development efforts.

Papers accompanied by non-disclosure agreements will be returned to
the author(s) unread. All submissions are held in the highest
confidentiality prior to publication in the Proceedings, both as a
matter of policy and in accord with the U. S. Copyright Act of 1976.

The primary author for each accepted paper will receive registration
to the Technical Sessions portion of the conference at a reduced rate.

Other Forms of Participation

The program committee also welcomes proposals for panel discussions of
up to 90 minutes. Proposals should include a list of confirmed
panelists, a title and format, and a panel description with position
statements from each panelist. Panels should have no more than four
speakers, including the panel moderator, and should allow time for
substantial interaction with attendees. Panels are not presentations
of related research papers.

Slots for Works-in-Progress (WIP) presentations and Birds-of-a-Feather
sessions (BOFs) are available on a first-come, first-served basis
starting in August 22, 2016. Specific instructions for reserving WIP
and BOF time slots will be provided in the registration information
available in August 22, 2016. Some WIP and BOF time slots will be held open
for on-site reservation. All attendees with an interesting work in
progress should consider reserving a WIP slot.

Registration Information

More information on the conference is available the conference Web
site (http://www.tcl.tk/community/tcl2016/) and will be published on
various Tcl/Tk-related information channels.

To keep in touch with news regarding the conference and Tcl events in
general, subscribe to the tcl-announce list. See:
http://code.activestate.com/lists/tcl-announce to subscribe to the
tcl-announce mailing list.


Conference Committee

   * Andreas Kupries Hewlett Packard Enterprise
   * Arjen Markus    Deltares
   * Brian Griffin   Mentor Graphics
   * Clif Flynt      Noumena Corp
   * Gerald Lester   KnG Consulting LLC
   * Joe Mistachkin  Mistachkin Systems
   * Ronald Fox      CAEN Technologies
                     NSCL @ Michigan State University

Contact Information     tcl...@go...

Tcl'2016 would like to thank those who are sponsoring the conference:

   * Mentor Graphics
   * Tcl Community Association

[Tcl-tdbc] 3rd Call For Papers - 22nd Annual Tcl/Tk Conference (Tcl'2015)

[<and...@ac...>]

Hello tcl-tdbc, fyi ...

22nd Annual Tcl/Tk Conference (Tcl'2015)
http://www.tcl.tk/community/tcl2015/

October 19 - 23, 2015
Comfort Suites Manassas
7350 Williamson Blvd, 20109
Manassas, Virginia, USA

[[ Attention! One month to the paper deadline ]]

[[ Attention! Registration is open! Please have a look at
   http://www.tcl.tk/community/tcl2015/register.html
]]

[[ Known Speakers
-- Keynotes

  * Kevin Walzer - Tk on the Mac: Past, Present, Future

-- Tutorials

  * Clif Flynt - Advanced Tcl: TclOO Intro
                 New Tcl/Tk Platforms --- Pi and Android

  * Gerald Lester - Introduction to Tcl 1
                    Introduction to Tcl 2
                    Introduction to Tk 1
                    Programming the Web with Tcl: A Survey of Tools, Tips and Tricks

  * Sean Woods - Advanced TclOO & Megawidgets in TclOO

]]

Important Dates:

Abstracts and proposals due   August 24, 2015
Notification to authors       August 31, 2015
WIP and BOF reservations open July 27, 2015
Hotel Room Release            August 25, 2015
Author materials due          September 28, 2015
Tutorials Start               October 19, 2015
Conference starts             October 21, 2015

Email Contact:                tcl...@go...

Submission of Summaries

Tcl/Tk 2015 will be held in Manassas, Virginia, USA from October 19, 2015 to October 23, 2015.

The program committee is asking for papers and presentation proposals
from anyone using or developing with Tcl/Tk (and extensions). Past
conferences have seen submissions covering a wide variety of topics
including:

* Scientific and engineering applications
* Industrial controls
* Distributed applications and Network Managment
* Object oriented extensions to Tcl/Tk
* New widgets for Tk
* Simulation and application steering with Tcl/Tk
* Tcl/Tk-centric operating environments
* Tcl/Tk on small and embedded devices
* Medical applications and visualization
* Use of different programming paradigms in Tcl/Tk and proposals for new
  directions.
* New areas of exploration for the Tcl/Tk language

Note:
    We are especially interested in papers for OS X this time, to
    complement the keynote.

Submissions should consist of an abstract of about 100 words and a
summary of not more than two pages, and should be sent as plain text
to tcl...@go... no later than August 24, 2015. Authors of accepted
abstracts will have until September 28, 2015 to submit their final
paper for the inclusion in the conference proceedings. The proceedings
will be made available on digital media, so extra materials such as
presentation slides, code examples, code for extensions etc. are
encouraged.

Printed proceedings will be produced as an on-demand book at lulu.com

The authors will have 30 minutes to present their paper at
the conference.

The program committee will review and evaluate papers according to the
following criteria:

* Quantity and quality of novel content
* Relevance and interest to the Tcl/Tk community
* Suitability of content for presentation at the conference

Proposals may report on commercial or non-commercial systems, but
those with only blatant marketing content will not be accepted.

Application and experience papers need to strike a balance between
background on the application domain and the relevance of Tcl/Tk to
the application. Application and experience papers should clearly
explain how the application or experience illustrates a novel use of
Tcl/Tk, and what lessons the Tcl/Tk community can derive from the
application or experience to apply to their own development efforts.

Papers accompanied by non-disclosure agreements will be returned to
the author(s) unread. All submissions are held in the highest
confidentiality prior to publication in the Proceedings, both as a
matter of policy and in accord with the U. S. Copyright Act of 1976.

The primary author for each accepted paper will receive registration
to the Technical Sessions portion of the conference at a reduced rate.

Other Forms of Participation

The program committee also welcomes proposals for panel discussions of
up to 90 minutes. Proposals should include a list of confirmed
panelists, a title and format, and a panel description with position
statements from each panelist. Panels should have no more than four
speakers, including the panel moderator, and should allow time for
substantial interaction with attendees. Panels are not presentations
of related research papers.

Slots for Works-in-Progress (WIP) presentations and Birds-of-a-Feather
sessions (BOFs) are available on a first-come, first-served basis
starting in July 27, 2015. Specific instructions for reserving WIP
and BOF time slots will be provided in the registration information
available in July 27, 2015. Some WIP and BOF time slots will be held open
for on-site reservation. All attendees with an interesting work in
progress should consider reserving a WIP slot.

Registration Information

More information on the conference is available the conference Web
site (http://www.tcl.tk/community/tcl2015/) and will be published on
various Tcl/Tk-related information channels.

To keep in touch with news regarding the conference and Tcl events in
general, subscribe to the tcl-announce list. See:
http://code.activestate.com/lists/tcl-announce to subscribe to the
tcl-announce mailing list.


Conference Committee

   * Andreas Kupries  ActiveState Inc
   * Arjen Markus     Deltares
   * Brian Griffin    Mentor Graphics
   * Clif Flynt       Noumena Corp
   * Cynthia Lilagan  National Museum of Health & Medicine, Chicago
   * Donal Fellows    University of Manchester
   * Gerald Lester    KnG Consulting LLC
   * Jeff Hobbs       ActiveState Inc
   * Joe Mistachkin   Mistachkin Systems
   * Kevin Kenny      GE Global Research Center
   * Larry Virden
   * Mike Doyle       National Museum of Health & Medicine, Chicago
   * Ronald Fox       CAEN Technologies
                      NSCL @ Michigan State University
   * Steve Landers    Digital Smarties
   * Steve Redler, IV SR Technology

Contact Information     tcl...@go...

Tcl'2015 would like to thank those who are sponsoring the conference:

   * ActiveState Inc
   * Buonacorsi Foundation
   * Mentor Graphics
   * Noumena Corp
   * SR Technology
   * Tcl Community Association