0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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12 #if (TEST_BUILD_DEVPOLL)
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13
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14 /* Solaris declarations */
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15
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16 #define POLLREMOVE 0x0800
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17 #define DP_POLL 0xD001
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18
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19 struct dvpoll {
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20 struct pollfd *dp_fds;
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21 int dp_nfds;
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22 int dp_timeout;
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23 };
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24
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25 #endif
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26
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27
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28 typedef struct {
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29 u_int changes;
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30 u_int events;
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31 } ngx_devpoll_conf_t;
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32
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33
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34 static int ngx_devpoll_init(ngx_cycle_t *cycle);
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35 static void ngx_devpoll_done(ngx_cycle_t *cycle);
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36 static int ngx_devpoll_add_event(ngx_event_t *ev, int event, u_int flags);
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37 static int ngx_devpoll_del_event(ngx_event_t *ev, int event, u_int flags);
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38 static int ngx_devpoll_set_event(ngx_event_t *ev, int event, u_int flags);
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39 static int ngx_devpoll_process_events(ngx_cycle_t *cycle);
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40
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41 static void *ngx_devpoll_create_conf(ngx_cycle_t *cycle);
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42 static char *ngx_devpoll_init_conf(ngx_cycle_t *cycle, void *conf);
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43
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44 static int dp = -1;
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45 static struct pollfd *change_list, *event_list;
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46 static u_int nchanges, max_changes, nevents;
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47
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48 static ngx_event_t **change_index;
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49
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50
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51 static ngx_str_t devpoll_name = ngx_string("/dev/poll");
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52
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53 static ngx_command_t ngx_devpoll_commands[] = {
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54
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55 {ngx_string("devpoll_changes"),
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56 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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57 ngx_conf_set_num_slot,
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58 0,
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59 offsetof(ngx_devpoll_conf_t, changes),
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60 NULL},
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61
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62 {ngx_string("devpoll_events"),
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63 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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64 ngx_conf_set_num_slot,
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65 0,
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66 offsetof(ngx_devpoll_conf_t, events),
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67 NULL},
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68
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69 ngx_null_command
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70 };
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71
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72
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73 ngx_event_module_t ngx_devpoll_module_ctx = {
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74 &devpoll_name,
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75 ngx_devpoll_create_conf, /* create configuration */
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76 ngx_devpoll_init_conf, /* init configuration */
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77
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78 {
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79 ngx_devpoll_add_event, /* add an event */
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80 ngx_devpoll_del_event, /* delete an event */
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81 ngx_devpoll_add_event, /* enable an event */
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82 ngx_devpoll_del_event, /* disable an event */
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83 NULL, /* add an connection */
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84 NULL, /* delete an connection */
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85 NULL, /* process the changes */
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86 ngx_devpoll_process_events, /* process the events */
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87 ngx_devpoll_init, /* init the events */
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88 ngx_devpoll_done, /* done the events */
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89 }
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90
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91 };
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92
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93 ngx_module_t ngx_devpoll_module = {
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94 NGX_MODULE,
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95 &ngx_devpoll_module_ctx, /* module context */
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96 ngx_devpoll_commands, /* module directives */
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97 NGX_EVENT_MODULE, /* module type */
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98 NULL, /* init module */
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99 NULL /* init process */
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100 };
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101
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102
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103 static int ngx_devpoll_init(ngx_cycle_t *cycle)
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104 {
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105 size_t n;
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106 ngx_devpoll_conf_t *dpcf;
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107
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108 dpcf = ngx_event_get_conf(cycle->conf_ctx, ngx_devpoll_module);
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109
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110 if (dp == -1) {
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111 dp = open("/dev/poll", O_RDWR);
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112
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113 if (dp == -1) {
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114 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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115 "open(/dev/poll) failed");
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116 return NGX_ERROR;
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117 }
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118 }
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119
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120 if (max_changes < dpcf->changes) {
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121 if (nchanges) {
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122 n = nchanges * sizeof(struct pollfd);
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123 if (write(dp, change_list, n) != (ssize_t) n) {
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124 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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125 "write(/dev/poll) failed");
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126 return NGX_ERROR;
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127 }
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128
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129 nchanges = 0;
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130 }
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131
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132 if (change_list) {
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133 ngx_free(change_list);
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134 }
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135
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136 ngx_test_null(change_list,
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137 ngx_alloc(sizeof(struct pollfd) * dpcf->changes,
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138 cycle->log),
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139 NGX_ERROR);
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140
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141 if (change_index) {
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142 ngx_free(change_index);
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143 }
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144
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145 ngx_test_null(change_index,
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146 ngx_alloc(sizeof(ngx_event_t *) * dpcf->changes,
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147 cycle->log),
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148 NGX_ERROR);
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149 }
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150
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151 max_changes = dpcf->changes;
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152
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153 if (nevents < dpcf->events) {
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154 if (event_list) {
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155 ngx_free(event_list);
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156 }
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157
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158 ngx_test_null(event_list,
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159 ngx_alloc(sizeof(struct pollfd) * dpcf->events,
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160 cycle->log),
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161 NGX_ERROR);
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162 }
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163
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164 nevents = dpcf->events;
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165
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166 ngx_io = ngx_os_io;
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167
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168 ngx_event_actions = ngx_devpoll_module_ctx.actions;
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169
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170 ngx_event_flags = NGX_USE_LEVEL_EVENT;
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171
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172 return NGX_OK;
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173 }
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174
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175
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176 static void ngx_devpoll_done(ngx_cycle_t *cycle)
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177 {
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178 if (close(dp) == -1) {
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179 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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180 "close(/dev/poll) failed");
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181 }
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182
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183 dp = -1;
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184
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185 ngx_free(change_list);
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186 ngx_free(event_list);
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187 ngx_free(change_index);
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188
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189 change_list = NULL;
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190 event_list = NULL;
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191 change_index = NULL;
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192 max_changes = 0;
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193 nchanges = 0;
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194 nevents = 0;
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195 }
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196
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197
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198 static int ngx_devpoll_add_event(ngx_event_t *ev, int event, u_int flags)
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199 {
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200 #if (NGX_DEBUG)
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201 ngx_connection_t *c;
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202 #endif
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203
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204 #if (NGX_READ_EVENT != POLLIN)
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205 if (event == NGX_READ_EVENT) {
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206 event = POLLOUT;
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207 #if (NGX_WRITE_EVENT != POLLOUT)
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208 } else {
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209 event = POLLIN;
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210 #endif
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211 }
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212 #endif
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213
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214 #if (NGX_DEBUG)
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215 c = ev->data;
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216 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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217 "devpoll add event: fd:%d ev:%04X", c->fd, event);
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218 #endif
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219
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220 ev->active = 1;
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221 return ngx_devpoll_set_event(ev, event, 0);
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222 }
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223
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224
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225 static int ngx_devpoll_del_event(ngx_event_t *ev, int event, u_int flags)
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226 {
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227 ngx_event_t *e;
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228 ngx_connection_t *c;
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229
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230 c = ev->data;
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231
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232 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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233 "devpoll del event: fd:%d ev:%04X", c->fd, event);
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234
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235 if (ngx_devpoll_set_event(ev, POLLREMOVE, flags) == NGX_ERROR) {
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236 return NGX_ERROR;
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237 }
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238
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239 ev->active = 0;
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240
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241 if (flags & NGX_CLOSE_EVENT) {
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242 return NGX_OK;
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243 }
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244
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245 /* we need to restore the second event if it exists */
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246
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247 if (event == NGX_READ_EVENT) {
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248 if (ev->accept) {
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249 return NGX_OK;
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250 }
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251
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252 e = c->write;
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253 event = POLLOUT;
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254
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255 } else {
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256 e = c->read;
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257 event = POLLIN;
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258 }
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259
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260 if (e) {
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261 return ngx_devpoll_set_event(e, event, 0);
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262 }
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263
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264 return NGX_OK;
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265 }
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266
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267
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268 static int ngx_devpoll_set_event(ngx_event_t *ev, int event, u_int flags)
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269 {
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270 size_t n;
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271 ngx_connection_t *c;
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272
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273 c = ev->data;
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274
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275 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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276 "devpoll fd:%d ev:%d fl:%d", c->fd, event, flags);
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277
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278 if (nchanges >= max_changes) {
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279 ngx_log_error(NGX_LOG_WARN, ev->log, 0,
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280 "/dev/pool change list is filled up");
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281
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282 n = nchanges * sizeof(struct pollfd);
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283 if (write(dp, change_list, n) != (ssize_t) n) {
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284 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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285 "write(/dev/poll) failed");
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286 return NGX_ERROR;
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287 }
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288
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289 nchanges = 0;
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290 }
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291
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292 change_list[nchanges].fd = c->fd;
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293 change_list[nchanges].events = event;
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294 change_list[nchanges].revents = 0;
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295
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296 change_index[nchanges] = ev;
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297 ev->index = nchanges;
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298
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299 nchanges++;
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300
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301 if (flags & NGX_CLOSE_EVENT) {
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302 n = nchanges * sizeof(struct pollfd);
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303 if (write(dp, change_list, n) != (ssize_t) n) {
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304 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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305 "write(/dev/poll) failed");
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306 return NGX_ERROR;
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307 }
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308
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309 nchanges = 0;
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310 }
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311
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312 return NGX_OK;
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313 }
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314
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315
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316 int ngx_devpoll_process_events(ngx_cycle_t *cycle)
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317 {
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318 int events;
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319 ngx_int_t i;
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320 ngx_uint_t j, lock, accept_lock, expire;
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321 size_t n;
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322 ngx_msec_t timer;
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323 ngx_err_t err;
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324 ngx_cycle_t **old_cycle;
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325 ngx_event_t *rev, *wev;
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326 ngx_connection_t *c;
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327 ngx_epoch_msec_t delta;
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328 struct dvpoll dvp;
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329 struct timeval tv;
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330
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331 for ( ;; ) {
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332 timer = ngx_event_find_timer();
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333
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334 if (timer != 0) {
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335 break;
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336 }
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337
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338 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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339 "devpoll expired timer");
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340
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341 ngx_event_expire_timers((ngx_msec_t)
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342 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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343 }
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344
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345 /* NGX_TIMER_INFINITE == INFTIM */
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346
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347 if (timer == NGX_TIMER_INFINITE) {
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348 expire = 0;
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349
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350 } else {
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351 expire = 1;
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352 }
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353
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354 ngx_old_elapsed_msec = ngx_elapsed_msec;
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355 accept_lock = 0;
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356
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357 if (ngx_accept_mutex) {
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358 if (ngx_accept_disabled > 0) {
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359 ngx_accept_disabled--;
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360
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361 } else {
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362 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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363 return NGX_ERROR;
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364 }
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365
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366 if (ngx_accept_mutex_held) {
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367 accept_lock = 1;
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368
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369 } else if (timer == NGX_TIMER_INFINITE
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370 || timer > ngx_accept_mutex_delay)
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371 {
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372 timer = ngx_accept_mutex_delay;
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373 expire = 0;
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374 }
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375 }
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376 }
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377
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378 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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379 "devpoll timer: %d", timer);
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380
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381 if (nchanges) {
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382 n = nchanges * sizeof(struct pollfd);
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383 if (write(dp, change_list, n) != (ssize_t) n) {
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384 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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385 "write(/dev/poll) failed");
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386 ngx_accept_mutex_unlock();
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387 return NGX_ERROR;
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388 }
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389 }
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390
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391 dvp.dp_fds = event_list;
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392 dvp.dp_nfds = nevents;
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393 dvp.dp_timeout = timer;
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394 events = ioctl(dp, DP_POLL, &dvp);
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395
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396 if (events == -1) {
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397 err = ngx_errno;
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398 } else {
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399 err = 0;
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400 }
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401
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402 nchanges = 0;
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403
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404 ngx_gettimeofday(&tv);
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405 ngx_time_update(tv.tv_sec);
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406
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407 delta = ngx_elapsed_msec;
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408 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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409 + tv.tv_usec / 1000 - ngx_start_msec;
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410
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411 if (err) {
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412 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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413 cycle->log, err, "ioctl(DP_POLL) failed");
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414 ngx_accept_mutex_unlock();
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415 return NGX_ERROR;
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416 }
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417
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418 if (timer != NGX_TIMER_INFINITE) {
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419 delta = ngx_elapsed_msec - delta;
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420
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421 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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422 "devpoll timer: %d, delta: %d", timer, (int) delta);
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423 } else {
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424 if (events == 0) {
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425 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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426 "ioctl(DP_POLL) returned no events without timeout");
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427 ngx_accept_mutex_unlock();
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428 return NGX_ERROR;
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429 }
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430 }
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431
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432 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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433 ngx_accept_mutex_unlock();
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434 return NGX_ERROR;
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435 }
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436
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437 lock = 1;
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438
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439 for (i = 0; i < events; i++) {
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440 c = &ngx_cycle->connections[event_list[i].fd];
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441
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442 if (c->fd == -1) {
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443 old_cycle = ngx_old_cycles.elts;
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444 for (j = 0; j < ngx_old_cycles.nelts; j++) {
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445 if (old_cycle[j] == NULL) {
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446 continue;
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447 }
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448 c = &old_cycle[j]->connections[event_list[i].fd];
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449 if (c->fd != -1) {
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450 break;
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451 }
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452 }
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453 }
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454
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455 if (c->fd == -1) {
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456 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0, "unknown cycle");
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457 exit(1);
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458 }
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459
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460 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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461 "devpoll: fd:%d, ev:%04X, rev:%04X",
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462 event_list[i].fd,
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463 event_list[i].events, event_list[i].revents);
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464
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465 if (event_list[i].revents & (POLLERR|POLLHUP|POLLNVAL)) {
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466 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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467 "ioctl(DP_POLL) error fd:%d ev:%04X rev:%04X",
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468 event_list[i].fd,
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469 event_list[i].events, event_list[i].revents);
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470 }
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471
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472 if (event_list[i].revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL))
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473 {
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474 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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475 "strange ioctl(DP_POLL) events "
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476 "fd:%d ev:%04X rev:%04X",
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477 event_list[i].fd,
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478 event_list[i].events, event_list[i].revents);
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479 }
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480
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481 wev = c->write;
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482
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483 if ((event_list[i].events & (POLLOUT|POLLERR|POLLHUP)) && wev->active) {
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484 wev->ready = 1;
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485
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486 if (!ngx_threaded && !ngx_accept_mutex_held) {
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487 wev->event_handler(wev);
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488
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489 } else {
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490 ngx_post_event(wev);
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491 }
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492 }
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493
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494 /*
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495 * POLLIN must be handled after POLLOUT because we use
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496 * the optimization to avoid the unnecessary mutex locking/unlocking
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497 * if the accept event is the last one.
|
|
498 */
|
|
499
|
|
500 rev = c->read;
|
|
501
|
|
502 if ((event_list[i].events & (POLLIN|POLLERR|POLLHUP)) && rev->active) {
|
|
503 rev->ready = 1;
|
|
504
|
|
505 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
506 rev->event_handler(rev);
|
|
507
|
|
508 } else if (!rev->accept) {
|
|
509 ngx_post_event(rev);
|
|
510
|
|
511 } else if (ngx_accept_disabled <= 0) {
|
|
512 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
513
|
|
514 c->read->event_handler(rev);
|
|
515
|
|
516 if (ngx_accept_disabled > 0) {
|
|
517 ngx_accept_mutex_unlock();
|
|
518 accept_lock = 0;
|
|
519 }
|
|
520
|
|
521 if (i + 1 == events) {
|
|
522 lock = 0;
|
|
523 break;
|
|
524 }
|
|
525
|
|
526 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
527 if (accept_lock) {
|
|
528 ngx_accept_mutex_unlock();
|
|
529 }
|
|
530 return NGX_ERROR;
|
|
531 }
|
|
532 }
|
|
533 }
|
|
534 }
|
|
535
|
|
536 if (accept_lock) {
|
|
537 ngx_accept_mutex_unlock();
|
|
538 }
|
|
539
|
|
540 if (lock) {
|
|
541 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
542 }
|
|
543
|
|
544 if (expire && delta) {
|
|
545 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
546 }
|
|
547
|
|
548 if (!ngx_threaded) {
|
|
549 ngx_event_process_posted(cycle);
|
|
550 }
|
|
551
|
|
552 return NGX_OK;
|
|
553 }
|
|
554
|
|
555
|
|
556 static void *ngx_devpoll_create_conf(ngx_cycle_t *cycle)
|
|
557 {
|
|
558 ngx_devpoll_conf_t *dpcf;
|
|
559
|
|
560 ngx_test_null(dpcf, ngx_palloc(cycle->pool, sizeof(ngx_devpoll_conf_t)),
|
|
561 NGX_CONF_ERROR);
|
|
562
|
|
563 dpcf->changes = NGX_CONF_UNSET;
|
|
564 dpcf->events = NGX_CONF_UNSET;
|
|
565
|
|
566 return dpcf;
|
|
567 }
|
|
568
|
|
569
|
|
570 static char *ngx_devpoll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
571 {
|
|
572 ngx_devpoll_conf_t *dpcf = conf;
|
|
573
|
|
574 ngx_conf_init_unsigned_value(dpcf->changes, 512);
|
|
575 ngx_conf_init_unsigned_value(dpcf->events, 512);
|
|
576
|
|
577 return NGX_CONF_OK;
|
|
578 }
|