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RE: POSIX Message Queues for Win32!


John,

Those are good points and I pretty much agree.  My only recommendation is
that it stays associated with the PThreads-Win32 library since it is a
dependency.  If a new project is created who will maintain it?

Aurelio

> -----Original Message-----
> From:	Bossom, John [SMTP:John.Bossom@Cognos.COM]
> Sent:	Friday, October 13, 2000 10:08 AM
> To:	Medina, Aurelio; rpj@ise.canberra.edu.au
> Cc:	jramirez@tct.hut.fi; pthreads-win32@sourceware.cygnus.com
> Subject:	RE: POSIX Message Queues for Win32!
> 
> First of all, I think it is great that you are contributing
> this MQ code to open source.
> 
> As I have pointed out to Ross, however, I don't believe that the
> MQ source should be integrated into the pthreads-win32 library.
> Instead, I believe it should be it's own library that requires the
> pthreads-win32.
> 
> I have two reasons for this:
> 
> 1) MQs are not part of PThreads. The PThreads-win32 project was
>    to provide an implementation of POSIX-1003.1c-1995 (i.e. POSIX.4a)
>    with the addition of semaphores, from POSIX 1003.1b-1993.
>    MQs are part of POSIX.4
>    Adding MQ's to pthreads-win32 will basically permut the project
>    into a repository for all POSIX.4 features; thus it will no
>    longer be focused on PThreads, specifically.
>       
> 2) It prevents users from picking and choosing what components
>    they wish/need. A PThreads client may not want MQ's.
>    Even on Solaris, the message queues are part of the posix4 library
>    while the pthreads library is separate.
>    i.e. to link against both PThreads and MQ's on Solaris, you would
>         have to specify
>                   -lposix4 -lpthread
> 
> My recommendation is to start a new project that provides MQ's
> 
> John
> 
> -----Original Message-----
> From: aurelio.medina@bankofamerica.com
> [mailto:aurelio.medina@bankofamerica.com]
> Sent: Friday, October 13, 2000 10:19 AM
> To: rpj@ise.canberra.edu.au
> Cc: jramirez@tct.hut.fi; pthreads-win32@sourceware.cygnus.com
> Subject: POSIX Message Queues for Win32!
> 
> 
> All,
> 
> Since I never actually tested my Win32 port of POSIX Message Queues I had
> no
> idea how close I actually was.  Much to my surprise, I am glad to announce
> that the source code provided below is now indeed very functional.  I have
> tested this code with the file 'tester.c' using of course the
> PThreads-Win32
> library and it worked great.
> 
> I'd like to provide a little history and notes about this source code.
> 
> 1) I used Richard Steven's (May he RIP) POSIX MQ implementation using UNIX
> memory mapped I/O as the base source code.
> 2) I then had to make a few very minor changes to port it to HP-UX 10.x.
> 3) I used this code in an in-house UNIX application at work that heavily
> tested this code and it never once broke.
> 4) Thinking I would also need to port this application to Windows NT I
> ported the POSIX MQ library to Win32 using Win32 memory mapped I/O.  Since
> I
> never did port my application to Windows NT I never got to test my ported
> code.
> 5) Finally I decided to see just how close I was to having functional
> code.
> In my opinion this code is about 90% functional and can be made available
> as
> is.  See "Things left to be done" below.
> 6) This code can be used on Win32 as well as UNIX platforms.
> 7) This code was compiled using MS Visual C++ 6.0.
> 
> POSIX Message Queue functions implemented:
> mq_open()
> mq_close()
> mq_unlink()
> mq_getattr()
> mq_setattr()
> mq_receive()
> mq_send()
> 
> Thing left to be done:
> 1) Integrate into the current PThread-Win32 library.
> 2) Implement mq_notify(), this could be tough.  Anyone up for the
> challenge?
> 3) Provide more test cases.
> 4) Build using other compilers?
> 
> Finally, given the fact that most of this MQ source code has been heavily
> tested by my in-house application on UNIX, I am fairly confident that the
> Win32 port should be stable.  But please do test some more.
> 
>  <<mqueue.h>>  <<mqueue.c>>  <<tester.c>> 
> 
> Aurelio Medina
> 
> 
> > -----Original Message-----
> > From:	Ross Johnson [SMTP:rpj@ise.canberra.edu.au]
> > Sent:	Wednesday, October 11, 2000 6:55 PM
> > To:	Medina, Aurelio
> > Cc:	jramirez@tct.hut.fi; pthreads-win32@sourceware.cygnus.com
> > Subject:	Re: Message queues
> > 
> > Hi,
> > 
> > I'm going to make a special note to myself to include Aurelio's
> > starting code in the next snapshot, which is what I should have done
> > already - sorry. And I'll try to get it out as soon as I can - say,
> > by next monday.
> > 
> > Ross
> > 
> > aurelio.medina@bankofamerica.com wrote:
> > > 
> > > Julio,
> > > 
> > > At one point I sent in my draft code implementing POSIX Message Queues
> > for
> > > Win32 hoping that someone can complete it.  I may be able to finish it
> > in a
> > > month or two but my work schedule makes it tough to do.
> > > 
> > > Has anyone touched the source code that I sent to the PThreads-Win32
> > mailing
> > > list.  If there is enough interest in POSIX MQs for Win32 I may try to
> > > complete it.  I have benefitted from this effort and  I might be able
> to
> > > contribute more if there is enough interest.
> > > 
> > > Aurelio Medina
> > > 
> > > > -----Original Message-----
> > > > From: Julio [SMTP:jramirez@tct.hut.fi]
> > > > Sent: Wednesday, October 11, 2000 5:29 AM
> > > > To:   'Pthreads-win32'
> > > > Subject:      Message queues
> > > >
> > > > Sorry, this may be offtopic.
> > > >
> > > > Could someone tell me where can I find Win32 POSIX libraries for
> > message
> > > >
> > > > queues??
> > > >
> > > > Thnx.

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