466dbe4444
All these inlines were turned in to out of line definitions in L. This brings us a step closer to being able to just use the current bionic headers for the NDK, rather than having many old versions of them. Change-Id: Ie010bc727d78d3742abc577c70f6578db2e68625
73 lines
2.7 KiB
C
73 lines
2.7 KiB
C
/*
|
|
* Copyright (C) 2015 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 _ANDROID_LEGACY_SYS_ATOMICS_INLINES_H_
|
|
#define _ANDROID_LEGACY_SYS_ATOMICS_INLINES_H_
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
__BEGIN_DECLS
|
|
|
|
/* Note: atomic operations that were exported by the C library didn't
|
|
* provide any memory barriers, which created potential issues on
|
|
* multi-core devices. We now define them as inlined calls to
|
|
* GCC sync builtins, which always provide a full barrier.
|
|
*
|
|
* NOTE: The C library still exports atomic functions by the same
|
|
* name to ensure ABI stability for existing NDK machine code.
|
|
*
|
|
* If you are an NDK developer, we encourage you to rebuild your
|
|
* unmodified sources against this header as soon as possible.
|
|
*/
|
|
#define __ATOMIC_INLINE__ static __inline __attribute__((always_inline))
|
|
|
|
__ATOMIC_INLINE__ int __atomic_cmpxchg(int old, int _new, volatile int *ptr) {
|
|
/* We must return 0 on success */
|
|
return __sync_val_compare_and_swap(ptr, old, _new) != old;
|
|
}
|
|
|
|
__ATOMIC_INLINE__ int __atomic_swap(int _new, volatile int *ptr) {
|
|
int prev;
|
|
do {
|
|
prev = *ptr;
|
|
} while (__sync_val_compare_and_swap(ptr, prev, _new) != prev);
|
|
return prev;
|
|
}
|
|
|
|
__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 /* _ANDROID_LEGACY_SYS_ATOMICS_INLINES_H_ */
|