[LAD] Atomic Operations

[Tim Blechmann]

> +#if defined(__APPLE__)
> +#include <libkern/OSAtomic.h>
> +#define MEMORY_BARRIER() OSMemoryBarrier()
> +#elif (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
> +#define MEMORY_BARRIER() __sync_synchronize()
> +#else
> +#warning SMP Danger: memory barriers are not supported on this system
> +#endif

there was a buggy gcc version, that didn't implement
__sync_synchronize() correctly on x86, causing errors on nehalem
machines (which don't have a shared cache).

if sse is enabled, _mm_mfence() can be used to work around this compiler
bug ...

tim

-- 
tim at klingt.org
http://tim.klingt.org

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