62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef BIONIC_ATOMIC_GCC_BUILTIN_H
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#define BIONIC_ATOMIC_GCC_BUILTIN_H
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/* This header file is used by default if we don't have optimized atomic
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* routines for a given platform. See bionic_atomic_arm.h and
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* bionic_atomic_x86.h for examples.
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*/
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__ATOMIC_INLINE__ void
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__bionic_memory_barrier(void)
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{
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__sync_synchronize();
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}
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__ATOMIC_INLINE__ int
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__bionic_cmpxchg(int32_t old_value, int32_t new_value, volatile int32_t* ptr)
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{
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/* We must return 0 on success */
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return __sync_val_compare_and_swap(ptr, old_value, new_value) != old_value;
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}
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__ATOMIC_INLINE__ int32_t
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__bionic_swap(int32_t new_value, volatile int32_t* ptr)
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{
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int32_t old_value;
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do {
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old_value = *ptr;
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} while (__sync_val_compare_and_swap(ptr, old_value, new_value) != old_value);
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return old_value;
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}
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__ATOMIC_INLINE__ int32_t
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__bionic_atomic_inc(volatile int32_t* ptr)
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{
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/* We must return the old value */
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return __sync_fetch_and_add(ptr, 1);
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}
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__ATOMIC_INLINE__ int32_t
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__bionic_atomic_dec(volatile int32_t* ptr)
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{
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/* We must return the old value */
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return __sync_fetch_and_add(ptr, -1);
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}
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#endif /* BIONIC_ATOMIC_GCC_BUILTIN_H */
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