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Re: scheduling a block from a render callback
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Re: scheduling a block from a render callback

  • Subject: Re: scheduling a block from a render callback
  • From: Paul Davis <email@hidden>
  • Date: Wed, 08 Jan 2014 09:23:16 -0500



On Wed, Jan 8, 2014 at 2:38 AM, Ian Kemmish <email@hidden> wrote:

Being an old codger, I occasionally find myself saying things like that - until I remember that these days, I'm very unlikely to end up running code on a single-CPU machine :-)  Polling isn't as wasteful as it used to be.

If you are polling, then a single byte variable accessible to both threads is even simpler than a fifo, of course.

My synth needs the real-time thread to co-ordinate with a memory allocator running in a separate thread, which is also "urgent" and "relatively infrequent".  I use the macros in libkern/OSAtomic.h, which seem to be the lowest-overhead synchronisation primitives.  I can't remember offhand which of those are non-blocking, but there's documentation somewhere....

none of those will serve to actually wake another thread, however. so if you use them, you have to ensure that the other thread is waking regularly via some other mechanism and checking whether it has work to do. which approach  works best depends on the precise situation.
 
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 >Re: scheduling a block from a render callback (From: Ian Kemmish <email@hidden>)

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