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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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48
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51 void *post, void *data);
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0
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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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48
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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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0
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74
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48
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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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0
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81
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48
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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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0
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88
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48
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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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0
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95
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48
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96 ngx_null_command
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0
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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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48
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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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0
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127 };
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128
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129
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48
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130 static ngx_int_t
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131 ngx_rtsig_init(ngx_cycle_t *cycle)
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0
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132 {
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133 ngx_rtsig_conf_t *rtscf;
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134
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135 rtscf = ngx_event_get_conf(cycle->conf_ctx, ngx_rtsig_module);
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136
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137 sigemptyset(&set);
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138 sigaddset(&set, rtscf->signo);
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139 sigaddset(&set, rtscf->signo + 1);
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140 sigaddset(&set, SIGIO);
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141
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142 if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
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143 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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144 "sigprocmask() failed");
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145 return NGX_ERROR;
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146 }
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147
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148 if (overflow_list) {
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149 ngx_free(overflow_list);
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150 }
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151
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152 overflow_list = ngx_alloc(sizeof(struct pollfd) * rtscf->overflow_events,
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153 cycle->log);
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154 if (overflow_list == NULL) {
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155 return NGX_ERROR;
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156 }
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157
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158 ngx_io = ngx_os_io;
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159
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160 ngx_event_actions = ngx_rtsig_module_ctx.actions;
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161
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4
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162 ngx_event_flags = NGX_USE_RTSIG_EVENT|NGX_USE_GREEDY_EVENT;
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0
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163
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164 return NGX_OK;
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165 }
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166
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167
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48
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168 static void
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169 ngx_rtsig_done(ngx_cycle_t *cycle)
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0
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170 {
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2
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171 ngx_free(overflow_list);
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172
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173 overflow_list = NULL;
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0
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174 }
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175
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176
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48
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177 static ngx_int_t
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178 ngx_rtsig_add_connection(ngx_connection_t *c)
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0
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179 {
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180 int signo;
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181 ngx_rtsig_conf_t *rtscf;
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182
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183 if (c->read->accept && c->read->disabled) {
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184
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185 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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186 "rtsig enable connection: fd:%d", c->fd);
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187
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188 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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189 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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190 "fcntl(F_SETOWN) failed");
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191 return NGX_ERROR;
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192 }
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193
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194 c->read->active = 1;
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195 c->read->disabled = 0;
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196 }
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197
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198 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
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199
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200 signo = rtscf->signo + c->read->instance;
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201
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202 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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203 "rtsig add connection: fd:%d signo:%d", c->fd, signo);
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204
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205 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) == -1) {
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206 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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207 "fcntl(O_RDWR|O_NONBLOCK|O_ASYNC) failed");
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208 return NGX_ERROR;
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209 }
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210
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211 if (fcntl(c->fd, F_SETSIG, signo) == -1) {
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212 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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213 "fcntl(F_SETSIG) failed");
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214 return NGX_ERROR;
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215 }
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216
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217 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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218 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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219 "fcntl(F_SETOWN) failed");
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220 return NGX_ERROR;
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221 }
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222
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18
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223 #if (NGX_HAVE_ONESIGFD)
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224 if (fcntl(c->fd, F_SETAUXFL, O_ONESIGFD) == -1) {
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225 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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226 "fcntl(F_SETAUXFL) failed");
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227 return NGX_ERROR;
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228 }
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229 #endif
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230
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231 c->read->active = 1;
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232 c->write->active = 1;
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233
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234 return NGX_OK;
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235 }
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236
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237
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48
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238 static ngx_int_t
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239 ngx_rtsig_del_connection(ngx_connection_t *c, u_int flags)
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0
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240 {
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241 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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242 "rtsig del connection: fd:%d", c->fd);
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243
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244 if ((flags & NGX_DISABLE_EVENT) && c->read->accept) {
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245
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246 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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247 "rtsig disable connection: fd:%d", c->fd);
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248
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249 c->read->active = 0;
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250 c->read->disabled = 1;
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251 return NGX_OK;
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252 }
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253
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254 if (flags & NGX_CLOSE_EVENT) {
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255 c->read->active = 0;
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256 c->write->active = 0;
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257 return NGX_OK;
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258 }
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259
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260 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK) == -1) {
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261 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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262 "fcntl(O_RDWR|O_NONBLOCK) failed");
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263 return NGX_ERROR;
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264 }
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265
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266 c->read->active = 0;
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267 c->write->active = 0;
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268
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269 return NGX_OK;
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270 }
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271
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272
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48
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273 static ngx_int_t
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274 ngx_rtsig_process_events(ngx_cycle_t *cycle)
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0
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275 {
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276 int signo;
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277 ngx_int_t instance, i;
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278 ngx_uint_t expire;
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279 size_t n;
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280 ngx_msec_t timer;
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281 ngx_err_t err;
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282 siginfo_t si;
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283 ngx_event_t *rev, *wev;
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284 struct timeval tv;
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285 struct timespec ts, *tp;
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286 struct sigaction sa;
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287 ngx_epoch_msec_t delta;
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288 ngx_connection_t *c;
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289 ngx_rtsig_conf_t *rtscf;
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290
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291 if (overflow) {
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292 timer = 0;
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293 expire = 0;
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294
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295 } else {
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296 for ( ;; ) {
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297 timer = ngx_event_find_timer();
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298
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299 #if (NGX_THREADS)
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300
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301 if (timer == NGX_TIMER_ERROR) {
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302 return NGX_ERROR;
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303 }
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304
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305 if (timer == NGX_TIMER_INFINITE || timer > 500) {
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306 timer = 500;
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307 break;
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308 }
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309
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310 #endif
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311
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312 if (timer != 0) {
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313 break;
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314 }
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315
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316 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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317 "rtsig expired timer");
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318
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319 ngx_event_expire_timers((ngx_msec_t)
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320 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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321
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322 if (ngx_posted_events && ngx_threaded) {
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323 ngx_wakeup_worker_thread(cycle);
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324 }
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325 }
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326
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327 expire = 1;
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328
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329 if (ngx_accept_mutex) {
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330 if (ngx_accept_disabled > 0) {
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331 ngx_accept_disabled--;
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332
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333 } else {
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334 ngx_accept_mutex_held = 0;
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335
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336 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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337 return NGX_ERROR;
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338 }
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339
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340 if (ngx_accept_mutex_held == 0
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341 && (timer == NGX_TIMER_INFINITE
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342 || timer > ngx_accept_mutex_delay))
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343 {
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344 timer = ngx_accept_mutex_delay;
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345 expire = 0;
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346 }
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347 }
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348 }
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349 }
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350
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351 if (timer == NGX_TIMER_INFINITE) {
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352 tp = NULL;
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353 expire = 0;
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354
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355 } else {
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356 ts.tv_sec = timer / 1000;
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357 ts.tv_nsec = (timer % 1000) * 1000000;
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358 tp = &ts;
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359 }
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360
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361 ngx_old_elapsed_msec = ngx_elapsed_msec;
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362
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363 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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364 "rtsig timer: %d", timer);
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365
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366 /* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
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367
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368 signo = sigtimedwait(&set, &si, tp);
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369
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370 if (signo == -1) {
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371 err = ngx_errno;
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372
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373 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
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374 "rtsig signo:%d", signo);
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375
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376 if (err == NGX_EAGAIN) {
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377
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378 if (timer == NGX_TIMER_INFINITE) {
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379 ngx_accept_mutex_unlock();
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380 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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381 "sigtimedwait() returned EAGAIN without timeout");
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382 return NGX_ERROR;
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383 }
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384
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385 err = 0;
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386 }
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387
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388 } else {
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389 err = 0;
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390 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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391 "rtsig signo:%d fd:%d band:%04Xd",
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0
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392 signo, si.si_fd, si.si_band);
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393 }
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394
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395 ngx_gettimeofday(&tv);
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396 ngx_time_update(tv.tv_sec);
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397
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398 delta = ngx_elapsed_msec;
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399 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
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400 + tv.tv_usec / 1000 - ngx_start_msec;
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401
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402 if (err) {
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403 ngx_accept_mutex_unlock();
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404 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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405 cycle->log, err, "sigtimedwait() failed");
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|
406 return NGX_ERROR;
|
|
|
407 }
|
|
|
408
|
|
|
409 if (timer != NGX_TIMER_INFINITE) {
|
|
|
410 delta = ngx_elapsed_msec - delta;
|
|
|
411
|
|
|
412 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
413 "rtsig timer: %d, delta: %d", timer, (int) delta);
|
|
|
414 }
|
|
|
415
|
|
|
416 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
|
417
|
|
|
418 if (signo == rtscf->signo || signo == rtscf->signo + 1) {
|
|
|
419
|
|
|
420 if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
|
|
|
421 return NGX_OK;
|
|
|
422 }
|
|
|
423
|
|
|
424 /* TODO: old_cycles */
|
|
|
425
|
|
|
426 c = &ngx_cycle->connections[si.si_fd];
|
|
|
427
|
|
|
428 instance = signo - rtscf->signo;
|
|
|
429
|
|
|
430 rev = c->read;
|
|
|
431
|
|
|
432 if (c->read->instance != instance) {
|
|
|
433
|
|
|
434 /*
|
|
|
435 * the stale event from a file descriptor
|
|
|
436 * that was just closed in this iteration
|
|
|
437 */
|
|
|
438
|
|
|
439 ngx_accept_mutex_unlock();
|
|
|
440
|
|
|
441 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
442 "rtsig: stale event %p", c);
|
|
0
|
443
|
|
|
444 return NGX_OK;
|
|
|
445 }
|
|
|
446
|
|
|
447 if (si.si_band & (POLLIN|POLLHUP|POLLERR)) {
|
|
|
448 if (rev->active) {
|
|
|
449
|
|
|
450 if (ngx_threaded && !rev->accept) {
|
|
|
451 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
452 ngx_accept_mutex_unlock();
|
|
|
453 return NGX_ERROR;
|
|
|
454 }
|
|
|
455
|
|
|
456 rev->posted_ready = 1;
|
|
|
457 ngx_post_event(rev);
|
|
|
458
|
|
|
459 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
460
|
|
|
461 } else {
|
|
|
462 rev->ready = 1;
|
|
|
463
|
|
|
464 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
|
465 rev->event_handler(rev);
|
|
|
466
|
|
|
467 } else if (rev->accept) {
|
|
|
468 if (ngx_accept_disabled <= 0) {
|
|
|
469 rev->event_handler(rev);
|
|
|
470 }
|
|
|
471
|
|
|
472 } else {
|
|
|
473 ngx_post_event(rev);
|
|
|
474 }
|
|
|
475 }
|
|
|
476 }
|
|
|
477 }
|
|
|
478
|
|
|
479 wev = c->write;
|
|
|
480
|
|
|
481 if (si.si_band & (POLLOUT|POLLHUP|POLLERR)) {
|
|
|
482 if (wev->active) {
|
|
|
483
|
|
|
484 if (ngx_threaded) {
|
|
|
485 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
486 ngx_accept_mutex_unlock();
|
|
|
487 return NGX_ERROR;
|
|
|
488 }
|
|
|
489
|
|
|
490 wev->posted_ready = 1;
|
|
|
491 ngx_post_event(wev);
|
|
|
492
|
|
|
493 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
494
|
|
|
495 } else {
|
|
|
496 wev->ready = 1;
|
|
|
497
|
|
|
498 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
|
499 wev->event_handler(wev);
|
|
|
500
|
|
|
501 } else {
|
|
|
502 ngx_post_event(wev);
|
|
|
503 }
|
|
|
504 }
|
|
|
505 }
|
|
|
506 }
|
|
|
507
|
|
|
508 } else if (signo == SIGIO) {
|
|
|
509 ngx_accept_mutex_unlock();
|
|
|
510
|
|
|
511 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
512 "rt signal queue overflowed");
|
|
|
513
|
|
|
514 /* flush the RT signal queue */
|
|
|
515
|
|
|
516 ngx_memzero(&sa, sizeof(struct sigaction));
|
|
|
517 sa.sa_handler = SIG_DFL;
|
|
|
518 sigemptyset(&sa.sa_mask);
|
|
|
519
|
|
|
520 if (sigaction(rtscf->signo, &sa, NULL) == -1) {
|
|
|
521 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
522 "sigaction(%d, SIG_DFL) failed", rtscf->signo);
|
|
|
523 }
|
|
|
524
|
|
|
525 if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
|
|
|
526 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
527 "sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
|
|
|
528 }
|
|
|
529
|
|
|
530 overflow = 1;
|
|
|
531 overflow_current = 0;
|
|
|
532 ngx_event_actions.process_events = ngx_rtsig_process_overflow;
|
|
|
533
|
|
|
534 return NGX_ERROR;
|
|
|
535
|
|
|
536 } else if (signo != -1) {
|
|
|
537 ngx_accept_mutex_unlock();
|
|
|
538
|
|
|
539 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
540 "sigtimedwait() returned unexpected signal: %d", signo);
|
|
|
541
|
|
|
542 return NGX_ERROR;
|
|
|
543 }
|
|
|
544
|
|
|
545 ngx_accept_mutex_unlock();
|
|
|
546
|
|
|
547 if (expire && delta) {
|
|
|
548 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
|
549 }
|
|
|
550
|
|
|
551 if (ngx_posted_events) {
|
|
|
552 if (ngx_threaded) {
|
|
|
553 ngx_wakeup_worker_thread(cycle);
|
|
|
554
|
|
|
555 } else {
|
|
|
556 ngx_event_process_posted(cycle);
|
|
|
557 }
|
|
|
558 }
|
|
|
559
|
|
|
560 if (signo == -1) {
|
|
|
561 return NGX_AGAIN;
|
|
|
562 } else {
|
|
|
563 return NGX_OK;
|
|
|
564 }
|
|
|
565 }
|
|
|
566
|
|
|
567
|
|
|
568 /* TODO: old cylces */
|
|
|
569
|
|
48
|
570 static ngx_int_t
|
|
|
571 ngx_rtsig_process_overflow(ngx_cycle_t *cycle)
|
|
0
|
572 {
|
|
|
573 int name[2], rtsig_max, rtsig_nr, events, ready;
|
|
|
574 size_t len;
|
|
|
575 ngx_int_t tested, n, i;
|
|
|
576 ngx_err_t err;
|
|
|
577 ngx_event_t *rev, *wev;
|
|
|
578 ngx_connection_t *c;
|
|
|
579 ngx_rtsig_conf_t *rtscf;
|
|
|
580
|
|
|
581 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
|
582
|
|
|
583 tested = 0;
|
|
|
584
|
|
|
585 for ( ;; ) {
|
|
|
586
|
|
|
587 n = 0;
|
|
|
588 while (n < rtscf->overflow_events) {
|
|
|
589
|
|
|
590 if (overflow_current == cycle->connection_n) {
|
|
|
591 break;
|
|
|
592 }
|
|
|
593
|
|
|
594 c = &cycle->connections[overflow_current++];
|
|
|
595
|
|
|
596 if (c->fd == -1) {
|
|
|
597 continue;
|
|
|
598 }
|
|
|
599
|
|
|
600 events = 0;
|
|
|
601
|
|
|
602 if (c->read->active && c->read->event_handler) {
|
|
|
603 events |= POLLIN;
|
|
|
604 }
|
|
|
605
|
|
|
606 if (c->write->active && c->write->event_handler) {
|
|
|
607 events |= POLLOUT;
|
|
|
608 }
|
|
|
609
|
|
|
610 if (events == 0) {
|
|
|
611 continue;
|
|
|
612 }
|
|
|
613
|
|
|
614 overflow_list[n].fd = c->fd;
|
|
|
615 overflow_list[n].events = events;
|
|
|
616 overflow_list[n].revents = 0;
|
|
|
617 n++;
|
|
|
618 }
|
|
|
619
|
|
|
620 if (n == 0) {
|
|
|
621 break;
|
|
|
622 }
|
|
|
623
|
|
|
624 for ( ;; ) {
|
|
|
625 ready = poll(overflow_list, n, 0);
|
|
|
626
|
|
|
627 if (ready == -1) {
|
|
|
628 err = ngx_errno;
|
|
|
629 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
630 cycle->log, 0,
|
|
|
631 "poll() failed while the overflow recover");
|
|
|
632
|
|
|
633 if (err == NGX_EINTR) {
|
|
|
634 continue;
|
|
|
635 }
|
|
|
636 }
|
|
|
637
|
|
|
638 break;
|
|
|
639 }
|
|
|
640
|
|
|
641 if (ready <= 0) {
|
|
|
642 continue;
|
|
|
643 }
|
|
|
644
|
|
|
645 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
646 return NGX_ERROR;
|
|
|
647 }
|
|
|
648
|
|
|
649 for (i = 0; i < n; i++) {
|
|
|
650 c = &cycle->connections[overflow_list[i].fd];
|
|
|
651
|
|
|
652 rev = c->read;
|
|
|
653
|
|
|
654 if (rev->active
|
|
|
655 && !rev->closed
|
|
|
656 && rev->event_handler
|
|
|
657 && (overflow_list[i].revents
|
|
|
658 & (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
659 {
|
|
|
660 tested++;
|
|
|
661
|
|
|
662 if (ngx_threaded) {
|
|
|
663 rev->posted_ready = 1;
|
|
|
664 ngx_post_event(rev);
|
|
|
665
|
|
|
666 } else {
|
|
|
667 rev->ready = 1;
|
|
|
668 rev->event_handler(rev);
|
|
|
669 }
|
|
|
670 }
|
|
|
671
|
|
|
672 wev = c->write;
|
|
|
673
|
|
|
674 if (wev->active
|
|
|
675 && !wev->closed
|
|
|
676 && wev->event_handler
|
|
|
677 && (overflow_list[i].revents
|
|
|
678 & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
679 {
|
|
|
680 tested++;
|
|
|
681
|
|
|
682 if (ngx_threaded) {
|
|
|
683 wev->posted_ready = 1;
|
|
|
684 ngx_post_event(wev);
|
|
|
685
|
|
|
686 } else {
|
|
|
687 wev->ready = 1;
|
|
|
688 wev->event_handler(wev);
|
|
|
689 }
|
|
|
690 }
|
|
|
691 }
|
|
|
692
|
|
|
693 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
694
|
|
|
695 if (tested >= rtscf->overflow_test) {
|
|
|
696
|
|
|
697 if (ngx_linux_rtsig_max) {
|
|
|
698
|
|
|
699 /*
|
|
|
700 * Check the current rt queue length to prevent
|
|
|
701 * the new overflow.
|
|
|
702 *
|
|
|
703 * Learn the /proc/sys/kernel/rtsig-max value because
|
|
2
|
704 * it can be changed since the last checking.
|
|
0
|
705 */
|
|
|
706
|
|
|
707 name[0] = CTL_KERN;
|
|
|
708 name[1] = KERN_RTSIGMAX;
|
|
|
709 len = sizeof(rtsig_max);
|
|
42
|
710
|
|
|
711 if (sysctl(name, 2, &rtsig_max, &len, NULL, 0) == -1) {
|
|
0
|
712 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
713 "sysctl(KERN_RTSIGMAX) failed");
|
|
|
714 return NGX_ERROR;
|
|
|
715 }
|
|
|
716
|
|
42
|
717 /* name[0] = CTL_KERN; */
|
|
0
|
718 name[1] = KERN_RTSIGNR;
|
|
|
719 len = sizeof(rtsig_nr);
|
|
42
|
720
|
|
|
721 if (sysctl(name, 2, &rtsig_nr, &len, NULL, 0) == -1) {
|
|
0
|
722 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
723 "sysctl(KERN_RTSIGNR) failed");
|
|
|
724 return NGX_ERROR;
|
|
|
725 }
|
|
|
726
|
|
|
727 /*
|
|
|
728 * drain the rt signal queue if the /proc/sys/kernel/rtsig-nr
|
|
|
729 * is bigger than
|
|
|
730 * /proc/sys/kernel/rtsig-max / rtsig_overflow_threshold
|
|
|
731 */
|
|
|
732
|
|
|
733 if (rtsig_max / rtscf->overflow_threshold < rtsig_nr) {
|
|
|
734 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
735 "rtsig queue state: %d/%d",
|
|
|
736 rtsig_nr, rtsig_max);
|
|
|
737 while (ngx_rtsig_process_events(cycle) == NGX_OK) {
|
|
|
738 /* void */
|
|
|
739 }
|
|
|
740 }
|
|
|
741
|
|
|
742 } else {
|
|
|
743
|
|
|
744 /*
|
|
|
745 * Linux has not KERN_RTSIGMAX since 2.6.6-mm2
|
|
|
746 * so drain the rt signal queue unconditionally
|
|
|
747 */
|
|
|
748
|
|
|
749 while (ngx_rtsig_process_events(cycle) == NGX_OK) { /* void */ }
|
|
|
750 }
|
|
|
751
|
|
|
752 tested = 0;
|
|
|
753 }
|
|
|
754 }
|
|
|
755
|
|
|
756 if (ngx_posted_events) {
|
|
|
757 if (ngx_threaded) {
|
|
|
758 ngx_wakeup_worker_thread(cycle);
|
|
|
759
|
|
|
760 } else {
|
|
|
761 ngx_event_process_posted(cycle);
|
|
|
762 }
|
|
|
763 }
|
|
|
764
|
|
|
765 ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
|
|
|
766 "rt signal queue overflow recovered");
|
|
|
767
|
|
|
768 overflow = 0;
|
|
|
769 ngx_event_actions.process_events = ngx_rtsig_process_events;
|
|
|
770
|
|
|
771 return NGX_OK;
|
|
|
772 }
|
|
|
773
|
|
|
774
|
|
48
|
775 static void *
|
|
|
776 ngx_rtsig_create_conf(ngx_cycle_t *cycle)
|
|
0
|
777 {
|
|
|
778 ngx_rtsig_conf_t *rtscf;
|
|
|
779
|
|
|
780 ngx_test_null(rtscf, ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t)),
|
|
|
781 NGX_CONF_ERROR);
|
|
|
782
|
|
|
783 rtscf->signo = NGX_CONF_UNSET;
|
|
|
784 rtscf->overflow_events = NGX_CONF_UNSET;
|
|
|
785 rtscf->overflow_test = NGX_CONF_UNSET;
|
|
|
786 rtscf->overflow_threshold = NGX_CONF_UNSET;
|
|
|
787
|
|
|
788 return rtscf;
|
|
|
789 }
|
|
|
790
|
|
|
791
|
|
48
|
792 static char *
|
|
|
793 ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
794 {
|
|
|
795 ngx_rtsig_conf_t *rtscf = conf;
|
|
|
796
|
|
|
797 /* LinuxThreads use the first 3 RT signals */
|
|
|
798 ngx_conf_init_value(rtscf->signo, SIGRTMIN + 10);
|
|
|
799
|
|
|
800 ngx_conf_init_value(rtscf->overflow_events, 16);
|
|
|
801 ngx_conf_init_value(rtscf->overflow_test, 32);
|
|
|
802 ngx_conf_init_value(rtscf->overflow_threshold, 10);
|
|
|
803
|
|
|
804 return NGX_CONF_OK;
|
|
|
805 }
|
|
|
806
|
|
|
807
|
|
48
|
808 static char *
|
|
|
809 ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
|
|
0
|
810 void *post, void *data)
|
|
|
811 {
|
|
|
812 if (ngx_linux_rtsig_max) {
|
|
|
813 return ngx_conf_check_num_bounds(cf, post, data);
|
|
|
814 }
|
|
|
815
|
|
|
816 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
|
|
817 "\"rtsig_overflow_threshold\" is not supported "
|
|
|
818 "since Linux 2.6.6-mm2, ignored");
|
|
|
819
|
|
|
820 return NGX_CONF_OK;
|
|
|
821 }
|
