[linux-audio-dev] deblocking snd_seq_event_input()

Fons Adriaensen fons.adriaensen at skynet.be
Fri May 6 12:07:00 UTC 2005

On Fri, May 06, 2005 at 09:36:23AM +0200, Clemens Ladisch wrote:

> > Is there a simple (i.e. simpler than getting the pollfd and using them)
> > to force snd_seq_event_input() in blocking mode to return, so the the
> > calling thread can close the handle and cleanup ?
> You could try to send this thread a signal, but I don't know how well
> signals and threads work together.
> Otherwise, if you want to wait for an event other than "sequencer
> event received", you must use poll.

I see. Still I find this strange. Shouldn't a call that waits on fd
return with an error code when that fd is closed ? If it doesn't, what
is supposed to happen to the calling thread ? Could it still wake up
if the fd is re-used afterwards ? 

Since snd_seq_event_input() probably uses poll() internally, why 
doesn't it test for POLLERR,-HUP,-NVAL ?


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