RE: posix msg queues

RE: posix msg queues

[Rotem Shacham]

Hi,
Can you please give me a lead as to were can I find some info on Posix MQ ?

10x
Rotem.

-----Original Message-----
From: pthreads-win32-owner@sources.redhat.com
[ mailto:pthreads-win32-owner@sources.redhat.com]On Behalf Of Aurelio Medina
Sent: Tuesday, August 07, 2001 4:27 PM
To: 'Phil Crescioli'
Cc: 'pthreads-win32@sourceware.cygnus.com'
Subject: RE: posix msg queues


Phil,

As Ross J. pointed out earlier the PTHREAD_PROCESS_SHARED attribute is not
yet available.  What this means for the POSIX MQ code that I provided is
that it is not safe to use on Win32 if you have more than one process using
the same MQ.  It is still safe on other systems that support this attribute
but do not have a MQ library available.

NOTE: I use POSIX MQ in my Win32 apps to queue data between two threads in
the same process.  It is safe to use in this fashion.  Hopefully the
PTHREAD_PROCESS_SHARED attribute will become available later.

Aurelio

-----Original Message-----
From: Phil Crescioli [ mailto:pcrescio@dsrnet.com ]
Sent: Tuesday, August 07, 2001 7:19 AM
To: Aurelio Medina
Cc: 'pthreads-win32@sourceware.cygnus.com'
Subject: posix msg queues


Aurelio,

Got your posix tester code working on solaris2.7, hpux11.0, and windoze
2000.
Thanks for making the posix port to win32 painless!  Actually I modified the
tester.c
code to send a data structure with the message buffer as one of the fields
in the
structure, as my project requires, and every msg receive I go through a
sequence
checking algorithm to make sure I dont drop data, etc...

I'm now breaking this modified tester.c into two processes where one is a
sender
and the other a receiver.  All compiles and runs, but the receiver never
gets the data.
Im looking at mq_open on Solaris and trying to undertsand what might be the
reason
why the reciever process never gets the data from the sender process?

Any ideas?  Know of any tutorials on posix ipc out?

Thanks,
Phil


=======================================
=======================================
Phil Crescioli
Software Engineer
Digital System Resources    Innovative solutions
(o)703-263-7405                  for today's systems
(c)703-408-5198                     and tomorrows
pcrescioli@dsrnet.com             applications..
http://www.dsrnet.com
=======================================
                             Resume
http://users.erols.com/madisons/resume/resume.html
=======================================

Re: posix msg queues

[Scott McCaskill]

try doing a search for "posix message queue" on google

----- Original Message -----
From: "Rotem Shacham" <rotem.shacham@bluesoft-inc.com>
To: "Posix Mailing list" <pthreads-win32@sourceware.cygnus.com>
Sent: Tuesday, August 07, 2001 11:17 AM
Subject: RE: posix msg queues


> Hi,
> Can you please give me a lead as to were can I find some info on Posix MQ
?
>
> 10x
> Rotem.
>
> -----Original Message-----
> From: pthreads-win32-owner@sources.redhat.com
> [ mailto:pthreads-win32-owner@sources.redhat.com]On Behalf Of Aurelio
Medina
> Sent: Tuesday, August 07, 2001 4:27 PM
> To: 'Phil Crescioli'
> Cc: 'pthreads-win32@sourceware.cygnus.com'
> Subject: RE: posix msg queues
>
>
> Phil,
>
> As Ross J. pointed out earlier the PTHREAD_PROCESS_SHARED attribute is not
> yet available.  What this means for the POSIX MQ code that I provided is
> that it is not safe to use on Win32 if you have more than one process
using
> the same MQ.  It is still safe on other systems that support this
attribute
> but do not have a MQ library available.
>
> NOTE: I use POSIX MQ in my Win32 apps to queue data between two threads in
> the same process.  It is safe to use in this fashion.  Hopefully the
> PTHREAD_PROCESS_SHARED attribute will become available later.
>
> Aurelio
>
> -----Original Message-----
> From: Phil Crescioli [ mailto:pcrescio@dsrnet.com ]
> Sent: Tuesday, August 07, 2001 7:19 AM
> To: Aurelio Medina
> Cc: 'pthreads-win32@sourceware.cygnus.com'
> Subject: posix msg queues
>
>
> Aurelio,
>
> Got your posix tester code working on solaris2.7, hpux11.0, and windoze
> 2000.
> Thanks for making the posix port to win32 painless!  Actually I modified
the
> tester.c
> code to send a data structure with the message buffer as one of the fields
> in the
> structure, as my project requires, and every msg receive I go through a
> sequence
> checking algorithm to make sure I dont drop data, etc...
>
> I'm now breaking this modified tester.c into two processes where one is a
> sender
> and the other a receiver.  All compiles and runs, but the receiver never
> gets the data.
> Im looking at mq_open on Solaris and trying to undertsand what might be
the
> reason
> why the reciever process never gets the data from the sender process?
>
> Any ideas?  Know of any tutorials on posix ipc out?
>
> Thanks,
> Phil
>
>
> =======================================
> =======================================
> Phil Crescioli
> Software Engineer
> Digital System Resources    Innovative solutions
> (o)703-263-7405                  for today's systems
> (c)703-408-5198                     and tomorrows
> pcrescioli@dsrnet.com             applications..
> http://www.dsrnet.com
> =======================================
>                              Resume
> http://users.erols.com/madisons/resume/resume.html
> =======================================
>
>

RE: posix msg queues

[Aurelio Medina]

Phil,

As Ross J. pointed out earlier the PTHREAD_PROCESS_SHARED attribute is not
yet available.  What this means for the POSIX MQ code that I provided is
that it is not safe to use on Win32 if you have more than one process using
the same MQ.  It is still safe on other systems that support this attribute
but do not have a MQ library available.

NOTE: I use POSIX MQ in my Win32 apps to queue data between two threads in
the same process.  It is safe to use in this fashion.  Hopefully the
PTHREAD_PROCESS_SHARED attribute will become available later.

Aurelio

-----Original Message-----
From: Phil Crescioli [ mailto:pcrescio@dsrnet.com ]
Sent: Tuesday, August 07, 2001 7:19 AM
To: Aurelio Medina
Cc: 'pthreads-win32@sourceware.cygnus.com'
Subject: posix msg queues


Aurelio,

Got your posix tester code working on solaris2.7, hpux11.0, and windoze
2000.
Thanks for making the posix port to win32 painless!  Actually I modified the
tester.c
code to send a data structure with the message buffer as one of the fields
in the 
structure, as my project requires, and every msg receive I go through a
sequence 
checking algorithm to make sure I dont drop data, etc...

I'm now breaking this modified tester.c into two processes where one is a
sender
and the other a receiver.  All compiles and runs, but the receiver never
gets the data.
Im looking at mq_open on Solaris and trying to undertsand what might be the
reason 
why the reciever process never gets the data from the sender process?

Any ideas?  Know of any tutorials on posix ipc out?

Thanks,
Phil


=======================================
=======================================
Phil Crescioli
Software Engineer
Digital System Resources    Innovative solutions
(o)703-263-7405                  for today's systems
(c)703-408-5198                     and tomorrows
pcrescioli@dsrnet.com             applications..
http://www.dsrnet.com                                                     
=======================================
                             Resume
http://users.erols.com/madisons/resume/resume.html
=======================================

posix msg queues

[Phil Crescioli]

Aurelio,

Got your posix tester code working on solaris2.7, hpux11.0, and windoze 2000.
Thanks for making the posix port to win32 painless!  Actually I modified the tester.c
code to send a data structure with the message buffer as one of the fields in the 
structure, as my project requires, and every msg receive I go through a sequence 
checking algorithm to make sure I dont drop data, etc...

I'm now breaking this modified tester.c into two processes where one is a sender
and the other a receiver.  All compiles and runs, but the receiver never gets the data.
Im looking at mq_open on Solaris and trying to undertsand what might be the reason 
why the reciever process never gets the data from the sender process?

Any ideas?  Know of any tutorials on posix ipc out?

Thanks,
Phil


=======================================
=======================================
Phil Crescioli
Software Engineer
Digital System Resources    Innovative solutions
(o)703-263-7405                  for today's systems
(c)703-408-5198                     and tomorrows
pcrescioli@dsrnet.com             applications..
http://www.dsrnet.com                                                     
=======================================
                             Resume
http://users.erols.com/madisons/resume/resume.html
=======================================