1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 #ifndef _SYS_ATOMICS_H
29 #define _SYS_ATOMICS_H
30
31 #include <sys/cdefs.h>
32 #include <sys/time.h>
33
34 __BEGIN_DECLS
35
36 static inline __attribute__((always_inline)) int
__atomic_cmpxchg(int old,int _new,volatile int * ptr)37 __atomic_cmpxchg(int old, int _new, volatile int *ptr)
38 {
39 return !__sync_bool_compare_and_swap (ptr, old, _new);
40 }
41
42 static inline __attribute__((always_inline)) int
__atomic_swap(int _new,volatile int * ptr)43 __atomic_swap(int _new, volatile int *ptr)
44 {
45 return __sync_lock_test_and_set(ptr, _new);
46 }
47
48 static inline __attribute__((always_inline)) int
__atomic_dec(volatile int * ptr)49 __atomic_dec(volatile int *ptr)
50 {
51 return __sync_fetch_and_sub (ptr, 1);
52 }
53
54 static inline __attribute__((always_inline)) int
__atomic_inc(volatile int * ptr)55 __atomic_inc(volatile int *ptr)
56 {
57 return __sync_fetch_and_add (ptr, 1);
58 }
59
60 int __futex_wait(volatile void *ftx, int val, const struct timespec *timeout);
61 int __futex_wake(volatile void *ftx, int count);
62
63 __END_DECLS
64
65 #endif /* _SYS_ATOMICS_H */
66