1 | /**
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2 | * @file
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3 | * SNMP thread synchronization implementation.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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8 | * All rights reserved.
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9 | *
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10 | * Redistribution and use in source and binary forms, with or without modification,
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11 | * are permitted provided that the following conditions are met:
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12 | *
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13 | * 1. Redistributions of source code must retain the above copyright notice,
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14 | * this list of conditions and the following disclaimer.
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15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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16 | * this list of conditions and the following disclaimer in the documentation
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17 | * and/or other materials provided with the distribution.
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18 | * 3. The name of the author may not be used to endorse or promote products
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19 | * derived from this software without specific prior written permission.
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20 | *
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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30 | * OF SUCH DAMAGE.
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31 | *
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32 | * Author: Dirk Ziegelmeier <dziegel@gmx.de>
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33 | */
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34 |
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35 | #include "lwip/apps/snmp_opts.h"
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36 |
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37 | #if LWIP_SNMP && (NO_SYS == 0) /* don't build if not configured for use in lwipopts.h */
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38 |
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39 | #include "lwip/apps/snmp_threadsync.h"
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40 | #include "lwip/apps/snmp_core.h"
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41 | #include "lwip/sys.h"
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42 | #include <string.h>
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43 |
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44 | static void
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45 | call_synced_function(struct threadsync_data *call_data, snmp_threadsync_called_fn fn)
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46 | {
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47 | sys_mutex_lock(&call_data->threadsync_node->instance->sem_usage_mutex);
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48 | call_data->threadsync_node->instance->sync_fn(fn, call_data);
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49 | sys_sem_wait(&call_data->threadsync_node->instance->sem);
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50 | sys_mutex_unlock(&call_data->threadsync_node->instance->sem_usage_mutex);
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51 | }
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52 |
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53 | static void
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54 | threadsync_get_value_synced(void *ctx)
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55 | {
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56 | struct threadsync_data *call_data = (struct threadsync_data *)ctx;
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57 |
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58 | if (call_data->proxy_instance.get_value != NULL) {
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59 | call_data->retval.s16 = call_data->proxy_instance.get_value(&call_data->proxy_instance, call_data->arg1.value);
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60 | } else {
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61 | call_data->retval.s16 = -1;
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62 | }
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63 |
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64 | sys_sem_signal(&call_data->threadsync_node->instance->sem);
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65 | }
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66 |
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67 | static s16_t
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68 | threadsync_get_value(struct snmp_node_instance *instance, void *value)
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69 | {
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70 | struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr;
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71 |
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72 | call_data->arg1.value = value;
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73 | call_synced_function(call_data, threadsync_get_value_synced);
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74 |
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75 | return call_data->retval.s16;
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76 | }
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77 |
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78 | static void
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79 | threadsync_set_test_synced(void *ctx)
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80 | {
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81 | struct threadsync_data *call_data = (struct threadsync_data *)ctx;
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82 |
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83 | if (call_data->proxy_instance.set_test != NULL) {
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84 | call_data->retval.err = call_data->proxy_instance.set_test(&call_data->proxy_instance, call_data->arg2.len, call_data->arg1.value);
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85 | } else {
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86 | call_data->retval.err = SNMP_ERR_NOTWRITABLE;
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87 | }
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88 |
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89 | sys_sem_signal(&call_data->threadsync_node->instance->sem);
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90 | }
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91 |
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92 | static snmp_err_t
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93 | threadsync_set_test(struct snmp_node_instance *instance, u16_t len, void *value)
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94 | {
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95 | struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr;
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96 |
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97 | call_data->arg1.value = value;
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98 | call_data->arg2.len = len;
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99 | call_synced_function(call_data, threadsync_set_test_synced);
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100 |
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101 | return call_data->retval.err;
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102 | }
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103 |
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104 | static void
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105 | threadsync_set_value_synced(void *ctx)
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106 | {
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107 | struct threadsync_data *call_data = (struct threadsync_data *)ctx;
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108 |
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109 | if (call_data->proxy_instance.set_value != NULL) {
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110 | call_data->retval.err = call_data->proxy_instance.set_value(&call_data->proxy_instance, call_data->arg2.len, call_data->arg1.value);
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111 | } else {
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112 | call_data->retval.err = SNMP_ERR_NOTWRITABLE;
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113 | }
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114 |
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115 | sys_sem_signal(&call_data->threadsync_node->instance->sem);
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116 | }
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117 |
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118 | static snmp_err_t
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119 | threadsync_set_value(struct snmp_node_instance *instance, u16_t len, void *value)
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120 | {
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121 | struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr;
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122 |
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123 | call_data->arg1.value = value;
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124 | call_data->arg2.len = len;
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125 | call_synced_function(call_data, threadsync_set_value_synced);
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126 |
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127 | return call_data->retval.err;
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128 | }
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129 |
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130 | static void
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131 | threadsync_release_instance_synced(void *ctx)
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132 | {
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133 | struct threadsync_data *call_data = (struct threadsync_data *)ctx;
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134 |
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135 | call_data->proxy_instance.release_instance(&call_data->proxy_instance);
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136 |
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137 | sys_sem_signal(&call_data->threadsync_node->instance->sem);
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138 | }
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139 |
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140 | static void
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141 | threadsync_release_instance(struct snmp_node_instance *instance)
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142 | {
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143 | struct threadsync_data *call_data = (struct threadsync_data *)instance->reference.ptr;
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144 |
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145 | if (call_data->proxy_instance.release_instance != NULL) {
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146 | call_synced_function(call_data, threadsync_release_instance_synced);
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147 | }
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148 | }
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149 |
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150 | static void
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151 | get_instance_synced(void *ctx)
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152 | {
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153 | struct threadsync_data *call_data = (struct threadsync_data *)ctx;
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154 | const struct snmp_leaf_node *leaf = (const struct snmp_leaf_node *)(const void *)call_data->proxy_instance.node;
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155 |
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156 | call_data->retval.err = leaf->get_instance(call_data->arg1.root_oid, call_data->arg2.root_oid_len, &call_data->proxy_instance);
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157 |
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158 | sys_sem_signal(&call_data->threadsync_node->instance->sem);
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159 | }
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160 |
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161 | static void
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162 | get_next_instance_synced(void *ctx)
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163 | {
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164 | struct threadsync_data *call_data = (struct threadsync_data *)ctx;
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165 | const struct snmp_leaf_node *leaf = (const struct snmp_leaf_node *)(const void *)call_data->proxy_instance.node;
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166 |
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167 | call_data->retval.err = leaf->get_next_instance(call_data->arg1.root_oid, call_data->arg2.root_oid_len, &call_data->proxy_instance);
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168 |
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169 | sys_sem_signal(&call_data->threadsync_node->instance->sem);
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170 | }
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171 |
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172 | static snmp_err_t
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173 | do_sync(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance, snmp_threadsync_called_fn fn)
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174 | {
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175 | const struct snmp_threadsync_node *threadsync_node = (const struct snmp_threadsync_node *)(const void *)instance->node;
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176 | struct threadsync_data *call_data = &threadsync_node->instance->data;
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177 |
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178 | if (threadsync_node->node.node.oid != threadsync_node->target->node.oid) {
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179 | LWIP_DEBUGF(SNMP_DEBUG, ("Sync node OID does not match target node OID"));
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180 | return SNMP_ERR_NOSUCHINSTANCE;
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181 | }
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182 |
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183 | memset(&call_data->proxy_instance, 0, sizeof(call_data->proxy_instance));
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184 |
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185 | instance->reference.ptr = call_data;
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186 | snmp_oid_assign(&call_data->proxy_instance.instance_oid, instance->instance_oid.id, instance->instance_oid.len);
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187 |
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188 | call_data->proxy_instance.node = &threadsync_node->target->node;
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189 | call_data->threadsync_node = threadsync_node;
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190 |
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191 | call_data->arg1.root_oid = root_oid;
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192 | call_data->arg2.root_oid_len = root_oid_len;
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193 | call_synced_function(call_data, fn);
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194 |
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195 | if (call_data->retval.err == SNMP_ERR_NOERROR) {
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196 | instance->access = call_data->proxy_instance.access;
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197 | instance->asn1_type = call_data->proxy_instance.asn1_type;
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198 | instance->release_instance = threadsync_release_instance;
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199 | instance->get_value = (call_data->proxy_instance.get_value != NULL) ? threadsync_get_value : NULL;
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200 | instance->set_value = (call_data->proxy_instance.set_value != NULL) ? threadsync_set_value : NULL;
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201 | instance->set_test = (call_data->proxy_instance.set_test != NULL) ? threadsync_set_test : NULL;
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202 | snmp_oid_assign(&instance->instance_oid, call_data->proxy_instance.instance_oid.id, call_data->proxy_instance.instance_oid.len);
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203 | }
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204 |
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205 | return call_data->retval.err;
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206 | }
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207 |
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208 | snmp_err_t
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209 | snmp_threadsync_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance)
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210 | {
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211 | return do_sync(root_oid, root_oid_len, instance, get_instance_synced);
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212 | }
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213 |
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214 | snmp_err_t
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215 | snmp_threadsync_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance *instance)
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216 | {
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217 | return do_sync(root_oid, root_oid_len, instance, get_next_instance_synced);
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218 | }
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219 |
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220 | /** Initializes thread synchronization instance */
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221 | void snmp_threadsync_init(struct snmp_threadsync_instance *instance, snmp_threadsync_synchronizer_fn sync_fn)
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222 | {
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223 | err_t err = sys_mutex_new(&instance->sem_usage_mutex);
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224 | LWIP_ASSERT("Failed to set up mutex", err == ERR_OK);
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225 | err = sys_sem_new(&instance->sem, 0);
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226 | LWIP_UNUSED_ARG(err); /* in case of LWIP_NOASSERT */
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227 | LWIP_ASSERT("Failed to set up semaphore", err == ERR_OK);
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228 | instance->sync_fn = sync_fn;
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229 | }
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230 |
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231 | #endif /* LWIP_SNMP */
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