| 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 */ |