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a few more atomic operations

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Wenzel Jakob 2011-02-16 13:46:52 +01:00
parent 16f2454388
commit 9ded600b45
1 changed files with 44 additions and 6 deletions
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50
include/mitsuba/core/atomic.h
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@ -72,7 +72,12 @@ inline bool atomicCompareAndExchange(volatile int64_t *v, int64_t newValue, int6
#endif
}
inline float atomicAdd(volatile float *val, float delta) {
/**
* \brief Atomically add \a delta to the floating point destination \a dst
*
* \return The final value written to \a dst
*/
inline float atomicAdd(volatile float *dst, float delta) {
/* Atomic FP addition from PBRT */
union bits { float f; int32_t i; };
bits oldVal, newVal;
@ -82,13 +87,18 @@ inline float atomicAdd(volatile float *val, float delta) {
#if (defined(__i386__) || defined(__amd64__))
__asm__ __volatile__ ("pause\n");
#endif
oldVal.f = *val;
oldVal.f = *dst;
newVal.f = oldVal.f + delta;
} while (!atomicCompareAndExchange((volatile int32_t *) val, newVal.i, oldVal.i));
} while (!atomicCompareAndExchange((volatile int32_t *) dst, newVal.i, oldVal.i));
return newVal.f;
}
inline double atomicAdd(volatile double *val, double delta) {
/**
* \brief Atomically add \a delta to the floating point destination \a dst
*
* \return The final value written to \a dst
*/
inline double atomicAdd(volatile double *dst, double delta) {
/* Atomic FP addition from PBRT */
union bits { double f; int64_t i; };
bits oldVal, newVal;
@ -98,12 +108,40 @@ inline double atomicAdd(volatile double *val, double delta) {
#if (defined(__i386__) || defined(__amd64__))
__asm__ __volatile__ ("pause\n");
#endif
oldVal.f = *val;
oldVal.f = *dst;
newVal.f = oldVal.f + delta;
} while (!atomicCompareAndExchange((volatile int64_t *) val, newVal.i, oldVal.i));
} while (!atomicCompareAndExchange((volatile int64_t *) dst, newVal.i, oldVal.i));
return newVal.f;
}
/**
* \brief Atomically add \a delta to the 32-bit integer destination \a dst
*
* \return The final value written to \a dst
*/
inline int32_t atomicAdd(volatile int32_t *dst, int32_t delta) {
#if defined(WIN32)
return InterlockedAdd(dst, delta);
#else
return __sync_add_and_fetch(dst, delta);
#endif
}
/**
* \brief Atomically add \a delta to the 64-bit integer destination \a dst
*
* \return The final value written to \a dst
*/
inline int32_t atomicAdd(volatile int64_t *dst, int64_t delta) {
#if defined(WIN32)
return _InterlockedAdd64(dst, delta);
#else
return __sync_add_and_fetch(dst, delta);
#endif
}
MTS_NAMESPACE_END
#endif /* __ATOMIC_H */