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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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660
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4 * Copyright (C) Nginx, Inc.
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0
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11
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12
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18
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13 #if (NGX_TEST_BUILD_RTSIG)
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0
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14
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370
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15 #ifdef SIGRTMIN
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16 #define si_fd _reason.__spare__.__spare2__[0]
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17 #else
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18 #define SIGRTMIN 33
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19 #define si_fd __spare__[0]
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20 #endif
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21
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0
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22 #define F_SETSIG 10
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23 #define KERN_RTSIGNR 30
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24 #define KERN_RTSIGMAX 31
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25
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26 int sigtimedwait(const sigset_t *set, siginfo_t *info,
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27 const struct timespec *timeout)
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28 {
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29 return -1;
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30 }
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31
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32 int ngx_linux_rtsig_max;
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33
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34 #endif
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35
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36
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37 typedef struct {
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324
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38 ngx_uint_t signo;
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39 ngx_uint_t overflow_events;
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40 ngx_uint_t overflow_test;
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41 ngx_uint_t overflow_threshold;
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0
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42 } ngx_rtsig_conf_t;
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43
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44
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45 extern ngx_event_module_t ngx_poll_module_ctx;
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46
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112
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47 static ngx_int_t ngx_rtsig_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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0
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48 static void ngx_rtsig_done(ngx_cycle_t *cycle);
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49 static ngx_int_t ngx_rtsig_add_connection(ngx_connection_t *c);
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324
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50 static ngx_int_t ngx_rtsig_del_connection(ngx_connection_t *c,
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51 ngx_uint_t flags);
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112
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52 static ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle,
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53 ngx_msec_t timer, ngx_uint_t flags);
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54 static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle,
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55 ngx_msec_t timer, ngx_uint_t flags);
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0
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56
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57 static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle);
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58 static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf);
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59 static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
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48
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60 void *post, void *data);
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0
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61
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62
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63 static sigset_t set;
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64 static ngx_uint_t overflow, overflow_current;
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65 static struct pollfd *overflow_list;
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66
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67
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68 static ngx_str_t rtsig_name = ngx_string("rtsig");
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69
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70 static ngx_conf_num_bounds_t ngx_overflow_threshold_bounds = {
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71 ngx_check_ngx_overflow_threshold_bounds, 2, 10
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72 };
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73
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74
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75 static ngx_command_t ngx_rtsig_commands[] = {
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76
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48
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77 { ngx_string("rtsig_signo"),
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78 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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79 ngx_conf_set_num_slot,
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80 0,
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81 offsetof(ngx_rtsig_conf_t, signo),
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82 NULL },
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0
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83
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48
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84 { ngx_string("rtsig_overflow_events"),
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85 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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86 ngx_conf_set_num_slot,
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87 0,
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88 offsetof(ngx_rtsig_conf_t, overflow_events),
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89 NULL },
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0
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90
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48
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91 { ngx_string("rtsig_overflow_test"),
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92 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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93 ngx_conf_set_num_slot,
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94 0,
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95 offsetof(ngx_rtsig_conf_t, overflow_test),
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96 NULL },
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0
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97
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48
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98 { ngx_string("rtsig_overflow_threshold"),
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99 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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100 ngx_conf_set_num_slot,
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101 0,
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102 offsetof(ngx_rtsig_conf_t, overflow_threshold),
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103 &ngx_overflow_threshold_bounds },
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0
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104
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48
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105 ngx_null_command
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0
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106 };
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107
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108
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109 ngx_event_module_t ngx_rtsig_module_ctx = {
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110 &rtsig_name,
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111 ngx_rtsig_create_conf, /* create configuration */
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112 ngx_rtsig_init_conf, /* init configuration */
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113
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114 {
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115 NULL, /* add an event */
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116 NULL, /* delete an event */
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117 NULL, /* enable an event */
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118 NULL, /* disable an event */
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119 ngx_rtsig_add_connection, /* add an connection */
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120 ngx_rtsig_del_connection, /* delete an connection */
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121 NULL, /* process the changes */
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122 ngx_rtsig_process_events, /* process the events */
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123 ngx_rtsig_init, /* init the events */
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124 ngx_rtsig_done, /* done the events */
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125 }
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126
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127 };
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128
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129 ngx_module_t ngx_rtsig_module = {
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58
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130 NGX_MODULE_V1,
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0
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131 &ngx_rtsig_module_ctx, /* module context */
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132 ngx_rtsig_commands, /* module directives */
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48
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133 NGX_EVENT_MODULE, /* module type */
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90
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134 NULL, /* init master */
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48
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135 NULL, /* init module */
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90
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136 NULL, /* init process */
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137 NULL, /* init thread */
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138 NULL, /* exit thread */
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139 NULL, /* exit process */
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140 NULL, /* exit master */
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141 NGX_MODULE_V1_PADDING
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0
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142 };
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143
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144
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48
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145 static ngx_int_t
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112
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146 ngx_rtsig_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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0
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147 {
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148 ngx_rtsig_conf_t *rtscf;
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149
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150 rtscf = ngx_event_get_conf(cycle->conf_ctx, ngx_rtsig_module);
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151
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152 sigemptyset(&set);
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324
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153 sigaddset(&set, (int) rtscf->signo);
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154 sigaddset(&set, (int) rtscf->signo + 1);
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0
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155 sigaddset(&set, SIGIO);
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112
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156 sigaddset(&set, SIGALRM);
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0
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157
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158 if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
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159 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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160 "sigprocmask() failed");
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161 return NGX_ERROR;
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162 }
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163
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164 if (overflow_list) {
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165 ngx_free(overflow_list);
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166 }
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167
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168 overflow_list = ngx_alloc(sizeof(struct pollfd) * rtscf->overflow_events,
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169 cycle->log);
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170 if (overflow_list == NULL) {
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171 return NGX_ERROR;
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172 }
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173
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174 ngx_io = ngx_os_io;
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175
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176 ngx_event_actions = ngx_rtsig_module_ctx.actions;
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177
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92
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178 ngx_event_flags = NGX_USE_RTSIG_EVENT
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179 |NGX_USE_GREEDY_EVENT
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180 |NGX_USE_FD_EVENT;
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0
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181
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182 return NGX_OK;
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183 }
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184
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185
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48
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186 static void
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187 ngx_rtsig_done(ngx_cycle_t *cycle)
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0
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188 {
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2
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189 ngx_free(overflow_list);
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190
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191 overflow_list = NULL;
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0
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192 }
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193
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194
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48
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195 static ngx_int_t
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196 ngx_rtsig_add_connection(ngx_connection_t *c)
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0
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197 {
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324
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198 ngx_uint_t signo;
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0
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199 ngx_rtsig_conf_t *rtscf;
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200
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201 if (c->read->accept && c->read->disabled) {
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202
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203 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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204 "rtsig enable connection: fd:%d", c->fd);
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205
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206 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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207 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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208 "fcntl(F_SETOWN) failed");
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209 return NGX_ERROR;
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210 }
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211
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212 c->read->active = 1;
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213 c->read->disabled = 0;
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214 }
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215
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216 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
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217
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218 signo = rtscf->signo + c->read->instance;
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219
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220 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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324
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221 "rtsig add connection: fd:%d signo:%ui", c->fd, signo);
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0
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222
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223 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) == -1) {
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224 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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225 "fcntl(O_RDWR|O_NONBLOCK|O_ASYNC) failed");
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226 return NGX_ERROR;
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227 }
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228
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324
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229 if (fcntl(c->fd, F_SETSIG, (int) signo) == -1) {
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0
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230 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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231 "fcntl(F_SETSIG) failed");
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232 return NGX_ERROR;
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233 }
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234
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235 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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236 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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237 "fcntl(F_SETOWN) failed");
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238 return NGX_ERROR;
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239 }
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240
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18
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241 #if (NGX_HAVE_ONESIGFD)
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0
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242 if (fcntl(c->fd, F_SETAUXFL, O_ONESIGFD) == -1) {
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243 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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244 "fcntl(F_SETAUXFL) failed");
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245 return NGX_ERROR;
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246 }
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247 #endif
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248
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249 c->read->active = 1;
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250 c->write->active = 1;
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251
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252 return NGX_OK;
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253 }
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254
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255
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48
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256 static ngx_int_t
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324
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257 ngx_rtsig_del_connection(ngx_connection_t *c, ngx_uint_t flags)
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0
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258 {
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259 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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260 "rtsig del connection: fd:%d", c->fd);
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261
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262 if ((flags & NGX_DISABLE_EVENT) && c->read->accept) {
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263
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264 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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265 "rtsig disable connection: fd:%d", c->fd);
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266
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267 c->read->active = 0;
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268 c->read->disabled = 1;
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269 return NGX_OK;
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270 }
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271
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272 if (flags & NGX_CLOSE_EVENT) {
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273 c->read->active = 0;
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274 c->write->active = 0;
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275 return NGX_OK;
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276 }
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277
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278 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK) == -1) {
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279 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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280 "fcntl(O_RDWR|O_NONBLOCK) failed");
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281 return NGX_ERROR;
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282 }
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283
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284 c->read->active = 0;
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285 c->write->active = 0;
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286
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287 return NGX_OK;
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288 }
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289
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290
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48
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291 static ngx_int_t
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112
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292 ngx_rtsig_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
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0
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293 {
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294 int signo;
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50
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295 ngx_int_t instance;
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0
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296 ngx_err_t err;
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297 siginfo_t si;
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122
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298 ngx_event_t *rev, *wev, **queue;
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0
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299 struct timespec ts, *tp;
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300 struct sigaction sa;
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301 ngx_connection_t *c;
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302 ngx_rtsig_conf_t *rtscf;
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303
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304 if (timer == NGX_TIMER_INFINITE) {
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305 tp = NULL;
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306
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307 } else {
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308 ts.tv_sec = timer / 1000;
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309 ts.tv_nsec = (timer % 1000) * 1000000;
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310 tp = &ts;
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311 }
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312
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313 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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106
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314 "rtsig timer: %M", timer);
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0
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315
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316 /* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
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317
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318 signo = sigtimedwait(&set, &si, tp);
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319
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320 if (signo == -1) {
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321 err = ngx_errno;
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322
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323 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
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324 "rtsig signo:%d", signo);
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325
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116
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326 if (flags & NGX_UPDATE_TIME) {
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566
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327 ngx_time_update();
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0
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328 }
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329
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116
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330 if (err == NGX_EAGAIN) {
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331
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332 /* timeout */
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0
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333
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116
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334 if (timer != NGX_TIMER_INFINITE) {
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335 return NGX_AGAIN;
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336 }
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126
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337
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116
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338 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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339 "sigtimedwait() returned EAGAIN without timeout");
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340 return NGX_ERROR;
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341 }
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0
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342
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343 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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344 cycle->log, err, "sigtimedwait() failed");
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345 return NGX_ERROR;
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346 }
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347
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116
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348 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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349 "rtsig signo:%d fd:%d band:%04Xd",
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350 signo, si.si_fd, si.si_band);
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0
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351
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116
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352 if (flags & NGX_UPDATE_TIME) {
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566
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353 ngx_time_update();
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0
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354 }
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355
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356 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
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357
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324
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358 if (signo == (int) rtscf->signo || signo == (int) rtscf->signo + 1) {
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0
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359
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360 if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
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361 return NGX_OK;
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362 }
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363
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100
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364 c = ngx_cycle->files[si.si_fd];
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365
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366 if (c == NULL) {
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112
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367
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100
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368 /* the stale event */
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0
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369
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100
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370 return NGX_OK;
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371 }
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0
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372
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324
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373 instance = signo - (int) rtscf->signo;
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0
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374
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375 rev = c->read;
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376
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112
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377 if (rev->instance != instance) {
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0
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378
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379 /*
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380 * the stale event from a file descriptor
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381 * that was just closed in this iteration
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382 */
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383
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384 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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385 "rtsig: stale event %p", c);
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0
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386
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387 return NGX_OK;
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388 }
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389
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112
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390 if ((si.si_band & (POLLIN|POLLHUP|POLLERR)) && rev->active) {
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122
|
391
|
|
112
|
392 rev->ready = 1;
|
|
122
|
393
|
|
|
394 if (flags & NGX_POST_EVENTS) {
|
|
|
395 queue = (ngx_event_t **) (rev->accept ?
|
|
|
396 &ngx_posted_accept_events : &ngx_posted_events);
|
|
|
397
|
|
|
398 ngx_locked_post_event(rev, queue);
|
|
|
399
|
|
126
|
400 } else {
|
|
122
|
401 rev->handler(rev);
|
|
|
402 }
|
|
0
|
403 }
|
|
|
404
|
|
|
405 wev = c->write;
|
|
|
406
|
|
112
|
407 if ((si.si_band & (POLLOUT|POLLHUP|POLLERR)) && wev->active) {
|
|
122
|
408
|
|
112
|
409 wev->ready = 1;
|
|
122
|
410
|
|
|
411 if (flags & NGX_POST_EVENTS) {
|
|
|
412 ngx_locked_post_event(wev, &ngx_posted_events);
|
|
|
413
|
|
|
414 } else {
|
|
|
415 wev->handler(wev);
|
|
|
416 }
|
|
0
|
417 }
|
|
|
418
|
|
116
|
419 return NGX_OK;
|
|
|
420
|
|
112
|
421 } else if (signo == SIGALRM) {
|
|
|
422
|
|
566
|
423 ngx_time_update();
|
|
116
|
424
|
|
112
|
425 return NGX_OK;
|
|
|
426
|
|
0
|
427 } else if (signo == SIGIO) {
|
|
|
428
|
|
|
429 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
430 "rt signal queue overflowed");
|
|
|
431
|
|
|
432 /* flush the RT signal queue */
|
|
|
433
|
|
|
434 ngx_memzero(&sa, sizeof(struct sigaction));
|
|
|
435 sa.sa_handler = SIG_DFL;
|
|
|
436 sigemptyset(&sa.sa_mask);
|
|
|
437
|
|
|
438 if (sigaction(rtscf->signo, &sa, NULL) == -1) {
|
|
|
439 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
440 "sigaction(%d, SIG_DFL) failed", rtscf->signo);
|
|
|
441 }
|
|
|
442
|
|
|
443 if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
|
|
|
444 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
445 "sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
|
|
|
446 }
|
|
|
447
|
|
|
448 overflow = 1;
|
|
|
449 overflow_current = 0;
|
|
|
450 ngx_event_actions.process_events = ngx_rtsig_process_overflow;
|
|
|
451
|
|
|
452 return NGX_ERROR;
|
|
|
453
|
|
|
454 }
|
|
|
455
|
|
116
|
456 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
457 "sigtimedwait() returned unexpected signal: %d", signo);
|
|
0
|
458
|
|
116
|
459 return NGX_ERROR;
|
|
0
|
460 }
|
|
|
461
|
|
|
462
|
|
48
|
463 static ngx_int_t
|
|
112
|
464 ngx_rtsig_process_overflow(ngx_cycle_t *cycle, ngx_msec_t timer,
|
|
|
465 ngx_uint_t flags)
|
|
0
|
466 {
|
|
|
467 int name[2], rtsig_max, rtsig_nr, events, ready;
|
|
|
468 size_t len;
|
|
|
469 ngx_err_t err;
|
|
324
|
470 ngx_uint_t tested, n, i;
|
|
112
|
471 ngx_event_t *rev, *wev, **queue;
|
|
0
|
472 ngx_connection_t *c;
|
|
|
473 ngx_rtsig_conf_t *rtscf;
|
|
|
474
|
|
112
|
475 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
476 "rtsig process overflow");
|
|
|
477
|
|
0
|
478 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
|
479
|
|
|
480 tested = 0;
|
|
|
481
|
|
|
482 for ( ;; ) {
|
|
|
483
|
|
|
484 n = 0;
|
|
|
485 while (n < rtscf->overflow_events) {
|
|
|
486
|
|
|
487 if (overflow_current == cycle->connection_n) {
|
|
|
488 break;
|
|
|
489 }
|
|
|
490
|
|
92
|
491 c = cycle->files[overflow_current++];
|
|
0
|
492
|
|
108
|
493 if (c == NULL || c->fd == -1) {
|
|
0
|
494 continue;
|
|
|
495 }
|
|
|
496
|
|
|
497 events = 0;
|
|
|
498
|
|
58
|
499 if (c->read->active && c->read->handler) {
|
|
0
|
500 events |= POLLIN;
|
|
|
501 }
|
|
|
502
|
|
58
|
503 if (c->write->active && c->write->handler) {
|
|
0
|
504 events |= POLLOUT;
|
|
|
505 }
|
|
|
506
|
|
|
507 if (events == 0) {
|
|
|
508 continue;
|
|
|
509 }
|
|
|
510
|
|
|
511 overflow_list[n].fd = c->fd;
|
|
|
512 overflow_list[n].events = events;
|
|
|
513 overflow_list[n].revents = 0;
|
|
|
514 n++;
|
|
|
515 }
|
|
|
516
|
|
|
517 if (n == 0) {
|
|
|
518 break;
|
|
|
519 }
|
|
|
520
|
|
|
521 for ( ;; ) {
|
|
|
522 ready = poll(overflow_list, n, 0);
|
|
|
523
|
|
112
|
524 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
525 "rtsig overflow poll:%d", ready);
|
|
|
526
|
|
0
|
527 if (ready == -1) {
|
|
|
528 err = ngx_errno;
|
|
|
529 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
530 cycle->log, 0,
|
|
|
531 "poll() failed while the overflow recover");
|
|
|
532
|
|
|
533 if (err == NGX_EINTR) {
|
|
|
534 continue;
|
|
|
535 }
|
|
|
536 }
|
|
|
537
|
|
|
538 break;
|
|
|
539 }
|
|
|
540
|
|
|
541 if (ready <= 0) {
|
|
|
542 continue;
|
|
|
543 }
|
|
|
544
|
|
112
|
545 ngx_mutex_lock(ngx_posted_events_mutex);
|
|
0
|
546
|
|
|
547 for (i = 0; i < n; i++) {
|
|
92
|
548 c = cycle->files[overflow_list[i].fd];
|
|
0
|
549
|
|
108
|
550 if (c == NULL) {
|
|
|
551 continue;
|
|
|
552 }
|
|
|
553
|
|
0
|
554 rev = c->read;
|
|
|
555
|
|
|
556 if (rev->active
|
|
|
557 && !rev->closed
|
|
58
|
558 && rev->handler
|
|
0
|
559 && (overflow_list[i].revents
|
|
|
560 & (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
561 {
|
|
|
562 tested++;
|
|
|
563
|
|
112
|
564 if ((flags & NGX_POST_THREAD_EVENTS) && !rev->accept) {
|
|
0
|
565 rev->posted_ready = 1;
|
|
|
566
|
|
|
567 } else {
|
|
|
568 rev->ready = 1;
|
|
112
|
569 }
|
|
|
570
|
|
|
571 if (flags & NGX_POST_EVENTS) {
|
|
|
572 queue = (ngx_event_t **) (rev->accept ?
|
|
|
573 &ngx_posted_accept_events : &ngx_posted_events);
|
|
|
574
|
|
|
575 ngx_locked_post_event(rev, queue);
|
|
|
576
|
|
|
577 } else {
|
|
|
578 rev->handler(rev);
|
|
0
|
579 }
|
|
|
580 }
|
|
|
581
|
|
|
582 wev = c->write;
|
|
|
583
|
|
|
584 if (wev->active
|
|
|
585 && !wev->closed
|
|
58
|
586 && wev->handler
|
|
0
|
587 && (overflow_list[i].revents
|
|
|
588 & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
589 {
|
|
|
590 tested++;
|
|
|
591
|
|
112
|
592 if (flags & NGX_POST_THREAD_EVENTS) {
|
|
0
|
593 wev->posted_ready = 1;
|
|
|
594
|
|
|
595 } else {
|
|
|
596 wev->ready = 1;
|
|
112
|
597 }
|
|
|
598
|
|
|
599 if (flags & NGX_POST_EVENTS) {
|
|
|
600 ngx_locked_post_event(wev, &ngx_posted_events);
|
|
|
601
|
|
|
602 } else {
|
|
|
603 wev->handler(wev);
|
|
0
|
604 }
|
|
|
605 }
|
|
|
606 }
|
|
|
607
|
|
|
608 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
609
|
|
|
610 if (tested >= rtscf->overflow_test) {
|
|
|
611
|
|
|
612 if (ngx_linux_rtsig_max) {
|
|
|
613
|
|
|
614 /*
|
|
|
615 * Check the current rt queue length to prevent
|
|
|
616 * the new overflow.
|
|
|
617 *
|
|
112
|
618 * learn the "/proc/sys/kernel/rtsig-max" value because
|
|
|
619 * it can be changed since the last checking
|
|
0
|
620 */
|
|
|
621
|
|
|
622 name[0] = CTL_KERN;
|
|
|
623 name[1] = KERN_RTSIGMAX;
|
|
|
624 len = sizeof(rtsig_max);
|
|
42
|
625
|
|
|
626 if (sysctl(name, 2, &rtsig_max, &len, NULL, 0) == -1) {
|
|
0
|
627 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
628 "sysctl(KERN_RTSIGMAX) failed");
|
|
|
629 return NGX_ERROR;
|
|
|
630 }
|
|
|
631
|
|
42
|
632 /* name[0] = CTL_KERN; */
|
|
0
|
633 name[1] = KERN_RTSIGNR;
|
|
|
634 len = sizeof(rtsig_nr);
|
|
42
|
635
|
|
|
636 if (sysctl(name, 2, &rtsig_nr, &len, NULL, 0) == -1) {
|
|
0
|
637 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
638 "sysctl(KERN_RTSIGNR) failed");
|
|
|
639 return NGX_ERROR;
|
|
|
640 }
|
|
|
641
|
|
|
642 /*
|
|
112
|
643 * drain the rt signal queue if the /"proc/sys/kernel/rtsig-nr"
|
|
0
|
644 * is bigger than
|
|
112
|
645 * "/proc/sys/kernel/rtsig-max" / "rtsig_overflow_threshold"
|
|
0
|
646 */
|
|
|
647
|
|
324
|
648 if (rtsig_max / (int) rtscf->overflow_threshold < rtsig_nr) {
|
|
0
|
649 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
650 "rtsig queue state: %d/%d",
|
|
|
651 rtsig_nr, rtsig_max);
|
|
112
|
652 while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK)
|
|
|
653 {
|
|
0
|
654 /* void */
|
|
|
655 }
|
|
|
656 }
|
|
|
657
|
|
|
658 } else {
|
|
|
659
|
|
|
660 /*
|
|
|
661 * Linux has not KERN_RTSIGMAX since 2.6.6-mm2
|
|
|
662 * so drain the rt signal queue unconditionally
|
|
|
663 */
|
|
|
664
|
|
112
|
665 while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK) {
|
|
|
666 /* void */
|
|
|
667 }
|
|
0
|
668 }
|
|
|
669
|
|
|
670 tested = 0;
|
|
|
671 }
|
|
|
672 }
|
|
|
673
|
|
112
|
674 if (flags & NGX_UPDATE_TIME) {
|
|
566
|
675 ngx_time_update();
|
|
0
|
676 }
|
|
|
677
|
|
76
|
678 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
0
|
679 "rt signal queue overflow recovered");
|
|
|
680
|
|
|
681 overflow = 0;
|
|
|
682 ngx_event_actions.process_events = ngx_rtsig_process_events;
|
|
|
683
|
|
|
684 return NGX_OK;
|
|
|
685 }
|
|
|
686
|
|
|
687
|
|
48
|
688 static void *
|
|
|
689 ngx_rtsig_create_conf(ngx_cycle_t *cycle)
|
|
0
|
690 {
|
|
|
691 ngx_rtsig_conf_t *rtscf;
|
|
|
692
|
|
50
|
693 rtscf = ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t));
|
|
|
694 if (rtscf == NULL) {
|
|
496
|
695 return NULL;
|
|
50
|
696 }
|
|
0
|
697
|
|
|
698 rtscf->signo = NGX_CONF_UNSET;
|
|
|
699 rtscf->overflow_events = NGX_CONF_UNSET;
|
|
|
700 rtscf->overflow_test = NGX_CONF_UNSET;
|
|
|
701 rtscf->overflow_threshold = NGX_CONF_UNSET;
|
|
|
702
|
|
|
703 return rtscf;
|
|
|
704 }
|
|
|
705
|
|
|
706
|
|
48
|
707 static char *
|
|
|
708 ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
709 {
|
|
|
710 ngx_rtsig_conf_t *rtscf = conf;
|
|
|
711
|
|
|
712 /* LinuxThreads use the first 3 RT signals */
|
|
324
|
713 ngx_conf_init_uint_value(rtscf->signo, SIGRTMIN + 10);
|
|
0
|
714
|
|
324
|
715 ngx_conf_init_uint_value(rtscf->overflow_events, 16);
|
|
|
716 ngx_conf_init_uint_value(rtscf->overflow_test, 32);
|
|
|
717 ngx_conf_init_uint_value(rtscf->overflow_threshold, 10);
|
|
0
|
718
|
|
|
719 return NGX_CONF_OK;
|
|
|
720 }
|
|
|
721
|
|
|
722
|
|
48
|
723 static char *
|
|
324
|
724 ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf, void *post, void *data)
|
|
0
|
725 {
|
|
|
726 if (ngx_linux_rtsig_max) {
|
|
|
727 return ngx_conf_check_num_bounds(cf, post, data);
|
|
|
728 }
|
|
|
729
|
|
|
730 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
|
|
731 "\"rtsig_overflow_threshold\" is not supported "
|
|
|
732 "since Linux 2.6.6-mm2, ignored");
|
|
|
733
|
|
|
734 return NGX_CONF_OK;
|
|
|
735 }
|
