1 /* 2 * Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without modification, 5 * are permitted provided that the following conditions are met: 6 * 7 * 1. Redistributions of source code must retain the above copyright notice, this list of 8 * conditions and the following disclaimer. 9 * 10 * 2. Redistributions in binary form must reproduce the above copyright notice, this list 11 * of conditions and the following disclaimer in the documentation and/or other materials 12 * provided with the distribution. 13 * 14 * 3. Neither the name of the copyright holder nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific prior written 16 * permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 22 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef _ADAPT_SEMAPHORE_H 32 #define _ADAPT_SEMAPHORE_H 33 34 #include <sys/features.h> 35 #include <time.h> 36 #include <fcntl.h> 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 #define SEM_FAILED ((sem_t *)0) 43 #define __SEM_NUM 4 44 45 typedef struct { 46 volatile int __val[__SEM_NUM * sizeof(long) / sizeof(int)]; 47 } sem_t; 48 49 int sem_init(sem_t *sem, int shared, unsigned value); 50 int sem_destroy(sem_t *sem); 51 int sem_wait(sem_t *sem); 52 int sem_post(sem_t *sem); 53 int sem_timedwait(sem_t *__restrict sem, const struct timespec *__restrict timeout); 54 int sem_getvalue(sem_t *__restrict sem, int *__restrict currVal); 55 56 #ifdef __cplusplus 57 } 58 #endif 59 60 #endif /* !_ADAPT_SEMAPHORE_H */ 61