Subject: Re: [linux-audio-dev] lock-free ring buffer code
From: Paul Davis (paul_AT_linuxaudiosystems.com)
Date: Tue Apr 08 2003 - 13:52:10 EDT
>> The glibc has internal support for atomic operations (at least
>> atomic_add() is there and allows a negative argument, so
>> atomic_sub() is there too and exchange_and_add(&lff->filled, 0)
>> will provide an atomic read), so there is no problem about
>> portability on Linux systems (and even other systems).
>
>You should probably special case architectures where 32bit read/write is
>atomic, as its a common case at the moment.
the kernel code for atomic_t does this already. atomic_inc(atomic_t* a)
resolves to a++ or something like that.
--p
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