Re: clocks
Re: clocks
- Subject: Re: clocks
- From: Sam Aaron <email@hidden>
- Date: Mon, 17 Nov 2008 21:10:16 +0100
Hi Jeff,
thank you very much for your descriptive email.
The algorithm you specify was in fact the first approach I took.
However the cumulative effect of what you describe as the scheduling
latency and the high latency of JRuby's message passing (which was
generating and sending MIDI packets) made me believe that there was a
better approach, and perhaps even something already available I could
just pick up and run with.
(I had recently assumed that Core Audio Clock might have been that
very thing which led me to this list)
However, from what I understand of what you were describing, all I
need to do is to drop down to a C thread and use more accurate system
calls. I have heard of mach_absolute_time, however, I don't have much
experience in C thread scheduling. In particular I'm not aware of what
you describe as the 'time constraint policy the scheduler provides' an
understanding of which you say is necessary to ensure as little
scheduling latency as possible occurs. Do you by any chance have any
pointers to documentation/examples of this. In a similar vein perhaps
you might also be so kind as to point me to documentation/examples of
pthread_cond_timedwait_relative_np().
Thanks once again,
Sam Aaron
---
http://sam.aaron.name
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| References: | |
| | >clocks (From: Sam Aaron <email@hidden>) |
| | >Re: clocks (From: Jeff Moore <email@hidden>) |