1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 #ifndef _LINUXKPI_LINUX_SEMAPHORE_H_ 30 #define _LINUXKPI_LINUX_SEMAPHORE_H_ 31 32 #include "los_sem_pri.h" 33 34 #ifdef __cplusplus 35 #if __cplusplus 36 extern "C" { 37 #endif /* __cplusplus */ 38 #endif /* __cplusplus */ 39 40 #define UNINIT_VALUE 0xFFFFFFFF 41 #define ERESTARTSYS 512 /* The return vlaue of down_interruptiable in Linux */ 42 43 struct semaphore { 44 LosSemCB *sem; 45 int count; 46 }; 47 48 typedef struct semaphore losMutexDef_t; 49 #define DECLARE_MUTEX(x) struct semaphore x = { (LosSemCB *)UNINIT_VALUE, 1 } 50 #define DECLARE_MUTEX_LOCKED(x) struct semaphore x = { (LosSemCB *)UNINIT_VALUE, 0 } 51 #define DEFINE_SEMAPHORE(x) DECLARE_MUTEX(x) 52 53 extern int _sema_lock(losMutexDef_t *sem); 54 extern int _sema_unlock(losMutexDef_t *sem); 55 extern int _sema_init(losMutexDef_t *sem, unsigned int value); 56 extern int _sema_destory(losMutexDef_t *sem); 57 extern int _sema_trylock(losMutexDef_t *sem); 58 59 #define init_MUTEX(sem) _sema_init((losMutexDef_t*)(sem), 1) 60 #define destory_MUTEX(sem) _sema_destory((losMutexDef_t*)(sem)) 61 #define init_MUTEX_LOCKED(sem) (VOID)_sema_init((losMutexDef_t*)(sem), 0); 62 #define down(sem) _sema_lock((losMutexDef_t*)(sem)) 63 #define down_interruptible(sem) _sema_lock((losMutexDef_t*)(sem)) 64 #define down_trylock(sem) _sema_trylock((losMutexDef_t*)(sem)) 65 #define up(sem) _sema_unlock((losMutexDef_t*)(sem)) 66 67 #define sema_init(sem, n) do { \ 68 if ((n) == 1) { \ 69 init_MUTEX(sem); \ 70 } else { \ 71 init_MUTEX_LOCKED(sem); \ 72 } \ 73 } while (0) 74 75 #define sema_destory(sem) do { \ 76 destory_MUTEX(sem); \ 77 } while (0) 78 79 #ifdef __cplusplus 80 #if __cplusplus 81 } 82 #endif /* __cplusplus */ 83 #endif /* __cplusplus */ 84 85 #endif /* _LINUXKPI_LINUX_SEMAPHORE_H_ */ 86