diff options
| author | Rémi Verschelde <rverschelde@gmail.com> | 2019-09-01 12:19:44 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2019-09-01 12:19:44 +0200 |
| commit | c8ae8f2fb187fc690764e576d5dcc31637b1109c (patch) | |
| tree | 2d5f11a469713c6b265591ab8e2d29854d0fa0cd | |
| parent | 5dd51a5b3b3da516c0e8bb2855d2772def037203 (diff) | |
Revert "Add __atomic_* operators support for atomic operations"
| -rw-r--r-- | core/safe_refcount.h | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/core/safe_refcount.h b/core/safe_refcount.h index 0b65ffb9ca..54f540b0c7 100644 --- a/core/safe_refcount.h +++ b/core/safe_refcount.h @@ -97,8 +97,8 @@ static _ALWAYS_INLINE_ T atomic_exchange_if_greater(volatile T *pw, volatile V v /* Implementation for GCC & Clang */ -#include <stdbool.h> -#include <atomic> +// GCC guarantees atomic intrinsics for sizes of 1, 2, 4 and 8 bytes. +// Clang states it supports GCC atomic builtins. 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 (__atomic_compare_exchange_n(pw, &tmp, tmp + 1, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) == true) + if (__sync_val_compare_and_swap(pw, tmp, tmp + 1) == tmp) 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 __atomic_sub_fetch(pw, 1, __ATOMIC_SEQ_CST); + return __sync_sub_and_fetch(pw, 1); } template <class T> static _ALWAYS_INLINE_ T atomic_increment(volatile T *pw) { - return __atomic_add_fetch(pw, 1, __ATOMIC_SEQ_CST); + return __sync_add_and_fetch(pw, 1); } template <class T, class V> static _ALWAYS_INLINE_ T atomic_sub(volatile T *pw, volatile V val) { - return __atomic_sub_fetch(pw, val, __ATOMIC_SEQ_CST); + return __sync_sub_and_fetch(pw, val); } template <class T, class V> static _ALWAYS_INLINE_ T atomic_add(volatile T *pw, volatile V val) { - return __atomic_add_fetch(pw, val, __ATOMIC_SEQ_CST); + return __sync_add_and_fetch(pw, val); } 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 (__atomic_compare_exchange_n(pw, &tmp, val, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) == true) + if (__sync_val_compare_and_swap(pw, tmp, val) == tmp) return val; } } |