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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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682
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15 #if (NGX_DARWIN)
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16
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17 #define SIGRTMIN 33
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18 #define si_fd __pad[0]
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19
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20 #else
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21
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370
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22 #ifdef SIGRTMIN
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23 #define si_fd _reason.__spare__.__spare2__[0]
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24 #else
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25 #define SIGRTMIN 33
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26 #define si_fd __spare__[0]
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27 #endif
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28
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682
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29 #endif
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30
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0
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31 #define F_SETSIG 10
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32 #define KERN_RTSIGNR 30
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33 #define KERN_RTSIGMAX 31
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34
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35 int sigtimedwait(const sigset_t *set, siginfo_t *info,
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682
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36 const struct timespec *timeout);
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37
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38 int sigtimedwait(const sigset_t *set, siginfo_t *info,
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0
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39 const struct timespec *timeout)
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40 {
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41 return -1;
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42 }
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43
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44 int ngx_linux_rtsig_max;
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45
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46 #endif
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47
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48
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49 typedef struct {
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324
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50 ngx_uint_t signo;
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51 ngx_uint_t overflow_events;
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52 ngx_uint_t overflow_test;
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53 ngx_uint_t overflow_threshold;
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0
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54 } ngx_rtsig_conf_t;
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55
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56
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57 extern ngx_event_module_t ngx_poll_module_ctx;
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58
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112
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59 static ngx_int_t ngx_rtsig_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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0
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60 static void ngx_rtsig_done(ngx_cycle_t *cycle);
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61 static ngx_int_t ngx_rtsig_add_connection(ngx_connection_t *c);
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324
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62 static ngx_int_t ngx_rtsig_del_connection(ngx_connection_t *c,
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63 ngx_uint_t flags);
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112
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64 static ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle,
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65 ngx_msec_t timer, ngx_uint_t flags);
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66 static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle,
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67 ngx_msec_t timer, ngx_uint_t flags);
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0
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68
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69 static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle);
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70 static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf);
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71 static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
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48
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72 void *post, void *data);
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0
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73
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74
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75 static sigset_t set;
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76 static ngx_uint_t overflow, overflow_current;
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77 static struct pollfd *overflow_list;
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78
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79
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80 static ngx_str_t rtsig_name = ngx_string("rtsig");
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81
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82 static ngx_conf_num_bounds_t ngx_overflow_threshold_bounds = {
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83 ngx_check_ngx_overflow_threshold_bounds, 2, 10
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84 };
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85
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86
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87 static ngx_command_t ngx_rtsig_commands[] = {
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88
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48
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89 { ngx_string("rtsig_signo"),
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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, signo),
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94 NULL },
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0
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95
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48
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96 { ngx_string("rtsig_overflow_events"),
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97 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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98 ngx_conf_set_num_slot,
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99 0,
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100 offsetof(ngx_rtsig_conf_t, overflow_events),
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101 NULL },
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0
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102
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48
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103 { ngx_string("rtsig_overflow_test"),
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104 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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105 ngx_conf_set_num_slot,
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106 0,
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107 offsetof(ngx_rtsig_conf_t, overflow_test),
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108 NULL },
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0
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109
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48
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110 { ngx_string("rtsig_overflow_threshold"),
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111 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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112 ngx_conf_set_num_slot,
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113 0,
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114 offsetof(ngx_rtsig_conf_t, overflow_threshold),
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115 &ngx_overflow_threshold_bounds },
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0
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116
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48
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117 ngx_null_command
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0
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118 };
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119
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120
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121 ngx_event_module_t ngx_rtsig_module_ctx = {
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122 &rtsig_name,
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123 ngx_rtsig_create_conf, /* create configuration */
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124 ngx_rtsig_init_conf, /* init configuration */
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125
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126 {
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127 NULL, /* add an event */
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128 NULL, /* delete an event */
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129 NULL, /* enable an event */
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130 NULL, /* disable an event */
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131 ngx_rtsig_add_connection, /* add an connection */
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132 ngx_rtsig_del_connection, /* delete an connection */
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133 NULL, /* process the changes */
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134 ngx_rtsig_process_events, /* process the events */
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135 ngx_rtsig_init, /* init the events */
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136 ngx_rtsig_done, /* done the events */
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137 }
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138
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139 };
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140
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141 ngx_module_t ngx_rtsig_module = {
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58
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142 NGX_MODULE_V1,
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0
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143 &ngx_rtsig_module_ctx, /* module context */
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144 ngx_rtsig_commands, /* module directives */
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48
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145 NGX_EVENT_MODULE, /* module type */
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90
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146 NULL, /* init master */
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48
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147 NULL, /* init module */
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90
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148 NULL, /* init process */
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149 NULL, /* init thread */
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150 NULL, /* exit thread */
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151 NULL, /* exit process */
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152 NULL, /* exit master */
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153 NGX_MODULE_V1_PADDING
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0
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154 };
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155
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156
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48
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157 static ngx_int_t
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112
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158 ngx_rtsig_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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0
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159 {
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160 ngx_rtsig_conf_t *rtscf;
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161
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162 rtscf = ngx_event_get_conf(cycle->conf_ctx, ngx_rtsig_module);
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163
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164 sigemptyset(&set);
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324
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165 sigaddset(&set, (int) rtscf->signo);
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166 sigaddset(&set, (int) rtscf->signo + 1);
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0
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167 sigaddset(&set, SIGIO);
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112
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168 sigaddset(&set, SIGALRM);
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0
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169
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170 if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
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171 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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172 "sigprocmask() failed");
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173 return NGX_ERROR;
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174 }
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175
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176 if (overflow_list) {
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177 ngx_free(overflow_list);
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178 }
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179
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180 overflow_list = ngx_alloc(sizeof(struct pollfd) * rtscf->overflow_events,
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181 cycle->log);
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182 if (overflow_list == NULL) {
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183 return NGX_ERROR;
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184 }
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185
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186 ngx_io = ngx_os_io;
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187
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188 ngx_event_actions = ngx_rtsig_module_ctx.actions;
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189
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92
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190 ngx_event_flags = NGX_USE_RTSIG_EVENT
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191 |NGX_USE_GREEDY_EVENT
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192 |NGX_USE_FD_EVENT;
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0
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193
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194 return NGX_OK;
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195 }
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196
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197
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48
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198 static void
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199 ngx_rtsig_done(ngx_cycle_t *cycle)
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0
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200 {
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2
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201 ngx_free(overflow_list);
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202
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203 overflow_list = NULL;
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0
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204 }
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205
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206
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48
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207 static ngx_int_t
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208 ngx_rtsig_add_connection(ngx_connection_t *c)
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0
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209 {
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324
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210 ngx_uint_t signo;
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0
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211 ngx_rtsig_conf_t *rtscf;
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212
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213 if (c->read->accept && c->read->disabled) {
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214
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215 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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216 "rtsig enable connection: fd:%d", c->fd);
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217
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218 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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219 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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220 "fcntl(F_SETOWN) failed");
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221 return NGX_ERROR;
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222 }
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223
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224 c->read->active = 1;
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225 c->read->disabled = 0;
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226 }
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227
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228 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
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229
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230 signo = rtscf->signo + c->read->instance;
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231
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232 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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324
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233 "rtsig add connection: fd:%d signo:%ui", c->fd, signo);
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0
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234
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235 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) == -1) {
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236 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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237 "fcntl(O_RDWR|O_NONBLOCK|O_ASYNC) failed");
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238 return NGX_ERROR;
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239 }
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240
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324
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241 if (fcntl(c->fd, F_SETSIG, (int) signo) == -1) {
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0
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242 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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243 "fcntl(F_SETSIG) failed");
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244 return NGX_ERROR;
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245 }
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246
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247 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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248 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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249 "fcntl(F_SETOWN) failed");
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250 return NGX_ERROR;
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251 }
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252
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18
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253 #if (NGX_HAVE_ONESIGFD)
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0
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254 if (fcntl(c->fd, F_SETAUXFL, O_ONESIGFD) == -1) {
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255 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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256 "fcntl(F_SETAUXFL) failed");
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257 return NGX_ERROR;
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258 }
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259 #endif
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260
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261 c->read->active = 1;
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262 c->write->active = 1;
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263
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264 return NGX_OK;
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265 }
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266
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267
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48
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268 static ngx_int_t
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324
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269 ngx_rtsig_del_connection(ngx_connection_t *c, ngx_uint_t flags)
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0
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270 {
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271 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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272 "rtsig del connection: fd:%d", c->fd);
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273
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274 if ((flags & NGX_DISABLE_EVENT) && c->read->accept) {
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275
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276 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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277 "rtsig disable connection: fd:%d", c->fd);
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278
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279 c->read->active = 0;
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280 c->read->disabled = 1;
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281 return NGX_OK;
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282 }
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283
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284 if (flags & NGX_CLOSE_EVENT) {
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285 c->read->active = 0;
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286 c->write->active = 0;
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287 return NGX_OK;
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288 }
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289
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290 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK) == -1) {
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291 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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292 "fcntl(O_RDWR|O_NONBLOCK) failed");
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293 return NGX_ERROR;
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294 }
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295
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296 c->read->active = 0;
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297 c->write->active = 0;
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298
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299 return NGX_OK;
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300 }
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301
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302
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48
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303 static ngx_int_t
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112
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304 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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305 {
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306 int signo;
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50
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307 ngx_int_t instance;
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0
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308 ngx_err_t err;
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309 siginfo_t si;
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122
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310 ngx_event_t *rev, *wev, **queue;
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0
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311 struct timespec ts, *tp;
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312 struct sigaction sa;
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313 ngx_connection_t *c;
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314 ngx_rtsig_conf_t *rtscf;
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315
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316 if (timer == NGX_TIMER_INFINITE) {
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317 tp = NULL;
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318
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319 } else {
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320 ts.tv_sec = timer / 1000;
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321 ts.tv_nsec = (timer % 1000) * 1000000;
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322 tp = &ts;
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323 }
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324
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325 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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106
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326 "rtsig timer: %M", timer);
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0
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327
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328 /* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
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329
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330 signo = sigtimedwait(&set, &si, tp);
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331
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332 if (signo == -1) {
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333 err = ngx_errno;
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334
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335 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
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336 "rtsig signo:%d", signo);
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337
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116
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338 if (flags & NGX_UPDATE_TIME) {
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566
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339 ngx_time_update();
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0
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340 }
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341
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116
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342 if (err == NGX_EAGAIN) {
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343
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344 /* timeout */
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0
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345
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116
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346 if (timer != NGX_TIMER_INFINITE) {
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347 return NGX_AGAIN;
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348 }
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126
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349
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116
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350 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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351 "sigtimedwait() returned EAGAIN without timeout");
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352 return NGX_ERROR;
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353 }
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0
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354
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355 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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356 cycle->log, err, "sigtimedwait() failed");
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357 return NGX_ERROR;
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358 }
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359
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116
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360 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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361 "rtsig signo:%d fd:%d band:%04Xd",
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362 signo, si.si_fd, si.si_band);
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0
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363
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116
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364 if (flags & NGX_UPDATE_TIME) {
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566
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365 ngx_time_update();
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0
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366 }
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367
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368 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
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369
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324
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370 if (signo == (int) rtscf->signo || signo == (int) rtscf->signo + 1) {
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0
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371
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372 if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
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373 return NGX_OK;
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374 }
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375
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100
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376 c = ngx_cycle->files[si.si_fd];
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377
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378 if (c == NULL) {
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112
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379
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100
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380 /* the stale event */
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0
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381
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100
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382 return NGX_OK;
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383 }
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0
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384
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324
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385 instance = signo - (int) rtscf->signo;
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0
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386
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387 rev = c->read;
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388
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112
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389 if (rev->instance != instance) {
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0
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390
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391 /*
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392 * the stale event from a file descriptor
|
|
|
393 * that was just closed in this iteration
|
|
|
394 */
|
|
|
395
|
|
|
396 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
397 "rtsig: stale event %p", c);
|
|
0
|
398
|
|
|
399 return NGX_OK;
|
|
|
400 }
|
|
|
401
|
|
112
|
402 if ((si.si_band & (POLLIN|POLLHUP|POLLERR)) && rev->active) {
|
|
122
|
403
|
|
112
|
404 rev->ready = 1;
|
|
122
|
405
|
|
|
406 if (flags & NGX_POST_EVENTS) {
|
|
|
407 queue = (ngx_event_t **) (rev->accept ?
|
|
|
408 &ngx_posted_accept_events : &ngx_posted_events);
|
|
|
409
|
|
|
410 ngx_locked_post_event(rev, queue);
|
|
|
411
|
|
126
|
412 } else {
|
|
122
|
413 rev->handler(rev);
|
|
|
414 }
|
|
0
|
415 }
|
|
|
416
|
|
|
417 wev = c->write;
|
|
|
418
|
|
112
|
419 if ((si.si_band & (POLLOUT|POLLHUP|POLLERR)) && wev->active) {
|
|
122
|
420
|
|
112
|
421 wev->ready = 1;
|
|
122
|
422
|
|
|
423 if (flags & NGX_POST_EVENTS) {
|
|
|
424 ngx_locked_post_event(wev, &ngx_posted_events);
|
|
|
425
|
|
|
426 } else {
|
|
|
427 wev->handler(wev);
|
|
|
428 }
|
|
0
|
429 }
|
|
|
430
|
|
116
|
431 return NGX_OK;
|
|
|
432
|
|
112
|
433 } else if (signo == SIGALRM) {
|
|
|
434
|
|
566
|
435 ngx_time_update();
|
|
116
|
436
|
|
112
|
437 return NGX_OK;
|
|
|
438
|
|
0
|
439 } else if (signo == SIGIO) {
|
|
|
440
|
|
|
441 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
442 "rt signal queue overflowed");
|
|
|
443
|
|
|
444 /* flush the RT signal queue */
|
|
|
445
|
|
|
446 ngx_memzero(&sa, sizeof(struct sigaction));
|
|
|
447 sa.sa_handler = SIG_DFL;
|
|
|
448 sigemptyset(&sa.sa_mask);
|
|
|
449
|
|
|
450 if (sigaction(rtscf->signo, &sa, NULL) == -1) {
|
|
|
451 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
452 "sigaction(%d, SIG_DFL) failed", rtscf->signo);
|
|
|
453 }
|
|
|
454
|
|
|
455 if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
|
|
|
456 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
457 "sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
|
|
|
458 }
|
|
|
459
|
|
|
460 overflow = 1;
|
|
|
461 overflow_current = 0;
|
|
|
462 ngx_event_actions.process_events = ngx_rtsig_process_overflow;
|
|
|
463
|
|
|
464 return NGX_ERROR;
|
|
|
465
|
|
|
466 }
|
|
|
467
|
|
116
|
468 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
469 "sigtimedwait() returned unexpected signal: %d", signo);
|
|
0
|
470
|
|
116
|
471 return NGX_ERROR;
|
|
0
|
472 }
|
|
|
473
|
|
|
474
|
|
48
|
475 static ngx_int_t
|
|
112
|
476 ngx_rtsig_process_overflow(ngx_cycle_t *cycle, ngx_msec_t timer,
|
|
|
477 ngx_uint_t flags)
|
|
0
|
478 {
|
|
|
479 int name[2], rtsig_max, rtsig_nr, events, ready;
|
|
|
480 size_t len;
|
|
|
481 ngx_err_t err;
|
|
324
|
482 ngx_uint_t tested, n, i;
|
|
112
|
483 ngx_event_t *rev, *wev, **queue;
|
|
0
|
484 ngx_connection_t *c;
|
|
|
485 ngx_rtsig_conf_t *rtscf;
|
|
|
486
|
|
112
|
487 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
488 "rtsig process overflow");
|
|
|
489
|
|
0
|
490 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
|
491
|
|
|
492 tested = 0;
|
|
|
493
|
|
|
494 for ( ;; ) {
|
|
|
495
|
|
|
496 n = 0;
|
|
|
497 while (n < rtscf->overflow_events) {
|
|
|
498
|
|
|
499 if (overflow_current == cycle->connection_n) {
|
|
|
500 break;
|
|
|
501 }
|
|
|
502
|
|
92
|
503 c = cycle->files[overflow_current++];
|
|
0
|
504
|
|
108
|
505 if (c == NULL || c->fd == -1) {
|
|
0
|
506 continue;
|
|
|
507 }
|
|
|
508
|
|
|
509 events = 0;
|
|
|
510
|
|
58
|
511 if (c->read->active && c->read->handler) {
|
|
0
|
512 events |= POLLIN;
|
|
|
513 }
|
|
|
514
|
|
58
|
515 if (c->write->active && c->write->handler) {
|
|
0
|
516 events |= POLLOUT;
|
|
|
517 }
|
|
|
518
|
|
|
519 if (events == 0) {
|
|
|
520 continue;
|
|
|
521 }
|
|
|
522
|
|
|
523 overflow_list[n].fd = c->fd;
|
|
|
524 overflow_list[n].events = events;
|
|
|
525 overflow_list[n].revents = 0;
|
|
|
526 n++;
|
|
|
527 }
|
|
|
528
|
|
|
529 if (n == 0) {
|
|
|
530 break;
|
|
|
531 }
|
|
|
532
|
|
|
533 for ( ;; ) {
|
|
|
534 ready = poll(overflow_list, n, 0);
|
|
|
535
|
|
112
|
536 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
537 "rtsig overflow poll:%d", ready);
|
|
|
538
|
|
0
|
539 if (ready == -1) {
|
|
|
540 err = ngx_errno;
|
|
|
541 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
542 cycle->log, 0,
|
|
|
543 "poll() failed while the overflow recover");
|
|
|
544
|
|
|
545 if (err == NGX_EINTR) {
|
|
|
546 continue;
|
|
|
547 }
|
|
|
548 }
|
|
|
549
|
|
|
550 break;
|
|
|
551 }
|
|
|
552
|
|
|
553 if (ready <= 0) {
|
|
|
554 continue;
|
|
|
555 }
|
|
|
556
|
|
112
|
557 ngx_mutex_lock(ngx_posted_events_mutex);
|
|
0
|
558
|
|
|
559 for (i = 0; i < n; i++) {
|
|
92
|
560 c = cycle->files[overflow_list[i].fd];
|
|
0
|
561
|
|
108
|
562 if (c == NULL) {
|
|
|
563 continue;
|
|
|
564 }
|
|
|
565
|
|
0
|
566 rev = c->read;
|
|
|
567
|
|
|
568 if (rev->active
|
|
|
569 && !rev->closed
|
|
58
|
570 && rev->handler
|
|
0
|
571 && (overflow_list[i].revents
|
|
|
572 & (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
573 {
|
|
|
574 tested++;
|
|
|
575
|
|
112
|
576 if ((flags & NGX_POST_THREAD_EVENTS) && !rev->accept) {
|
|
0
|
577 rev->posted_ready = 1;
|
|
|
578
|
|
|
579 } else {
|
|
|
580 rev->ready = 1;
|
|
112
|
581 }
|
|
|
582
|
|
|
583 if (flags & NGX_POST_EVENTS) {
|
|
|
584 queue = (ngx_event_t **) (rev->accept ?
|
|
|
585 &ngx_posted_accept_events : &ngx_posted_events);
|
|
|
586
|
|
|
587 ngx_locked_post_event(rev, queue);
|
|
|
588
|
|
|
589 } else {
|
|
|
590 rev->handler(rev);
|
|
0
|
591 }
|
|
|
592 }
|
|
|
593
|
|
|
594 wev = c->write;
|
|
|
595
|
|
|
596 if (wev->active
|
|
|
597 && !wev->closed
|
|
58
|
598 && wev->handler
|
|
0
|
599 && (overflow_list[i].revents
|
|
|
600 & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
601 {
|
|
|
602 tested++;
|
|
|
603
|
|
112
|
604 if (flags & NGX_POST_THREAD_EVENTS) {
|
|
0
|
605 wev->posted_ready = 1;
|
|
|
606
|
|
|
607 } else {
|
|
|
608 wev->ready = 1;
|
|
112
|
609 }
|
|
|
610
|
|
|
611 if (flags & NGX_POST_EVENTS) {
|
|
|
612 ngx_locked_post_event(wev, &ngx_posted_events);
|
|
|
613
|
|
|
614 } else {
|
|
|
615 wev->handler(wev);
|
|
0
|
616 }
|
|
|
617 }
|
|
|
618 }
|
|
|
619
|
|
|
620 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
621
|
|
|
622 if (tested >= rtscf->overflow_test) {
|
|
|
623
|
|
|
624 if (ngx_linux_rtsig_max) {
|
|
|
625
|
|
|
626 /*
|
|
|
627 * Check the current rt queue length to prevent
|
|
|
628 * the new overflow.
|
|
|
629 *
|
|
112
|
630 * learn the "/proc/sys/kernel/rtsig-max" value because
|
|
|
631 * it can be changed since the last checking
|
|
0
|
632 */
|
|
|
633
|
|
|
634 name[0] = CTL_KERN;
|
|
|
635 name[1] = KERN_RTSIGMAX;
|
|
|
636 len = sizeof(rtsig_max);
|
|
42
|
637
|
|
|
638 if (sysctl(name, 2, &rtsig_max, &len, NULL, 0) == -1) {
|
|
0
|
639 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
640 "sysctl(KERN_RTSIGMAX) failed");
|
|
|
641 return NGX_ERROR;
|
|
|
642 }
|
|
|
643
|
|
42
|
644 /* name[0] = CTL_KERN; */
|
|
0
|
645 name[1] = KERN_RTSIGNR;
|
|
|
646 len = sizeof(rtsig_nr);
|
|
42
|
647
|
|
|
648 if (sysctl(name, 2, &rtsig_nr, &len, NULL, 0) == -1) {
|
|
0
|
649 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
650 "sysctl(KERN_RTSIGNR) failed");
|
|
|
651 return NGX_ERROR;
|
|
|
652 }
|
|
|
653
|
|
|
654 /*
|
|
112
|
655 * drain the rt signal queue if the /"proc/sys/kernel/rtsig-nr"
|
|
0
|
656 * is bigger than
|
|
112
|
657 * "/proc/sys/kernel/rtsig-max" / "rtsig_overflow_threshold"
|
|
0
|
658 */
|
|
|
659
|
|
324
|
660 if (rtsig_max / (int) rtscf->overflow_threshold < rtsig_nr) {
|
|
0
|
661 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
662 "rtsig queue state: %d/%d",
|
|
|
663 rtsig_nr, rtsig_max);
|
|
112
|
664 while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK)
|
|
|
665 {
|
|
0
|
666 /* void */
|
|
|
667 }
|
|
|
668 }
|
|
|
669
|
|
|
670 } else {
|
|
|
671
|
|
|
672 /*
|
|
|
673 * Linux has not KERN_RTSIGMAX since 2.6.6-mm2
|
|
|
674 * so drain the rt signal queue unconditionally
|
|
|
675 */
|
|
|
676
|
|
112
|
677 while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK) {
|
|
|
678 /* void */
|
|
|
679 }
|
|
0
|
680 }
|
|
|
681
|
|
|
682 tested = 0;
|
|
|
683 }
|
|
|
684 }
|
|
|
685
|
|
112
|
686 if (flags & NGX_UPDATE_TIME) {
|
|
566
|
687 ngx_time_update();
|
|
0
|
688 }
|
|
|
689
|
|
76
|
690 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
0
|
691 "rt signal queue overflow recovered");
|
|
|
692
|
|
|
693 overflow = 0;
|
|
|
694 ngx_event_actions.process_events = ngx_rtsig_process_events;
|
|
|
695
|
|
|
696 return NGX_OK;
|
|
|
697 }
|
|
|
698
|
|
|
699
|
|
48
|
700 static void *
|
|
|
701 ngx_rtsig_create_conf(ngx_cycle_t *cycle)
|
|
0
|
702 {
|
|
|
703 ngx_rtsig_conf_t *rtscf;
|
|
|
704
|
|
50
|
705 rtscf = ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t));
|
|
|
706 if (rtscf == NULL) {
|
|
496
|
707 return NULL;
|
|
50
|
708 }
|
|
0
|
709
|
|
|
710 rtscf->signo = NGX_CONF_UNSET;
|
|
|
711 rtscf->overflow_events = NGX_CONF_UNSET;
|
|
|
712 rtscf->overflow_test = NGX_CONF_UNSET;
|
|
|
713 rtscf->overflow_threshold = NGX_CONF_UNSET;
|
|
|
714
|
|
|
715 return rtscf;
|
|
|
716 }
|
|
|
717
|
|
|
718
|
|
48
|
719 static char *
|
|
|
720 ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
721 {
|
|
|
722 ngx_rtsig_conf_t *rtscf = conf;
|
|
|
723
|
|
|
724 /* LinuxThreads use the first 3 RT signals */
|
|
324
|
725 ngx_conf_init_uint_value(rtscf->signo, SIGRTMIN + 10);
|
|
0
|
726
|
|
324
|
727 ngx_conf_init_uint_value(rtscf->overflow_events, 16);
|
|
|
728 ngx_conf_init_uint_value(rtscf->overflow_test, 32);
|
|
|
729 ngx_conf_init_uint_value(rtscf->overflow_threshold, 10);
|
|
0
|
730
|
|
|
731 return NGX_CONF_OK;
|
|
|
732 }
|
|
|
733
|
|
|
734
|
|
48
|
735 static char *
|
|
324
|
736 ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf, void *post, void *data)
|
|
0
|
737 {
|
|
|
738 if (ngx_linux_rtsig_max) {
|
|
|
739 return ngx_conf_check_num_bounds(cf, post, data);
|
|
|
740 }
|
|
|
741
|
|
|
742 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
|
|
743 "\"rtsig_overflow_threshold\" is not supported "
|
|
|
744 "since Linux 2.6.6-mm2, ignored");
|
|
|
745
|
|
|
746 return NGX_CONF_OK;
|
|
|
747 }
|
