73 lines
2.9 KiB
C
73 lines
2.9 KiB
C
/*
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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 _SEMAPHORE_H
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#define _SEMAPHORE_H
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#include <sys/cdefs.h>
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#include <sys/types.h>
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__BEGIN_DECLS
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struct timespec;
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typedef struct {
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unsigned int count;
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#ifdef __LP64__
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int __reserved[3];
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#endif
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} sem_t;
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#define SEM_FAILED __BIONIC_CAST(reinterpret_cast, sem_t*, 0)
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int sem_clockwait(sem_t* _Nonnull __sem, clockid_t __clock, const struct timespec* _Nonnull __ts) __INTRODUCED_IN(30);
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int sem_destroy(sem_t* _Nonnull __sem);
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int sem_getvalue(sem_t* _Nonnull __sem, int* _Nonnull __value);
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int sem_init(sem_t* _Nonnull __sem, int __shared, unsigned int __value);
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int sem_post(sem_t* _Nonnull __sem);
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int sem_timedwait(sem_t* _Nonnull __sem, const struct timespec* _Nonnull __ts);
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/*
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* POSIX historically only supported using sem_timedwait() with CLOCK_REALTIME, however that is
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* typically inappropriate, since that clock can change dramatically, causing the timeout to either
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* expire earlier or much later than intended. This function is added to use a timespec based
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* on CLOCK_MONOTONIC that does not suffer from this issue.
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* Note that sem_clockwait() allows specifying an arbitrary clock and has superseded this
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* function.
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*/
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int sem_timedwait_monotonic_np(sem_t* _Nonnull __sem, const struct timespec* _Nonnull __ts) __INTRODUCED_IN(28);
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int sem_trywait(sem_t* _Nonnull __sem);
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int sem_wait(sem_t* _Nonnull __sem);
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/* These aren't actually implemented. */
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sem_t* _Nullable sem_open(const char* _Nonnull __name, int _flags, ...);
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int sem_close(sem_t* _Nonnull __sem);
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int sem_unlink(const char* _Nonnull __name);
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__END_DECLS
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#endif
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