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annotate packages/net/snmp/lib/current/src/mt_support.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 95f3e12a6327
children d2c90368aeef
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1 //==========================================================================
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2 //
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3 // ./lib/current/src/mt_support.c
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4 //
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5 //
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6 //==========================================================================
208
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7 //####ECOSGPLCOPYRIGHTBEGIN####
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8 // -------------------------------------------
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9 // This file is part of eCos, the Embedded Configurable Operating System.
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10 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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11 //
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12 // eCos is free software; you can redistribute it and/or modify it under
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13 // the terms of the GNU General Public License as published by the Free
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14 // Software Foundation; either version 2 or (at your option) any later version.
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15 //
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16 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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17 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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18 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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19 // for more details.
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20 //
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21 // You should have received a copy of the GNU General Public License along
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22 // with eCos; if not, write to the Free Software Foundation, Inc.,
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23 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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24 //
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25 // As a special exception, if other files instantiate templates or use macros
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26 // or inline functions from this file, or you compile this file and link it
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27 // with other works to produce a work based on this file, this file does not
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28 // by itself cause the resulting work to be covered by the GNU General Public
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29 // License. However the source code for this file must still be made available
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30 // in accordance with section (3) of the GNU General Public License.
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31 //
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32 // This exception does not invalidate any other reasons why a work based on
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33 // this file might be covered by the GNU General Public License.
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34 //
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35 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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36 // at http://sources.redhat.com/ecos/ecos-license
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37 // -------------------------------------------
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38 //####ECOSGPLCOPYRIGHTEND####
103
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39 //####UCDSNMPCOPYRIGHTBEGIN####
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40 //
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41 // -------------------------------------------
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42 //
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43 // Portions of this software may have been derived from the UCD-SNMP
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44 // project, <http://ucd-snmp.ucdavis.edu/> from the University of
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45 // California at Davis, which was originally based on the Carnegie Mellon
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46 // University SNMP implementation. Portions of this software are therefore
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47 // covered by the appropriate copyright disclaimers included herein.
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48 //
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49 // The release used was version 4.1.2 of May 2000. "ucd-snmp-4.1.2"
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50 // -------------------------------------------
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51 //
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52 //####UCDSNMPCOPYRIGHTEND####
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53 //==========================================================================
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54 //#####DESCRIPTIONBEGIN####
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55 //
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56 // Author(s): hmt
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57 // Contributors: hmt
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58 // Date: 2000-05-30
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59 // Purpose: Port of UCD-SNMP distribution to eCos.
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60 // Description:
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61 //
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62 //
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63 //####DESCRIPTIONEND####
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64 //
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65 //==========================================================================
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66 /********************************************************************
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67 Copyright 1989, 1991, 1992 by Carnegie Mellon University
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68
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69 Derivative Work -
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70 Copyright 1996, 1998, 1999, 2000 The Regents of the University of California
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71
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72 All Rights Reserved
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73
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74 Permission to use, copy, modify and distribute this software and its
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75 documentation for any purpose and without fee is hereby granted,
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76 provided that the above copyright notice appears in all copies and
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77 that both that copyright notice and this permission notice appear in
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78 supporting documentation, and that the name of CMU and The Regents of
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79 the University of California not be used in advertising or publicity
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80 pertaining to distribution of the software without specific written
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81 permission.
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82
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83 CMU AND THE REGENTS OF THE UNIVERSITY OF CALIFORNIA DISCLAIM ALL
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84 WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED
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85 WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL CMU OR
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86 THE REGENTS OF THE UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY SPECIAL,
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87 INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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88 FROM THE LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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89 CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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90 CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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91 *********************************************************************/
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92
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93 /* mt_support.c - multi-thread resource locking support */
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94 /*
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95 * Author: Markku Laukkanen
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96 * Created: 6-Sep-1999
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97 * History:
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98 * 8-Sep-1999 M. Slifcak method names changed;
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99 * use array of resource locking structures.
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100 */
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101
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102 #include <config.h>
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103 #include <errno.h>
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104 #include "mt_support.h"
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105
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106 #ifdef __cplusplus
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107 extern "C" {
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108 #endif
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109
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110 #ifdef _REENTRANT
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111
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112 static
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113 mutex_type s_res[MT_MAX_IDS][MT_LIB_MAXIMUM]; /* locking structures */
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114
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115 static mutex_type * _mt_res(int groupID, int resourceID)
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116 {
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117 if (groupID < 1) return 0;
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118 if (groupID >= MT_MAX_IDS) return 0;
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119 if (resourceID < 1) return 0;
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120 if (resourceID >= MT_LIB_MAXIMUM) return 0;
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121 return (&s_res[groupID][resourceID]);
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122 }
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123
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124 static
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125 int snmp_res_init_mutex(mutex_type * mutex)
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126 {
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127 int rc = 0;
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128 #if HAVE_PTHREAD_H
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129 rc = pthread_mutex_init(mutex, MT_MUTEX_INIT_DEFAULT);
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130 #elif defined(WIN32)
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131 InitializeCriticalSection(mutex);
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132 #endif
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133
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134 return rc;
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135 }
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136
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137 int snmp_res_init(void)
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138 {
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139 int ii, jj;
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140 int rc = 0;
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141 mutex_type *mutex;
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142
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143 for (jj = 0; (0 == rc) && (jj < MT_MAX_IDS); jj++)
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144 for (ii = 0; (0 == rc) && (ii < MT_LIB_MAXIMUM); ii++)
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145 {
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146 mutex = _mt_res(jj, ii);
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147 if (!mutex) continue;
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148 rc = snmp_res_init_mutex( mutex );
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149 }
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150
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151 return rc;
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152 }
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153
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154 int snmp_res_destroy_mutex(int groupID, int resourceID)
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155 {
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156 int rc = 0;
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157 mutex_type *mutex = _mt_res(groupID, resourceID);
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158 if (!mutex) return EFAULT;
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159
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160 #if HAVE_PTHREAD_H
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161 rc = pthread_mutex_destroy(mutex);
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162 #elif defined(WIN32)
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163 DeleteCriticalSection(mutex);
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164 #endif
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165
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166 return rc;
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167 }
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168
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169 int snmp_res_lock(int groupID, int resourceID)
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170 {
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171 int rc = 0;
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172 mutex_type *mutex = _mt_res(groupID, resourceID);
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173 if (!mutex) return EFAULT;
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174
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175 #if HAVE_PTHREAD_H
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176 rc = pthread_mutex_lock(mutex);
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177 #elif defined(WIN32)
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178 EnterCriticalSection(mutex);
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179 #endif
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180
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181 return rc;
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182 }
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183
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184 int snmp_res_unlock(int groupID, int resourceID)
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185 {
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186 int rc = 0;
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187 mutex_type *mutex = _mt_res(groupID, resourceID);
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188 if (!mutex) return EFAULT;
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189
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190 #if HAVE_PTHREAD_H
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191 rc = pthread_mutex_unlock(mutex);
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192 #elif defined(WIN32)
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193 LeaveCriticalSection(mutex);
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194 #endif
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195
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196 return rc;
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197 }
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198
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199
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200 #else /* !_REENTRANT */
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201
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202 #ifdef WIN32
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203
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204 /* Provide "do nothing" targets for Release (.DLL) builds. */
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205 #undef snmp_res_init
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206 #undef snmp_res_lock
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207 #undef snmp_res_unlock
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208 #undef snmp_res_destroy_mutex
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209
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210 int snmp_res_init(void) { return 0; }
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211 int snmp_res_lock(int groupID, int resourceID) { return 0; }
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212 int snmp_res_unlock(int groupID, int resourceID) { return 0; }
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213 int snmp_res_destroy_mutex(int groupID, int resourceID) { return 0; }
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214 #endif /* !WIN32 */
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215
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216 #endif /* !_REENTRANT */
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217
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218
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219 #ifdef __cplusplus
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220 };
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221 #endif
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222