Subversion Repositories shark

Rev

Rev 2 | Rev 80 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 pj 1
/*
2
 * Project: S.Ha.R.K.
3
 *
4
 * Coordinators:
5
 *   Giorgio Buttazzo    <giorgio@sssup.it>
6
 *   Paolo Gai           <pj@gandalf.sssup.it>
7
 *
8
 * Authors     :
9
 *   Paolo Gai           <pj@gandalf.sssup.it>
10
 *   Massimiliano Giorgi <massy@gandalf.sssup.it>
11
 *   Luca Abeni          <luca@gandalf.sssup.it>
12
 *   (see the web pages for full authors list)
13
 *
14
 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
15
 *
16
 * http://www.sssup.it
17
 * http://retis.sssup.it
18
 * http://shark.sssup.it
19
 */
20
 
21
/***************************************
22
 
23
 Semaphores for the kernel
24
 
25
***************************************/
26
 
27
/*
28
 * CVS :        $Id: semaph.h,v 1.1.1.1 2002-03-29 14:12:51 pj Exp $
29
 *
30
 * File:        $File$
31
 * Revision:    $Revision: 1.1.1.1 $
32
 * Last update: $Date: 2002-03-29 14:12:51 $
33
 */
34
 
35
/*
36
 * Copyright (C) 1999 Massimiliano Giorgi
37
 *
38
 * This program is free software; you can redistribute it and/or modify
39
 * it under the terms of the GNU General Public License as published by
40
 * the Free Software Foundation; either version 2 of the License, or
41
 * (at your option) any later version.
42
 *
43
 * This program is distributed in the hope that it will be useful,
44
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
45
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
46
 * GNU General Public License for more details.
47
 *
48
 * You should have received a copy of the GNU General Public License
49
 * along with this program; if not, write to the Free Software
50
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
51
 *
52
 */
53
 
54
#ifndef _FS_SEMAPH_H
55
#define _FS_SEMAPH_H
56
 
57
#include <kernel/int_sem.h>
58
 
59
/*+ a semaphore object +*/
60
typedef internal_sem_t __sem_t;
61
 
62
/*
63
  The following macros can be used to synchronize events; all
64
  require a pointer to a semaphore object and return nothing;
65
  a semaphore can have "val" resource free.
66
 */
67
 
68
/*+ Initialize a semaphore (to integer val) +*/
69
#define __sem_init(ptr,val) internal_sem_init((ptr),(val))
70
 
71
/*+ Wait for a semaphore +*/
72
#define __sem_wait(ptr)     (internal_sem_wait(ptr))
73
 
74
/*+ Try to wait for a semaphore (return 0 on success) +*/
75
#define __sem_trywait(ptr)  (internal_sem_trywait(ptr))
76
 
77
/*+ Signal a semaphore +*/
78
#define __sem_signal(ptr)   (internal_sem_post(ptr))
79
 
80
 
81
 
82
 
83
#if 0
84
 
85
/*
86
#include <hartik/const.h>
87
 
88
typedef struct {
89
  QUEUE queue;
90
  int   value;
91
} __semaph_t;
92
 
93
void __semaph_init(__semaph_t *, int val);
94
void __semaph_lock(__semaph_t *);
95
int  __semaph_trylock(__semaph_t *);
96
void __semaph_unlock(__semaph_t *);
97
*/
98
 
99
/*
100
 * temporary hack
101
 */
102
 
103
#include <h/sys/kern.h>
104
#include <h/sys/const.h>
105
 
106
#ifdef FSCHECKSEMAPH
107
#include <fs/assert.h> 
108
#define checksemaph(x) _assert((x)>=0&&(x)<MAX_SEM)
109
#else
110
#define checksemaph(x)
111
#endif
112
 
113
/*+ a semaphore object +*/
114
typedef SEM __sem_t;
115
 
116
/*
117
  The following macros can be used to synchronize events; all
118
  require a pointer to a semaphore object and return nothing;
119
  a semaphore can have "val" resource free.
120
 */
121
 
122
/*+ Initialize a semaphore (to integer val) +*/
123
#define __sem_init(ptr,val) {*(ptr)=sem_create(val); checksemaph(*ptr);}
124
 
125
/*+ Wait for a semaphore +*/
126
#define __sem_wait(ptr)     {checksemaph(*ptr); sem_wait(*(ptr),BLOCK);}
127
 
128
/*+ Try to wait for a semaphore (return 0 on success) +*/
129
#define __sem_trywait(ptr)  (!sem_wait(*(ptr),NON_BLOCK))
130
 
131
/*+ Signal a semaphore +*/
132
#define __sem_signal(ptr)   {checksemaph(*ptr); sem_signal(*(ptr));}
133
 
134
#endif
135
 
136
 
137
 
138
#endif
139
 
140
 
141
 
142