Re: [Discuss-gnuradio] Block example that processes on another thread

[Michael Dickens]

On Aug 18, 2007, at 2:57 PM, Eric Blossom wrote:
> On Thu, Aug 16, 2007 at 04:04:40PM -0700, Chris Stankevitz wrote:
> > Can anyone direct me to a block that does its processing on a  
> > separate
> > thread (i.e. other than the thread that calls gr_sync_block::work)

> There aren't any ;)

Not entirely true (just 99% looking at GNU Radio in general)!  gr- 
audio-osx uses multiple threads, with processing done in both the  
scheduler thread as well as the other threads.  Data is transferred  
via buffering, which requires a mutex to lock processing and  
condition to allow for waiting until data is available.  Be  
forewarned, though, that dealing with common data (variables) in  
multiple threads can be difficult!  And tracking down bugs is quite  
difficult, as per my experience yesterday fixing the use of the mutex  
and condition in the OSX modules for audio and USB. - MLD