4832a0961d
Other projects in lmp-preview-dev are out of date, and it's easier to patch bionic than to fix all of them. (cherry picked from commit a856c6f543c71f6778cdb9b39f6049ae8b2c4e53) Change-Id: Id8fbdf35eb55150579f85b7bdddb5d68d3012218
73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/*
|
|
* Copyright (C) 2008 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
#ifndef _SYS_ATOMICS_H
|
|
#define _SYS_ATOMICS_H
|
|
|
|
#include <sys/cdefs.h>
|
|
#include <sys/time.h>
|
|
|
|
/* Note: this is only in the preview release. */
|
|
|
|
__BEGIN_DECLS
|
|
|
|
#define __ATOMIC_INLINE__ static __inline__ __attribute__((always_inline))
|
|
|
|
__ATOMIC_INLINE__ int
|
|
__atomic_cmpxchg(int old_value, int new_value, volatile int* ptr)
|
|
{
|
|
/* We must return 0 on success */
|
|
return __sync_val_compare_and_swap(ptr, old_value, new_value) != old_value;
|
|
}
|
|
|
|
__ATOMIC_INLINE__ int
|
|
__atomic_swap(int new_value, volatile int *ptr)
|
|
{
|
|
int old_value;
|
|
do {
|
|
old_value = *ptr;
|
|
} while (__sync_val_compare_and_swap(ptr, old_value, new_value) != old_value);
|
|
return old_value;
|
|
}
|
|
|
|
__ATOMIC_INLINE__ int
|
|
__atomic_dec(volatile int *ptr)
|
|
{
|
|
return __sync_fetch_and_sub (ptr, 1);
|
|
}
|
|
|
|
__ATOMIC_INLINE__ int
|
|
__atomic_inc(volatile int *ptr)
|
|
{
|
|
return __sync_fetch_and_add (ptr, 1);
|
|
}
|
|
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* _SYS_ATOMICS_H */
|