Re: [Xenomai-help] uClinux write to pipe returning -ENOMEM

[Philippe Gerum <rpm@xenomai.org>]

Filip Van Rillaer wrote:
> Hello,
> 
> Thank you for your work-around.
> Though I have some problems with the implementation:
> pipe_i_handler (Xenomai side) does not know when the xnpipe_write got
> errno=ENOMEM (the pipe_i_handler is I think even not called in case
> ENOMEM is returned).  So there is I think with the current Xenomai
> implementation no way for the pipe_i_handler to correctly fill in the
> value of buffer_filled_up_p.  This would mean that my writer-thread
> 'userland' would have to set this 'variable'.
> Then I was thinking about moving the <<rt_sem_p(&bsync, TM_INFINITE)>>
> to the writer-thread when errno-ENOMEM is returned, but that would
> require that the writer-thread has to bind the semaphore that was
> created in another program.  This is probably possible via the Xenomai
> registry.
> 

Commit #4114 provides P_EVENT_NOBUF (formerly P_EVENT_FULL).

-- 
Philippe.