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Merge pull request #31321 from julianaito/master

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Add __atomic_* operators support for atomic operations
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Rémi Verschelde 2019-08-15 02:55:39 +02:00 committed by GitHub
commit b030834b63
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1 changed files with 8 additions and 8 deletions
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16
core/safe_refcount.h
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@ -97,8 +97,8 @@ static _ALWAYS_INLINE_ T atomic_exchange_if_greater(volatile T *pw, volatile V v
/* Implementation for GCC & Clang */
// GCC guarantees atomic intrinsics for sizes of 1, 2, 4 and 8 bytes.
// Clang states it supports GCC atomic builtins.
#include <stdbool.h>
#include <atomic>
template <class T>
static _ALWAYS_INLINE_ T atomic_conditional_increment(volatile T *pw) {
@ -107,7 +107,7 @@ static _ALWAYS_INLINE_ T atomic_conditional_increment(volatile T *pw) {
T tmp = static_cast<T const volatile &>(*pw);
if (tmp == 0)
return 0; // if zero, can't add to it anymore
if (__sync_val_compare_and_swap(pw, tmp, tmp + 1) == tmp)
if (__atomic_compare_exchange_n(pw, &tmp, tmp + 1, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) == true)
return tmp + 1;
}
}
@ -115,25 +115,25 @@ static _ALWAYS_INLINE_ T atomic_conditional_increment(volatile T *pw) {
template <class T>
static _ALWAYS_INLINE_ T atomic_decrement(volatile T *pw) {
return __sync_sub_and_fetch(pw, 1);
return __atomic_sub_fetch(pw, 1, __ATOMIC_SEQ_CST);
}
template <class T>
static _ALWAYS_INLINE_ T atomic_increment(volatile T *pw) {
return __sync_add_and_fetch(pw, 1);
return __atomic_add_fetch(pw, 1, __ATOMIC_SEQ_CST);
}
template <class T, class V>
static _ALWAYS_INLINE_ T atomic_sub(volatile T *pw, volatile V val) {
return __sync_sub_and_fetch(pw, val);
return __atomic_sub_fetch(pw, val, __ATOMIC_SEQ_CST);
}
template <class T, class V>
static _ALWAYS_INLINE_ T atomic_add(volatile T *pw, volatile V val) {
return __sync_add_and_fetch(pw, val);
return __atomic_add_fetch(pw, val, __ATOMIC_SEQ_CST);
}
template <class T, class V>
@ -143,7 +143,7 @@ static _ALWAYS_INLINE_ T atomic_exchange_if_greater(volatile T *pw, volatile V v
T tmp = static_cast<T const volatile &>(*pw);
if (tmp >= val)
return tmp; // already greater, or equal
if (__sync_val_compare_and_swap(pw, tmp, val) == tmp)
if (__atomic_compare_exchange_n(pw, &tmp, val, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) == true)
return val;
}
}