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RE: Last version of message queues.
- To: 'Ross Johnson' <rpj at ise dot canberra dot edu dot au>, 'Le Coent Yannick' <Yannick dot LeCoent at srit dot siemens dot fr>, pthreads-win32 at sourceware dot cygnus dot com
- Subject: RE: Last version of message queues.
- From: Aurelio Medina <AMedina at xcaliber dot com>
- Date: Fri, 3 Aug 2001 08:19:01 -0500
Ross,
I am using the 2000-12-29 snapshot. Do you return an error in newer
snapshots. If so, let me know and I can update the code.
Aurelio
-----Original Message-----
From: Ross Johnson [mailto:rpj@ise.canberra.edu.au]
Sent: Thursday, August 02, 2001 11:49 PM
To: Aurelio Medina; 'Le Coent Yannick';
pthreads-win32@sourceware.cygnus.com
Subject: Re: Last version of message queues.
Aurelio,
Ross Johnson wrote:
>
> Hi Aurelio,
>
> Last time I looked you needed PTHREAD_PROCESS_SHARED mutexes
> and condition variables. The code you just sent does the same
> as last time.
>
> _POSIX_THREAD_PROCESS_SHARED isn't defined in pthreads-win32, nor
> in Linux I believe (although I could be out of date there).
>
> For example, in mq_open() you have the following code:
>
> if ( (i = pthread_mutexattr_init(&mattr)) != 0)
> goto pthreaderr;
> pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED);
> i = pthread_mutex_init(&mqhdr->mqh_lock, &mattr);
> pthread_mutexattr_destroy(&mattr); /* be sure to destroy */
> if (i != 0)
> goto pthreaderr;
>
> if ( (i = pthread_condattr_init(&cattr)) != 0)
> goto pthreaderr;
> pthread_condattr_setpshared(&cattr, PTHREAD_PROCESS_SHARED);
> i = pthread_cond_init(&mqhdr->mqh_wait, &cattr);
>
> The *attr_setpshared() calls will be returning ENOSYS errors.
>
I apologise - it's pthread_{mutex,cond}_init() that should be
returning ENOSYS, not *attr_setpshared(). Since you're catching
that I'm now confused so I'll go take a longer harder look.
Sorry.
Ross