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