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1 | office | 1 | /** |
2 | * @file process_manager.c |
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3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
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4 | * |
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5 | * @section LICENSE |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 3. Neither the name of the author nor the |
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15 | * names of its contributors may be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | * |
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29 | * @section DESCRIPTION |
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30 | * |
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31 | * Module which allows starting and controlling template processes using an imperative |
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32 | * interface. |
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33 | * |
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34 | * Synopsis: |
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35 | * process_manager() |
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36 | * |
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37 | * Description: |
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38 | * Represents a set of managed processes. Each process has a "name", which is a value |
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39 | * that uniquely identifies it within its process manager. |
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40 | * When deinitialization is requested, requests termination of all managed processes |
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41 | * and waits for all of them to terminate before deinitializing. |
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42 | * Managed processes can access objects as seen from the process_manager() statement |
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43 | * via the special _caller object. |
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44 | * |
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45 | * Synopsis: |
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46 | * process_manager::start(name, string template_name, list args) |
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47 | * process_manager::start(string template_name, list args) |
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48 | * |
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49 | * Description: |
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50 | * Creates a new process from the template named 'template_name', with arguments 'args', |
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51 | * identified by 'name' within the process manager. If the two-argument form of start() is |
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52 | * used, the process does not have a name, and cannot be imperatively stopped using |
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53 | * stop(). |
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54 | * If a process with this name already exists and is not being terminated, does nothing. |
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55 | * If it exists and is being terminated, it will be restarted using the given parameters |
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56 | * after it terminates. If the process does not exist, it is created immediately, and the |
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57 | * immediate effects of the process being created happnen before the immediate effects of |
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58 | * the start() statement going up. |
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59 | * |
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60 | * Synopsis: |
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61 | * process_manager::stop(name) |
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62 | * |
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63 | * Description: |
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64 | * Initiates termination of the process identified by 'name' within the process manager. |
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65 | * If there is no such process, or the process is already being terminated, does nothing. |
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66 | * If the process does exist and is not already being terminated, termination of the |
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67 | * process is requested, and the immediate effects of the termination request happen |
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68 | * before the immediate effects of the stop() statement going up. |
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69 | */ |
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70 | |||
71 | #include <stdlib.h> |
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72 | #include <string.h> |
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73 | |||
74 | #include <misc/offset.h> |
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75 | #include <misc/debug.h> |
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76 | #include <misc/strdup.h> |
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77 | #include <misc/balloc.h> |
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78 | #include <structure/LinkedList1.h> |
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79 | |||
80 | #include <ncd/module_common.h> |
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81 | |||
82 | #include <generated/blog_channel_ncd_process_manager.h> |
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83 | |||
84 | #define RETRY_TIME 10000 |
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85 | |||
86 | #define PROCESS_STATE_RUNNING 1 |
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87 | #define PROCESS_STATE_STOPPING 2 |
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88 | #define PROCESS_STATE_RESTARTING 3 |
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89 | #define PROCESS_STATE_RETRYING 4 |
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90 | |||
91 | struct instance { |
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92 | NCDModuleInst *i; |
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93 | LinkedList1 processes_list; |
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94 | int dying; |
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95 | }; |
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96 | |||
97 | struct process { |
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98 | struct instance *manager; |
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99 | LinkedList1Node processes_list_node; |
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100 | BSmallTimer retry_timer; // running if state=retrying |
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101 | int state; |
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102 | NCD_string_id_t template_name; |
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103 | NCDValMem current_mem; |
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104 | NCDValSafeRef current_name; |
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105 | NCDValSafeRef current_args; |
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106 | NCDValMem next_mem; // next_* if state=restarting |
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107 | NCDValSafeRef next_name; |
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108 | NCDValSafeRef next_args; |
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109 | NCDModuleProcess module_process; // if state!=retrying |
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110 | }; |
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111 | |||
112 | static struct process * find_process (struct instance *o, NCDValRef name); |
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113 | static int process_new (struct instance *o, NCDValMem *mem, NCDValSafeRef name, NCDValSafeRef template_name, NCDValSafeRef args); |
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114 | static void process_free (struct process *p); |
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115 | static void process_try (struct process *p); |
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116 | static void process_retry_timer_handler (BSmallTimer *retry_timer); |
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117 | static void process_module_process_handler_event (NCDModuleProcess *module_process, int event); |
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118 | static int process_module_process_func_getspecialobj (NCDModuleProcess *module_process, NCD_string_id_t name, NCDObject *out_object); |
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119 | static int process_module_process_caller_obj_func_getobj (const NCDObject *obj, NCD_string_id_t name, NCDObject *out_object); |
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120 | static void process_stop (struct process *p); |
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121 | static int process_restart (struct process *p, NCDValMem *mem, NCDValSafeRef name, NCDValSafeRef template_name, NCDValSafeRef args); |
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122 | static void instance_free (struct instance *o); |
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123 | |||
124 | static struct process * find_process (struct instance *o, NCDValRef name) |
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125 | { |
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126 | ASSERT(!NCDVal_IsInvalid(name)) |
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127 | |||
128 | LinkedList1Node *n = LinkedList1_GetFirst(&o->processes_list); |
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129 | while (n) { |
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130 | struct process *p = UPPER_OBJECT(n, struct process, processes_list_node); |
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131 | ASSERT(p->manager == o) |
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132 | if (!NCDVal_IsInvalid(NCDVal_FromSafe(&p->current_mem, p->current_name)) && NCDVal_Compare(NCDVal_FromSafe(&p->current_mem, p->current_name), name) == 0) { |
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133 | return p; |
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134 | } |
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135 | n = LinkedList1Node_Next(n); |
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136 | } |
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137 | |||
138 | return NULL; |
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139 | } |
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140 | |||
141 | static int process_new (struct instance *o, NCDValMem *mem, NCDValSafeRef name, NCDValSafeRef template_name, NCDValSafeRef args) |
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142 | { |
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143 | ASSERT(!o->dying) |
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144 | ASSERT(NCDVal_IsInvalid(NCDVal_FromSafe(mem, name)) || !find_process(o, NCDVal_FromSafe(mem, name))) |
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145 | ASSERT(NCDVal_IsString(NCDVal_FromSafe(mem, template_name))) |
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146 | ASSERT(NCDVal_IsList(NCDVal_FromSafe(mem, args))) |
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147 | |||
148 | // allocate structure |
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149 | struct process *p = BAlloc(sizeof(*p)); |
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150 | if (!p) { |
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151 | ModuleLog(o->i, BLOG_ERROR, "BAlloc failed"); |
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152 | goto fail0; |
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153 | } |
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154 | |||
155 | // set manager |
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156 | p->manager = o; |
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157 | |||
158 | // insert to processes list |
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159 | LinkedList1_Append(&o->processes_list, &p->processes_list_node); |
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160 | |||
161 | // init retry timer |
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162 | BSmallTimer_Init(&p->retry_timer, process_retry_timer_handler); |
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163 | |||
164 | // init template name |
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165 | p->template_name = ncd_get_string_id(NCDVal_FromSafe(mem, template_name)); |
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166 | if (p->template_name < 0) { |
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167 | ModuleLog(o->i, BLOG_ERROR, "ncd_get_string_id failed"); |
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168 | goto fail1; |
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169 | } |
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170 | |||
171 | // init current mem as a copy of mem |
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172 | if (!NCDValMem_InitCopy(&p->current_mem, mem)) { |
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173 | ModuleLog(o->i, BLOG_ERROR, "NCDValMem_InitCopy failed"); |
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174 | goto fail1; |
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175 | } |
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176 | |||
177 | // remember name and args |
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178 | p->current_name = name; |
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179 | p->current_args = args; |
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180 | |||
181 | // try starting it |
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182 | process_try(p); |
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183 | return 1; |
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184 | |||
185 | fail1: |
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186 | LinkedList1_Remove(&o->processes_list, &p->processes_list_node); |
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187 | BFree(p); |
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188 | fail0: |
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189 | return 0; |
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190 | } |
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191 | |||
192 | static void process_free (struct process *p) |
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193 | { |
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194 | struct instance *o = p->manager; |
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195 | |||
196 | // free current mem |
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197 | NCDValMem_Free(&p->current_mem); |
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198 | |||
199 | // free timer |
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200 | BReactor_RemoveSmallTimer(o->i->params->iparams->reactor, &p->retry_timer); |
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201 | |||
202 | // remove from processes list |
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203 | LinkedList1_Remove(&o->processes_list, &p->processes_list_node); |
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204 | |||
205 | // free structure |
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206 | BFree(p); |
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207 | } |
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208 | |||
209 | static void process_try (struct process *p) |
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210 | { |
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211 | struct instance *o = p->manager; |
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212 | ASSERT(!o->dying) |
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213 | ASSERT(!BSmallTimer_IsRunning(&p->retry_timer)) |
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214 | |||
215 | // init module process |
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216 | if (!NCDModuleProcess_InitId(&p->module_process, o->i, p->template_name, NCDVal_FromSafe(&p->current_mem, p->current_args), process_module_process_handler_event)) { |
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217 | ModuleLog(o->i, BLOG_ERROR, "NCDModuleProcess_Init failed"); |
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218 | goto fail; |
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219 | } |
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220 | |||
221 | // set special objects function |
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222 | NCDModuleProcess_SetSpecialFuncs(&p->module_process, process_module_process_func_getspecialobj); |
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223 | |||
224 | // set state |
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225 | p->state = PROCESS_STATE_RUNNING; |
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226 | return; |
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227 | |||
228 | fail: |
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229 | // set timer |
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230 | BReactor_SetSmallTimer(o->i->params->iparams->reactor, &p->retry_timer, BTIMER_SET_RELATIVE, RETRY_TIME); |
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231 | |||
232 | // set state |
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233 | p->state = PROCESS_STATE_RETRYING; |
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234 | } |
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235 | |||
236 | static void process_retry_timer_handler (BSmallTimer *retry_timer) |
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237 | { |
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238 | struct process *p = UPPER_OBJECT(retry_timer, struct process, retry_timer); |
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239 | struct instance *o = p->manager; |
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240 | B_USE(o) |
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241 | ASSERT(p->state == PROCESS_STATE_RETRYING) |
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242 | ASSERT(!o->dying) |
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243 | |||
244 | // retry |
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245 | process_try(p); |
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246 | } |
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247 | |||
248 | void process_module_process_handler_event (NCDModuleProcess *module_process, int event) |
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249 | { |
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250 | struct process *p = UPPER_OBJECT(module_process, struct process, module_process); |
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251 | struct instance *o = p->manager; |
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252 | ASSERT(p->state != PROCESS_STATE_RETRYING) |
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253 | ASSERT(p->state != PROCESS_STATE_RESTARTING || !o->dying) |
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254 | ASSERT(!BSmallTimer_IsRunning(&p->retry_timer)) |
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255 | |||
256 | switch (event) { |
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257 | case NCDMODULEPROCESS_EVENT_UP: { |
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258 | ASSERT(p->state == PROCESS_STATE_RUNNING) |
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259 | } break; |
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260 | |||
261 | case NCDMODULEPROCESS_EVENT_DOWN: { |
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262 | ASSERT(p->state == PROCESS_STATE_RUNNING) |
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263 | |||
264 | // allow process to continue |
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265 | NCDModuleProcess_Continue(&p->module_process); |
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266 | } break; |
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267 | |||
268 | case NCDMODULEPROCESS_EVENT_TERMINATED: { |
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269 | ASSERT(p->state == PROCESS_STATE_RESTARTING || p->state == PROCESS_STATE_STOPPING) |
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270 | |||
271 | // free module process |
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272 | NCDModuleProcess_Free(&p->module_process); |
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273 | |||
274 | if (p->state == PROCESS_STATE_RESTARTING) { |
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275 | // free current mem |
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276 | NCDValMem_Free(&p->current_mem); |
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277 | |||
278 | // move next mem/values over current mem/values |
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279 | p->current_mem = p->next_mem; |
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280 | p->current_name = p->next_name; |
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281 | p->current_args = p->next_args; |
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282 | |||
283 | // try starting it again |
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284 | process_try(p); |
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285 | return; |
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286 | } |
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287 | |||
288 | // free process |
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289 | process_free(p); |
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290 | |||
291 | // if manager is dying and there are no more processes, let it die |
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292 | if (o->dying && LinkedList1_IsEmpty(&o->processes_list)) { |
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293 | instance_free(o); |
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294 | } |
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295 | } break; |
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296 | } |
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297 | } |
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298 | |||
299 | static int process_module_process_func_getspecialobj (NCDModuleProcess *module_process, NCD_string_id_t name, NCDObject *out_object) |
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300 | { |
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301 | struct process *p = UPPER_OBJECT(module_process, struct process, module_process); |
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302 | ASSERT(p->state != PROCESS_STATE_RETRYING) |
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303 | |||
304 | if (name == NCD_STRING_CALLER) { |
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305 | *out_object = NCDObject_Build(-1, p, NCDObject_no_getvar, process_module_process_caller_obj_func_getobj); |
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306 | return 1; |
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307 | } |
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308 | |||
309 | return 0; |
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310 | } |
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311 | |||
312 | static int process_module_process_caller_obj_func_getobj (const NCDObject *obj, NCD_string_id_t name, NCDObject *out_object) |
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313 | { |
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314 | struct process *p = NCDObject_DataPtr(obj); |
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315 | struct instance *o = p->manager; |
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316 | ASSERT(p->state != PROCESS_STATE_RETRYING) |
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317 | |||
318 | return NCDModuleInst_Backend_GetObj(o->i, name, out_object); |
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319 | } |
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320 | |||
321 | static void process_stop (struct process *p) |
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322 | { |
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323 | switch (p->state) { |
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324 | case PROCESS_STATE_RETRYING: { |
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325 | // free process |
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326 | process_free(p); |
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327 | } break; |
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328 | |||
329 | case PROCESS_STATE_RUNNING: { |
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330 | // request process to terminate |
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331 | NCDModuleProcess_Terminate(&p->module_process); |
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332 | |||
333 | // set state |
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334 | p->state = PROCESS_STATE_STOPPING; |
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335 | } break; |
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336 | |||
337 | case PROCESS_STATE_RESTARTING: { |
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338 | // free next mem |
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339 | NCDValMem_Free(&p->next_mem); |
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340 | |||
341 | // set state |
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342 | p->state = PROCESS_STATE_STOPPING; |
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343 | } break; |
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344 | |||
345 | case PROCESS_STATE_STOPPING: { |
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346 | // nothing to do |
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347 | } break; |
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348 | |||
349 | default: ASSERT(0); |
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350 | } |
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351 | } |
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352 | |||
353 | static int process_restart (struct process *p, NCDValMem *mem, NCDValSafeRef name, NCDValSafeRef template_name, NCDValSafeRef args) |
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354 | { |
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355 | struct instance *o = p->manager; |
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356 | ASSERT(!o->dying) |
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357 | ASSERT(p->state == PROCESS_STATE_STOPPING) |
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358 | ASSERT(!NCDVal_IsInvalid(NCDVal_FromSafe(&p->current_mem, p->current_name)) || NCDVal_IsInvalid(NCDVal_FromSafe(mem, name))) |
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359 | ASSERT(NCDVal_IsInvalid(NCDVal_FromSafe(&p->current_mem, p->current_name)) || NCDVal_Compare(NCDVal_FromSafe(mem, name), NCDVal_FromSafe(&p->current_mem, p->current_name)) == 0) |
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360 | ASSERT(NCDVal_IsString(NCDVal_FromSafe(mem, template_name))) |
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361 | ASSERT(NCDVal_IsList(NCDVal_FromSafe(mem, args))) |
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362 | |||
363 | // copy mem to next mem |
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364 | if (!NCDValMem_InitCopy(&p->next_mem, mem)) { |
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365 | ModuleLog(o->i, BLOG_ERROR, "NCDValMem_InitCopy failed"); |
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366 | goto fail0; |
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367 | } |
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368 | |||
369 | // remember name and args to next |
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370 | p->next_name = name; |
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371 | p->next_args = args; |
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372 | |||
373 | // set state |
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374 | p->state = PROCESS_STATE_RESTARTING; |
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375 | return 1; |
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376 | |||
377 | fail0: |
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378 | return 0; |
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379 | } |
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380 | |||
381 | static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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382 | { |
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383 | struct instance *o = vo; |
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384 | o->i = i; |
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385 | |||
386 | // check arguments |
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387 | if (!NCDVal_ListRead(params->args, 0)) { |
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388 | ModuleLog(o->i, BLOG_ERROR, "wrong arity"); |
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389 | goto fail0; |
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390 | } |
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391 | |||
392 | // init processes list |
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393 | LinkedList1_Init(&o->processes_list); |
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394 | |||
395 | // set not dying |
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396 | o->dying = 0; |
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397 | |||
398 | // signal up |
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399 | NCDModuleInst_Backend_Up(o->i); |
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400 | return; |
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401 | |||
402 | fail0: |
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403 | NCDModuleInst_Backend_DeadError(i); |
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404 | } |
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405 | |||
406 | void instance_free (struct instance *o) |
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407 | { |
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408 | ASSERT(LinkedList1_IsEmpty(&o->processes_list)) |
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409 | |||
410 | NCDModuleInst_Backend_Dead(o->i); |
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411 | } |
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412 | |||
413 | static void func_die (void *vo) |
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414 | { |
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415 | struct instance *o = vo; |
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416 | ASSERT(!o->dying) |
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417 | |||
418 | // request all processes to die |
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419 | LinkedList1Node *n = LinkedList1_GetFirst(&o->processes_list); |
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420 | while (n) { |
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421 | LinkedList1Node *next = LinkedList1Node_Next(n); |
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422 | struct process *p = UPPER_OBJECT(n, struct process, processes_list_node); |
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423 | process_stop(p); |
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424 | n = next; |
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425 | } |
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426 | |||
427 | // if there are no processes, die immediately |
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428 | if (LinkedList1_IsEmpty(&o->processes_list)) { |
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429 | instance_free(o); |
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430 | return; |
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431 | } |
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432 | |||
433 | // set dying |
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434 | o->dying = 1; |
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435 | } |
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436 | |||
437 | static void start_func_new (void *unused, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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438 | { |
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439 | // check arguments |
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440 | NCDValRef name_arg = NCDVal_NewInvalid(); |
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441 | NCDValRef template_name_arg; |
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442 | NCDValRef args_arg; |
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443 | if (!NCDVal_ListRead(params->args, 2, &template_name_arg, &args_arg) && |
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444 | !NCDVal_ListRead(params->args, 3, &name_arg, &template_name_arg, &args_arg) |
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445 | ) { |
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446 | ModuleLog(i, BLOG_ERROR, "wrong arity"); |
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447 | goto fail0; |
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448 | } |
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449 | if (!NCDVal_IsString(template_name_arg) || !NCDVal_IsList(args_arg)) { |
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450 | ModuleLog(i, BLOG_ERROR, "wrong type"); |
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451 | goto fail0; |
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452 | } |
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453 | |||
454 | // signal up. |
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455 | // Do it before creating the process so that the process starts initializing before our own process continues. |
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456 | NCDModuleInst_Backend_Up(i); |
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457 | |||
458 | // get method object |
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459 | struct instance *mo = NCDModuleInst_Backend_GetUser((NCDModuleInst *)params->method_user); |
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460 | |||
461 | if (!mo->dying) { |
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462 | struct process *p = (NCDVal_IsInvalid(name_arg) ? NULL : find_process(mo, name_arg)); |
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463 | if (!p || p->state == PROCESS_STATE_STOPPING) { |
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464 | if (p) { |
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465 | if (!process_restart(p, args_arg.mem, NCDVal_ToSafe(name_arg), NCDVal_ToSafe(template_name_arg), NCDVal_ToSafe(args_arg))) { |
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466 | ModuleLog(i, BLOG_ERROR, "failed to restart process"); |
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467 | goto fail0; |
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468 | } |
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469 | } else { |
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470 | if (!process_new(mo, args_arg.mem, NCDVal_ToSafe(name_arg), NCDVal_ToSafe(template_name_arg), NCDVal_ToSafe(args_arg))) { |
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471 | ModuleLog(i, BLOG_ERROR, "failed to create process"); |
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472 | goto fail0; |
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473 | } |
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474 | } |
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475 | } |
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476 | } |
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477 | |||
478 | return; |
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479 | |||
480 | fail0: |
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481 | NCDModuleInst_Backend_DeadError(i); |
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482 | } |
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483 | |||
484 | static void stop_func_new (void *unused, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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485 | { |
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486 | // check arguments |
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487 | NCDValRef name_arg; |
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488 | if (!NCDVal_ListRead(params->args, 1, &name_arg)) { |
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489 | ModuleLog(i, BLOG_ERROR, "wrong arity"); |
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490 | goto fail0; |
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491 | } |
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492 | |||
493 | // signal up. |
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494 | // Do it before stopping the process so that the process starts terminating before our own process continues. |
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495 | NCDModuleInst_Backend_Up(i); |
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496 | |||
497 | // get method object |
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498 | struct instance *mo = NCDModuleInst_Backend_GetUser((NCDModuleInst *)params->method_user); |
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499 | |||
500 | if (!mo->dying) { |
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501 | struct process *p = find_process(mo, name_arg); |
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502 | if (p && p->state != PROCESS_STATE_STOPPING) { |
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503 | process_stop(p); |
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504 | } |
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505 | } |
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506 | |||
507 | return; |
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508 | |||
509 | fail0: |
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510 | NCDModuleInst_Backend_DeadError(i); |
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511 | } |
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512 | |||
513 | static struct NCDModule modules[] = { |
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514 | { |
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515 | .type = "process_manager", |
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516 | .func_new2 = func_new, |
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517 | .func_die = func_die, |
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518 | .alloc_size = sizeof(struct instance) |
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519 | }, { |
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520 | .type = "process_manager::start", |
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521 | .func_new2 = start_func_new |
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522 | }, { |
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523 | .type = "process_manager::stop", |
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524 | .func_new2 = stop_func_new |
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525 | }, { |
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526 | .type = NULL |
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527 | } |
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528 | }; |
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529 | |||
530 | const struct NCDModuleGroup ncdmodule_process_manager = { |
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531 | .modules = modules |
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532 | }; |