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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 */
     73