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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 | |
21 | extern "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(__mips__) | |
51 | #include <cutils/atomic-mips.h> | |
52 | #else | |
53 | #error atomic operations are unsupported | |
54 | #endif | |
55 | ||
56 | #if ANDROID_SMP == 0 | |
57 | #define ANDROID_MEMBAR_FULL android_compiler_barrier | |
58 | #else | |
59 | #define ANDROID_MEMBAR_FULL android_memory_barrier | |
60 | #endif | |
61 | ||
62 | #if ANDROID_SMP == 0 | |
63 | #define ANDROID_MEMBAR_STORE android_compiler_barrier | |
64 | #else | |
65 | #define ANDROID_MEMBAR_STORE android_memory_store_barrier | |
66 | #endif | |
67 | ||
68 | #ifdef __cplusplus | |
69 | } | |
70 | #endif | |
71 | ||
72 | #endif /* ANDROID_CUTILS_ATOMIC_INLINE_H */ |