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- // -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
- // Copyright (c) 2014, Linaro
- // All rights reserved.
- //
- // Redistribution and use in source and binary forms, with or without
- // modification, are permitted provided that the following conditions are
- // met:
- //
- // * Redistributions of source code must retain the above copyright
- // notice, this list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above
- // copyright notice, this list of conditions and the following disclaimer
- // in the documentation and/or other materials provided with the
- // distribution.
- // * Neither the name of Google Inc. nor the names of its
- // contributors may be used to endorse or promote products derived from
- // this software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- // ---
- //
- // Author: Riku Voipio, riku.voipio@linaro.org
- //
- // atomic primitives implemented with gcc atomic intrinsics:
- // http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
- //
- #ifndef BASE_ATOMICOPS_INTERNALS_GCC_GENERIC_H_
- #define BASE_ATOMICOPS_INTERNALS_GCC_GENERIC_H_
- #include <stdio.h>
- #include <stdlib.h>
- #include "base/basictypes.h"
- typedef int32_t Atomic32;
- namespace base {
- namespace subtle {
- typedef int64_t Atomic64;
- inline void MemoryBarrier() {
- __sync_synchronize();
- }
- inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
- Atomic32 old_value,
- Atomic32 new_value) {
- Atomic32 prev_value = old_value;
- __atomic_compare_exchange_n(ptr, &prev_value, new_value,
- 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED);
- return prev_value;
- }
- inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
- Atomic32 new_value) {
- return __atomic_exchange_n(const_cast<Atomic32*>(ptr), new_value, __ATOMIC_RELAXED);
- }
- inline Atomic32 Acquire_AtomicExchange(volatile Atomic32* ptr,
- Atomic32 new_value) {
- return __atomic_exchange_n(const_cast<Atomic32*>(ptr), new_value, __ATOMIC_ACQUIRE);
- }
- inline Atomic32 Release_AtomicExchange(volatile Atomic32* ptr,
- Atomic32 new_value) {
- return __atomic_exchange_n(const_cast<Atomic32*>(ptr), new_value, __ATOMIC_RELEASE);
- }
- inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
- Atomic32 old_value,
- Atomic32 new_value) {
- Atomic32 prev_value = old_value;
- __atomic_compare_exchange_n(ptr, &prev_value, new_value,
- 0, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED);
- return prev_value;
- }
- inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
- Atomic32 old_value,
- Atomic32 new_value) {
- Atomic32 prev_value = old_value;
- __atomic_compare_exchange_n(ptr, &prev_value, new_value,
- 0, __ATOMIC_RELEASE, __ATOMIC_RELAXED);
- return prev_value;
- }
- inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
- *ptr = value;
- }
- inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
- *ptr = value;
- MemoryBarrier();
- }
- inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
- MemoryBarrier();
- *ptr = value;
- }
- inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
- return *ptr;
- }
- inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
- Atomic32 value = *ptr;
- MemoryBarrier();
- return value;
- }
- inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
- MemoryBarrier();
- return *ptr;
- }
- // 64-bit versions
- inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
- Atomic64 old_value,
- Atomic64 new_value) {
- Atomic64 prev_value = old_value;
- __atomic_compare_exchange_n(ptr, &prev_value, new_value,
- 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED);
- return prev_value;
- }
- inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
- Atomic64 new_value) {
- return __atomic_exchange_n(const_cast<Atomic64*>(ptr), new_value, __ATOMIC_RELAXED);
- }
- inline Atomic64 Acquire_AtomicExchange(volatile Atomic64* ptr,
- Atomic64 new_value) {
- return __atomic_exchange_n(const_cast<Atomic64*>(ptr), new_value, __ATOMIC_ACQUIRE);
- }
- inline Atomic64 Release_AtomicExchange(volatile Atomic64* ptr,
- Atomic64 new_value) {
- return __atomic_exchange_n(const_cast<Atomic64*>(ptr), new_value, __ATOMIC_RELEASE);
- }
- inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
- Atomic64 old_value,
- Atomic64 new_value) {
- Atomic64 prev_value = old_value;
- __atomic_compare_exchange_n(ptr, &prev_value, new_value,
- 0, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED);
- return prev_value;
- }
- inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
- Atomic64 old_value,
- Atomic64 new_value) {
- Atomic64 prev_value = old_value;
- __atomic_compare_exchange_n(ptr, &prev_value, new_value,
- 0, __ATOMIC_RELEASE, __ATOMIC_RELAXED);
- return prev_value;
- }
- inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
- *ptr = value;
- }
- inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
- *ptr = value;
- MemoryBarrier();
- }
- inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
- MemoryBarrier();
- *ptr = value;
- }
- inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
- return *ptr;
- }
- inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
- Atomic64 value = *ptr;
- MemoryBarrier();
- return value;
- }
- inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
- MemoryBarrier();
- return *ptr;
- }
- } // namespace base::subtle
- } // namespace base
- #endif // BASE_ATOMICOPS_INTERNALS_GCC_GENERIC_H_
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