atomic-inline.h revision 096041174b1d8cc09b06c51053b2b7e8545bd93f 
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#ifdef __cplusplus
21extern "C" {
22#endif
23
24/*
25 * Inline declarations and macros for some special-purpose atomic
26 * operations.  These are intended for rare circumstances where a
27 * memory barrier needs to be issued inline rather than as a function
28 * call.
29 *
30 * Most code should not use these.
31 *
32 * Anything that does include this file must set ANDROID_SMP to either
33 * 0 or 1, indicating compilation for UP or SMP, respectively.
34 *
35 * Macros defined in this header:
36 *
37 * void ANDROID_MEMBAR_FULL(void)
38 *   Full memory barrier.  Provides a compiler reordering barrier, and
39 *   on SMP systems emits an appropriate instruction.
40 */
41
42#if !defined(ANDROID_SMP)
43# error "Must define ANDROID_SMP before including atomic-inline.h"
44#endif
45
46#if defined(__arm__)
47#include <cutils/atomic-arm.h>
48#elif defined(__i386__) || defined(__x86_64__)
49#include <cutils/atomic-x86.h>
50#elif defined(__sh__)
51/* implementation is in atomic-android-sh.c */
52#elif defined(__mips__)
53#include <cutils/atomic-mips.h>
54#else
55#error atomic operations are unsupported
56#endif
57
58#if ANDROID_SMP == 0
59#define ANDROID_MEMBAR_FULL android_compiler_barrier
60#else
61#define ANDROID_MEMBAR_FULL android_memory_barrier
62#endif
63
64#if ANDROID_SMP == 0
65#define ANDROID_MEMBAR_STORE android_compiler_barrier
66#else
67#define ANDROID_MEMBAR_STORE android_memory_store_barrier
68#endif
69
70#ifdef __cplusplus
71}
72#endif
73
74#endif /* ANDROID_CUTILS_ATOMIC_INLINE_H */
75