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author | bunnei <bunneidev@gmail.com> | 2022-04-03 23:26:28 +0200 |
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committer | GitHub <noreply@github.com> | 2022-04-03 23:26:28 +0200 |
commit | e9cf2d43f1fb62dd06f9e8ef2e51cb43147ad808 (patch) | |
tree | aa18db7afeb453c32f1c3e2eae328d059c39e490 /src/common/atomic_ops.h | |
parent | Merge pull request #8135 from Morph1984/websession-hack (diff) | |
parent | native_clock: Use writeback from CAS to avoid double-loading (diff) | |
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Diffstat (limited to '')
-rw-r--r-- | src/common/atomic_ops.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/src/common/atomic_ops.h b/src/common/atomic_ops.h index b94d73c7a..69fde8421 100644 --- a/src/common/atomic_ops.h +++ b/src/common/atomic_ops.h @@ -46,6 +46,50 @@ namespace Common { reinterpret_cast<__int64*>(expected.data())) != 0; } +[[nodiscard]] inline bool AtomicCompareAndSwap(volatile u8* pointer, u8 value, u8 expected, + u8& actual) { + actual = + _InterlockedCompareExchange8(reinterpret_cast<volatile char*>(pointer), value, expected); + return actual == expected; +} + +[[nodiscard]] inline bool AtomicCompareAndSwap(volatile u16* pointer, u16 value, u16 expected, + u16& actual) { + actual = + _InterlockedCompareExchange16(reinterpret_cast<volatile short*>(pointer), value, expected); + return actual == expected; +} + +[[nodiscard]] inline bool AtomicCompareAndSwap(volatile u32* pointer, u32 value, u32 expected, + u32& actual) { + actual = + _InterlockedCompareExchange(reinterpret_cast<volatile long*>(pointer), value, expected); + return actual == expected; +} + +[[nodiscard]] inline bool AtomicCompareAndSwap(volatile u64* pointer, u64 value, u64 expected, + u64& actual) { + actual = _InterlockedCompareExchange64(reinterpret_cast<volatile __int64*>(pointer), value, + expected); + return actual == expected; +} + +[[nodiscard]] inline bool AtomicCompareAndSwap(volatile u64* pointer, u128 value, u128 expected, + u128& actual) { + const bool result = + _InterlockedCompareExchange128(reinterpret_cast<volatile __int64*>(pointer), value[1], + value[0], reinterpret_cast<__int64*>(expected.data())) != 0; + actual = expected; + return result; +} + +[[nodiscard]] inline u128 AtomicLoad128(volatile u64* pointer) { + u128 result{}; + _InterlockedCompareExchange128(reinterpret_cast<volatile __int64*>(pointer), result[1], + result[0], reinterpret_cast<__int64*>(result.data())); + return result; +} + #else [[nodiscard]] inline bool AtomicCompareAndSwap(volatile u8* pointer, u8 value, u8 expected) { @@ -72,6 +116,52 @@ namespace Common { return __sync_bool_compare_and_swap((unsigned __int128*)pointer, expected_a, value_a); } +[[nodiscard]] inline bool AtomicCompareAndSwap(volatile u8* pointer, u8 value, u8 expected, + u8& actual) { + actual = __sync_val_compare_and_swap(pointer, expected, value); + return actual == expected; +} + +[[nodiscard]] inline bool AtomicCompareAndSwap(volatile u16* pointer, u16 value, u16 expected, + u16& actual) { + actual = __sync_val_compare_and_swap(pointer, expected, value); + return actual == expected; +} + +[[nodiscard]] inline bool AtomicCompareAndSwap(volatile u32* pointer, u32 value, u32 expected, + u32& actual) { + actual = __sync_val_compare_and_swap(pointer, expected, value); + return actual == expected; +} + +[[nodiscard]] inline bool AtomicCompareAndSwap(volatile u64* pointer, u64 value, u64 expected, + u64& actual) { + actual = __sync_val_compare_and_swap(pointer, expected, value); + return actual == expected; +} + +[[nodiscard]] inline bool AtomicCompareAndSwap(volatile u64* pointer, u128 value, u128 expected, + u128& actual) { + unsigned __int128 value_a; + unsigned __int128 expected_a; + unsigned __int128 actual_a; + std::memcpy(&value_a, value.data(), sizeof(u128)); + std::memcpy(&expected_a, expected.data(), sizeof(u128)); + actual_a = __sync_val_compare_and_swap((unsigned __int128*)pointer, expected_a, value_a); + std::memcpy(actual.data(), &actual_a, sizeof(u128)); + return actual_a == expected_a; +} + +[[nodiscard]] inline u128 AtomicLoad128(volatile u64* pointer) { + unsigned __int128 zeros_a = 0; + unsigned __int128 result_a = + __sync_val_compare_and_swap((unsigned __int128*)pointer, zeros_a, zeros_a); + + u128 result; + std::memcpy(result.data(), &result_a, sizeof(u128)); + return result; +} + #endif } // namespace Common |