On Mon, 17 Feb 2003, Abramo Bagnara wrote:
> You're wrong: xadd is atomic but xadd/read/saturation/write is not.
>
> Without the loop I've added you risk to write on hw_ring_buffer an *old*
> value:
>
> A: B:
> xadd
> read
> xadd
> read
> saturate
> write
> saturate
> write
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.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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