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Release tag: https://github.com/HdrHistogram/HdrHistogram_c/releases/tag/0.11.2 Fixes: #39450 PR-URL: #39462 Reviewed-By: Tobias Nießen <tniessen@tnie.de> Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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/** | ||
* hdr_atomic.h | ||
* Written by Philip Orwig and released to the public domain, | ||
* as explained at http://creativecommons.org/publicdomain/zero/1.0/ | ||
*/ | ||
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#ifndef HDR_ATOMIC_H__ | ||
#define HDR_ATOMIC_H__ | ||
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#if defined(_MSC_VER) | ||
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#include <stdint.h> | ||
#include <intrin.h> | ||
#include <stdbool.h> | ||
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static void __inline * hdr_atomic_load_pointer(void** pointer) | ||
{ | ||
_ReadBarrier(); | ||
return *pointer; | ||
} | ||
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static void hdr_atomic_store_pointer(void** pointer, void* value) | ||
{ | ||
_WriteBarrier(); | ||
*pointer = value; | ||
} | ||
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static int64_t __inline hdr_atomic_load_64(int64_t* field) | ||
{ | ||
_ReadBarrier(); | ||
return *field; | ||
} | ||
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static void __inline hdr_atomic_store_64(int64_t* field, int64_t value) | ||
{ | ||
_WriteBarrier(); | ||
*field = value; | ||
} | ||
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static int64_t __inline hdr_atomic_exchange_64(volatile int64_t* field, int64_t value) | ||
{ | ||
#if defined(_WIN64) | ||
return _InterlockedExchange64(field, value); | ||
#else | ||
int64_t comparand; | ||
int64_t initial_value = *field; | ||
do | ||
{ | ||
comparand = initial_value; | ||
initial_value = _InterlockedCompareExchange64(field, value, comparand); | ||
} | ||
while (comparand != initial_value); | ||
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return initial_value; | ||
#endif | ||
} | ||
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static int64_t __inline hdr_atomic_add_fetch_64(volatile int64_t* field, int64_t value) | ||
{ | ||
#if defined(_WIN64) | ||
return _InterlockedExchangeAdd64(field, value) + value; | ||
#else | ||
int64_t comparand; | ||
int64_t initial_value = *field; | ||
do | ||
{ | ||
comparand = initial_value; | ||
initial_value = _InterlockedCompareExchange64(field, comparand + value, comparand); | ||
} | ||
while (comparand != initial_value); | ||
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return initial_value + value; | ||
#endif | ||
} | ||
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static bool __inline hdr_atomic_compare_exchange_64(volatile int64_t* field, int64_t* expected, int64_t desired) | ||
{ | ||
return *expected == _InterlockedCompareExchange64(field, desired, *expected); | ||
} | ||
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#elif defined(__ATOMIC_SEQ_CST) | ||
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#define hdr_atomic_load_pointer(x) __atomic_load_n(x, __ATOMIC_SEQ_CST) | ||
#define hdr_atomic_store_pointer(f,v) __atomic_store_n(f,v, __ATOMIC_SEQ_CST) | ||
#define hdr_atomic_load_64(x) __atomic_load_n(x, __ATOMIC_SEQ_CST) | ||
#define hdr_atomic_store_64(f,v) __atomic_store_n(f,v, __ATOMIC_SEQ_CST) | ||
#define hdr_atomic_exchange_64(f,i) __atomic_exchange_n(f,i, __ATOMIC_SEQ_CST) | ||
#define hdr_atomic_add_fetch_64(field, value) __atomic_add_fetch(field, value, __ATOMIC_SEQ_CST) | ||
#define hdr_atomic_compare_exchange_64(field, expected, desired) __atomic_compare_exchange_n(field, expected, desired, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) | ||
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#elif defined(__x86_64__) | ||
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#include <stdint.h> | ||
#include <stdbool.h> | ||
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static inline void* hdr_atomic_load_pointer(void** pointer) | ||
{ | ||
void* p = *pointer; | ||
asm volatile ("" ::: "memory"); | ||
return p; | ||
} | ||
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static inline void hdr_atomic_store_pointer(void** pointer, void* value) | ||
{ | ||
asm volatile ("lock; xchgq %0, %1" : "+q" (value), "+m" (*pointer)); | ||
} | ||
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static inline int64_t hdr_atomic_load_64(int64_t* field) | ||
{ | ||
int64_t i = *field; | ||
asm volatile ("" ::: "memory"); | ||
return i; | ||
} | ||
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static inline void hdr_atomic_store_64(int64_t* field, int64_t value) | ||
{ | ||
asm volatile ("lock; xchgq %0, %1" : "+q" (value), "+m" (*field)); | ||
} | ||
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static inline int64_t hdr_atomic_exchange_64(volatile int64_t* field, int64_t value) | ||
{ | ||
int64_t result = 0; | ||
asm volatile ("lock; xchgq %1, %2" : "=r" (result), "+q" (value), "+m" (*field)); | ||
return result; | ||
} | ||
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static inline int64_t hdr_atomic_add_fetch_64(volatile int64_t* field, int64_t value) | ||
{ | ||
return __sync_add_and_fetch(field, value); | ||
} | ||
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static inline bool hdr_atomic_compare_exchange_64(volatile int64_t* field, int64_t* expected, int64_t desired) | ||
{ | ||
int64_t original; | ||
asm volatile( "lock; cmpxchgq %2, %1" : "=a"(original), "+m"(*field) : "q"(desired), "0"(*expected)); | ||
return original == *expected; | ||
} | ||
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#else | ||
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#error "Unable to determine atomic operations for your platform" | ||
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#endif | ||
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#endif /* HDR_ATOMIC_H__ */ |
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