[linux-dvb] Re: More V4 Video API Q's

[Holger Waechtler <holger@qanu.de>]

Holger Waechtler wrote:

> Have you tried to send a signal to the blocking thread? This can in 
> any case get catched & processed in the ioctl handler.

after a little more thinking I believe that the following would be the 
correct implementation:

* open()
* start decoder threads
(... wait for stop command from GUI...)
* send stop signal to threads
* call pthread_cancel()
* pthread_join()
* close().

Since blocking read/write and ioctl calls are defined by POSIX as 
cancellation points this should work just fine without any extra support 
in the API. After passing non-cancellation points the decoder threads 
should call pthread_testcancel().

Holger