0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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12 #if (TEST_BUILD_RTSIG)
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13
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14 #define F_SETSIG 10
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15 #define SIGRTMIN 33
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16 #define si_fd __spare__[0]
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17 #define KERN_RTSIGNR 30
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18 #define KERN_RTSIGMAX 31
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19
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20 int sigtimedwait(const sigset_t *set, siginfo_t *info,
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21 const struct timespec *timeout)
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22 {
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23 return -1;
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24 }
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25
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26 int ngx_linux_rtsig_max;
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27
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28 #endif
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29
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30
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31 typedef struct {
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32 int signo;
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33 ngx_int_t overflow_events;
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34 ngx_int_t overflow_test;
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35 ngx_int_t overflow_threshold;
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36 } ngx_rtsig_conf_t;
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37
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38
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39 extern ngx_event_module_t ngx_poll_module_ctx;
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40
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41 static ngx_int_t ngx_rtsig_init(ngx_cycle_t *cycle);
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42 static void ngx_rtsig_done(ngx_cycle_t *cycle);
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43 static ngx_int_t ngx_rtsig_add_connection(ngx_connection_t *c);
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44 static ngx_int_t ngx_rtsig_del_connection(ngx_connection_t *c, u_int flags);
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45 static ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle);
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46 static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle);
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47
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48 static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle);
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49 static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf);
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50 static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
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51 void *post, void *data);
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52
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53
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54 static sigset_t set;
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55 static ngx_uint_t overflow, overflow_current;
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56 static struct pollfd *overflow_list;
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57
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58
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59 static ngx_str_t rtsig_name = ngx_string("rtsig");
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60
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61 static ngx_conf_num_bounds_t ngx_overflow_threshold_bounds = {
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62 ngx_check_ngx_overflow_threshold_bounds, 2, 10
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63 };
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64
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65
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66 static ngx_command_t ngx_rtsig_commands[] = {
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67
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68 {ngx_string("rtsig_signo"),
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69 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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70 ngx_conf_set_num_slot,
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71 0,
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72 offsetof(ngx_rtsig_conf_t, signo),
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73 NULL},
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74
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75 {ngx_string("rtsig_overflow_events"),
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76 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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77 ngx_conf_set_num_slot,
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78 0,
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79 offsetof(ngx_rtsig_conf_t, overflow_events),
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80 NULL},
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81
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82 {ngx_string("rtsig_overflow_test"),
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83 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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84 ngx_conf_set_num_slot,
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85 0,
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86 offsetof(ngx_rtsig_conf_t, overflow_test),
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87 NULL},
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88
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89 {ngx_string("rtsig_overflow_threshold"),
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90 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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91 ngx_conf_set_num_slot,
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92 0,
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93 offsetof(ngx_rtsig_conf_t, overflow_threshold),
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94 &ngx_overflow_threshold_bounds},
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95
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96 ngx_null_command
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97 };
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98
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99
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100 ngx_event_module_t ngx_rtsig_module_ctx = {
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101 &rtsig_name,
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102 ngx_rtsig_create_conf, /* create configuration */
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103 ngx_rtsig_init_conf, /* init configuration */
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104
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105 {
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106 NULL, /* add an event */
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107 NULL, /* delete an event */
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108 NULL, /* enable an event */
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109 NULL, /* disable an event */
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110 ngx_rtsig_add_connection, /* add an connection */
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111 ngx_rtsig_del_connection, /* delete an connection */
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112 NULL, /* process the changes */
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113 ngx_rtsig_process_events, /* process the events */
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114 ngx_rtsig_init, /* init the events */
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115 ngx_rtsig_done, /* done the events */
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116 }
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117
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118 };
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119
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120 ngx_module_t ngx_rtsig_module = {
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121 NGX_MODULE,
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122 &ngx_rtsig_module_ctx, /* module context */
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123 ngx_rtsig_commands, /* module directives */
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124 NGX_EVENT_MODULE, /* module type */
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125 NULL, /* init module */
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126 NULL /* init process */
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127 };
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128
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129
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130 static ngx_int_t ngx_rtsig_init(ngx_cycle_t *cycle)
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131 {
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132 ngx_rtsig_conf_t *rtscf;
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133
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134 if (ngx_poll_module_ctx.actions.init(cycle) == NGX_ERROR) {
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135 return NGX_ERROR;
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136 }
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137
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138 rtscf = ngx_event_get_conf(cycle->conf_ctx, ngx_rtsig_module);
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139
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140 sigemptyset(&set);
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141 sigaddset(&set, rtscf->signo);
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142 sigaddset(&set, rtscf->signo + 1);
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143 sigaddset(&set, SIGIO);
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144
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145 if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
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146 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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147 "sigprocmask() failed");
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148 return NGX_ERROR;
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149 }
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150
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151 if (overflow_list) {
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152 ngx_free(overflow_list);
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153 }
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154
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155 overflow_list = ngx_alloc(sizeof(struct pollfd) * rtscf->overflow_events,
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156 cycle->log);
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157 if (overflow_list == NULL) {
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158 return NGX_ERROR;
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159 }
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160
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161 ngx_io = ngx_os_io;
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162
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163 ngx_event_actions = ngx_rtsig_module_ctx.actions;
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164
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165 ngx_event_flags = NGX_USE_RTSIG_EVENT|NGX_HAVE_GREEDY_EVENT;
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166
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167 return NGX_OK;
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168 }
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169
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170
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171 static void ngx_rtsig_done(ngx_cycle_t *cycle)
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172 {
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173 ngx_poll_module_ctx.actions.done(cycle);
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174 }
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175
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176
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177 static ngx_int_t ngx_rtsig_add_connection(ngx_connection_t *c)
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178 {
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179 int signo;
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180 ngx_rtsig_conf_t *rtscf;
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181
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182 if (c->read->accept && c->read->disabled) {
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183
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184 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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185 "rtsig enable connection: fd:%d", c->fd);
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186
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187 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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188 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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189 "fcntl(F_SETOWN) failed");
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190 return NGX_ERROR;
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191 }
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192
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193 c->read->active = 1;
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194 c->read->disabled = 0;
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195 }
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196
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197 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
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198
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199 signo = rtscf->signo + c->read->instance;
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200
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201 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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202 "rtsig add connection: fd:%d signo:%d", c->fd, signo);
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203
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204 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) == -1) {
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205 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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206 "fcntl(O_RDWR|O_NONBLOCK|O_ASYNC) failed");
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207 return NGX_ERROR;
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208 }
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209
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210 if (fcntl(c->fd, F_SETSIG, signo) == -1) {
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211 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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212 "fcntl(F_SETSIG) failed");
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213 return NGX_ERROR;
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214 }
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215
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216 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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217 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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218 "fcntl(F_SETOWN) failed");
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219 return NGX_ERROR;
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220 }
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221
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222 #if (HAVE_ONESIGFD)
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223 if (fcntl(c->fd, F_SETAUXFL, O_ONESIGFD) == -1) {
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224 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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225 "fcntl(F_SETAUXFL) failed");
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226 return NGX_ERROR;
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227 }
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228 #endif
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229
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230 c->read->active = 1;
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231 c->write->active = 1;
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232
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233 return NGX_OK;
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234 }
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235
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236
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237 static ngx_int_t ngx_rtsig_del_connection(ngx_connection_t *c, u_int flags)
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238 {
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239 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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240 "rtsig del connection: fd:%d", c->fd);
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241
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242 if ((flags & NGX_DISABLE_EVENT) && c->read->accept) {
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243
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244 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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245 "rtsig disable connection: fd:%d", c->fd);
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246
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247 c->read->active = 0;
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248 c->read->disabled = 1;
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249 return NGX_OK;
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250 }
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251
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252 if (flags & NGX_CLOSE_EVENT) {
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253 c->read->active = 0;
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254 c->write->active = 0;
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255 return NGX_OK;
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256 }
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257
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258 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK) == -1) {
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259 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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260 "fcntl(O_RDWR|O_NONBLOCK) failed");
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261 return NGX_ERROR;
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262 }
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263
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264 c->read->active = 0;
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265 c->write->active = 0;
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266
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267 return NGX_OK;
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268 }
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269
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270
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271 ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle)
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272 {
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273 int signo;
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274 ngx_int_t instance, i;
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275 ngx_uint_t expire;
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276 size_t n;
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277 ngx_msec_t timer;
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278 ngx_err_t err;
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279 siginfo_t si;
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280 ngx_event_t *rev, *wev;
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281 struct timeval tv;
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282 struct timespec ts, *tp;
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283 struct sigaction sa;
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284 ngx_epoch_msec_t delta;
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285 ngx_connection_t *c;
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286 ngx_rtsig_conf_t *rtscf;
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287
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288 if (overflow) {
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289 timer = 0;
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290 expire = 0;
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291
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292 } else {
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293 for ( ;; ) {
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294 timer = ngx_event_find_timer();
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295
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296 #if (NGX_THREADS)
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297
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298 if (timer == NGX_TIMER_ERROR) {
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299 return NGX_ERROR;
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300 }
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301
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302 if (timer == NGX_TIMER_INFINITE || timer > 500) {
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303 timer = 500;
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304 break;
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305 }
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306
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307 #endif
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308
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309 if (timer != 0) {
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310 break;
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311 }
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312
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313 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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314 "rtsig expired timer");
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315
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316 ngx_event_expire_timers((ngx_msec_t)
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317 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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318
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319 if (ngx_posted_events && ngx_threaded) {
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320 ngx_wakeup_worker_thread(cycle);
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321 }
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322 }
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323
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324 expire = 1;
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325
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326 if (ngx_accept_mutex) {
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327 if (ngx_accept_disabled > 0) {
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328 ngx_accept_disabled--;
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329
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330 } else {
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331 ngx_accept_mutex_held = 0;
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332
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333 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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334 return NGX_ERROR;
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335 }
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336
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337 if (ngx_accept_mutex_held == 0
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338 && (timer == NGX_TIMER_INFINITE
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339 || timer > ngx_accept_mutex_delay))
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340 {
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341 timer = ngx_accept_mutex_delay;
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342 expire = 0;
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343 }
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344 }
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345 }
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346 }
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347
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348 if (timer == NGX_TIMER_INFINITE) {
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349 tp = NULL;
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350 expire = 0;
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351
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352 } else {
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353 ts.tv_sec = timer / 1000;
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354 ts.tv_nsec = (timer % 1000) * 1000000;
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355 tp = &ts;
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356 }
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357
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358 ngx_old_elapsed_msec = ngx_elapsed_msec;
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359
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360 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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361 "rtsig timer: %d", timer);
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362
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363 /* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
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364
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365 signo = sigtimedwait(&set, &si, tp);
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366
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367 if (signo == -1) {
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368 err = ngx_errno;
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369
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370 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
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371 "rtsig signo:%d", signo);
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372
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373 if (err == NGX_EAGAIN) {
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374
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375 if (timer == NGX_TIMER_INFINITE) {
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376 ngx_accept_mutex_unlock();
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377 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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378 "sigtimedwait() returned EAGAIN without timeout");
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379 return NGX_ERROR;
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380 }
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381
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382 err = 0;
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383 }
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384
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385 } else {
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386 err = 0;
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387 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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388 "rtsig signo:%d fd:%d band:%X",
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389 signo, si.si_fd, si.si_band);
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390 }
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391
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392 ngx_gettimeofday(&tv);
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393 ngx_time_update(tv.tv_sec);
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394
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395 delta = ngx_elapsed_msec;
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396 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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397 + tv.tv_usec / 1000 - ngx_start_msec;
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398
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399 if (err) {
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400 ngx_accept_mutex_unlock();
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401 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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402 cycle->log, err, "sigtimedwait() failed");
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403 return NGX_ERROR;
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404 }
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405
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406 if (timer != NGX_TIMER_INFINITE) {
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407 delta = ngx_elapsed_msec - delta;
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408
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409 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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410 "rtsig timer: %d, delta: %d", timer, (int) delta);
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411 }
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412
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413 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
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414
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415 if (signo == rtscf->signo || signo == rtscf->signo + 1) {
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416
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417 if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
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418 return NGX_OK;
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419 }
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420
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421 /* TODO: old_cycles */
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422
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423 c = &ngx_cycle->connections[si.si_fd];
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424
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425 instance = signo - rtscf->signo;
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426
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427 rev = c->read;
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428
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429 if (c->read->instance != instance) {
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430
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431 /*
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432 * the stale event from a file descriptor
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433 * that was just closed in this iteration
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434 */
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435
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436 ngx_accept_mutex_unlock();
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437
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438 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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439 "rtsig: stale event " PTR_FMT, c);
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440
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441 return NGX_OK;
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442 }
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443
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444 if (si.si_band & (POLLIN|POLLHUP|POLLERR)) {
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445 if (rev->active) {
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446
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447 if (ngx_threaded && !rev->accept) {
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448 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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449 ngx_accept_mutex_unlock();
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450 return NGX_ERROR;
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451 }
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452
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453 rev->posted_ready = 1;
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454 ngx_post_event(rev);
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455
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456 ngx_mutex_unlock(ngx_posted_events_mutex);
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457
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458 } else {
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459 rev->ready = 1;
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460
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461 if (!ngx_threaded && !ngx_accept_mutex_held) {
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462 rev->event_handler(rev);
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463
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464 } else if (rev->accept) {
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465 if (ngx_accept_disabled <= 0) {
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466 rev->event_handler(rev);
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467 }
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468
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469 } else {
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470 ngx_post_event(rev);
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471 }
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472 }
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473 }
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474 }
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475
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476 wev = c->write;
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477
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478 if (si.si_band & (POLLOUT|POLLHUP|POLLERR)) {
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479 if (wev->active) {
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480
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481 if (ngx_threaded) {
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482 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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483 ngx_accept_mutex_unlock();
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484 return NGX_ERROR;
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485 }
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|
486
|
|
487 wev->posted_ready = 1;
|
|
488 ngx_post_event(wev);
|
|
489
|
|
490 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
491
|
|
492 } else {
|
|
493 wev->ready = 1;
|
|
494
|
|
495 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
496 wev->event_handler(wev);
|
|
497
|
|
498 } else {
|
|
499 ngx_post_event(wev);
|
|
500 }
|
|
501 }
|
|
502 }
|
|
503 }
|
|
504
|
|
505 } else if (signo == SIGIO) {
|
|
506 ngx_accept_mutex_unlock();
|
|
507
|
|
508 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
509 "rt signal queue overflowed");
|
|
510
|
|
511 /* flush the RT signal queue */
|
|
512
|
|
513 ngx_memzero(&sa, sizeof(struct sigaction));
|
|
514 sa.sa_handler = SIG_DFL;
|
|
515 sigemptyset(&sa.sa_mask);
|
|
516
|
|
517 if (sigaction(rtscf->signo, &sa, NULL) == -1) {
|
|
518 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
519 "sigaction(%d, SIG_DFL) failed", rtscf->signo);
|
|
520 }
|
|
521
|
|
522 if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
|
|
523 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
524 "sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
|
|
525 }
|
|
526
|
|
527 overflow = 1;
|
|
528 overflow_current = 0;
|
|
529 ngx_event_actions.process_events = ngx_rtsig_process_overflow;
|
|
530
|
|
531 return NGX_ERROR;
|
|
532
|
|
533 } else if (signo != -1) {
|
|
534 ngx_accept_mutex_unlock();
|
|
535
|
|
536 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
537 "sigtimedwait() returned unexpected signal: %d", signo);
|
|
538
|
|
539 return NGX_ERROR;
|
|
540 }
|
|
541
|
|
542 ngx_accept_mutex_unlock();
|
|
543
|
|
544 if (expire && delta) {
|
|
545 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
546 }
|
|
547
|
|
548 if (ngx_posted_events) {
|
|
549 if (ngx_threaded) {
|
|
550 ngx_wakeup_worker_thread(cycle);
|
|
551
|
|
552 } else {
|
|
553 ngx_event_process_posted(cycle);
|
|
554 }
|
|
555 }
|
|
556
|
|
557 if (signo == -1) {
|
|
558 return NGX_AGAIN;
|
|
559 } else {
|
|
560 return NGX_OK;
|
|
561 }
|
|
562 }
|
|
563
|
|
564
|
|
565 /* TODO: old cylces */
|
|
566
|
|
567 static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle)
|
|
568 {
|
|
569 int name[2], rtsig_max, rtsig_nr, events, ready;
|
|
570 size_t len;
|
|
571 ngx_int_t tested, n, i;
|
|
572 ngx_err_t err;
|
|
573 ngx_event_t *rev, *wev;
|
|
574 ngx_connection_t *c;
|
|
575 ngx_rtsig_conf_t *rtscf;
|
|
576
|
|
577 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
578
|
|
579 tested = 0;
|
|
580
|
|
581 for ( ;; ) {
|
|
582
|
|
583 n = 0;
|
|
584 while (n < rtscf->overflow_events) {
|
|
585
|
|
586 if (overflow_current == cycle->connection_n) {
|
|
587 break;
|
|
588 }
|
|
589
|
|
590 c = &cycle->connections[overflow_current++];
|
|
591
|
|
592 if (c->fd == -1) {
|
|
593 continue;
|
|
594 }
|
|
595
|
|
596 events = 0;
|
|
597
|
|
598 if (c->read->active && c->read->event_handler) {
|
|
599 events |= POLLIN;
|
|
600 }
|
|
601
|
|
602 if (c->write->active && c->write->event_handler) {
|
|
603 events |= POLLOUT;
|
|
604 }
|
|
605
|
|
606 if (events == 0) {
|
|
607 continue;
|
|
608 }
|
|
609
|
|
610 overflow_list[n].fd = c->fd;
|
|
611 overflow_list[n].events = events;
|
|
612 overflow_list[n].revents = 0;
|
|
613 n++;
|
|
614 }
|
|
615
|
|
616 if (n == 0) {
|
|
617 break;
|
|
618 }
|
|
619
|
|
620 for ( ;; ) {
|
|
621 ready = poll(overflow_list, n, 0);
|
|
622
|
|
623 if (ready == -1) {
|
|
624 err = ngx_errno;
|
|
625 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
626 cycle->log, 0,
|
|
627 "poll() failed while the overflow recover");
|
|
628
|
|
629 if (err == NGX_EINTR) {
|
|
630 continue;
|
|
631 }
|
|
632 }
|
|
633
|
|
634 break;
|
|
635 }
|
|
636
|
|
637 if (ready <= 0) {
|
|
638 continue;
|
|
639 }
|
|
640
|
|
641 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
642 return NGX_ERROR;
|
|
643 }
|
|
644
|
|
645 for (i = 0; i < n; i++) {
|
|
646 c = &cycle->connections[overflow_list[i].fd];
|
|
647
|
|
648 rev = c->read;
|
|
649
|
|
650 if (rev->active
|
|
651 && !rev->closed
|
|
652 && rev->event_handler
|
|
653 && (overflow_list[i].revents
|
|
654 & (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
|
|
655 {
|
|
656 tested++;
|
|
657
|
|
658 if (ngx_threaded) {
|
|
659 rev->posted_ready = 1;
|
|
660 ngx_post_event(rev);
|
|
661
|
|
662 } else {
|
|
663 rev->ready = 1;
|
|
664 rev->event_handler(rev);
|
|
665 }
|
|
666 }
|
|
667
|
|
668 wev = c->write;
|
|
669
|
|
670 if (wev->active
|
|
671 && !wev->closed
|
|
672 && wev->event_handler
|
|
673 && (overflow_list[i].revents
|
|
674 & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
|
|
675 {
|
|
676 tested++;
|
|
677
|
|
678 if (ngx_threaded) {
|
|
679 wev->posted_ready = 1;
|
|
680 ngx_post_event(wev);
|
|
681
|
|
682 } else {
|
|
683 wev->ready = 1;
|
|
684 wev->event_handler(wev);
|
|
685 }
|
|
686 }
|
|
687 }
|
|
688
|
|
689 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
690
|
|
691 if (tested >= rtscf->overflow_test) {
|
|
692
|
|
693 if (ngx_linux_rtsig_max) {
|
|
694
|
|
695 /*
|
|
696 * Check the current rt queue length to prevent
|
|
697 * the new overflow.
|
|
698 *
|
|
699 * Learn the /proc/sys/kernel/rtsig-max value because
|
|
700 * it can be changed sisnce the last checking.
|
|
701 */
|
|
702
|
|
703 name[0] = CTL_KERN;
|
|
704 name[1] = KERN_RTSIGMAX;
|
|
705 len = sizeof(rtsig_max);
|
|
706 if (sysctl(name, sizeof(name), &rtsig_max, &len, NULL, 0) == -1)
|
|
707 {
|
|
708 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
709 "sysctl(KERN_RTSIGMAX) failed");
|
|
710 return NGX_ERROR;
|
|
711 }
|
|
712
|
|
713 name[0] = CTL_KERN;
|
|
714 name[1] = KERN_RTSIGNR;
|
|
715 len = sizeof(rtsig_nr);
|
|
716 if (sysctl(name, sizeof(name), &rtsig_nr, &len, NULL, 0) == -1)
|
|
717 {
|
|
718 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
719 "sysctl(KERN_RTSIGNR) failed");
|
|
720 return NGX_ERROR;
|
|
721 }
|
|
722
|
|
723 /*
|
|
724 * drain the rt signal queue if the /proc/sys/kernel/rtsig-nr
|
|
725 * is bigger than
|
|
726 * /proc/sys/kernel/rtsig-max / rtsig_overflow_threshold
|
|
727 */
|
|
728
|
|
729 if (rtsig_max / rtscf->overflow_threshold < rtsig_nr) {
|
|
730 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
731 "rtsig queue state: %d/%d",
|
|
732 rtsig_nr, rtsig_max);
|
|
733 while (ngx_rtsig_process_events(cycle) == NGX_OK) {
|
|
734 /* void */
|
|
735 }
|
|
736 }
|
|
737
|
|
738 } else {
|
|
739
|
|
740 /*
|
|
741 * Linux has not KERN_RTSIGMAX since 2.6.6-mm2
|
|
742 * so drain the rt signal queue unconditionally
|
|
743 */
|
|
744
|
|
745 while (ngx_rtsig_process_events(cycle) == NGX_OK) { /* void */ }
|
|
746 }
|
|
747
|
|
748 tested = 0;
|
|
749 }
|
|
750 }
|
|
751
|
|
752 if (ngx_posted_events) {
|
|
753 if (ngx_threaded) {
|
|
754 ngx_wakeup_worker_thread(cycle);
|
|
755
|
|
756 } else {
|
|
757 ngx_event_process_posted(cycle);
|
|
758 }
|
|
759 }
|
|
760
|
|
761 ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
|
|
762 "rt signal queue overflow recovered");
|
|
763
|
|
764 overflow = 0;
|
|
765 ngx_event_actions.process_events = ngx_rtsig_process_events;
|
|
766
|
|
767 return NGX_OK;
|
|
768 }
|
|
769
|
|
770
|
|
771 static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle)
|
|
772 {
|
|
773 ngx_rtsig_conf_t *rtscf;
|
|
774
|
|
775 ngx_test_null(rtscf, ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t)),
|
|
776 NGX_CONF_ERROR);
|
|
777
|
|
778 rtscf->signo = NGX_CONF_UNSET;
|
|
779 rtscf->overflow_events = NGX_CONF_UNSET;
|
|
780 rtscf->overflow_test = NGX_CONF_UNSET;
|
|
781 rtscf->overflow_threshold = NGX_CONF_UNSET;
|
|
782
|
|
783 return rtscf;
|
|
784 }
|
|
785
|
|
786
|
|
787 static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
788 {
|
|
789 ngx_rtsig_conf_t *rtscf = conf;
|
|
790
|
|
791 /* LinuxThreads use the first 3 RT signals */
|
|
792 ngx_conf_init_value(rtscf->signo, SIGRTMIN + 10);
|
|
793
|
|
794 ngx_conf_init_value(rtscf->overflow_events, 16);
|
|
795 ngx_conf_init_value(rtscf->overflow_test, 32);
|
|
796 ngx_conf_init_value(rtscf->overflow_threshold, 10);
|
|
797
|
|
798 return NGX_CONF_OK;
|
|
799 }
|
|
800
|
|
801
|
|
802 static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
|
|
803 void *post, void *data)
|
|
804 {
|
|
805 if (ngx_linux_rtsig_max) {
|
|
806 return ngx_conf_check_num_bounds(cf, post, data);
|
|
807 }
|
|
808
|
|
809 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
|
810 "\"rtsig_overflow_threshold\" is not supported "
|
|
811 "since Linux 2.6.6-mm2, ignored");
|
|
812
|
|
813 return NGX_CONF_OK;
|
|
814 }
|