Re: cmpxchgl on x86?
Re: cmpxchgl on x86?
- Subject: Re: cmpxchgl on x86?
- From: Shantonu Sen <email@hidden>
- Date: Fri, 24 Jun 2005 08:18:35 -0700
On Jun 24, 2005, at 7:52 AM, David Leimbach wrote:
On 24 jun 2005, at 16:40, David Leimbach wrote:
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 :).
libSystem = libc
Note he wants me to use libkern. Which is it? :)
Both. These functions are implemented in libSystem.
[ssen@ssen]$ nm -g /usr/lib/libSystem.B.dylib | grep OSAtomicCompareAndSwap32 900ecbe8 T _OSAtomicCompareAndSwap32 900ecbe8 T _OSAtomicCompareAndSwap32Barrier U _OSAtomicCompareAndSwap32 U _OSAtomicCompareAndSwap32Barrier
Shantonu |
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