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78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
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/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _BIONIC_FUTEX_H
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#define _BIONIC_FUTEX_H
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#include <errno.h>
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#include <linux/futex.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <sys/cdefs.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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__BEGIN_DECLS
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struct timespec;
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static inline __always_inline int __futex(volatile void* ftx, int op, int value,
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const struct timespec* timeout,
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int bitset) {
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// Our generated syscall assembler sets errno, but our callers (pthread functions) don't want to.
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int saved_errno = errno;
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int result = syscall(__NR_futex, ftx, op, value, timeout, NULL, bitset);
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if (__predict_false(result == -1)) {
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result = -errno;
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errno = saved_errno;
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}
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return result;
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}
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static inline int __futex_wake(volatile void* ftx, int count) {
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return __futex(ftx, FUTEX_WAKE, count, NULL, 0);
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}
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static inline int __futex_wake_ex(volatile void* ftx, bool shared, int count) {
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return __futex(ftx, shared ? FUTEX_WAKE : FUTEX_WAKE_PRIVATE, count, NULL, 0);
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}
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static inline int __futex_wait(volatile void* ftx, int value, const struct timespec* timeout) {
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return __futex(ftx, FUTEX_WAIT, value, timeout, 0);
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}
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static inline int __futex_wait_ex(volatile void* ftx, bool shared, int value,
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bool use_realtime_clock, const struct timespec* abs_timeout) {
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return __futex(ftx, (shared ? FUTEX_WAIT_BITSET : FUTEX_WAIT_BITSET_PRIVATE) |
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(use_realtime_clock ? FUTEX_CLOCK_REALTIME : 0), value, abs_timeout,
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FUTEX_BITSET_MATCH_ANY);
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}
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__END_DECLS
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#endif /* _BIONIC_FUTEX_H */
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