2017-10-22 16:38:26 +01:00
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/*
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* Copyright © 2015 Intel
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef UTIL_FUTEX_H
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#define UTIL_FUTEX_H
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#if defined(HAVE_LINUX_FUTEX_H)
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#include <limits.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <linux/futex.h>
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#include <sys/syscall.h>
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#include <sys/time.h>
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2017-10-22 16:38:46 +01:00
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static inline long sys_futex(void *addr1, int op, int val1, const struct timespec *timeout, void *addr2, int val3)
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2017-10-22 16:38:26 +01:00
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{
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return syscall(SYS_futex, addr1, op, val1, timeout, addr2, val3);
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}
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static inline int futex_wake(uint32_t *addr, int count)
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{
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return sys_futex(addr, FUTEX_WAKE, count, NULL, NULL, 0);
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}
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2017-10-22 16:38:46 +01:00
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static inline int futex_wait(uint32_t *addr, int32_t value, const struct timespec *timeout)
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2017-10-22 16:38:26 +01:00
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{
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2017-10-22 16:38:46 +01:00
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/* FUTEX_WAIT_BITSET with FUTEX_BITSET_MATCH_ANY is equivalent to
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* FUTEX_WAIT, except that it treats the timeout as absolute. */
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return sys_futex(addr, FUTEX_WAIT_BITSET, value, timeout, NULL,
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FUTEX_BITSET_MATCH_ANY);
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2017-10-22 16:38:26 +01:00
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}
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#endif
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#endif /* UTIL_FUTEX_H */
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