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atomic.h: added atomicMaximum() helper function

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Wenzel Jakob 2013-12-19 18:51:23 +01:00
parent a5c13d4469
commit 4bae47db4c
1 changed files with 39 additions and 0 deletions
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39
include/mitsuba/core/atomic.h
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@ -189,6 +189,45 @@ inline int64_t atomicAdd(volatile int64_t *dst, int64_t delta) {
#endif
}
/**
* \brief Atomically set \c dst to the maximum of itself and \c value
* \return The maximum value now stored in \c dst
*/
inline int64_t atomicMaximum(volatile int64_t *dst, int64_t value) {
int64_t current;
do {
current = *dst;
if (value <= current)
return current;
#if (defined(__i386__) || defined(__amd64__))
__asm__ __volatile__ ("pause\n");
#endif
} while (!atomicCompareAndExchange(dst, value, current));
return value;
}
/*
* \brief Atomically set \c dst to the maximum of itself and \c value
* \return The maximum value now stored in \c dst
*/
inline int32_t atomicMaximum(volatile int32_t *dst, int32_t value) {
int32_t current;
do {
current = *dst;
if (value <= current)
return current;
#if (defined(__i386__) || defined(__amd32__))
__asm__ __volatile__ ("pause\n");
#endif
} while (!atomicCompareAndExchange(dst, value, current));
return value;
}
/*! }@ */
MTS_NAMESPACE_END