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 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 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 49 __atomic_dec(volatile int *ptr) 50 { 51 return __sync_fetch_and_sub (ptr, 1); 52 } 53 54 static inline __attribute__((always_inline)) int 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
