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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Atomic operations
*/
#ifndef _DALVIK_ATOMIC
#define _DALVIK_ATOMIC
#include <cutils/atomic.h> /* use common Android atomic ops */
#include <cutils/atomic-inline.h> /* and some uncommon ones */
/*
* Full memory barrier. Ensures compiler ordering and SMP behavior.
*/
#define MEM_BARRIER() ANDROID_MEMBAR_FULL()
/*
* 32-bit atomic compare-and-swap macro. Performs a memory barrier
* before the swap (store-release).
*
* If *_addr equals "_old", replace it with "_new" and return nonzero
* (i.e. returns "false" if the operation fails).
*
* Underlying function is currently declared:
* int release_cas(int32_t old, int32_t new, volatile int32_t* addr)
*
* TODO: rename macro to ATOMIC_RELEASE_CAS
*/
#define ATOMIC_CMP_SWAP(_addr, _old, _new) \
(android_atomic_release_cas((_old), (_new), (_addr)) == 0)
/*
* NOTE: Two "quasiatomic" operations on the exact same memory address
* are guaranteed to operate atomically with respect to each other,
* but no guarantees are made about quasiatomic operations mixed with
* non-quasiatomic operations on the same address, nor about
* quasiatomic operations that are performed on partially-overlapping
* memory.
*/
/*
* TODO: rename android_quasiatomic_* to dvmQuasiatomic*. Don't want to do
* that yet due to branch merge issues.
*/
int64_t android_quasiatomic_swap_64(int64_t value, volatile int64_t* addr);
int64_t android_quasiatomic_read_64(volatile int64_t* addr);
int android_quasiatomic_cmpxchg_64(int64_t oldvalue, int64_t newvalue,
volatile int64_t* addr);
#endif /*_DALVIK_ATOMIC*/
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