| /* |
| * 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*/ |