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| * Note that sem_clockwait() allows specifying an arbitrary clock and has superseded this |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