[LAD] Fw: Re: Deriving a steady MIDI clock crossplatform?

[Jeanette C.]

Thanks both of you. Based on timed_wait, I looked at the boost libraries and 
found two candidates in the Thread library:
conditional_varaible::timed_wait
and
thread::sleep_until
which can both take an absolute time. I suppose both should be equally usable, 
since again absolute time can be calculated independent of the last 
wait/sleep?

Best wishes,

Jeanette

May 19 2022, Fons Adriaensen has written:

> On Thu, May 19, 2022 at 10:40:48PM +0200, Robin Gareus wrote:
> 
>> While there is a corresponding mach/clock.h, for the case at hand it is
>> preferable to use Apple's Core Audio, CoreMIDI. MIDI Event scheduling is
>> abstracted, and there is dedicated API to convert timestamped events
>> with high precision:
>> 
>> AudioConvertNanosToHostTime() and AudioConvertHostTimeToNanos()
>
> The problem here is not conversion, but what to wait for,
>
> In zita-convolver.h there is an implementation of sem_t for OSX
> (which only has a crippled implementation), using a condition
> variable. It doesn't have sem_timedwait(), (since zita-convolver
> doesn't need it) but that could be added quite easily.
>
> Ciao,
>
> -- 
> FA
>
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