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
36extern "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
43struct semaphore {
44    LosSemCB *sem;
45    int count;
46};
47
48typedef 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
53extern int _sema_lock(losMutexDef_t *sem);
54extern int _sema_unlock(losMutexDef_t *sem);
55extern int _sema_init(losMutexDef_t *sem, unsigned int value);
56extern int _sema_destory(losMutexDef_t *sem);
57extern 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