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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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41 static ngx_int_t ngx_rtsig_init(ngx_cycle_t *cycle);
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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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45 static ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle);
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46 static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle);
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47
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48 static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle);
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49 static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf);
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50 static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
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48
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51 void *post, void *data);
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0
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52
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53
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54 static sigset_t set;
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55 static ngx_uint_t overflow, overflow_current;
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56 static struct pollfd *overflow_list;
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57
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58
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59 static ngx_str_t rtsig_name = ngx_string("rtsig");
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60
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61 static ngx_conf_num_bounds_t ngx_overflow_threshold_bounds = {
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62 ngx_check_ngx_overflow_threshold_bounds, 2, 10
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63 };
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64
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65
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66 static ngx_command_t ngx_rtsig_commands[] = {
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67
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48
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68 { ngx_string("rtsig_signo"),
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69 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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70 ngx_conf_set_num_slot,
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71 0,
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72 offsetof(ngx_rtsig_conf_t, signo),
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73 NULL },
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0
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74
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48
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75 { ngx_string("rtsig_overflow_events"),
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76 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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77 ngx_conf_set_num_slot,
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78 0,
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79 offsetof(ngx_rtsig_conf_t, overflow_events),
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80 NULL },
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0
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81
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48
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82 { ngx_string("rtsig_overflow_test"),
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83 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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84 ngx_conf_set_num_slot,
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85 0,
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86 offsetof(ngx_rtsig_conf_t, overflow_test),
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87 NULL },
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0
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88
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48
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89 { ngx_string("rtsig_overflow_threshold"),
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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, overflow_threshold),
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94 &ngx_overflow_threshold_bounds },
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0
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95
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48
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96 ngx_null_command
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0
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97 };
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98
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99
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100 ngx_event_module_t ngx_rtsig_module_ctx = {
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101 &rtsig_name,
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102 ngx_rtsig_create_conf, /* create configuration */
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103 ngx_rtsig_init_conf, /* init configuration */
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104
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105 {
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106 NULL, /* add an event */
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107 NULL, /* delete an event */
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108 NULL, /* enable an event */
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109 NULL, /* disable an event */
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110 ngx_rtsig_add_connection, /* add an connection */
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111 ngx_rtsig_del_connection, /* delete an connection */
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112 NULL, /* process the changes */
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113 ngx_rtsig_process_events, /* process the events */
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114 ngx_rtsig_init, /* init the events */
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115 ngx_rtsig_done, /* done the events */
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116 }
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117
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118 };
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119
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120 ngx_module_t ngx_rtsig_module = {
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58
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121 NGX_MODULE_V1,
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0
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122 &ngx_rtsig_module_ctx, /* module context */
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123 ngx_rtsig_commands, /* module directives */
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48
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124 NGX_EVENT_MODULE, /* module type */
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90
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125 NULL, /* init master */
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48
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126 NULL, /* init module */
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90
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127 NULL, /* init process */
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128 NULL, /* init thread */
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129 NULL, /* exit thread */
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130 NULL, /* exit process */
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131 NULL, /* exit master */
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132 NGX_MODULE_V1_PADDING
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0
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133 };
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134
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135
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48
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136 static ngx_int_t
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137 ngx_rtsig_init(ngx_cycle_t *cycle)
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0
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138 {
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139 ngx_rtsig_conf_t *rtscf;
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140
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141 rtscf = ngx_event_get_conf(cycle->conf_ctx, ngx_rtsig_module);
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142
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143 sigemptyset(&set);
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144 sigaddset(&set, rtscf->signo);
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145 sigaddset(&set, rtscf->signo + 1);
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146 sigaddset(&set, SIGIO);
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147
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148 if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
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149 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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150 "sigprocmask() failed");
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151 return NGX_ERROR;
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152 }
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153
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154 if (overflow_list) {
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155 ngx_free(overflow_list);
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156 }
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157
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158 overflow_list = ngx_alloc(sizeof(struct pollfd) * rtscf->overflow_events,
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159 cycle->log);
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160 if (overflow_list == NULL) {
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161 return NGX_ERROR;
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162 }
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163
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164 ngx_io = ngx_os_io;
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165
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166 ngx_event_actions = ngx_rtsig_module_ctx.actions;
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167
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92
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168 ngx_event_flags = NGX_USE_RTSIG_EVENT
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169 |NGX_USE_GREEDY_EVENT
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170 |NGX_USE_FD_EVENT;
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0
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171
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172 return NGX_OK;
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173 }
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174
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175
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48
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176 static void
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177 ngx_rtsig_done(ngx_cycle_t *cycle)
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0
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178 {
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2
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179 ngx_free(overflow_list);
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180
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181 overflow_list = NULL;
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0
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182 }
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183
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184
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48
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185 static ngx_int_t
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186 ngx_rtsig_add_connection(ngx_connection_t *c)
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0
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187 {
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188 int signo;
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189 ngx_rtsig_conf_t *rtscf;
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190
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191 if (c->read->accept && c->read->disabled) {
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192
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193 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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194 "rtsig enable connection: fd:%d", c->fd);
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195
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196 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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197 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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198 "fcntl(F_SETOWN) failed");
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199 return NGX_ERROR;
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200 }
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201
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202 c->read->active = 1;
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203 c->read->disabled = 0;
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204 }
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205
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206 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
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207
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208 signo = rtscf->signo + c->read->instance;
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209
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210 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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211 "rtsig add connection: fd:%d signo:%d", c->fd, signo);
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212
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213 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) == -1) {
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214 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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215 "fcntl(O_RDWR|O_NONBLOCK|O_ASYNC) failed");
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216 return NGX_ERROR;
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217 }
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218
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219 if (fcntl(c->fd, F_SETSIG, signo) == -1) {
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220 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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221 "fcntl(F_SETSIG) failed");
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222 return NGX_ERROR;
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223 }
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224
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225 if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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226 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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227 "fcntl(F_SETOWN) failed");
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228 return NGX_ERROR;
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229 }
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230
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18
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231 #if (NGX_HAVE_ONESIGFD)
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0
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232 if (fcntl(c->fd, F_SETAUXFL, O_ONESIGFD) == -1) {
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233 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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234 "fcntl(F_SETAUXFL) failed");
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235 return NGX_ERROR;
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236 }
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237 #endif
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238
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239 c->read->active = 1;
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240 c->write->active = 1;
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241
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242 return NGX_OK;
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243 }
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244
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245
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48
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246 static ngx_int_t
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247 ngx_rtsig_del_connection(ngx_connection_t *c, u_int flags)
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0
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248 {
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249 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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250 "rtsig del connection: fd:%d", c->fd);
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251
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252 if ((flags & NGX_DISABLE_EVENT) && c->read->accept) {
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253
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254 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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255 "rtsig disable connection: fd:%d", c->fd);
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256
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257 c->read->active = 0;
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258 c->read->disabled = 1;
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259 return NGX_OK;
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260 }
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261
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262 if (flags & NGX_CLOSE_EVENT) {
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263 c->read->active = 0;
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264 c->write->active = 0;
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265 return NGX_OK;
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266 }
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267
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268 if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK) == -1) {
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269 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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270 "fcntl(O_RDWR|O_NONBLOCK) failed");
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271 return NGX_ERROR;
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272 }
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273
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274 c->read->active = 0;
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275 c->write->active = 0;
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276
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277 return NGX_OK;
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278 }
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279
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280
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48
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281 static ngx_int_t
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282 ngx_rtsig_process_events(ngx_cycle_t *cycle)
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0
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283 {
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284 int signo;
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50
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285 ngx_int_t instance;
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0
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286 ngx_uint_t expire;
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287 ngx_msec_t timer;
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288 ngx_err_t err;
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289 siginfo_t si;
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290 ngx_event_t *rev, *wev;
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291 struct timeval tv;
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292 struct timespec ts, *tp;
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293 struct sigaction sa;
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294 ngx_epoch_msec_t delta;
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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 (overflow) {
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299 timer = 0;
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300 expire = 0;
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301
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302 } else {
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303 for ( ;; ) {
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304 timer = ngx_event_find_timer();
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305
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306 #if (NGX_THREADS)
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307
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308 if (timer == NGX_TIMER_ERROR) {
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309 return NGX_ERROR;
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310 }
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311
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312 if (timer == NGX_TIMER_INFINITE || timer > 500) {
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313 timer = 500;
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314 break;
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315 }
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316
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317 #endif
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318
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319 if (timer != 0) {
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320 break;
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321 }
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322
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323 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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324 "rtsig expired timer");
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325
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326 ngx_event_expire_timers((ngx_msec_t)
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327 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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328
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329 if (ngx_posted_events && ngx_threaded) {
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330 ngx_wakeup_worker_thread(cycle);
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331 }
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332 }
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333
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334 expire = 1;
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335
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336 if (ngx_accept_mutex) {
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337 if (ngx_accept_disabled > 0) {
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338 ngx_accept_disabled--;
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339
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340 } else {
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341 ngx_accept_mutex_held = 0;
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342
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343 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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344 return NGX_ERROR;
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345 }
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346
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347 if (ngx_accept_mutex_held == 0
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348 && (timer == NGX_TIMER_INFINITE
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349 || timer > ngx_accept_mutex_delay))
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350 {
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351 timer = ngx_accept_mutex_delay;
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352 expire = 0;
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353 }
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354 }
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355 }
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356 }
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357
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358 if (timer == NGX_TIMER_INFINITE) {
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359 tp = NULL;
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360 expire = 0;
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361
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362 } else {
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363 ts.tv_sec = timer / 1000;
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364 ts.tv_nsec = (timer % 1000) * 1000000;
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365 tp = &ts;
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366 }
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367
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368 ngx_old_elapsed_msec = ngx_elapsed_msec;
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369
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370 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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371 "rtsig timer: %d", timer);
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372
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373 /* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
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374
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375 signo = sigtimedwait(&set, &si, tp);
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376
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377 if (signo == -1) {
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378 err = ngx_errno;
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379
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380 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
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381 "rtsig signo:%d", signo);
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382
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383 if (err == NGX_EAGAIN) {
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384
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385 if (timer == NGX_TIMER_INFINITE) {
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386 ngx_accept_mutex_unlock();
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387 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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388 "sigtimedwait() returned EAGAIN without timeout");
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389 return NGX_ERROR;
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390 }
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391
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392 err = 0;
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393 }
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394
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395 } else {
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396 err = 0;
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397 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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398 "rtsig signo:%d fd:%d band:%04Xd",
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0
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399 signo, si.si_fd, si.si_band);
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400 }
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401
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402 ngx_gettimeofday(&tv);
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403 ngx_time_update(tv.tv_sec);
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404
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405 delta = ngx_elapsed_msec;
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406 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
|
|
|
407 + tv.tv_usec / 1000 - ngx_start_msec;
|
|
|
408
|
|
|
409 if (err) {
|
|
|
410 ngx_accept_mutex_unlock();
|
|
|
411 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
412 cycle->log, err, "sigtimedwait() failed");
|
|
|
413 return NGX_ERROR;
|
|
|
414 }
|
|
|
415
|
|
|
416 if (timer != NGX_TIMER_INFINITE) {
|
|
|
417 delta = ngx_elapsed_msec - delta;
|
|
|
418
|
|
|
419 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
420 "rtsig timer: %d, delta: %d", timer, (int) delta);
|
|
|
421 }
|
|
|
422
|
|
|
423 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
|
424
|
|
|
425 if (signo == rtscf->signo || signo == rtscf->signo + 1) {
|
|
|
426
|
|
|
427 if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
|
|
|
428 return NGX_OK;
|
|
|
429 }
|
|
|
430
|
|
100
|
431 c = ngx_cycle->files[si.si_fd];
|
|
|
432
|
|
|
433 if (c == NULL) {
|
|
|
434 /* the stale event */
|
|
0
|
435
|
|
100
|
436 ngx_accept_mutex_unlock();
|
|
|
437
|
|
|
438 return NGX_OK;
|
|
|
439 }
|
|
0
|
440
|
|
|
441 instance = signo - rtscf->signo;
|
|
|
442
|
|
|
443 rev = c->read;
|
|
|
444
|
|
|
445 if (c->read->instance != instance) {
|
|
|
446
|
|
|
447 /*
|
|
|
448 * the stale event from a file descriptor
|
|
|
449 * that was just closed in this iteration
|
|
|
450 */
|
|
|
451
|
|
|
452 ngx_accept_mutex_unlock();
|
|
|
453
|
|
|
454 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
455 "rtsig: stale event %p", c);
|
|
0
|
456
|
|
|
457 return NGX_OK;
|
|
|
458 }
|
|
|
459
|
|
|
460 if (si.si_band & (POLLIN|POLLHUP|POLLERR)) {
|
|
|
461 if (rev->active) {
|
|
|
462
|
|
|
463 if (ngx_threaded && !rev->accept) {
|
|
|
464 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
465 ngx_accept_mutex_unlock();
|
|
|
466 return NGX_ERROR;
|
|
|
467 }
|
|
|
468
|
|
|
469 rev->posted_ready = 1;
|
|
|
470 ngx_post_event(rev);
|
|
|
471
|
|
|
472 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
473
|
|
|
474 } else {
|
|
|
475 rev->ready = 1;
|
|
|
476
|
|
|
477 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
58
|
478 rev->handler(rev);
|
|
0
|
479
|
|
|
480 } else if (rev->accept) {
|
|
|
481 if (ngx_accept_disabled <= 0) {
|
|
58
|
482 rev->handler(rev);
|
|
0
|
483 }
|
|
|
484
|
|
|
485 } else {
|
|
|
486 ngx_post_event(rev);
|
|
|
487 }
|
|
|
488 }
|
|
|
489 }
|
|
|
490 }
|
|
|
491
|
|
|
492 wev = c->write;
|
|
|
493
|
|
|
494 if (si.si_band & (POLLOUT|POLLHUP|POLLERR)) {
|
|
|
495 if (wev->active) {
|
|
|
496
|
|
|
497 if (ngx_threaded) {
|
|
|
498 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
499 ngx_accept_mutex_unlock();
|
|
|
500 return NGX_ERROR;
|
|
|
501 }
|
|
|
502
|
|
|
503 wev->posted_ready = 1;
|
|
|
504 ngx_post_event(wev);
|
|
|
505
|
|
|
506 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
507
|
|
|
508 } else {
|
|
|
509 wev->ready = 1;
|
|
|
510
|
|
|
511 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
58
|
512 wev->handler(wev);
|
|
0
|
513
|
|
|
514 } else {
|
|
|
515 ngx_post_event(wev);
|
|
|
516 }
|
|
|
517 }
|
|
|
518 }
|
|
|
519 }
|
|
|
520
|
|
|
521 } else if (signo == SIGIO) {
|
|
|
522 ngx_accept_mutex_unlock();
|
|
|
523
|
|
|
524 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
525 "rt signal queue overflowed");
|
|
|
526
|
|
|
527 /* flush the RT signal queue */
|
|
|
528
|
|
|
529 ngx_memzero(&sa, sizeof(struct sigaction));
|
|
|
530 sa.sa_handler = SIG_DFL;
|
|
|
531 sigemptyset(&sa.sa_mask);
|
|
|
532
|
|
|
533 if (sigaction(rtscf->signo, &sa, NULL) == -1) {
|
|
|
534 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
535 "sigaction(%d, SIG_DFL) failed", rtscf->signo);
|
|
|
536 }
|
|
|
537
|
|
|
538 if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
|
|
|
539 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
540 "sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
|
|
|
541 }
|
|
|
542
|
|
|
543 overflow = 1;
|
|
|
544 overflow_current = 0;
|
|
|
545 ngx_event_actions.process_events = ngx_rtsig_process_overflow;
|
|
|
546
|
|
|
547 return NGX_ERROR;
|
|
|
548
|
|
|
549 } else if (signo != -1) {
|
|
|
550 ngx_accept_mutex_unlock();
|
|
|
551
|
|
|
552 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
553 "sigtimedwait() returned unexpected signal: %d", signo);
|
|
|
554
|
|
|
555 return NGX_ERROR;
|
|
|
556 }
|
|
|
557
|
|
|
558 ngx_accept_mutex_unlock();
|
|
|
559
|
|
|
560 if (expire && delta) {
|
|
|
561 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
|
562 }
|
|
|
563
|
|
|
564 if (ngx_posted_events) {
|
|
|
565 if (ngx_threaded) {
|
|
|
566 ngx_wakeup_worker_thread(cycle);
|
|
|
567
|
|
|
568 } else {
|
|
|
569 ngx_event_process_posted(cycle);
|
|
|
570 }
|
|
|
571 }
|
|
|
572
|
|
|
573 if (signo == -1) {
|
|
|
574 return NGX_AGAIN;
|
|
|
575 } else {
|
|
|
576 return NGX_OK;
|
|
|
577 }
|
|
|
578 }
|
|
|
579
|
|
|
580
|
|
|
581 /* TODO: old cylces */
|
|
|
582
|
|
48
|
583 static ngx_int_t
|
|
|
584 ngx_rtsig_process_overflow(ngx_cycle_t *cycle)
|
|
0
|
585 {
|
|
|
586 int name[2], rtsig_max, rtsig_nr, events, ready;
|
|
|
587 size_t len;
|
|
|
588 ngx_int_t tested, n, i;
|
|
|
589 ngx_err_t err;
|
|
|
590 ngx_event_t *rev, *wev;
|
|
|
591 ngx_connection_t *c;
|
|
|
592 ngx_rtsig_conf_t *rtscf;
|
|
|
593
|
|
|
594 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
|
595
|
|
|
596 tested = 0;
|
|
|
597
|
|
|
598 for ( ;; ) {
|
|
|
599
|
|
|
600 n = 0;
|
|
|
601 while (n < rtscf->overflow_events) {
|
|
|
602
|
|
|
603 if (overflow_current == cycle->connection_n) {
|
|
|
604 break;
|
|
|
605 }
|
|
|
606
|
|
92
|
607 c = cycle->files[overflow_current++];
|
|
0
|
608
|
|
|
609 if (c->fd == -1) {
|
|
|
610 continue;
|
|
|
611 }
|
|
|
612
|
|
|
613 events = 0;
|
|
|
614
|
|
58
|
615 if (c->read->active && c->read->handler) {
|
|
0
|
616 events |= POLLIN;
|
|
|
617 }
|
|
|
618
|
|
58
|
619 if (c->write->active && c->write->handler) {
|
|
0
|
620 events |= POLLOUT;
|
|
|
621 }
|
|
|
622
|
|
|
623 if (events == 0) {
|
|
|
624 continue;
|
|
|
625 }
|
|
|
626
|
|
|
627 overflow_list[n].fd = c->fd;
|
|
|
628 overflow_list[n].events = events;
|
|
|
629 overflow_list[n].revents = 0;
|
|
|
630 n++;
|
|
|
631 }
|
|
|
632
|
|
|
633 if (n == 0) {
|
|
|
634 break;
|
|
|
635 }
|
|
|
636
|
|
|
637 for ( ;; ) {
|
|
|
638 ready = poll(overflow_list, n, 0);
|
|
|
639
|
|
|
640 if (ready == -1) {
|
|
|
641 err = ngx_errno;
|
|
|
642 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
643 cycle->log, 0,
|
|
|
644 "poll() failed while the overflow recover");
|
|
|
645
|
|
|
646 if (err == NGX_EINTR) {
|
|
|
647 continue;
|
|
|
648 }
|
|
|
649 }
|
|
|
650
|
|
|
651 break;
|
|
|
652 }
|
|
|
653
|
|
|
654 if (ready <= 0) {
|
|
|
655 continue;
|
|
|
656 }
|
|
|
657
|
|
|
658 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
659 return NGX_ERROR;
|
|
|
660 }
|
|
|
661
|
|
|
662 for (i = 0; i < n; i++) {
|
|
92
|
663 c = cycle->files[overflow_list[i].fd];
|
|
0
|
664
|
|
|
665 rev = c->read;
|
|
|
666
|
|
|
667 if (rev->active
|
|
|
668 && !rev->closed
|
|
58
|
669 && rev->handler
|
|
0
|
670 && (overflow_list[i].revents
|
|
|
671 & (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
672 {
|
|
|
673 tested++;
|
|
|
674
|
|
|
675 if (ngx_threaded) {
|
|
|
676 rev->posted_ready = 1;
|
|
|
677 ngx_post_event(rev);
|
|
|
678
|
|
|
679 } else {
|
|
|
680 rev->ready = 1;
|
|
58
|
681 rev->handler(rev);
|
|
0
|
682 }
|
|
|
683 }
|
|
|
684
|
|
|
685 wev = c->write;
|
|
|
686
|
|
|
687 if (wev->active
|
|
|
688 && !wev->closed
|
|
58
|
689 && wev->handler
|
|
0
|
690 && (overflow_list[i].revents
|
|
|
691 & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
692 {
|
|
|
693 tested++;
|
|
|
694
|
|
|
695 if (ngx_threaded) {
|
|
|
696 wev->posted_ready = 1;
|
|
|
697 ngx_post_event(wev);
|
|
|
698
|
|
|
699 } else {
|
|
|
700 wev->ready = 1;
|
|
58
|
701 wev->handler(wev);
|
|
0
|
702 }
|
|
|
703 }
|
|
|
704 }
|
|
|
705
|
|
|
706 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
707
|
|
|
708 if (tested >= rtscf->overflow_test) {
|
|
|
709
|
|
|
710 if (ngx_linux_rtsig_max) {
|
|
|
711
|
|
|
712 /*
|
|
|
713 * Check the current rt queue length to prevent
|
|
|
714 * the new overflow.
|
|
|
715 *
|
|
|
716 * Learn the /proc/sys/kernel/rtsig-max value because
|
|
2
|
717 * it can be changed since the last checking.
|
|
0
|
718 */
|
|
|
719
|
|
|
720 name[0] = CTL_KERN;
|
|
|
721 name[1] = KERN_RTSIGMAX;
|
|
|
722 len = sizeof(rtsig_max);
|
|
42
|
723
|
|
|
724 if (sysctl(name, 2, &rtsig_max, &len, NULL, 0) == -1) {
|
|
0
|
725 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
726 "sysctl(KERN_RTSIGMAX) failed");
|
|
|
727 return NGX_ERROR;
|
|
|
728 }
|
|
|
729
|
|
42
|
730 /* name[0] = CTL_KERN; */
|
|
0
|
731 name[1] = KERN_RTSIGNR;
|
|
|
732 len = sizeof(rtsig_nr);
|
|
42
|
733
|
|
|
734 if (sysctl(name, 2, &rtsig_nr, &len, NULL, 0) == -1) {
|
|
0
|
735 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
736 "sysctl(KERN_RTSIGNR) failed");
|
|
|
737 return NGX_ERROR;
|
|
|
738 }
|
|
|
739
|
|
|
740 /*
|
|
|
741 * drain the rt signal queue if the /proc/sys/kernel/rtsig-nr
|
|
|
742 * is bigger than
|
|
|
743 * /proc/sys/kernel/rtsig-max / rtsig_overflow_threshold
|
|
|
744 */
|
|
|
745
|
|
|
746 if (rtsig_max / rtscf->overflow_threshold < rtsig_nr) {
|
|
|
747 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
748 "rtsig queue state: %d/%d",
|
|
|
749 rtsig_nr, rtsig_max);
|
|
|
750 while (ngx_rtsig_process_events(cycle) == NGX_OK) {
|
|
|
751 /* void */
|
|
|
752 }
|
|
|
753 }
|
|
|
754
|
|
|
755 } else {
|
|
|
756
|
|
|
757 /*
|
|
|
758 * Linux has not KERN_RTSIGMAX since 2.6.6-mm2
|
|
|
759 * so drain the rt signal queue unconditionally
|
|
|
760 */
|
|
|
761
|
|
|
762 while (ngx_rtsig_process_events(cycle) == NGX_OK) { /* void */ }
|
|
|
763 }
|
|
|
764
|
|
|
765 tested = 0;
|
|
|
766 }
|
|
|
767 }
|
|
|
768
|
|
|
769 if (ngx_posted_events) {
|
|
|
770 if (ngx_threaded) {
|
|
|
771 ngx_wakeup_worker_thread(cycle);
|
|
|
772
|
|
|
773 } else {
|
|
|
774 ngx_event_process_posted(cycle);
|
|
|
775 }
|
|
|
776 }
|
|
|
777
|
|
76
|
778 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
0
|
779 "rt signal queue overflow recovered");
|
|
|
780
|
|
|
781 overflow = 0;
|
|
|
782 ngx_event_actions.process_events = ngx_rtsig_process_events;
|
|
|
783
|
|
|
784 return NGX_OK;
|
|
|
785 }
|
|
|
786
|
|
|
787
|
|
48
|
788 static void *
|
|
|
789 ngx_rtsig_create_conf(ngx_cycle_t *cycle)
|
|
0
|
790 {
|
|
|
791 ngx_rtsig_conf_t *rtscf;
|
|
|
792
|
|
50
|
793 rtscf = ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t));
|
|
|
794 if (rtscf == NULL) {
|
|
|
795 return NGX_CONF_ERROR;
|
|
|
796 }
|
|
0
|
797
|
|
|
798 rtscf->signo = NGX_CONF_UNSET;
|
|
|
799 rtscf->overflow_events = NGX_CONF_UNSET;
|
|
|
800 rtscf->overflow_test = NGX_CONF_UNSET;
|
|
|
801 rtscf->overflow_threshold = NGX_CONF_UNSET;
|
|
|
802
|
|
|
803 return rtscf;
|
|
|
804 }
|
|
|
805
|
|
|
806
|
|
48
|
807 static char *
|
|
|
808 ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
809 {
|
|
|
810 ngx_rtsig_conf_t *rtscf = conf;
|
|
|
811
|
|
|
812 /* LinuxThreads use the first 3 RT signals */
|
|
|
813 ngx_conf_init_value(rtscf->signo, SIGRTMIN + 10);
|
|
|
814
|
|
|
815 ngx_conf_init_value(rtscf->overflow_events, 16);
|
|
|
816 ngx_conf_init_value(rtscf->overflow_test, 32);
|
|
|
817 ngx_conf_init_value(rtscf->overflow_threshold, 10);
|
|
|
818
|
|
|
819 return NGX_CONF_OK;
|
|
|
820 }
|
|
|
821
|
|
|
822
|
|
48
|
823 static char *
|
|
|
824 ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
|
|
0
|
825 void *post, void *data)
|
|
|
826 {
|
|
|
827 if (ngx_linux_rtsig_max) {
|
|
|
828 return ngx_conf_check_num_bounds(cf, post, data);
|
|
|
829 }
|
|
|
830
|
|
|
831 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
|
|
832 "\"rtsig_overflow_threshold\" is not supported "
|
|
|
833 "since Linux 2.6.6-mm2, ignored");
|
|
|
834
|
|
|
835 return NGX_CONF_OK;
|
|
|
836 }
|
