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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_RTSIG)
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0
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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 rtscf = ngx_event_get_conf(cycle->conf_ctx, ngx_rtsig_module);
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135
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136 sigemptyset(&set);
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137 sigaddset(&set, rtscf->signo);
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138 sigaddset(&set, rtscf->signo + 1);
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139 sigaddset(&set, SIGIO);
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140
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141 if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
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142 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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143 "sigprocmask() failed");
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144 return NGX_ERROR;
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145 }
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146
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147 if (overflow_list) {
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148 ngx_free(overflow_list);
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149 }
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150
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151 overflow_list = ngx_alloc(sizeof(struct pollfd) * rtscf->overflow_events,
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152 cycle->log);
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153 if (overflow_list == NULL) {
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154 return NGX_ERROR;
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155 }
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156
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157 ngx_io = ngx_os_io;
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158
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159 ngx_event_actions = ngx_rtsig_module_ctx.actions;
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160
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4
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161 ngx_event_flags = NGX_USE_RTSIG_EVENT|NGX_USE_GREEDY_EVENT;
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0
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162
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163 return NGX_OK;
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164 }
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165
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166
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167 static void ngx_rtsig_done(ngx_cycle_t *cycle)
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168 {
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2
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169 ngx_free(overflow_list);
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170
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171 overflow_list = NULL;
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0
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172 }
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173
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174
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175 static ngx_int_t ngx_rtsig_add_connection(ngx_connection_t *c)
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176 {
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177 int signo;
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178 ngx_rtsig_conf_t *rtscf;
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179
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180 if (c->read->accept && c->read->disabled) {
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181
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182 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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183 "rtsig enable connection: fd:%d", c->fd);
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184
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185 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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186 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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187 "fcntl(F_SETOWN) failed");
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188 return NGX_ERROR;
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189 }
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190
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191 c->read->active = 1;
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192 c->read->disabled = 0;
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193 }
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194
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195 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
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196
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197 signo = rtscf->signo + c->read->instance;
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198
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199 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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200 "rtsig add connection: fd:%d signo:%d", c->fd, signo);
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201
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202 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) == -1) {
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203 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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204 "fcntl(O_RDWR|O_NONBLOCK|O_ASYNC) failed");
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205 return NGX_ERROR;
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206 }
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207
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208 if (fcntl(c->fd, F_SETSIG, signo) == -1) {
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209 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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210 "fcntl(F_SETSIG) failed");
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211 return NGX_ERROR;
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212 }
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213
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214 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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215 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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216 "fcntl(F_SETOWN) failed");
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217 return NGX_ERROR;
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218 }
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219
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18
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220 #if (NGX_HAVE_ONESIGFD)
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221 if (fcntl(c->fd, F_SETAUXFL, O_ONESIGFD) == -1) {
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222 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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223 "fcntl(F_SETAUXFL) failed");
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224 return NGX_ERROR;
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225 }
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226 #endif
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227
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228 c->read->active = 1;
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229 c->write->active = 1;
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230
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231 return NGX_OK;
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232 }
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233
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234
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235 static ngx_int_t ngx_rtsig_del_connection(ngx_connection_t *c, u_int flags)
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236 {
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237 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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238 "rtsig del connection: fd:%d", c->fd);
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239
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240 if ((flags & NGX_DISABLE_EVENT) && c->read->accept) {
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241
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242 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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243 "rtsig disable connection: fd:%d", c->fd);
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244
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245 c->read->active = 0;
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246 c->read->disabled = 1;
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247 return NGX_OK;
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248 }
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249
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250 if (flags & NGX_CLOSE_EVENT) {
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251 c->read->active = 0;
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252 c->write->active = 0;
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253 return NGX_OK;
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254 }
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255
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256 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK) == -1) {
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257 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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258 "fcntl(O_RDWR|O_NONBLOCK) failed");
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259 return NGX_ERROR;
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260 }
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261
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262 c->read->active = 0;
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263 c->write->active = 0;
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264
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265 return NGX_OK;
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266 }
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267
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268
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269 ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle)
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270 {
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271 int signo;
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272 ngx_int_t instance, i;
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273 ngx_uint_t expire;
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274 size_t n;
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275 ngx_msec_t timer;
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276 ngx_err_t err;
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277 siginfo_t si;
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278 ngx_event_t *rev, *wev;
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279 struct timeval tv;
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280 struct timespec ts, *tp;
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281 struct sigaction sa;
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282 ngx_epoch_msec_t delta;
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283 ngx_connection_t *c;
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284 ngx_rtsig_conf_t *rtscf;
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285
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286 if (overflow) {
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287 timer = 0;
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288 expire = 0;
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289
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290 } else {
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291 for ( ;; ) {
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292 timer = ngx_event_find_timer();
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293
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294 #if (NGX_THREADS)
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295
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296 if (timer == NGX_TIMER_ERROR) {
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297 return NGX_ERROR;
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298 }
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299
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300 if (timer == NGX_TIMER_INFINITE || timer > 500) {
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301 timer = 500;
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302 break;
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303 }
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304
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305 #endif
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306
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307 if (timer != 0) {
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308 break;
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309 }
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310
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311 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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312 "rtsig expired timer");
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313
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314 ngx_event_expire_timers((ngx_msec_t)
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315 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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316
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317 if (ngx_posted_events && ngx_threaded) {
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318 ngx_wakeup_worker_thread(cycle);
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319 }
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320 }
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321
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322 expire = 1;
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323
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324 if (ngx_accept_mutex) {
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325 if (ngx_accept_disabled > 0) {
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326 ngx_accept_disabled--;
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327
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328 } else {
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329 ngx_accept_mutex_held = 0;
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330
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331 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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332 return NGX_ERROR;
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333 }
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334
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335 if (ngx_accept_mutex_held == 0
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336 && (timer == NGX_TIMER_INFINITE
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337 || timer > ngx_accept_mutex_delay))
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338 {
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339 timer = ngx_accept_mutex_delay;
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340 expire = 0;
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341 }
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342 }
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343 }
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344 }
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345
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346 if (timer == NGX_TIMER_INFINITE) {
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347 tp = NULL;
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348 expire = 0;
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349
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350 } else {
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351 ts.tv_sec = timer / 1000;
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352 ts.tv_nsec = (timer % 1000) * 1000000;
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353 tp = &ts;
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354 }
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355
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356 ngx_old_elapsed_msec = ngx_elapsed_msec;
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357
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358 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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359 "rtsig timer: %d", timer);
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360
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361 /* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
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362
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363 signo = sigtimedwait(&set, &si, tp);
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364
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365 if (signo == -1) {
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366 err = ngx_errno;
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367
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368 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
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369 "rtsig signo:%d", signo);
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370
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371 if (err == NGX_EAGAIN) {
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372
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373 if (timer == NGX_TIMER_INFINITE) {
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374 ngx_accept_mutex_unlock();
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375 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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376 "sigtimedwait() returned EAGAIN without timeout");
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377 return NGX_ERROR;
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378 }
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379
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380 err = 0;
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381 }
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382
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383 } else {
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384 err = 0;
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385 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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386 "rtsig signo:%d fd:%d band:%04Xd",
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0
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387 signo, si.si_fd, si.si_band);
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388 }
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389
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390 ngx_gettimeofday(&tv);
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391 ngx_time_update(tv.tv_sec);
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392
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393 delta = ngx_elapsed_msec;
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394 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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395 + tv.tv_usec / 1000 - ngx_start_msec;
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396
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397 if (err) {
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398 ngx_accept_mutex_unlock();
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399 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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400 cycle->log, err, "sigtimedwait() failed");
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401 return NGX_ERROR;
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402 }
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403
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404 if (timer != NGX_TIMER_INFINITE) {
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405 delta = ngx_elapsed_msec - delta;
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406
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407 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
408 "rtsig timer: %d, delta: %d", timer, (int) delta);
|
|
|
409 }
|
|
|
410
|
|
|
411 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
|
412
|
|
|
413 if (signo == rtscf->signo || signo == rtscf->signo + 1) {
|
|
|
414
|
|
|
415 if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
|
|
|
416 return NGX_OK;
|
|
|
417 }
|
|
|
418
|
|
|
419 /* TODO: old_cycles */
|
|
|
420
|
|
|
421 c = &ngx_cycle->connections[si.si_fd];
|
|
|
422
|
|
|
423 instance = signo - rtscf->signo;
|
|
|
424
|
|
|
425 rev = c->read;
|
|
|
426
|
|
|
427 if (c->read->instance != instance) {
|
|
|
428
|
|
|
429 /*
|
|
|
430 * the stale event from a file descriptor
|
|
|
431 * that was just closed in this iteration
|
|
|
432 */
|
|
|
433
|
|
|
434 ngx_accept_mutex_unlock();
|
|
|
435
|
|
|
436 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
437 "rtsig: stale event %p", c);
|
|
0
|
438
|
|
|
439 return NGX_OK;
|
|
|
440 }
|
|
|
441
|
|
|
442 if (si.si_band & (POLLIN|POLLHUP|POLLERR)) {
|
|
|
443 if (rev->active) {
|
|
|
444
|
|
|
445 if (ngx_threaded && !rev->accept) {
|
|
|
446 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
447 ngx_accept_mutex_unlock();
|
|
|
448 return NGX_ERROR;
|
|
|
449 }
|
|
|
450
|
|
|
451 rev->posted_ready = 1;
|
|
|
452 ngx_post_event(rev);
|
|
|
453
|
|
|
454 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
455
|
|
|
456 } else {
|
|
|
457 rev->ready = 1;
|
|
|
458
|
|
|
459 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
|
460 rev->event_handler(rev);
|
|
|
461
|
|
|
462 } else if (rev->accept) {
|
|
|
463 if (ngx_accept_disabled <= 0) {
|
|
|
464 rev->event_handler(rev);
|
|
|
465 }
|
|
|
466
|
|
|
467 } else {
|
|
|
468 ngx_post_event(rev);
|
|
|
469 }
|
|
|
470 }
|
|
|
471 }
|
|
|
472 }
|
|
|
473
|
|
|
474 wev = c->write;
|
|
|
475
|
|
|
476 if (si.si_band & (POLLOUT|POLLHUP|POLLERR)) {
|
|
|
477 if (wev->active) {
|
|
|
478
|
|
|
479 if (ngx_threaded) {
|
|
|
480 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
481 ngx_accept_mutex_unlock();
|
|
|
482 return NGX_ERROR;
|
|
|
483 }
|
|
|
484
|
|
|
485 wev->posted_ready = 1;
|
|
|
486 ngx_post_event(wev);
|
|
|
487
|
|
|
488 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
489
|
|
|
490 } else {
|
|
|
491 wev->ready = 1;
|
|
|
492
|
|
|
493 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
|
494 wev->event_handler(wev);
|
|
|
495
|
|
|
496 } else {
|
|
|
497 ngx_post_event(wev);
|
|
|
498 }
|
|
|
499 }
|
|
|
500 }
|
|
|
501 }
|
|
|
502
|
|
|
503 } else if (signo == SIGIO) {
|
|
|
504 ngx_accept_mutex_unlock();
|
|
|
505
|
|
|
506 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
507 "rt signal queue overflowed");
|
|
|
508
|
|
|
509 /* flush the RT signal queue */
|
|
|
510
|
|
|
511 ngx_memzero(&sa, sizeof(struct sigaction));
|
|
|
512 sa.sa_handler = SIG_DFL;
|
|
|
513 sigemptyset(&sa.sa_mask);
|
|
|
514
|
|
|
515 if (sigaction(rtscf->signo, &sa, NULL) == -1) {
|
|
|
516 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
517 "sigaction(%d, SIG_DFL) failed", rtscf->signo);
|
|
|
518 }
|
|
|
519
|
|
|
520 if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
|
|
|
521 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
522 "sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
|
|
|
523 }
|
|
|
524
|
|
|
525 overflow = 1;
|
|
|
526 overflow_current = 0;
|
|
|
527 ngx_event_actions.process_events = ngx_rtsig_process_overflow;
|
|
|
528
|
|
|
529 return NGX_ERROR;
|
|
|
530
|
|
|
531 } else if (signo != -1) {
|
|
|
532 ngx_accept_mutex_unlock();
|
|
|
533
|
|
|
534 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
535 "sigtimedwait() returned unexpected signal: %d", signo);
|
|
|
536
|
|
|
537 return NGX_ERROR;
|
|
|
538 }
|
|
|
539
|
|
|
540 ngx_accept_mutex_unlock();
|
|
|
541
|
|
|
542 if (expire && delta) {
|
|
|
543 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
|
544 }
|
|
|
545
|
|
|
546 if (ngx_posted_events) {
|
|
|
547 if (ngx_threaded) {
|
|
|
548 ngx_wakeup_worker_thread(cycle);
|
|
|
549
|
|
|
550 } else {
|
|
|
551 ngx_event_process_posted(cycle);
|
|
|
552 }
|
|
|
553 }
|
|
|
554
|
|
|
555 if (signo == -1) {
|
|
|
556 return NGX_AGAIN;
|
|
|
557 } else {
|
|
|
558 return NGX_OK;
|
|
|
559 }
|
|
|
560 }
|
|
|
561
|
|
|
562
|
|
|
563 /* TODO: old cylces */
|
|
|
564
|
|
|
565 static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle)
|
|
|
566 {
|
|
|
567 int name[2], rtsig_max, rtsig_nr, events, ready;
|
|
|
568 size_t len;
|
|
|
569 ngx_int_t tested, n, i;
|
|
|
570 ngx_err_t err;
|
|
|
571 ngx_event_t *rev, *wev;
|
|
|
572 ngx_connection_t *c;
|
|
|
573 ngx_rtsig_conf_t *rtscf;
|
|
|
574
|
|
|
575 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
|
576
|
|
|
577 tested = 0;
|
|
|
578
|
|
|
579 for ( ;; ) {
|
|
|
580
|
|
|
581 n = 0;
|
|
|
582 while (n < rtscf->overflow_events) {
|
|
|
583
|
|
|
584 if (overflow_current == cycle->connection_n) {
|
|
|
585 break;
|
|
|
586 }
|
|
|
587
|
|
|
588 c = &cycle->connections[overflow_current++];
|
|
|
589
|
|
|
590 if (c->fd == -1) {
|
|
|
591 continue;
|
|
|
592 }
|
|
|
593
|
|
|
594 events = 0;
|
|
|
595
|
|
|
596 if (c->read->active && c->read->event_handler) {
|
|
|
597 events |= POLLIN;
|
|
|
598 }
|
|
|
599
|
|
|
600 if (c->write->active && c->write->event_handler) {
|
|
|
601 events |= POLLOUT;
|
|
|
602 }
|
|
|
603
|
|
|
604 if (events == 0) {
|
|
|
605 continue;
|
|
|
606 }
|
|
|
607
|
|
|
608 overflow_list[n].fd = c->fd;
|
|
|
609 overflow_list[n].events = events;
|
|
|
610 overflow_list[n].revents = 0;
|
|
|
611 n++;
|
|
|
612 }
|
|
|
613
|
|
|
614 if (n == 0) {
|
|
|
615 break;
|
|
|
616 }
|
|
|
617
|
|
|
618 for ( ;; ) {
|
|
|
619 ready = poll(overflow_list, n, 0);
|
|
|
620
|
|
|
621 if (ready == -1) {
|
|
|
622 err = ngx_errno;
|
|
|
623 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
624 cycle->log, 0,
|
|
|
625 "poll() failed while the overflow recover");
|
|
|
626
|
|
|
627 if (err == NGX_EINTR) {
|
|
|
628 continue;
|
|
|
629 }
|
|
|
630 }
|
|
|
631
|
|
|
632 break;
|
|
|
633 }
|
|
|
634
|
|
|
635 if (ready <= 0) {
|
|
|
636 continue;
|
|
|
637 }
|
|
|
638
|
|
|
639 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
640 return NGX_ERROR;
|
|
|
641 }
|
|
|
642
|
|
|
643 for (i = 0; i < n; i++) {
|
|
|
644 c = &cycle->connections[overflow_list[i].fd];
|
|
|
645
|
|
|
646 rev = c->read;
|
|
|
647
|
|
|
648 if (rev->active
|
|
|
649 && !rev->closed
|
|
|
650 && rev->event_handler
|
|
|
651 && (overflow_list[i].revents
|
|
|
652 & (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
653 {
|
|
|
654 tested++;
|
|
|
655
|
|
|
656 if (ngx_threaded) {
|
|
|
657 rev->posted_ready = 1;
|
|
|
658 ngx_post_event(rev);
|
|
|
659
|
|
|
660 } else {
|
|
|
661 rev->ready = 1;
|
|
|
662 rev->event_handler(rev);
|
|
|
663 }
|
|
|
664 }
|
|
|
665
|
|
|
666 wev = c->write;
|
|
|
667
|
|
|
668 if (wev->active
|
|
|
669 && !wev->closed
|
|
|
670 && wev->event_handler
|
|
|
671 && (overflow_list[i].revents
|
|
|
672 & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
673 {
|
|
|
674 tested++;
|
|
|
675
|
|
|
676 if (ngx_threaded) {
|
|
|
677 wev->posted_ready = 1;
|
|
|
678 ngx_post_event(wev);
|
|
|
679
|
|
|
680 } else {
|
|
|
681 wev->ready = 1;
|
|
|
682 wev->event_handler(wev);
|
|
|
683 }
|
|
|
684 }
|
|
|
685 }
|
|
|
686
|
|
|
687 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
688
|
|
|
689 if (tested >= rtscf->overflow_test) {
|
|
|
690
|
|
|
691 if (ngx_linux_rtsig_max) {
|
|
|
692
|
|
|
693 /*
|
|
|
694 * Check the current rt queue length to prevent
|
|
|
695 * the new overflow.
|
|
|
696 *
|
|
|
697 * Learn the /proc/sys/kernel/rtsig-max value because
|
|
2
|
698 * it can be changed since the last checking.
|
|
0
|
699 */
|
|
|
700
|
|
|
701 name[0] = CTL_KERN;
|
|
|
702 name[1] = KERN_RTSIGMAX;
|
|
|
703 len = sizeof(rtsig_max);
|
|
42
|
704
|
|
|
705 if (sysctl(name, 2, &rtsig_max, &len, NULL, 0) == -1) {
|
|
0
|
706 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
707 "sysctl(KERN_RTSIGMAX) failed");
|
|
|
708 return NGX_ERROR;
|
|
|
709 }
|
|
|
710
|
|
42
|
711 /* name[0] = CTL_KERN; */
|
|
0
|
712 name[1] = KERN_RTSIGNR;
|
|
|
713 len = sizeof(rtsig_nr);
|
|
42
|
714
|
|
|
715 if (sysctl(name, 2, &rtsig_nr, &len, NULL, 0) == -1) {
|
|
0
|
716 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
717 "sysctl(KERN_RTSIGNR) failed");
|
|
|
718 return NGX_ERROR;
|
|
|
719 }
|
|
|
720
|
|
|
721 /*
|
|
|
722 * drain the rt signal queue if the /proc/sys/kernel/rtsig-nr
|
|
|
723 * is bigger than
|
|
|
724 * /proc/sys/kernel/rtsig-max / rtsig_overflow_threshold
|
|
|
725 */
|
|
|
726
|
|
|
727 if (rtsig_max / rtscf->overflow_threshold < rtsig_nr) {
|
|
|
728 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
729 "rtsig queue state: %d/%d",
|
|
|
730 rtsig_nr, rtsig_max);
|
|
|
731 while (ngx_rtsig_process_events(cycle) == NGX_OK) {
|
|
|
732 /* void */
|
|
|
733 }
|
|
|
734 }
|
|
|
735
|
|
|
736 } else {
|
|
|
737
|
|
|
738 /*
|
|
|
739 * Linux has not KERN_RTSIGMAX since 2.6.6-mm2
|
|
|
740 * so drain the rt signal queue unconditionally
|
|
|
741 */
|
|
|
742
|
|
|
743 while (ngx_rtsig_process_events(cycle) == NGX_OK) { /* void */ }
|
|
|
744 }
|
|
|
745
|
|
|
746 tested = 0;
|
|
|
747 }
|
|
|
748 }
|
|
|
749
|
|
|
750 if (ngx_posted_events) {
|
|
|
751 if (ngx_threaded) {
|
|
|
752 ngx_wakeup_worker_thread(cycle);
|
|
|
753
|
|
|
754 } else {
|
|
|
755 ngx_event_process_posted(cycle);
|
|
|
756 }
|
|
|
757 }
|
|
|
758
|
|
|
759 ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
|
|
|
760 "rt signal queue overflow recovered");
|
|
|
761
|
|
|
762 overflow = 0;
|
|
|
763 ngx_event_actions.process_events = ngx_rtsig_process_events;
|
|
|
764
|
|
|
765 return NGX_OK;
|
|
|
766 }
|
|
|
767
|
|
|
768
|
|
|
769 static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle)
|
|
|
770 {
|
|
|
771 ngx_rtsig_conf_t *rtscf;
|
|
|
772
|
|
|
773 ngx_test_null(rtscf, ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t)),
|
|
|
774 NGX_CONF_ERROR);
|
|
|
775
|
|
|
776 rtscf->signo = NGX_CONF_UNSET;
|
|
|
777 rtscf->overflow_events = NGX_CONF_UNSET;
|
|
|
778 rtscf->overflow_test = NGX_CONF_UNSET;
|
|
|
779 rtscf->overflow_threshold = NGX_CONF_UNSET;
|
|
|
780
|
|
|
781 return rtscf;
|
|
|
782 }
|
|
|
783
|
|
|
784
|
|
|
785 static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
|
786 {
|
|
|
787 ngx_rtsig_conf_t *rtscf = conf;
|
|
|
788
|
|
|
789 /* LinuxThreads use the first 3 RT signals */
|
|
|
790 ngx_conf_init_value(rtscf->signo, SIGRTMIN + 10);
|
|
|
791
|
|
|
792 ngx_conf_init_value(rtscf->overflow_events, 16);
|
|
|
793 ngx_conf_init_value(rtscf->overflow_test, 32);
|
|
|
794 ngx_conf_init_value(rtscf->overflow_threshold, 10);
|
|
|
795
|
|
|
796 return NGX_CONF_OK;
|
|
|
797 }
|
|
|
798
|
|
|
799
|
|
|
800 static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
|
|
|
801 void *post, void *data)
|
|
|
802 {
|
|
|
803 if (ngx_linux_rtsig_max) {
|
|
|
804 return ngx_conf_check_num_bounds(cf, post, data);
|
|
|
805 }
|
|
|
806
|
|
|
807 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
|
|
808 "\"rtsig_overflow_threshold\" is not supported "
|
|
|
809 "since Linux 2.6.6-mm2, ignored");
|
|
|
810
|
|
|
811 return NGX_CONF_OK;
|
|
|
812 }
|
