atomic-inline.h revision 464431e65fbede57b0d41d230fe6f6dc465c20f8
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ANDROID_CUTILS_ATOMIC_INLINE_H 18#define ANDROID_CUTILS_ATOMIC_INLINE_H 19 20/* 21 * Inline declarations and macros for some special-purpose atomic 22 * operations. These are intended for rare circumstances where a 23 * memory barrier needs to be issued inline rather than as a function 24 * call. 25 * 26 * Most code should not use these. 27 * 28 * Anything that does include this file must set ANDROID_SMP to either 29 * 0 or 1, indicating compilation for UP or SMP, respectively. 30 * 31 * Macros defined in this header: 32 * 33 * void ANDROID_MEMBAR_FULL(void) 34 * Full memory barrier. Provides a compiler reordering barrier, and 35 * on SMP systems emits an appropriate instruction. 36 */ 37 38#if !defined(ANDROID_SMP) 39# error "Must define ANDROID_SMP before including atomic-inline.h" 40#endif 41 42#if defined(__arm__) 43#include <cutils/atomic-arm.h> 44#elif defined(__i386__) || defined(__x86_64__) 45#include <cutils/atomic-x86.h> 46#elif defined(__sh__) 47/* implementation is in atomic-android-sh.c */ 48#else 49#error atomic operations are unsupported 50#endif 51 52#if ANDROID_SMP == 0 53#define ANDROID_MEMBAR_FULL android_compiler_barrier 54#else 55#define ANDROID_MEMBAR_FULL android_memory_barrier 56#endif 57 58#if ANDROID_SMP == 0 59#define ANDROID_MEMBAR_STORE android_compiler_barrier 60#else 61#define ANDROID_MEMBAR_STORE android_memory_store_barrier 62#endif 63 64#endif /* ANDROID_CUTILS_ATOMIC_INLINE_H */ 65