On Tue, Jul 13, 2004 at 10:21:23 -0700, Joshua Haberman wrote: > >Its not my experieince that you usually need to allocate memory in RT > >threads, the times when I've seen it done are mostly <generalisation> > >bacuase of bad design, excessive OO-ness or lack of knowledge of > >alloca(3) </generalisation>. > > One reason I can think of is that you want to be sure to never, ever > drop a captured buffer when you are recording. You need buffers to send > the captured audio data to a disk thread, but without being able to call > malloc() from the audio thread, you have to pre-allocate a fixed amount > of memory for this purpose. No guess is high enough to guarantee that > you will never drop buffers, and the more you allocate in advance the > higher your overhead.
Thats true, but that problem (running out of disk buffer) only happens in extreme conditions, soft RT systems fail under lots of extreme conditions awyway. - Steve
