Synchronous Interprocess Messaging Project for LINUX (SIMPL)

Please feel free to visit the SIMPL project on Sourceforge.net also.

If you are using (or thinking of using) the SIMPL toolkit in your project consider the SIMPL coaching service.

Some online demos of the sample code from the 2nd Edition of the SIMPL book are available here.
 

2014Jan06 SIMPL-Python v3.0.1 binary for Raspberry Pi Released - first release of the self installing archive for SIMPL-Python v3.0.1 compiled for Raspberry Pi; 2013Jul05 SIMPL-Arduino v1.0.1 Released - first release of the SIMPL-Arduino API; SIMPL-Arduino source self installing archive 2013Jun26 SIMPL-Python v3.0.1 Released - major rework of SIMPL-Python API to allow compatibility with Python3.x; SIMPL-Python source self installing archive; 2012Oct30 SIMPL v3.3.8 Released - fixed name_attach rc bug, more Cygwin hooks; SIMPL source self installing archive; 2012Jan26 SIMPL v3.3.7 Released - enabling Mac and Cygwin compiles; SIMPL source self installing archive; 2010Oct25 SIMPL v3.3.5 Released - message near page size bug fixed; SIMPL source self installing archive; 2010May14 Programming the SIMPL Way - Second Edition - book has been published 2010Feb18 SIMPL-Python v2.0.0 Released - major reworking of SIMPL-Python modules; SIMPL-Python source self installing archive; and the SIMPL-Python precompiled binary self installing archive 2010Feb11 SIMPL v3.3.4 Released - surrogates no longer create zombies upon child exit; SIMPL source self installing archive; SIMPL precompiled binary self installing archive 2010Jan08 SIMPL v3.3.3 Released - replaces PAGE_SIZE with POSIX _SC_PAGESIZE 2009Aug27 SIMPL v3.3.2 Released - adds whatsMyRecvPtr() and whatsMyReplyPtr() 2009May06 SIMPL-JAVA v0.2.0 Released - JNI base library for JAVA and tclSurrogate protocol library for JAVA; SIMPL-JAVA self installing archive; and the SIMPL-JAVA precompiled binary self installing archive 2009Apr22 SIMPL-Python precompiled binary (i386) v1.3.1 Released 2009Apr21 SIMPL-Tcl/Tk precompiled binary (i386) v1.5.1 Released 2009Mar31 SIMPL-JAVA v0.1.0 Released - JNI base library for JAVA; introduces the SIMPL-JAVA self installing archive; and the SIMPL-JAVA precompiled binary self installing archive 2009Jan27 SIMPL-Python v1.3.1 Released - tclSurrogate protocol library for Python; SIMPL-Python web application interface ; introduces SIMPL-Python self installing archive 2009Jan27 SIMPL-Tcl/Tk v1.5 Released - tclSurrogate relocated to main tarball ; introduces SIMPL-Tcl/Tk self installing archive 2009Jan27 SIMPL v3.3.0 Released - reorganizes SIMPL core tarball ;tclSurrogate now under surrogates; /var/tmp as default for FIFO_PATH ; introduces SIMPL self installing archive 2008Dec01 SIMPLv3.2.2 Released - reworks several Makefiles to better conform with Debian standards 2008Nov17 SIMPL Tcl hooks v1.4 released - help trap the dependency on Tcl/Tk sources in buildsimpl.tcl script. 2008Nov17 SIMPL Python hooks v1.2 released - help trap the dependency on Python sources in buildsimpl.python script. Programming the SIMPL Way - book has been published --> 2008Oct07 Programming the SIMPL Way - book has been published 2008May12 SIMPLv3.2.1 Released - fixes some build problems with previous release 2008Apr22 SIMPLv3.2.0 Released - adds new RS232 surrogate and defaults TCP/IP surrogate to intersurrogate text headers 2008Mar05 SIMPL Tcl hooks v1.3 released - minor bug fixes 2007Aug08 The creators of the SIMPL toolkit are writing a book. If you want to be notified when the book gets published click here. 2007July24 new version of SIMPL Tcl hooks - adds trusted network capabilities 2007May15 SIMPLv3.1.2 released -  removes debug simpl_log messages 2007Jan15 SIMPLv3.1.1 released -  minor bug fixes;  corrected a possible runaway condition in TCP/IP surrogate 06Aug16 the tclSurrogate protocol is finally documented.   This protocol is very useful in connecting disparate systems to SIMPL systems via a TCP/IP socket. 2006Aug14 SIMPLv3.1.0 released -  added Relay() to SIMPL API and split Tcl/Tk and Python hooks from top level build and tarball 2006June26 several new softwareICs released -  the new tarball contains code for a scheduler, a proxy and a statemachine ... for more info see softwareIC page 2006Apr24 SIMPLv3.0.3 released -  added b_port option to surrogateTcp to allow for proxy testing 2006Mar01 the SIMPL coach service articulated 2006Feb07 SIMPLv3.0.2 released -  minor bug fix release which tweeks code associated with the Tcl surrogate 2006Jan10 SIMPLv3.0.1 released -  minor bug fix release which corrects a couple of missing files from tarball 2006Jan10 SIMPLv3.0.0 released -  v3.0 remerges the tcp_x back into the surrogate codebase and simplifies the protocol router interface 2005Dec20  SIMPL example code - the fcnet network checker code added 2005Dec20  SIMPLv2.5.0 released - third prerelease of v3.0 surrogate as ~/tcp_x with check for existence algorithm in surrogates 2005Nov14  SIMPLv2.4.1 released - fixed so that surrogateTcp_x can coexist with surrogateTcp 2005Nov14  SIMPL unit test scripts - the SIMPL unit testing infrastructure.   See ~/docs/readme.testing 2005Nov12  SIMPLv2.4.0 released - first prerelease of the new v3.0 surrogate stuff as ~/tcp_x 2005Oct27 SIMP3.0 roadmap 2005Sept29  SIMPLv2.3.6 released - fixed the Trigger error in name_detach() logic which 2.3.5 patches introduced 2005Sept26  SIMPLv2.3.5 released - fix in proxy logic for possibility that shmid=0 2005Apr19  SIMPLv2.3.4 released - minor bug fix in the remote name_locate() error reporting and possible buffer overflow 2005Feb9  SIMPLv2.3.3 released - minor bug fix in the Trigger() which permits proxyID of zero to be valid 2004Nov19  SIMPLv2.3.2 released - minor bug fix in the Trigger() proxy  which now allows proxyID to be used 2004Oct28  SIMPLv2.3.1 released - minor bug fix in the name_locate algorithm which affects SIMPL names common root portion 2004Oct19 SIMPL selfhosted(live)CD ISO image available 2004July20  SIMPLv2.3.0 released - significant release,  changes to sender write() detection algorithm 2004July11  SIMPLv2.2.5 released - minor bug fix in theTcl/Tk shared library 2004May20 SIMPL mailing list switching to Yahoo Groups because I'm tired of manually administering the 4-5 daily spam messages which can't be automatically filtered out of the Sourceforge mailing list system.    Please resubscribe yourself to the new list. 2004May6  SIMPLv2.2.4 released - minor bug fixes in duplicate name detection algorithm and Python build 2004Apr28 SIMPL project looking for new maintainer of surrogate subsystem code, SIMPL Python and SIMPL MAC 2004Apr28  SIMPL for QNX update 2003Dec8 SIMPLv2.2.3 released - minor bug fixes in child_detach() 2003Nov6 multithread patch v0.2 released continued

Our mission

• intuitive and simple to understand (think function call)
• an immensely powerful way of designing distributed software applications

What have we done thus far?

• blocking message send
• blocking message receive
• non blocking message reply
• non blocking proxy send
• name attach, detach, and locate

• Tcl/Tk shared library which provides Send/Receive/Reply extensions
• hooks so that SIMPL apps can be written in Python
• simple trace logger process with maskable log levels
• a QNX compatible library suitable for porting
• template for virtual circuit processes to allow messaging to be carried transparently over a communication link
• network wide name locate and virtual circuits for TCP/IP sockets
• Tcl/Tk protocol which extends Send/Receive/Reply to tclets,  Window boxes,   network appliances
• a collection of  SIMPL software IC's ... highly reusable constructs in the spirit of their hardware counterparts

-->	The creators of the SIMPL toolkit have written a book. Google Books has a preview here.

Base version 3.3.0 (~110k) (installation instructions )
Less tested version 3.3.4 (~110k) (changes from base version; self installing archive )

SIMPL unit testing scripts(~8k) ( installation instructions for the SIMPL testing framework)

Tcl/Tk hooks to SIMPL (~25k) (installation instructions for SIMPL-Tcl/Tk) ; SIMPL-Tcl/Tk self installing archive ) ; SIMPL-Tcl/Tk precompiled binary self installing archive )

Python hooks to SIMPL (~25k) (installation instructions for SIMPL-Python ) ; SIMPL-Python self installing archive ) ; SIMPL-Python precompiled binary self installing archive )

JAVA hooks to SIMPL (~25k) (installation instructions for SIMPL-JAVA ) ; (SIMPL-JAVA self installing archive ) ; (SIMPL-JAVA precompiled binary self installing archive )

Source for some examples (~25k) (installation instructions for examples )
Source for some tutorials (~15k) (installation instructions for tutorials )
RCS virtual tree scripts (~7k)
SIMPL for QNX  (~28k)
multithread patch v0.2    (installation instructions for multithread patch)

Other SIMPL literature

Raspberry Pi article about SIMPL for this embedded Linux platform in issue #4.
TLUG presentation 99Nov9 - to install and view simply undo the tar.gz and point browser at TLUG_1.html
Linux Journal Issue #79 pg.150 - paper entitled "Software ICs"

How do I get involved?

Contact and use our mailing list.

• To subscribe to the mailing list, simply send a blank email to simpl-mail-subscribe[AT]yahoogroups.com   You will then get back a confirmation email from the mailing list server to which you simply reply.
• To talk to the mailing list simply send email to simpl-mail[AT]yahoogroups.com

The SIMPL mailing list archive can be found here .

As it is with any Open Source project,  the SIMPL project can only grow and prosper if the people using the code give something back in return.

If you are an experienced LINUX developer or kernel hacker we certainly could use your contributions.

Our code is written with the KISS philosphy in mind. As such even a novice C programmer could study and understand the code. So even if you are just starting out as a LINUX developer your contribution to this effort is welcome. We will make every reasonable effort to help you get going and support you along the way.

There is an online course available from iCanProgram.com which teaches the basics of  LINUX programming the SIMPL way.

Other contributions and related links

• The SIMPL toolkit has been cross compiled for the Plug Computer.
• One of the iCanProgram students has assembled a variation of Puppy Linux which contains the SIMPL toolkit.
• M. Khaymov of Condoplex Monitoring Systems has contributed an alternate surrogate implementation.   No test results were submitted but the author claims compatibility with SIMPL 2.3.6.
• the closed thing to "SIMPL on silicon" is embodied in an appliance produced by IO Anywhere Inc.
• One of the SIMPL participants, Sam Roberts formerly of Cogent Real-Time Systems   has developed Linux module to implement a very functional QNX API. . This module is LGPL'd and is currently being maintained by Cogent.
• the other kernel based version written by John Collins  called SIPC has been retained as a separate tarball.
• Another of the SIMPL participants, Andre Koppel, has recently made his QNX4LINUX library available. Please beware that Andre's library is copywrited by himself but the source is provided and free for noncommercial use. Contact Andre directly for any questions or comments regarding his work. We have reproduced his readme here for your information.
• one of the nice things to have with the SIMPL system would be a small embedable GUI. The MicroWindows project has some interesting synergies.
• in the "I could not have said it better myself" category the book by Kent Beck titled extreme Programming explained ISBN 0-201-61641-6 is a very eloquent discussion of the SIMPL programming philosophy.
• the QNX operating system uses a message passing paradigm similar to SIMPL.  A couple of good books on QNX message passing:  Getting Started with QNX 4 -- A Guide for Realtime Programmers ISBN 0-9682501-0-6 and Getting Started with QNX Neutrino 2 -- A Guide for Realtime Programmers ISBN 0-9682501-1-4

both by Robert Krten

Where has the SIMPL code been used?

• fuel mixing/filling control software
• small format battery data acquisition
• voice over IP telcom application
• security system software
• financial transaction software
• earthquake monitoring

What sort of things are being worked on (or need to be done)?

• Enhance the SIMPL liveCD to include iCanProgram courseware.
• SIMPL on a floppy - in the spirit of the mini Linux boot disk distributions there is a subtask on the SourceForge site which aims to produce a bootable floppy which can do SIMPL things
• Visual Basic with tclSurrogate protocol example
• PHP with tclSurrogate protocol example
• SIMPL XML messaging - there is a subproject on the Sourceforge site which aims to bring Jabber like XML messaging to the SIMPL paradigm.
• uCLinux SIMPL - one of the premier embedded Linux distributions to emerge is uCLinux.    There is a subproject on the Source forge site to help with the ongoing effort to extend SIMPL into the embedded Linux arena
• TCP/IP socket based surrogate infrastructure to allow transparent internet/intranet messaging
• surrogate using RS232/485 serial protocol
• surrogate using UDP protocol
• surrogate using raw ethernet
• surrogate using PEEP protocol
• extensions of Send/Receive/Reply to RTLinux and RTAI realtime processes
• improvements in performance
• installable kernel module
• expansions to benchmark testing suite
• expansions to the example suite
• expansions to the tutorial suite
• create a compelling online "game" using SIMPL
• act as a SIMPL evangelist
• allowance for "senders" to receive control messages while blocked on replies
• support for the Tcl/Tk library
• Python class library for SIMPL
• Python softwareICs
• C++ SIMPL library
• .NET SIMPL interface
• enhanced JAVA SIMPL interface
• generic SIMPL receiver using plugin technology
• alternate GUI toolkits for SIMPL
• Python/Tk
• Qt - SIMPL connectivity
• GTK - SIMPL connectivity
• SIMPL for Micowindows or Tiny X systems
• create a heartbeat softwareIC which incorporates the fcnet example code

Note:

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