Re: Re: dmix plugin

[Jaroslaw Sobierski <fycio@gucio.com>]

>> I see, the read/saturate/write must be atomic, too. In this case, it would
>> be better to use a global (or a set of) mutex(es) to lock the hardware
>> ring buffer. The futexes are nice.
>
>They are nice indeed, but definitely not the right solution here.
>
>Although I don't know if it's the absolute best solution, the 'retry'
>approach I've proposed is far better and much more efficient.

I have to agree with Abramo. A global mutex would cause long and unnecessary 
waits for the processes trying to write to the plugin. Locking access to
individual parts of the buffer is messy. Notice that concurrent writes 
to the same sample in the buffer will occur sporadically, and the "re-read"
in the loop costs almost nothing, while synchronization mechanisms could 
block often.

--------------
Fycio (J.Sobierski)
 fycio@gucio.com


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