Re: [ts-7000] RTAI shared memory

The way I understand it, shared memory
has not been historically built into the arm implementation of RTAI.  Why...
I don't really know.  I seem to recall some talk about this on the
RTAI message list and some guys had 2.6 kernel RTAI kernel patches although
I've never pursued it.

I've just been using the RAM disks to
communicate between RTAI and linux processes.  The code is the same
for either side:

// Declarations
int        
       iord = -1 ;
struct S_IPC        *psIPC
= 0 ;        // S_IPC can be anything, of course

// Open memory and set struct pointer
iord = open( "/dev/rd/0",
O_RDWR ) ;
if( iord == -1 ) {
        printf(
"*ERROR*, quitting \n" ) ;
        return 0
;
}
psIPC = mmap( 0, sizeof(struct S_IPC),
PROT_READ|PROT_WRITE, MAP_SHARED, iord, 0 ) ;
if( psIPC == (struct S_IPC *)-1 ) {
        printf(
"*ERROR*, quitting \n" ) ;
        return 0
;
}

// When complete you just:
close( iord ) ;
psIPC  = 0 ;

 wrote on 01/13/2007 12:35:29
PM:

> Hi,
> 
> I'm trying to run a RTAI application on TS7300
> 
> I noticed that Shared Memory Support for RTAI is not enabled in
> default config files. And pre compiled tarball doesn't contain these
> modules either.
> (I look at these files rtai-3.2-magma-compiled.tar.gz and
> rtai-3.2-magma-src.tar.gz)
> 
> I also can't enable it using xconfig too. In IPC section, there is
no
> Shared Memory item.
> 
> Is there any one who knows how to enable it? 
> Or Is there a problem with ARM porting of shared memory routines?
So
> should I just avoid using it?
> 
> Best regards,
> Oguz.
> 
> 
> 
>  
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