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