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