1d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com/* 2d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com * Copyright 2013 Google Inc. 3d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com * 4d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com * Use of this source code is governed by a BSD-style license that can be 5d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com * found in the LICENSE file. 6d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com */ 7d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com 8d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com#ifndef SkAtomics_win_DEFINED 9d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com#define SkAtomics_win_DEFINED 10d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com 11d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com/** Windows Interlocked atomics. */ 12d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com 13d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com#include <intrin.h> 14d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com#include <stdint.h> 15d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com 16d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com//MSDN says in order to declare an interlocked function for use as an 17d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com//intrinsic, include intrin.h and put the function in a #pragma intrinsic 18d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com//directive. 19d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com//The pragma appears to be unnecessary, but doesn't hurt. 20d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com#pragma intrinsic(_InterlockedIncrement, _InterlockedExchangeAdd, _InterlockedDecrement) 21d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com#pragma intrinsic(_InterlockedCompareExchange) 22d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com 23d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.comstatic inline int32_t sk_atomic_inc(int32_t* addr) { 24d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com // InterlockedIncrement returns the new value, we want to return the old. 25d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com return _InterlockedIncrement(reinterpret_cast<long*>(addr)) - 1; 26d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com} 27d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com 28d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.comstatic inline int32_t sk_atomic_add(int32_t* addr, int32_t inc) { 29d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com return _InterlockedExchangeAdd(reinterpret_cast<long*>(addr), static_cast<long>(inc)); 30d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com} 31d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com 32d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.comstatic inline int32_t sk_atomic_dec(int32_t* addr) { 33d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com // InterlockedDecrement returns the new value, we want to return the old. 34d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com return _InterlockedDecrement(reinterpret_cast<long*>(addr)) + 1; 35d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com} 36d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com 37d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.comstatic inline void sk_membar_acquire__after_atomic_dec() { } 38d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com 394b5fba5a3cc29058088a9a62df1da83e1a3c7db0commit-bot@chromium.orgstatic inline bool sk_atomic_cas(int32_t* addr, int32_t before, int32_t after) { 404b5fba5a3cc29058088a9a62df1da83e1a3c7db0commit-bot@chromium.org return _InterlockedCompareExchange(reinterpret_cast<long*>(addr), after, before) == before; 414b5fba5a3cc29058088a9a62df1da83e1a3c7db0commit-bot@chromium.org} 424b5fba5a3cc29058088a9a62df1da83e1a3c7db0commit-bot@chromium.org 4381496fb21637cc8d2a2b45a790e0f9d6d6f769c4commit-bot@chromium.orgstatic inline void* sk_atomic_cas(void** addr, void* before, void* after) { 4481496fb21637cc8d2a2b45a790e0f9d6d6f769c4commit-bot@chromium.org return InterlockedCompareExchangePointer(addr, after, before); 4581496fb21637cc8d2a2b45a790e0f9d6d6f769c4commit-bot@chromium.org} 4681496fb21637cc8d2a2b45a790e0f9d6d6f769c4commit-bot@chromium.org 47d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.comstatic inline void sk_membar_acquire__after_atomic_conditional_inc() { } 48d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com 49d9947f605a335363b0a0541d6d8cb7a7113ed788bungeman@google.com#endif 50