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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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18
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12 #if (NGX_TEST_BUILD_DEVPOLL)
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0
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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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2
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205 event = (event == NGX_READ_EVENT) ? POLLIN : POLLOUT;
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0
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206 #endif
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207
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208 #if (NGX_DEBUG)
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209 c = ev->data;
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210 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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211 "devpoll add event: fd:%d ev:%04Xd", c->fd, event);
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0
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212 #endif
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213
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214 ev->active = 1;
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2
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215
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216 return ngx_devpoll_set_event(ev, event, 0);
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217 }
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218
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219
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220 static int ngx_devpoll_del_event(ngx_event_t *ev, int event, u_int flags)
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221 {
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222 ngx_event_t *e;
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223 ngx_connection_t *c;
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224
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225 c = ev->data;
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226
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2
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227 #if (NGX_READ_EVENT != POLLIN)
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228 event = (event == NGX_READ_EVENT) ? POLLIN : POLLOUT;
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229 #endif
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230
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0
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231 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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232 "devpoll del event: fd:%d ev:%04Xd", c->fd, event);
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0
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233
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234 if (ngx_devpoll_set_event(ev, POLLREMOVE, flags) == NGX_ERROR) {
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235 return NGX_ERROR;
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236 }
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237
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238 ev->active = 0;
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239
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240 if (flags & NGX_CLOSE_EVENT) {
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241 return NGX_OK;
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242 }
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243
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2
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244 /* restore the paired event if it exists */
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0
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245
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2
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246 if (event == POLLIN) {
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0
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247 e = c->write;
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248 event = POLLOUT;
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249
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250 } else {
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251 e = c->read;
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252 event = POLLIN;
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253 }
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254
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2
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255 if (e && e->active) {
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0
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256 return ngx_devpoll_set_event(e, event, 0);
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257 }
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258
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259 return NGX_OK;
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260 }
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261
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262
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263 static int ngx_devpoll_set_event(ngx_event_t *ev, int event, u_int flags)
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264 {
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265 size_t n;
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266 ngx_connection_t *c;
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267
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268 c = ev->data;
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269
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270 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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271 "devpoll fd:%d ev:%04Xd fl:%04Xd", c->fd, event, flags);
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0
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272
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273 if (nchanges >= max_changes) {
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274 ngx_log_error(NGX_LOG_WARN, ev->log, 0,
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275 "/dev/pool change list is filled up");
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276
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277 n = nchanges * sizeof(struct pollfd);
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278 if (write(dp, change_list, n) != (ssize_t) n) {
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279 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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280 "write(/dev/poll) failed");
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281 return NGX_ERROR;
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282 }
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283
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284 nchanges = 0;
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285 }
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286
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287 change_list[nchanges].fd = c->fd;
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288 change_list[nchanges].events = event;
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289 change_list[nchanges].revents = 0;
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290
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291 change_index[nchanges] = ev;
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292 ev->index = nchanges;
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293
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294 nchanges++;
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295
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296 if (flags & NGX_CLOSE_EVENT) {
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297 n = nchanges * sizeof(struct pollfd);
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298 if (write(dp, change_list, n) != (ssize_t) n) {
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299 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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300 "write(/dev/poll) failed");
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301 return NGX_ERROR;
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302 }
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303
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304 nchanges = 0;
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305 }
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306
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307 return NGX_OK;
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308 }
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309
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310
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311 int ngx_devpoll_process_events(ngx_cycle_t *cycle)
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312 {
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32
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313 int events, revents;
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0
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314 ngx_int_t i;
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315 ngx_uint_t j, lock, accept_lock, expire;
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316 size_t n;
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317 ngx_msec_t timer;
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318 ngx_err_t err;
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319 ngx_cycle_t **old_cycle;
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320 ngx_event_t *rev, *wev;
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321 ngx_connection_t *c;
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322 ngx_epoch_msec_t delta;
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323 struct dvpoll dvp;
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324 struct timeval tv;
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325
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326 for ( ;; ) {
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327 timer = ngx_event_find_timer();
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328
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329 if (timer != 0) {
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330 break;
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331 }
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332
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333 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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334 "devpoll expired timer");
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335
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336 ngx_event_expire_timers((ngx_msec_t)
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337 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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338 }
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339
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340 /* NGX_TIMER_INFINITE == INFTIM */
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341
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342 if (timer == NGX_TIMER_INFINITE) {
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343 expire = 0;
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344
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345 } else {
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346 expire = 1;
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347 }
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348
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349 ngx_old_elapsed_msec = ngx_elapsed_msec;
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350 accept_lock = 0;
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351
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352 if (ngx_accept_mutex) {
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353 if (ngx_accept_disabled > 0) {
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354 ngx_accept_disabled--;
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355
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356 } else {
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357 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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358 return NGX_ERROR;
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359 }
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360
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361 if (ngx_accept_mutex_held) {
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362 accept_lock = 1;
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363
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364 } else if (timer == NGX_TIMER_INFINITE
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365 || timer > ngx_accept_mutex_delay)
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366 {
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367 timer = ngx_accept_mutex_delay;
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368 expire = 0;
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369 }
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370 }
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371 }
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372
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373 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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374 "devpoll timer: %d", timer);
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375
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376 if (nchanges) {
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377 n = nchanges * sizeof(struct pollfd);
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378 if (write(dp, change_list, n) != (ssize_t) n) {
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379 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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380 "write(/dev/poll) failed");
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381 ngx_accept_mutex_unlock();
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382 return NGX_ERROR;
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383 }
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384 }
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385
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386 dvp.dp_fds = event_list;
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387 dvp.dp_nfds = nevents;
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388 dvp.dp_timeout = timer;
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389 events = ioctl(dp, DP_POLL, &dvp);
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390
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391 if (events == -1) {
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392 err = ngx_errno;
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393 } else {
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394 err = 0;
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395 }
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396
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397 nchanges = 0;
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398
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399 ngx_gettimeofday(&tv);
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400 ngx_time_update(tv.tv_sec);
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401
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402 delta = ngx_elapsed_msec;
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403 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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404 + tv.tv_usec / 1000 - ngx_start_msec;
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405
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406 if (err) {
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407 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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408 cycle->log, err, "ioctl(DP_POLL) failed");
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409 ngx_accept_mutex_unlock();
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410 return NGX_ERROR;
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411 }
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412
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413 if (timer != NGX_TIMER_INFINITE) {
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414 delta = ngx_elapsed_msec - delta;
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415
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416 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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417 "devpoll timer: %d, delta: %d", timer, (int) delta);
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418 } else {
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419 if (events == 0) {
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420 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
421 "ioctl(DP_POLL) returned no events without timeout");
|
|
|
422 ngx_accept_mutex_unlock();
|
|
|
423 return NGX_ERROR;
|
|
|
424 }
|
|
|
425 }
|
|
|
426
|
|
|
427 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
428 ngx_accept_mutex_unlock();
|
|
|
429 return NGX_ERROR;
|
|
|
430 }
|
|
|
431
|
|
|
432 lock = 1;
|
|
|
433
|
|
|
434 for (i = 0; i < events; i++) {
|
|
|
435 c = &ngx_cycle->connections[event_list[i].fd];
|
|
|
436
|
|
|
437 if (c->fd == -1) {
|
|
22
|
438 if (ngx_cycle->read_events[event_list[i].fd].closed) {
|
|
|
439 continue;
|
|
|
440 }
|
|
|
441
|
|
|
442 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
|
|
|
443 continue;
|
|
|
444 }
|
|
|
445
|
|
|
446 #if 0
|
|
|
447 if (c->fd == -1) {
|
|
0
|
448 old_cycle = ngx_old_cycles.elts;
|
|
|
449 for (j = 0; j < ngx_old_cycles.nelts; j++) {
|
|
|
450 if (old_cycle[j] == NULL) {
|
|
|
451 continue;
|
|
|
452 }
|
|
|
453 c = &old_cycle[j]->connections[event_list[i].fd];
|
|
|
454 if (c->fd != -1) {
|
|
|
455 break;
|
|
|
456 }
|
|
|
457 }
|
|
|
458 }
|
|
|
459
|
|
|
460 if (c->fd == -1) {
|
|
|
461 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0, "unknown cycle");
|
|
|
462 exit(1);
|
|
|
463 }
|
|
22
|
464 #endif
|
|
0
|
465
|
|
32
|
466 revents = event_list[i].revents;
|
|
|
467
|
|
0
|
468 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
469 "devpoll: fd:%d, ev:%04Xd, rev:%04Xd",
|
|
32
|
470 event_list[i].fd, event_list[i].events, revents);
|
|
0
|
471
|
|
32
|
472 if (revents & (POLLERR|POLLHUP|POLLNVAL)) {
|
|
0
|
473 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
10
|
474 "ioctl(DP_POLL) error fd:%d ev:%04Xd rev:%04Xd",
|
|
32
|
475 event_list[i].fd, event_list[i].events, revents);
|
|
0
|
476 }
|
|
|
477
|
|
32
|
478 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
|
|
0
|
479 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
480 "strange ioctl(DP_POLL) events "
|
|
10
|
481 "fd:%d ev:%04Xd rev:%04Xd",
|
|
32
|
482 event_list[i].fd, event_list[i].events, revents);
|
|
|
483 }
|
|
|
484
|
|
|
485 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
|
|
|
486 && (revents & (POLLIN|POLLOUT)) == 0)
|
|
|
487 {
|
|
|
488 /*
|
|
|
489 * if the error events were returned without POLLIN or POLLOUT,
|
|
|
490 * then add these flags to handle the events at least in one
|
|
|
491 * active handler
|
|
|
492 */
|
|
|
493
|
|
|
494 revents |= POLLIN|POLLOUT;
|
|
0
|
495 }
|
|
|
496
|
|
|
497 wev = c->write;
|
|
|
498
|
|
32
|
499 if ((revents & POLLOUT) && wev->active) {
|
|
0
|
500 wev->ready = 1;
|
|
|
501
|
|
|
502 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
|
503 wev->event_handler(wev);
|
|
|
504
|
|
|
505 } else {
|
|
|
506 ngx_post_event(wev);
|
|
|
507 }
|
|
|
508 }
|
|
|
509
|
|
|
510 /*
|
|
|
511 * POLLIN must be handled after POLLOUT because we use
|
|
|
512 * the optimization to avoid the unnecessary mutex locking/unlocking
|
|
|
513 * if the accept event is the last one.
|
|
|
514 */
|
|
|
515
|
|
|
516 rev = c->read;
|
|
|
517
|
|
32
|
518 if ((revents & POLLIN) && rev->active) {
|
|
0
|
519 rev->ready = 1;
|
|
|
520
|
|
|
521 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
|
522 rev->event_handler(rev);
|
|
|
523
|
|
|
524 } else if (!rev->accept) {
|
|
|
525 ngx_post_event(rev);
|
|
|
526
|
|
|
527 } else if (ngx_accept_disabled <= 0) {
|
|
|
528 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
529
|
|
|
530 c->read->event_handler(rev);
|
|
|
531
|
|
|
532 if (ngx_accept_disabled > 0) {
|
|
|
533 ngx_accept_mutex_unlock();
|
|
|
534 accept_lock = 0;
|
|
|
535 }
|
|
|
536
|
|
|
537 if (i + 1 == events) {
|
|
|
538 lock = 0;
|
|
|
539 break;
|
|
|
540 }
|
|
|
541
|
|
|
542 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
543 if (accept_lock) {
|
|
|
544 ngx_accept_mutex_unlock();
|
|
|
545 }
|
|
|
546 return NGX_ERROR;
|
|
|
547 }
|
|
|
548 }
|
|
|
549 }
|
|
|
550 }
|
|
|
551
|
|
|
552 if (accept_lock) {
|
|
|
553 ngx_accept_mutex_unlock();
|
|
|
554 }
|
|
|
555
|
|
|
556 if (lock) {
|
|
|
557 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
558 }
|
|
|
559
|
|
|
560 if (expire && delta) {
|
|
|
561 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
|
562 }
|
|
|
563
|
|
|
564 if (!ngx_threaded) {
|
|
|
565 ngx_event_process_posted(cycle);
|
|
|
566 }
|
|
|
567
|
|
|
568 return NGX_OK;
|
|
|
569 }
|
|
|
570
|
|
|
571
|
|
|
572 static void *ngx_devpoll_create_conf(ngx_cycle_t *cycle)
|
|
|
573 {
|
|
|
574 ngx_devpoll_conf_t *dpcf;
|
|
|
575
|
|
|
576 ngx_test_null(dpcf, ngx_palloc(cycle->pool, sizeof(ngx_devpoll_conf_t)),
|
|
|
577 NGX_CONF_ERROR);
|
|
|
578
|
|
|
579 dpcf->changes = NGX_CONF_UNSET;
|
|
|
580 dpcf->events = NGX_CONF_UNSET;
|
|
|
581
|
|
|
582 return dpcf;
|
|
|
583 }
|
|
|
584
|
|
|
585
|
|
|
586 static char *ngx_devpoll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
|
587 {
|
|
|
588 ngx_devpoll_conf_t *dpcf = conf;
|
|
|
589
|
|
|
590 ngx_conf_init_unsigned_value(dpcf->changes, 512);
|
|
|
591 ngx_conf_init_unsigned_value(dpcf->events, 512);
|
|
|
592
|
|
|
593 return NGX_CONF_OK;
|
|
|
594 }
|
