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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: Ian Kemmish <email@hidden>
  • Date: Wed, 08 Jan 2014 07:38:57 +0000

On 7 Jan 2014, at 17:44:37 -0800, Lucas Ives <email@hidden> wrote:
> I could pass data through a lock-free pipe back to another thread and
> poll its existence, but my blocks have the property that they both need
> to fire as soon as possible and also are used (relatively)
> infrequently... so it seems like a waste to be constantly polling for
> them using NSTimer or the like.


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....


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Ian Kemmish                     18 Durham Close, Biggleswade, Beds SG18 8HZ
email@hidden        Tel: +44 1767 601361     Mob: +44 7952 854387
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