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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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112
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12 static ngx_int_t ngx_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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0
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13 static void ngx_poll_done(ngx_cycle_t *cycle);
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14 static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags);
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15 static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags);
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112
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16 static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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17 ngx_uint_t flags);
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0
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18 static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf);
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19
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20
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21 static struct pollfd *event_list;
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22 static int nevents;
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23
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24
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25 static ngx_str_t poll_name = ngx_string("poll");
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26
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27 ngx_event_module_t ngx_poll_module_ctx = {
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28 &poll_name,
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29 NULL, /* create configuration */
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30 ngx_poll_init_conf, /* init configuration */
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31
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32 {
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33 ngx_poll_add_event, /* add an event */
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34 ngx_poll_del_event, /* delete an event */
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35 ngx_poll_add_event, /* enable an event */
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36 ngx_poll_del_event, /* disable an event */
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37 NULL, /* add an connection */
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38 NULL, /* delete an connection */
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39 NULL, /* process the changes */
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40 ngx_poll_process_events, /* process the events */
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41 ngx_poll_init, /* init the events */
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42 ngx_poll_done /* done the events */
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43 }
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44
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45 };
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46
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47 ngx_module_t ngx_poll_module = {
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58
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48 NGX_MODULE_V1,
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0
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49 &ngx_poll_module_ctx, /* module context */
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50 NULL, /* module directives */
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51 NGX_EVENT_MODULE, /* module type */
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90
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52 NULL, /* init master */
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0
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53 NULL, /* init module */
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90
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54 NULL, /* init process */
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55 NULL, /* init thread */
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56 NULL, /* exit thread */
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57 NULL, /* exit process */
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58 NULL, /* exit master */
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59 NGX_MODULE_V1_PADDING
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0
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60 };
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61
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62
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63
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48
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64 static ngx_int_t
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112
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65 ngx_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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0
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66 {
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67 struct pollfd *list;
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68
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69 if (event_list == NULL) {
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70 nevents = 0;
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71 }
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72
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73 if (ngx_process == NGX_PROCESS_WORKER
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74 || cycle->old_cycle == NULL
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75 || cycle->old_cycle->connection_n < cycle->connection_n)
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76 {
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50
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77 list = ngx_alloc(sizeof(struct pollfd) * cycle->connection_n,
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78 cycle->log);
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79 if (list == NULL) {
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80 return NGX_ERROR;
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81 }
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0
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82
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83 if (event_list) {
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84 ngx_memcpy(list, event_list, sizeof(ngx_event_t *) * nevents);
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85 ngx_free(event_list);
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86 }
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87
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88 event_list = list;
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89 }
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90
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91 ngx_io = ngx_os_io;
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92
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93 ngx_event_actions = ngx_poll_module_ctx.actions;
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94
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112
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95 ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_FD_EVENT;
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0
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96
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97 return NGX_OK;
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98 }
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99
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100
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48
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101 static void
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102 ngx_poll_done(ngx_cycle_t *cycle)
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0
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103 {
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104 ngx_free(event_list);
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105
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106 event_list = NULL;
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107 }
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108
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109
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48
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110 static ngx_int_t
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111 ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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112 {
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113 ngx_event_t *e;
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114 ngx_connection_t *c;
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115
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116 c = ev->data;
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117
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118 ev->active = 1;
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119
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120 if (ev->index != NGX_INVALID_INDEX) {
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121 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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122 "poll event fd:%d ev:%d is already set", c->fd, event);
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123 return NGX_OK;
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124 }
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125
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126 if (event == NGX_READ_EVENT) {
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127 e = c->write;
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128 #if (NGX_READ_EVENT != POLLIN)
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129 event = POLLIN;
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130 #endif
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131
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132 } else {
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133 e = c->read;
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134 #if (NGX_WRITE_EVENT != POLLOUT)
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135 event = POLLOUT;
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136 #endif
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137 }
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138
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139 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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140 "poll add event: fd:%d ev:%d", c->fd, event);
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141
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142 if (e == NULL || e->index == NGX_INVALID_INDEX) {
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143 event_list[nevents].fd = c->fd;
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144 event_list[nevents].events = event;
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145 event_list[nevents].revents = 0;
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146
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147 ev->index = nevents;
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148 nevents++;
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149
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150 } else {
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151 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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152 "poll add index: %d", e->index);
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153
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154 event_list[e->index].events |= event;
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155 ev->index = e->index;
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156 }
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157
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158 return NGX_OK;
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159 }
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160
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161
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48
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162 static ngx_int_t
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163 ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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164 {
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112
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165 ngx_event_t *e;
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166 ngx_connection_t *c;
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0
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167
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168 c = ev->data;
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169
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170 ev->active = 0;
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171
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172 if (ev->index == NGX_INVALID_INDEX) {
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173 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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174 "poll event fd:%d ev:%d is already deleted",
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175 c->fd, event);
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176 return NGX_OK;
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177 }
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178
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179 if (event == NGX_READ_EVENT) {
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180 e = c->write;
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181 #if (NGX_READ_EVENT != POLLIN)
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182 event = POLLIN;
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183 #endif
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184
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185 } else {
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186 e = c->read;
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187 #if (NGX_WRITE_EVENT != POLLOUT)
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188 event = POLLOUT;
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189 #endif
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190 }
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191
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192 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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193 "poll del event: fd:%d ev:%d", c->fd, event);
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194
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195 if (e == NULL || e->index == NGX_INVALID_INDEX) {
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196 nevents--;
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197
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198 if (ev->index < (u_int) nevents) {
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199
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200 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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201 "index: copy event %d to %d", nevents, ev->index);
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202
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203 event_list[ev->index] = event_list[nevents];
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204
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92
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205 c = ngx_cycle->files[event_list[nevents].fd];
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0
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206
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207 if (c->fd == -1) {
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208 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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209 "unexpected last event");
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210
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211 } else {
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212 if (c->read->index == (u_int) nevents) {
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213 c->read->index = ev->index;
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214 }
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215
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216 if (c->write->index == (u_int) nevents) {
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217 c->write->index = ev->index;
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218 }
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219 }
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220 }
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221
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222 } else {
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223 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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224 "poll del index: %d", e->index);
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225
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226 event_list[e->index].events &= ~event;
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227 }
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228
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229 ev->index = NGX_INVALID_INDEX;
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230
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231 return NGX_OK;
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232 }
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233
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234
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48
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235 static ngx_int_t
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112
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236 ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
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0
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237 {
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32
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238 int ready, revents;
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106
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239 ngx_err_t err;
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0
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240 ngx_int_t i, nready;
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112
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241 ngx_uint_t found, level;
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242 ngx_event_t *ev, **queue;
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0
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243 ngx_connection_t *c;
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244
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245 /* NGX_TIMER_INFINITE == INFTIM */
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246
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247 #if (NGX_DEBUG0)
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248 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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249 for (i = 0; i < nevents; i++) {
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250 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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251 "poll: %d: fd:%d ev:%04Xd",
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0
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252 i, event_list[i].fd, event_list[i].events);
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253 }
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254 }
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255 #endif
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256
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106
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257 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %M", timer);
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0
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258
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259 ready = poll(event_list, (u_int) nevents, (int) timer);
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260
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261 if (ready == -1) {
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262 err = ngx_errno;
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263 } else {
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264 err = 0;
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265 }
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266
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112
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267 if (flags & NGX_UPDATE_TIME) {
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268 ngx_time_update(0, 0);
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269 }
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0
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270
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271 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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272 "poll ready %d of %d", ready, nevents);
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273
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274 if (err) {
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112
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275 if (err == NGX_EINTR) {
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276
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277 if (ngx_event_timer_alarm) {
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278 ngx_event_timer_alarm = 0;
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279 return NGX_OK;
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280 }
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126
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281
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112
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282 level = NGX_LOG_INFO;
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126
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283
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284 } else {
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112
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285 level = NGX_LOG_ALERT;
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286 }
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287
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288 ngx_log_error(level, cycle->log, err, "poll() failed");
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0
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289 return NGX_ERROR;
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290 }
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291
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116
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292 if (ready == 0) {
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293 if (timer != NGX_TIMER_INFINITE) {
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294 return NGX_OK;
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295 }
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0
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296
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116
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297 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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298 "poll() returned no events without timeout");
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299 return NGX_ERROR;
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0
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300 }
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301
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112
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302 ngx_mutex_lock(ngx_posted_events_mutex);
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303
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0
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304 nready = 0;
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305
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306 for (i = 0; i < nevents && ready; i++) {
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307
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32
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308 revents = event_list[i].revents;
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309
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112
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310 #if 1
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0
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311 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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312 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
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32
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313 i, event_list[i].fd, event_list[i].events, revents);
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0
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314 #else
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32
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315 if (revents) {
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0
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316 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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317 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
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32
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318 i, event_list[i].fd, event_list[i].events, revents);
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0
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319 }
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320 #endif
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321
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32
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322 if (revents & POLLNVAL) {
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0
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323 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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10
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324 "poll() error fd:%d ev:%04Xd rev:%04Xd",
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32
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325 event_list[i].fd, event_list[i].events, revents);
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0
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326 }
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327
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32
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328 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
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0
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329 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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10
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330 "strange poll() events fd:%d ev:%04Xd rev:%04Xd",
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32
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331 event_list[i].fd, event_list[i].events, revents);
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0
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332 }
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333
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334 if (event_list[i].fd == -1) {
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335 /*
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336 * the disabled event, a workaround for our possible bug,
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337 * see the comment below
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338 */
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339 continue;
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340 }
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341
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92
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342 c = ngx_cycle->files[event_list[i].fd];
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0
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343
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344 if (c->fd == -1) {
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345 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
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346
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347 /*
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348 * it is certainly our fault and it should be investigated,
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349 * in the meantime we disable this event to avoid a CPU spinning
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350 */
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351
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352 if (i == nevents - 1) {
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353 nevents--;
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354 } else {
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355 event_list[i].fd = -1;
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356 }
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357
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358 continue;
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359 }
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360
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32
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361 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
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362 && (revents & (POLLIN|POLLOUT)) == 0)
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363 {
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364 /*
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365 * if the error events were returned without POLLIN or POLLOUT,
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366 * then add these flags to handle the events at least in one
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367 * active handler
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368 */
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369
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370 revents |= POLLIN|POLLOUT;
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371 }
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372
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0
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373 found = 0;
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374
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32
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375 if (revents & POLLIN) {
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0
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376 found = 1;
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377
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378 ev = c->read;
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379
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112
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380 if ((flags & NGX_POST_THREAD_EVENTS) && !ev->accept) {
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381 ev->posted_ready = 1;
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382
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383 } else {
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384 ev->ready = 1;
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0
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385 }
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386
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112
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387 queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
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388 &ngx_posted_events);
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126
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389 ngx_locked_post_event(ev, queue);
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0
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390 }
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391
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32
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392 if (revents & POLLOUT) {
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0
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393 found = 1;
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394 ev = c->write;
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395
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112
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396 if (flags & NGX_POST_THREAD_EVENTS) {
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397 ev->posted_ready = 1;
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398
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399 } else {
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400 ev->ready = 1;
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0
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401 }
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402
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112
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403 ngx_locked_post_event(ev, &ngx_posted_events);
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0
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404 }
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405
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406 if (found) {
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407 ready--;
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408 continue;
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409 }
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410 }
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411
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|
112
|
412 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
0
|
413
|
|
|
414 if (ready != 0) {
|
|
|
415 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events");
|
|
|
416 }
|
|
|
417
|
|
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418 return nready;
|
|
|
419 }
|
|
|
420
|
|
|
421
|
|
48
|
422 static char *
|
|
|
423 ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
424 {
|
|
|
425 ngx_event_conf_t *ecf;
|
|
|
426
|
|
|
427 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
|
428
|
|
|
429 if (ecf->use != ngx_poll_module.ctx_index) {
|
|
|
430 return NGX_CONF_OK;
|
|
|
431 }
|
|
|
432
|
|
|
433 #if (NGX_THREADS)
|
|
|
434
|
|
|
435 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
436 "poll() is not supported in the threaded mode");
|
|
|
437 return NGX_CONF_ERROR;
|
|
|
438
|
|
|
439 #else
|
|
|
440
|
|
|
441 return NGX_CONF_OK;
|
|
|
442
|
|
|
443 #endif
|
|
|
444 }
|
