Subject: Re: [linux-audio-dev] Plugin APIs (again)
From: Paul Davis (paul_AT_linuxaudiosystems.com)
Date: Tue Dec 10 2002 - 16:28:26 EET
>Steve Harris wrote:
>
>>On Tue, Dec 10, 2002 at 02:03:42 +0100, Tim Goetze wrote:
>>> >Not if it generates machine code. That way, it could (theoretically)
>>>
>>> in realtime? we'll need everybodies' spare cpu cycles!
>>
>>No, it really isn't that slow.
>>
>>SyncModular does a similar trick.
>
>it'd still be interesting to know how the sync problems this
>method poses are solved: you cannot rely on executable code
>modifications to be atomic. an indirect jump instruction is
>not guaranteed to work ok: a pointer on x86 is 32 bits, and
>atomic is 24 bits
no, atomic is 32 bits on x86. its only 24 bits on sparc, where
the need to provide a spinlock to cover cache write-back effects
forces it to 24 bits. you can do atomic exchange and compare-and-swap
on pointers for x86.
--p
This archive was generated by hypermail 2b28 : Tue Dec 10 2002 - 16:26:14 EET