78 lines
2.9 KiB
C
78 lines
2.9 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 _BIONIC_FUTEX_H
|
|
#define _BIONIC_FUTEX_H
|
|
|
|
#include <errno.h>
|
|
#include <linux/futex.h>
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
#include <sys/cdefs.h>
|
|
#include <sys/syscall.h>
|
|
#include <unistd.h>
|
|
|
|
__BEGIN_DECLS
|
|
|
|
struct timespec;
|
|
|
|
static inline __always_inline int __futex(volatile void* ftx, int op, int value,
|
|
const struct timespec* timeout,
|
|
int bitset) {
|
|
// Our generated syscall assembler sets errno, but our callers (pthread functions) don't want to.
|
|
int saved_errno = errno;
|
|
int result = syscall(__NR_futex, ftx, op, value, timeout, NULL, bitset);
|
|
if (__predict_false(result == -1)) {
|
|
result = -errno;
|
|
errno = saved_errno;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static inline int __futex_wake(volatile void* ftx, int count) {
|
|
return __futex(ftx, FUTEX_WAKE, count, NULL, 0);
|
|
}
|
|
|
|
static inline int __futex_wake_ex(volatile void* ftx, bool shared, int count) {
|
|
return __futex(ftx, shared ? FUTEX_WAKE : FUTEX_WAKE_PRIVATE, count, NULL, 0);
|
|
}
|
|
|
|
static inline int __futex_wait(volatile void* ftx, int value, const struct timespec* timeout) {
|
|
return __futex(ftx, FUTEX_WAIT, value, timeout, 0);
|
|
}
|
|
|
|
static inline int __futex_wait_ex(volatile void* ftx, bool shared, int value,
|
|
bool use_realtime_clock, const struct timespec* abs_timeout) {
|
|
return __futex(ftx, (shared ? FUTEX_WAIT_BITSET : FUTEX_WAIT_BITSET_PRIVATE) |
|
|
(use_realtime_clock ? FUTEX_CLOCK_REALTIME : 0), value, abs_timeout,
|
|
FUTEX_BITSET_MATCH_ANY);
|
|
}
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* _BIONIC_FUTEX_H */
|