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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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48
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34 static ngx_int_t ngx_devpoll_init(ngx_cycle_t *cycle);
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0
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35 static void ngx_devpoll_done(ngx_cycle_t *cycle);
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48
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36 static ngx_int_t ngx_devpoll_add_event(ngx_event_t *ev, int event, u_int flags);
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37 static ngx_int_t ngx_devpoll_del_event(ngx_event_t *ev, int event, u_int flags);
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38 static ngx_int_t ngx_devpoll_set_event(ngx_event_t *ev, int event, u_int flags);
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39 static ngx_int_t ngx_devpoll_process_events(ngx_cycle_t *cycle);
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0
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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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48
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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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0
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61
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48
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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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0
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68
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48
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69 ngx_null_command
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0
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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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48
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103 static ngx_int_t
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104 ngx_devpoll_init(ngx_cycle_t *cycle)
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0
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105 {
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106 size_t n;
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107 ngx_devpoll_conf_t *dpcf;
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108
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109 dpcf = ngx_event_get_conf(cycle->conf_ctx, ngx_devpoll_module);
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110
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111 if (dp == -1) {
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112 dp = open("/dev/poll", O_RDWR);
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113
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114 if (dp == -1) {
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115 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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116 "open(/dev/poll) failed");
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117 return NGX_ERROR;
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118 }
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119 }
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120
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121 if (max_changes < dpcf->changes) {
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122 if (nchanges) {
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123 n = nchanges * sizeof(struct pollfd);
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124 if (write(dp, change_list, n) != (ssize_t) n) {
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125 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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126 "write(/dev/poll) failed");
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127 return NGX_ERROR;
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128 }
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129
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130 nchanges = 0;
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131 }
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132
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133 if (change_list) {
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134 ngx_free(change_list);
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135 }
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136
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137 ngx_test_null(change_list,
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138 ngx_alloc(sizeof(struct pollfd) * dpcf->changes,
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139 cycle->log),
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140 NGX_ERROR);
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141
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142 if (change_index) {
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143 ngx_free(change_index);
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144 }
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145
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146 ngx_test_null(change_index,
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147 ngx_alloc(sizeof(ngx_event_t *) * dpcf->changes,
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148 cycle->log),
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149 NGX_ERROR);
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150 }
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151
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152 max_changes = dpcf->changes;
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153
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154 if (nevents < dpcf->events) {
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155 if (event_list) {
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156 ngx_free(event_list);
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157 }
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158
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159 ngx_test_null(event_list,
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160 ngx_alloc(sizeof(struct pollfd) * dpcf->events,
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161 cycle->log),
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162 NGX_ERROR);
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163 }
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164
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165 nevents = dpcf->events;
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166
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167 ngx_io = ngx_os_io;
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168
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169 ngx_event_actions = ngx_devpoll_module_ctx.actions;
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170
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171 ngx_event_flags = NGX_USE_LEVEL_EVENT;
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172
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173 return NGX_OK;
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174 }
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175
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176
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48
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177 static void
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178 ngx_devpoll_done(ngx_cycle_t *cycle)
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0
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179 {
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180 if (close(dp) == -1) {
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181 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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182 "close(/dev/poll) failed");
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183 }
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184
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185 dp = -1;
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186
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187 ngx_free(change_list);
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188 ngx_free(event_list);
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189 ngx_free(change_index);
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190
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191 change_list = NULL;
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192 event_list = NULL;
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193 change_index = NULL;
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194 max_changes = 0;
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195 nchanges = 0;
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196 nevents = 0;
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197 }
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198
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199
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48
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200 static ngx_int_t
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201 ngx_devpoll_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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202 {
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203 #if (NGX_DEBUG)
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204 ngx_connection_t *c;
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205 #endif
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206
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207 #if (NGX_READ_EVENT != POLLIN)
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2
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208 event = (event == NGX_READ_EVENT) ? POLLIN : POLLOUT;
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0
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209 #endif
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210
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211 #if (NGX_DEBUG)
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212 c = ev->data;
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213 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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214 "devpoll add event: fd:%d ev:%04Xd", c->fd, event);
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0
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215 #endif
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216
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217 ev->active = 1;
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2
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218
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219 return ngx_devpoll_set_event(ev, event, 0);
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220 }
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221
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222
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48
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223 static ngx_int_t
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224 ngx_devpoll_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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225 {
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226 ngx_event_t *e;
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227 ngx_connection_t *c;
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228
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229 c = ev->data;
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230
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2
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231 #if (NGX_READ_EVENT != POLLIN)
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232 event = (event == NGX_READ_EVENT) ? POLLIN : POLLOUT;
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233 #endif
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234
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0
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235 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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236 "devpoll del event: fd:%d ev:%04Xd", c->fd, event);
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0
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237
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238 if (ngx_devpoll_set_event(ev, POLLREMOVE, flags) == NGX_ERROR) {
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239 return NGX_ERROR;
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240 }
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241
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242 ev->active = 0;
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243
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244 if (flags & NGX_CLOSE_EVENT) {
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245 return NGX_OK;
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246 }
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247
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2
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248 /* restore the paired event if it exists */
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0
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249
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2
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250 if (event == POLLIN) {
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0
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251 e = c->write;
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252 event = POLLOUT;
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253
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254 } else {
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255 e = c->read;
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256 event = POLLIN;
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257 }
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258
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2
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259 if (e && e->active) {
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0
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260 return ngx_devpoll_set_event(e, event, 0);
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261 }
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262
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263 return NGX_OK;
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264 }
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265
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266
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48
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267 static ngx_int_t
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268 ngx_devpoll_set_event(ngx_event_t *ev, int event, u_int flags)
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0
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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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10
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276 "devpoll fd:%d ev:%04Xd fl:%04Xd", c->fd, event, flags);
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0
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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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48
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316 ngx_int_t
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317 ngx_devpoll_process_events(ngx_cycle_t *cycle)
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0
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318 {
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32
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319 int events, revents;
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0
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320 ngx_int_t i;
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321 ngx_uint_t j, lock, accept_lock, expire;
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322 size_t n;
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323 ngx_msec_t timer;
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324 ngx_err_t err;
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325 ngx_cycle_t **old_cycle;
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326 ngx_event_t *rev, *wev;
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327 ngx_connection_t *c;
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328 ngx_epoch_msec_t delta;
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329 struct dvpoll dvp;
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330 struct timeval tv;
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331
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332 for ( ;; ) {
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333 timer = ngx_event_find_timer();
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334
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335 if (timer != 0) {
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336 break;
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337 }
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338
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339 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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340 "devpoll expired timer");
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341
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342 ngx_event_expire_timers((ngx_msec_t)
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343 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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344 }
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345
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346 /* NGX_TIMER_INFINITE == INFTIM */
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347
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348 if (timer == NGX_TIMER_INFINITE) {
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349 expire = 0;
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350
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351 } else {
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352 expire = 1;
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353 }
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354
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355 ngx_old_elapsed_msec = ngx_elapsed_msec;
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356 accept_lock = 0;
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357
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358 if (ngx_accept_mutex) {
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359 if (ngx_accept_disabled > 0) {
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360 ngx_accept_disabled--;
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361
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362 } else {
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363 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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364 return NGX_ERROR;
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365 }
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366
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367 if (ngx_accept_mutex_held) {
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368 accept_lock = 1;
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369
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370 } else if (timer == NGX_TIMER_INFINITE
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371 || timer > ngx_accept_mutex_delay)
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372 {
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373 timer = ngx_accept_mutex_delay;
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374 expire = 0;
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375 }
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376 }
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377 }
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378
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379 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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380 "devpoll timer: %d", timer);
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381
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382 if (nchanges) {
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383 n = nchanges * sizeof(struct pollfd);
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384 if (write(dp, change_list, n) != (ssize_t) n) {
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385 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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386 "write(/dev/poll) failed");
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387 ngx_accept_mutex_unlock();
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388 return NGX_ERROR;
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389 }
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390 }
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391
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392 dvp.dp_fds = event_list;
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393 dvp.dp_nfds = nevents;
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394 dvp.dp_timeout = timer;
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395 events = ioctl(dp, DP_POLL, &dvp);
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396
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397 if (events == -1) {
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398 err = ngx_errno;
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399 } else {
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400 err = 0;
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401 }
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402
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403 nchanges = 0;
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404
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405 ngx_gettimeofday(&tv);
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406 ngx_time_update(tv.tv_sec);
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407
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408 delta = ngx_elapsed_msec;
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409 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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410 + tv.tv_usec / 1000 - ngx_start_msec;
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411
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412 if (err) {
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413 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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414 cycle->log, err, "ioctl(DP_POLL) failed");
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415 ngx_accept_mutex_unlock();
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416 return NGX_ERROR;
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417 }
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418
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|
419 if (timer != NGX_TIMER_INFINITE) {
|
|
|
420 delta = ngx_elapsed_msec - delta;
|
|
|
421
|
|
|
422 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
423 "devpoll timer: %d, delta: %d", timer, (int) delta);
|
|
|
424 } else {
|
|
|
425 if (events == 0) {
|
|
|
426 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
427 "ioctl(DP_POLL) returned no events without timeout");
|
|
|
428 ngx_accept_mutex_unlock();
|
|
|
429 return NGX_ERROR;
|
|
|
430 }
|
|
|
431 }
|
|
|
432
|
|
|
433 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
434 ngx_accept_mutex_unlock();
|
|
|
435 return NGX_ERROR;
|
|
|
436 }
|
|
|
437
|
|
|
438 lock = 1;
|
|
|
439
|
|
|
440 for (i = 0; i < events; i++) {
|
|
|
441 c = &ngx_cycle->connections[event_list[i].fd];
|
|
|
442
|
|
|
443 if (c->fd == -1) {
|
|
22
|
444 if (ngx_cycle->read_events[event_list[i].fd].closed) {
|
|
|
445 continue;
|
|
|
446 }
|
|
|
447
|
|
|
448 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
|
|
|
449 continue;
|
|
|
450 }
|
|
|
451
|
|
|
452 #if 0
|
|
|
453 if (c->fd == -1) {
|
|
0
|
454 old_cycle = ngx_old_cycles.elts;
|
|
|
455 for (j = 0; j < ngx_old_cycles.nelts; j++) {
|
|
|
456 if (old_cycle[j] == NULL) {
|
|
|
457 continue;
|
|
|
458 }
|
|
|
459 c = &old_cycle[j]->connections[event_list[i].fd];
|
|
|
460 if (c->fd != -1) {
|
|
|
461 break;
|
|
|
462 }
|
|
|
463 }
|
|
|
464 }
|
|
|
465
|
|
|
466 if (c->fd == -1) {
|
|
|
467 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0, "unknown cycle");
|
|
|
468 exit(1);
|
|
|
469 }
|
|
22
|
470 #endif
|
|
0
|
471
|
|
32
|
472 revents = event_list[i].revents;
|
|
|
473
|
|
0
|
474 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
475 "devpoll: fd:%d, ev:%04Xd, rev:%04Xd",
|
|
32
|
476 event_list[i].fd, event_list[i].events, revents);
|
|
0
|
477
|
|
32
|
478 if (revents & (POLLERR|POLLHUP|POLLNVAL)) {
|
|
0
|
479 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
10
|
480 "ioctl(DP_POLL) error fd:%d ev:%04Xd rev:%04Xd",
|
|
32
|
481 event_list[i].fd, event_list[i].events, revents);
|
|
0
|
482 }
|
|
|
483
|
|
32
|
484 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
|
|
0
|
485 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
486 "strange ioctl(DP_POLL) events "
|
|
10
|
487 "fd:%d ev:%04Xd rev:%04Xd",
|
|
32
|
488 event_list[i].fd, event_list[i].events, revents);
|
|
|
489 }
|
|
|
490
|
|
|
491 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
|
|
|
492 && (revents & (POLLIN|POLLOUT)) == 0)
|
|
|
493 {
|
|
|
494 /*
|
|
|
495 * if the error events were returned without POLLIN or POLLOUT,
|
|
|
496 * then add these flags to handle the events at least in one
|
|
|
497 * active handler
|
|
|
498 */
|
|
|
499
|
|
|
500 revents |= POLLIN|POLLOUT;
|
|
0
|
501 }
|
|
|
502
|
|
|
503 wev = c->write;
|
|
|
504
|
|
32
|
505 if ((revents & POLLOUT) && wev->active) {
|
|
0
|
506 wev->ready = 1;
|
|
|
507
|
|
|
508 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
|
509 wev->event_handler(wev);
|
|
|
510
|
|
|
511 } else {
|
|
|
512 ngx_post_event(wev);
|
|
|
513 }
|
|
|
514 }
|
|
|
515
|
|
|
516 /*
|
|
|
517 * POLLIN must be handled after POLLOUT because we use
|
|
|
518 * the optimization to avoid the unnecessary mutex locking/unlocking
|
|
|
519 * if the accept event is the last one.
|
|
|
520 */
|
|
|
521
|
|
|
522 rev = c->read;
|
|
|
523
|
|
32
|
524 if ((revents & POLLIN) && rev->active) {
|
|
0
|
525 rev->ready = 1;
|
|
|
526
|
|
|
527 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
|
528 rev->event_handler(rev);
|
|
|
529
|
|
|
530 } else if (!rev->accept) {
|
|
|
531 ngx_post_event(rev);
|
|
|
532
|
|
|
533 } else if (ngx_accept_disabled <= 0) {
|
|
|
534 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
535
|
|
|
536 c->read->event_handler(rev);
|
|
|
537
|
|
|
538 if (ngx_accept_disabled > 0) {
|
|
|
539 ngx_accept_mutex_unlock();
|
|
|
540 accept_lock = 0;
|
|
|
541 }
|
|
|
542
|
|
|
543 if (i + 1 == events) {
|
|
|
544 lock = 0;
|
|
|
545 break;
|
|
|
546 }
|
|
|
547
|
|
|
548 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
549 if (accept_lock) {
|
|
|
550 ngx_accept_mutex_unlock();
|
|
|
551 }
|
|
|
552 return NGX_ERROR;
|
|
|
553 }
|
|
|
554 }
|
|
|
555 }
|
|
|
556 }
|
|
|
557
|
|
|
558 if (accept_lock) {
|
|
|
559 ngx_accept_mutex_unlock();
|
|
|
560 }
|
|
|
561
|
|
|
562 if (lock) {
|
|
|
563 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
564 }
|
|
|
565
|
|
|
566 if (expire && delta) {
|
|
|
567 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
|
568 }
|
|
|
569
|
|
|
570 if (!ngx_threaded) {
|
|
|
571 ngx_event_process_posted(cycle);
|
|
|
572 }
|
|
|
573
|
|
|
574 return NGX_OK;
|
|
|
575 }
|
|
|
576
|
|
|
577
|
|
48
|
578 static void *
|
|
|
579 ngx_devpoll_create_conf(ngx_cycle_t *cycle)
|
|
0
|
580 {
|
|
|
581 ngx_devpoll_conf_t *dpcf;
|
|
|
582
|
|
|
583 ngx_test_null(dpcf, ngx_palloc(cycle->pool, sizeof(ngx_devpoll_conf_t)),
|
|
|
584 NGX_CONF_ERROR);
|
|
|
585
|
|
|
586 dpcf->changes = NGX_CONF_UNSET;
|
|
|
587 dpcf->events = NGX_CONF_UNSET;
|
|
|
588
|
|
|
589 return dpcf;
|
|
|
590 }
|
|
|
591
|
|
|
592
|
|
48
|
593 static char *
|
|
|
594 ngx_devpoll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
595 {
|
|
|
596 ngx_devpoll_conf_t *dpcf = conf;
|
|
|
597
|
|
36
|
598 ngx_conf_init_unsigned_value(dpcf->changes, 32);
|
|
|
599 ngx_conf_init_unsigned_value(dpcf->events, 32);
|
|
0
|
600
|
|
|
601 return NGX_CONF_OK;
|
|
|
602 }
|
