Re: [Xenomai-help] Some problems with shared memory

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

roderik.wildenburg@domain.hid wrote:
> I have two problems with shared memory and Xenomai 2.4.6 (2.4.25 PPC-kernel):
> 
> 1.) If I don´t page align the size of shared memory (multiple of 4096) I get the following error message :
> "createshm mmap: No such device or address"
> 
> Detailed programm output of attached testprogram :
> {
> prompt # ./killtest -c &
> [1] 104
> prompt # createshm mmap: No such device or address
> shmsize = 100000; errno : 6 == Failed to create shm : -3
> killtest user exit !
> }
> 
> You can reproduce this effect by commenting out line 60 in the attached source file and calling the program as follows:
> 
> prompt # killtest -c
> 
> 
> 2.) If I create 2 processes which use the same shared memory and I kill the process which created the SHM before (!) the other process, which only uses the SHM, the whole system stalls.
> You can reproduce this with the attached testprogramm by calling it in the following way :
> 
> prompt # ./killtest -c &
> [1] 105
> prompt # ./killtest &
> [2] 106
> prompt # kill 105
> prompt # killtest user exit !
> [1]-  Done                    ./killtest -c
> prompt # kill 106
> 
> System stalls    
> 
> 
> Is this a problem of Xenomai (Cleanup od SHM) or am I creating/deleting the SHM in a wrong way ?
> Could you please try to reproduce this problem ?

Could you try to reproduce these issues with xenomai 2.4.7 and the patch
posted here:
https://mail.gna.org/public/xenomai-help/2009-03/msg00098.html

-- 
                                                 Gilles.