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 BIONIC_ATOMIC_INLINE_H 18 #define BIONIC_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 #ifdef __cplusplus 43 extern "C" { 44 #endif 45 46 /* Define __ATOMIC_INLINE__ to control the inlining of all atomics 47 * functions declared here. For a slight performance boost, we want 48 * all of them to be always_inline 49 */ 50 #define __ATOMIC_INLINE__ static __inline__ __attribute__((always_inline)) 51 52 #ifdef __arm__ 53 # include "bionic_atomic_arm.h" 54 #elif defined(__i386__) 55 # include "bionic_atomic_x86.h" 56 #elif defined(__mips__) 57 # include "bionic_atomic_mips.h" 58 #else 59 # include "bionic_atomic_gcc_builtin.h" 60 #endif 61 62 #define ANDROID_MEMBAR_FULL __bionic_memory_barrier 63 64 #ifdef __cplusplus 65 } // extern "C" 66 #endif 67 68 #endif // BIONIC_ATOMIC_INLINE_H 69