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/* util.h */
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#ifndef UTIL_H
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#define UTIL_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if (defined(__GNUC__) && __GNUC__ >= 4 && (__GNUC__ > 4 || __GNUC_MINOR__ >= 1) \
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&& defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)) \
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|| (defined(__INTEL_COMPILER) && !defined(_WIN32))
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/* atomic operations are defined by ICC and GCC >= 4.1, but by the later one supposedly not for ARM */
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/* note: ICC on ia64 platform possibly require ia64intrin.h, need testing */
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# define atomic_compare_and_swap(ptr, oldval, newval) __sync_val_compare_and_swap(ptr, oldval, newval)
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#elif defined(_MSC_VER)
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# include <windows.h>
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# define atomic_compare_and_swap(ptr, oldval, newval) InterlockedCompareExchange(ptr, newval, oldval)
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#elif defined(__sun)
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# include <atomic.h>
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# define atomic_compare_and_swap(ptr, oldval, newval) atomic_cas_32(ptr, oldval, newval)
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#else
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/* pray that it will work */
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# define atomic_compare_and_swap(ptr, oldval, newval) { if (*(ptr) == (oldval)) *(ptr) = (newval); }
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# define NO_ATOMIC_BUILTINS
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#endif
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#ifdef __cplusplus
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} /* extern "C" */
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#endif /* __cplusplus */
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#endif /* UTIL_H */
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