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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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58
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94 NGX_MODULE_V1,
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0
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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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90
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98 NULL, /* init master */
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0
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99 NULL, /* init module */
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90
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100 NULL, /* init process */
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101 NULL, /* init thread */
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102 NULL, /* exit thread */
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103 NULL, /* exit process */
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104 NULL, /* exit master */
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105 NGX_MODULE_V1_PADDING
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0
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106 };
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107
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108
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48
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109 static ngx_int_t
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110 ngx_devpoll_init(ngx_cycle_t *cycle)
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0
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111 {
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112 size_t n;
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113 ngx_devpoll_conf_t *dpcf;
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114
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115 dpcf = ngx_event_get_conf(cycle->conf_ctx, ngx_devpoll_module);
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116
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117 if (dp == -1) {
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118 dp = open("/dev/poll", O_RDWR);
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119
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120 if (dp == -1) {
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121 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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122 "open(/dev/poll) failed");
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123 return NGX_ERROR;
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124 }
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125 }
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126
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127 if (max_changes < dpcf->changes) {
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128 if (nchanges) {
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129 n = nchanges * sizeof(struct pollfd);
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130 if (write(dp, change_list, n) != (ssize_t) n) {
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131 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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132 "write(/dev/poll) failed");
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133 return NGX_ERROR;
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134 }
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135
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136 nchanges = 0;
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137 }
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138
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139 if (change_list) {
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140 ngx_free(change_list);
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141 }
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142
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50
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143 change_list = ngx_alloc(sizeof(struct pollfd) * dpcf->changes,
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144 cycle->log);
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145 if (change_list == NULL) {
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146 return NGX_ERROR;
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147 }
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0
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148
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149 if (change_index) {
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150 ngx_free(change_index);
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151 }
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152
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50
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153 change_index = ngx_alloc(sizeof(ngx_event_t *) * dpcf->changes,
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154 cycle->log);
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155 if (change_index == NULL) {
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156 return NGX_ERROR;
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157 }
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0
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158 }
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159
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160 max_changes = dpcf->changes;
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161
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162 if (nevents < dpcf->events) {
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163 if (event_list) {
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164 ngx_free(event_list);
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165 }
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166
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50
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167 event_list = ngx_alloc(sizeof(struct pollfd) * dpcf->events,
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168 cycle->log);
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169 if (event_list == NULL) {
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170 return NGX_ERROR;
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171 }
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0
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172 }
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173
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174 nevents = dpcf->events;
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175
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176 ngx_io = ngx_os_io;
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177
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178 ngx_event_actions = ngx_devpoll_module_ctx.actions;
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179
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92
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180 ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_FD_EVENT;
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0
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181
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182 return NGX_OK;
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183 }
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184
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185
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48
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186 static void
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187 ngx_devpoll_done(ngx_cycle_t *cycle)
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0
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188 {
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189 if (close(dp) == -1) {
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190 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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191 "close(/dev/poll) failed");
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192 }
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193
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194 dp = -1;
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195
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196 ngx_free(change_list);
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197 ngx_free(event_list);
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198 ngx_free(change_index);
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199
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200 change_list = NULL;
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201 event_list = NULL;
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202 change_index = NULL;
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203 max_changes = 0;
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204 nchanges = 0;
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205 nevents = 0;
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206 }
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207
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208
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48
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209 static ngx_int_t
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210 ngx_devpoll_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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211 {
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212 #if (NGX_DEBUG)
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213 ngx_connection_t *c;
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214 #endif
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215
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216 #if (NGX_READ_EVENT != POLLIN)
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2
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217 event = (event == NGX_READ_EVENT) ? POLLIN : POLLOUT;
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0
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218 #endif
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219
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220 #if (NGX_DEBUG)
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221 c = ev->data;
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222 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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223 "devpoll add event: fd:%d ev:%04Xd", c->fd, event);
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224 #endif
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225
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226 ev->active = 1;
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2
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227
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228 return ngx_devpoll_set_event(ev, event, 0);
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229 }
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230
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231
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48
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232 static ngx_int_t
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233 ngx_devpoll_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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234 {
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235 ngx_event_t *e;
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236 ngx_connection_t *c;
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237
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238 c = ev->data;
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239
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2
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240 #if (NGX_READ_EVENT != POLLIN)
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241 event = (event == NGX_READ_EVENT) ? POLLIN : POLLOUT;
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242 #endif
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243
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0
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244 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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245 "devpoll del event: fd:%d ev:%04Xd", c->fd, event);
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0
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246
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247 if (ngx_devpoll_set_event(ev, POLLREMOVE, flags) == NGX_ERROR) {
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248 return NGX_ERROR;
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249 }
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250
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251 ev->active = 0;
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252
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253 if (flags & NGX_CLOSE_EVENT) {
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254 return NGX_OK;
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255 }
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256
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2
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257 /* restore the paired event if it exists */
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0
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258
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2
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259 if (event == POLLIN) {
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0
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260 e = c->write;
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261 event = POLLOUT;
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262
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263 } else {
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264 e = c->read;
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265 event = POLLIN;
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266 }
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267
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2
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268 if (e && e->active) {
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0
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269 return ngx_devpoll_set_event(e, event, 0);
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270 }
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271
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272 return NGX_OK;
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273 }
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274
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275
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48
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276 static ngx_int_t
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277 ngx_devpoll_set_event(ngx_event_t *ev, int event, u_int flags)
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0
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278 {
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279 size_t n;
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280 ngx_connection_t *c;
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281
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282 c = ev->data;
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283
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284 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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285 "devpoll fd:%d ev:%04Xd fl:%04Xd", c->fd, event, flags);
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0
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286
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287 if (nchanges >= max_changes) {
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288 ngx_log_error(NGX_LOG_WARN, ev->log, 0,
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289 "/dev/pool change list is filled up");
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290
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291 n = nchanges * sizeof(struct pollfd);
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292 if (write(dp, change_list, n) != (ssize_t) n) {
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293 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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294 "write(/dev/poll) failed");
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295 return NGX_ERROR;
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296 }
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297
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298 nchanges = 0;
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299 }
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300
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301 change_list[nchanges].fd = c->fd;
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302 change_list[nchanges].events = event;
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303 change_list[nchanges].revents = 0;
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304
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305 change_index[nchanges] = ev;
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306 ev->index = nchanges;
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307
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308 nchanges++;
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309
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310 if (flags & NGX_CLOSE_EVENT) {
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311 n = nchanges * sizeof(struct pollfd);
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312 if (write(dp, change_list, n) != (ssize_t) n) {
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313 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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314 "write(/dev/poll) failed");
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315 return NGX_ERROR;
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316 }
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317
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318 nchanges = 0;
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319 }
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320
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321 return NGX_OK;
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322 }
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323
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324
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48
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325 ngx_int_t
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326 ngx_devpoll_process_events(ngx_cycle_t *cycle)
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0
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327 {
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32
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328 int events, revents;
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0
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329 ngx_int_t i;
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50
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330 ngx_uint_t lock, accept_lock, expire;
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331 size_t n;
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332 ngx_msec_t timer;
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333 ngx_err_t err;
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50
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334 #if 0
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0
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335 ngx_cycle_t **old_cycle;
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50
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336 #endif
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0
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337 ngx_event_t *rev, *wev;
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338 ngx_connection_t *c;
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339 ngx_epoch_msec_t delta;
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340 struct dvpoll dvp;
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341 struct timeval tv;
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342
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343 for ( ;; ) {
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344 timer = ngx_event_find_timer();
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345
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346 if (timer != 0) {
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347 break;
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348 }
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349
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350 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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351 "devpoll expired timer");
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352
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353 ngx_event_expire_timers((ngx_msec_t)
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354 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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355 }
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356
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357 /* NGX_TIMER_INFINITE == INFTIM */
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358
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359 if (timer == NGX_TIMER_INFINITE) {
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360 expire = 0;
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361
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362 } else {
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363 expire = 1;
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364 }
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365
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366 ngx_old_elapsed_msec = ngx_elapsed_msec;
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367 accept_lock = 0;
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368
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369 if (ngx_accept_mutex) {
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370 if (ngx_accept_disabled > 0) {
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371 ngx_accept_disabled--;
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372
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373 } else {
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374 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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375 return NGX_ERROR;
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376 }
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377
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378 if (ngx_accept_mutex_held) {
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379 accept_lock = 1;
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380
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381 } else if (timer == NGX_TIMER_INFINITE
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382 || timer > ngx_accept_mutex_delay)
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383 {
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384 timer = ngx_accept_mutex_delay;
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385 expire = 0;
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386 }
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387 }
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388 }
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389
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390 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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391 "devpoll timer: %d", timer);
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392
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393 if (nchanges) {
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394 n = nchanges * sizeof(struct pollfd);
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395 if (write(dp, change_list, n) != (ssize_t) n) {
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396 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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397 "write(/dev/poll) failed");
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398 ngx_accept_mutex_unlock();
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399 return NGX_ERROR;
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400 }
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401 }
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402
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403 dvp.dp_fds = event_list;
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404 dvp.dp_nfds = nevents;
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405 dvp.dp_timeout = timer;
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406 events = ioctl(dp, DP_POLL, &dvp);
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407
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408 if (events == -1) {
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409 err = ngx_errno;
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410 } else {
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411 err = 0;
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412 }
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413
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414 nchanges = 0;
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415
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416 ngx_gettimeofday(&tv);
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417 ngx_time_update(tv.tv_sec);
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418
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|
|
419 delta = ngx_elapsed_msec;
|
|
|
420 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
|
|
|
421 + tv.tv_usec / 1000 - ngx_start_msec;
|
|
|
422
|
|
|
423 if (err) {
|
|
|
424 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
425 cycle->log, err, "ioctl(DP_POLL) failed");
|
|
|
426 ngx_accept_mutex_unlock();
|
|
|
427 return NGX_ERROR;
|
|
|
428 }
|
|
|
429
|
|
|
430 if (timer != NGX_TIMER_INFINITE) {
|
|
|
431 delta = ngx_elapsed_msec - delta;
|
|
|
432
|
|
|
433 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
434 "devpoll timer: %d, delta: %d", timer, (int) delta);
|
|
|
435 } else {
|
|
|
436 if (events == 0) {
|
|
|
437 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
438 "ioctl(DP_POLL) returned no events without timeout");
|
|
|
439 ngx_accept_mutex_unlock();
|
|
|
440 return NGX_ERROR;
|
|
|
441 }
|
|
|
442 }
|
|
|
443
|
|
|
444 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
445 ngx_accept_mutex_unlock();
|
|
|
446 return NGX_ERROR;
|
|
|
447 }
|
|
|
448
|
|
|
449 lock = 1;
|
|
|
450
|
|
|
451 for (i = 0; i < events; i++) {
|
|
92
|
452 c = ngx_cycle->files[event_list[i].fd];
|
|
0
|
453
|
|
|
454 if (c->fd == -1) {
|
|
92
|
455 if (c->read->closed) {
|
|
22
|
456 continue;
|
|
|
457 }
|
|
|
458
|
|
|
459 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
|
|
|
460 continue;
|
|
|
461 }
|
|
|
462
|
|
32
|
463 revents = event_list[i].revents;
|
|
|
464
|
|
0
|
465 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
466 "devpoll: fd:%d, ev:%04Xd, rev:%04Xd",
|
|
32
|
467 event_list[i].fd, event_list[i].events, revents);
|
|
0
|
468
|
|
32
|
469 if (revents & (POLLERR|POLLHUP|POLLNVAL)) {
|
|
0
|
470 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
10
|
471 "ioctl(DP_POLL) error fd:%d ev:%04Xd rev:%04Xd",
|
|
32
|
472 event_list[i].fd, event_list[i].events, revents);
|
|
0
|
473 }
|
|
|
474
|
|
32
|
475 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
|
|
0
|
476 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
477 "strange ioctl(DP_POLL) events "
|
|
10
|
478 "fd:%d ev:%04Xd rev:%04Xd",
|
|
32
|
479 event_list[i].fd, event_list[i].events, revents);
|
|
|
480 }
|
|
|
481
|
|
|
482 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
|
|
|
483 && (revents & (POLLIN|POLLOUT)) == 0)
|
|
|
484 {
|
|
|
485 /*
|
|
|
486 * if the error events were returned without POLLIN or POLLOUT,
|
|
|
487 * then add these flags to handle the events at least in one
|
|
|
488 * active handler
|
|
|
489 */
|
|
|
490
|
|
|
491 revents |= POLLIN|POLLOUT;
|
|
0
|
492 }
|
|
|
493
|
|
|
494 wev = c->write;
|
|
|
495
|
|
32
|
496 if ((revents & POLLOUT) && wev->active) {
|
|
0
|
497 wev->ready = 1;
|
|
|
498
|
|
|
499 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
58
|
500 wev->handler(wev);
|
|
0
|
501
|
|
|
502 } else {
|
|
|
503 ngx_post_event(wev);
|
|
|
504 }
|
|
|
505 }
|
|
|
506
|
|
|
507 /*
|
|
|
508 * POLLIN must be handled after POLLOUT because we use
|
|
|
509 * the optimization to avoid the unnecessary mutex locking/unlocking
|
|
|
510 * if the accept event is the last one.
|
|
|
511 */
|
|
|
512
|
|
|
513 rev = c->read;
|
|
|
514
|
|
32
|
515 if ((revents & POLLIN) && rev->active) {
|
|
0
|
516 rev->ready = 1;
|
|
|
517
|
|
|
518 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
58
|
519 rev->handler(rev);
|
|
0
|
520
|
|
|
521 } else if (!rev->accept) {
|
|
|
522 ngx_post_event(rev);
|
|
|
523
|
|
|
524 } else if (ngx_accept_disabled <= 0) {
|
|
|
525 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
526
|
|
58
|
527 c->read->handler(rev);
|
|
0
|
528
|
|
|
529 if (ngx_accept_disabled > 0) {
|
|
|
530 ngx_accept_mutex_unlock();
|
|
|
531 accept_lock = 0;
|
|
|
532 }
|
|
|
533
|
|
|
534 if (i + 1 == events) {
|
|
|
535 lock = 0;
|
|
|
536 break;
|
|
|
537 }
|
|
|
538
|
|
|
539 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
540 if (accept_lock) {
|
|
|
541 ngx_accept_mutex_unlock();
|
|
|
542 }
|
|
|
543 return NGX_ERROR;
|
|
|
544 }
|
|
|
545 }
|
|
|
546 }
|
|
|
547 }
|
|
|
548
|
|
|
549 if (accept_lock) {
|
|
|
550 ngx_accept_mutex_unlock();
|
|
|
551 }
|
|
|
552
|
|
|
553 if (lock) {
|
|
|
554 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
555 }
|
|
|
556
|
|
|
557 if (expire && delta) {
|
|
|
558 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
|
559 }
|
|
|
560
|
|
|
561 if (!ngx_threaded) {
|
|
|
562 ngx_event_process_posted(cycle);
|
|
|
563 }
|
|
|
564
|
|
|
565 return NGX_OK;
|
|
|
566 }
|
|
|
567
|
|
|
568
|
|
48
|
569 static void *
|
|
|
570 ngx_devpoll_create_conf(ngx_cycle_t *cycle)
|
|
0
|
571 {
|
|
|
572 ngx_devpoll_conf_t *dpcf;
|
|
|
573
|
|
50
|
574 dpcf = ngx_palloc(cycle->pool, sizeof(ngx_devpoll_conf_t));
|
|
|
575 if (dpcf == NULL) {
|
|
|
576 return NGX_CONF_ERROR;
|
|
|
577 }
|
|
0
|
578
|
|
|
579 dpcf->changes = NGX_CONF_UNSET;
|
|
|
580 dpcf->events = NGX_CONF_UNSET;
|
|
|
581
|
|
|
582 return dpcf;
|
|
|
583 }
|
|
|
584
|
|
|
585
|
|
48
|
586 static char *
|
|
|
587 ngx_devpoll_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
588 {
|
|
|
589 ngx_devpoll_conf_t *dpcf = conf;
|
|
|
590
|
|
36
|
591 ngx_conf_init_unsigned_value(dpcf->changes, 32);
|
|
|
592 ngx_conf_init_unsigned_value(dpcf->events, 32);
|
|
0
|
593
|
|
|
594 return NGX_CONF_OK;
|
|
|
595 }
|
