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2 | pj | 1 | /* |
2 | * Project: S.Ha.R.K. |
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3 | * |
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4 | * Coordinators: |
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5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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6 | * Paolo Gai <pj@gandalf.sssup.it> |
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7 | * |
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8 | * Authors : |
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9 | * Paolo Gai <pj@gandalf.sssup.it> |
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10 | * Massimiliano Giorgi <massy@gandalf.sssup.it> |
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11 | * Luca Abeni <luca@gandalf.sssup.it> |
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12 | * (see the web pages for full authors list) |
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13 | * |
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14 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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15 | * |
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16 | * http://www.sssup.it |
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17 | * http://retis.sssup.it |
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18 | * http://shark.sssup.it |
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19 | */ |
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20 | |||
21 | /*************************************** |
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22 | |||
23 | Mutexs for the kernel |
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24 | |||
25 | ***************************************/ |
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26 | |||
27 | /* |
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80 | pj | 28 | * CVS : $Id: mutex.h,v 1.2 2003-03-13 13:37:58 pj Exp $ |
2 | pj | 29 | * |
30 | * File: $File$ |
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80 | pj | 31 | * Revision: $Revision: 1.2 $ |
32 | * Last update: $Date: 2003-03-13 13:37:58 $ |
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2 | pj | 33 | */ |
34 | |||
35 | /* |
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36 | * Copyright (C) 1999,2000 Massimiliano Giorgi |
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37 | * |
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38 | * This program is free software; you can redistribute it and/or modify |
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39 | * it under the terms of the GNU General Public License as published by |
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40 | * the Free Software Foundation; either version 2 of the License, or |
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41 | * (at your option) any later version. |
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42 | * |
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43 | * This program is distributed in the hope that it will be useful, |
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44 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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45 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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46 | * GNU General Public License for more details. |
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47 | * |
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48 | * You should have received a copy of the GNU General Public License |
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49 | * along with this program; if not, write to the Free Software |
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50 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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51 | * |
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52 | */ |
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53 | |||
54 | #ifndef _FS_MUTEX_H |
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55 | #define _FS_MUTEX_H |
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56 | |||
57 | /* |
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58 | * standard mutex |
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59 | */ |
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60 | |||
61 | #include <kernel/int_sem.h> |
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80 | pj | 62 | #include "ll/sys/cdefs.h" |
2 | pj | 63 | |
80 | pj | 64 | __BEGIN_DECLS |
65 | |||
2 | pj | 66 | /*+ a semaphore object +*/ |
67 | typedef internal_sem_t __mutex_t; |
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68 | |||
69 | /* |
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70 | The following macros can be used to synchronize events; all |
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71 | require a pointer to a semaphore object and return nothing; |
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72 | a semaphore can have "val" resource free. |
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73 | */ |
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74 | |||
75 | /*+ Initialize a semaphore (to integer val) +*/ |
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76 | #define __mutex_init(ptr,attr) internal_sem_init((ptr),1) |
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77 | |||
78 | /*+ Wait for a semaphore +*/ |
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79 | #define __mutex_lock(ptr) (internal_sem_wait(ptr)) |
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80 | |||
81 | /*+ Try to wait for a semaphore (return 0 on success) +*/ |
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82 | #define __mutex_trylock(ptr) (internal_sem_wait(ptr)) |
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83 | |||
84 | /*+ Signal a semaphore +*/ |
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85 | #define __mutex_unlock(ptr) (internal_sem_post(ptr)) |
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86 | |||
87 | #if 0 |
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88 | /* start old implementation */ |
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89 | |||
90 | #include <kernel/model.h> |
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91 | #include <kernel/func.h> |
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92 | #include <fs/assert.h> |
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93 | |||
94 | /*+ a mutex object +*/ |
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95 | typedef mutex_t __mutex_t; |
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96 | |||
97 | /* |
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98 | The following macros require a pointer to a mutex object and |
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99 | return nothing. |
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100 | */ |
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101 | |||
102 | /* Initialize a mutex object +*/ |
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103 | #define __mutex_init(ptr,attr) _assert(mutex_init(ptr,attr)==0) |
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104 | /*+ Lock a mutex object +*/ |
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105 | #define __mutex_lock(ptr) _assert(mutex_lock(ptr)==0) |
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106 | /*+ Try to lock a mutex (return 0 on success locking) +*/ |
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107 | #define __mutex_trylock(ptr) (mutex_trylock((ptr))) |
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108 | /*+ Unlock a mutex +*/ |
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109 | #define __mutex_unlock(ptr) _assert(mutex_unlock(ptr)==0) |
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110 | |||
111 | /* end old implementation */ |
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112 | #endif |
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113 | |||
114 | /* |
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115 | * fast mutex |
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116 | */ |
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117 | |||
118 | #include <kernel/func.h> |
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119 | |||
120 | typedef SYS_FLAGS __fastmutex_t; |
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121 | |||
122 | #define __fastmutex_init(ptr) |
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123 | #define __fastmutex_lock(ptr) *ptr=kern_fsave() |
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124 | #define __fastmutex_unlock(ptr) kern_frestore(*ptr) |
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125 | |||
126 | #if 0 |
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127 | |||
128 | /* Hartik 3.x implemantation */ |
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129 | |||
130 | /* |
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131 | #include <hartik/const.h> |
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132 | |||
133 | typedef struct { |
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134 | QUEUE queue; |
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135 | int value; |
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136 | } __mutex_t; |
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137 | |||
138 | void __mutex_init(__mytex_t *); |
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139 | void __mutex_lock(__mytex_t *); |
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140 | int __mutex_trylock(__mytex_t *); |
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141 | void __mutex_unlock(__mytex_t *); |
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142 | */ |
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143 | |||
144 | /* |
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145 | * temporary hack |
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146 | */ |
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147 | |||
148 | #include <h/sys/kern.h> |
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149 | #include <h/sys/const.h> |
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150 | |||
151 | /*+ a mutex object +*/ |
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152 | typedef SEM __mutex_t; |
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153 | |||
154 | /* |
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155 | The following macros require a pointer to a mutex object and |
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156 | return nothing. |
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157 | */ |
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158 | |||
159 | #ifdef FSCHECKMUTEX |
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160 | #include <fs/assert.h> |
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161 | #define checkmutex(x) assert((x)>=0&&(x)<MAX_SEM) |
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162 | #else |
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163 | #define checkmutex(x) |
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164 | #endif |
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165 | |||
166 | /* Initialize a mutex object +*/ |
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167 | #define __mutex_init(ptr) { *(ptr)=sem_create(1); checkmutex(*ptr); } |
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168 | |||
169 | /*+ Lock a mutex object +*/ |
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170 | #define __mutex_lock(ptr) { checkmutex(*ptr); sem_wait(*(ptr),BLOCK); } |
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171 | |||
172 | /*+ Try to lock a mutex (return 0 on success locking) +*/ |
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173 | #define __mutex_trylock(ptr) { checkmutex(*ptr); sem_wait(*(ptr),NON_BLOCK); } |
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174 | |||
175 | /*+ Unlock a mutex +*/ |
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176 | #define __mutex_unlock(ptr) { checkmutex(*ptr); sem_signal(*(ptr)); } |
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177 | |||
178 | #endif |
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179 | |||
180 | |||
181 | |||
182 | |||
183 | |||
80 | pj | 184 | __END_DECLS |
2 | pj | 185 | #endif |
186 |