Re: cmpxchgl on x86?
Re: cmpxchgl on x86?
- Subject: Re: cmpxchgl on x86?
- From: David Leimbach <email@hidden>
- Date: Fri, 24 Jun 2005 07:40:00 -0700
> Also, there are compare-and-swap routines already in libSystem:
>
> <libkern/OSAtomic.h>
>
> /* Compare and swap. They return true if the swap occured.
> */
> bool OSAtomicCompareAndSwap32( int32_t oldValue, int32_t newValue,
> int32_t *theValue );
> bool OSAtomicCompareAndSwap32Barrier( int32_t oldValue, int32_t
> newValue, int32_t *theValue );
>
Seems a shame to have to include an entire other framework just for a
single assembly instruction :). It'd be really cool if apple had a
lighter weight wrapper around such lock code :).
Looking at atomic.s from xnu is what I usually do to find out what I
need to hand-code so I can avoid that extra dependency and write more
maintainable, and portable code.
Dave
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