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