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Diffstat (limited to 'sysroot/usr/include/sys/atomics.h')
-rw-r--r-- | sysroot/usr/include/sys/atomics.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/sysroot/usr/include/sys/atomics.h b/sysroot/usr/include/sys/atomics.h new file mode 100644 index 0000000..3ada8de --- /dev/null +++ b/sysroot/usr/include/sys/atomics.h @@ -0,0 +1,84 @@ +/* + * 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> + +__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); +} + + +int __futex_wait(volatile void *ftx, int val, const struct timespec *timeout); +int __futex_wake(volatile void *ftx, int count); + +__END_DECLS + +#endif /* _SYS_ATOMICS_H */ |