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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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106
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286 ngx_msec_t timer, delta;
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0
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287 ngx_err_t err;
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288 siginfo_t si;
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289 ngx_event_t *rev, *wev;
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290 struct timeval tv;
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291 struct timespec ts, *tp;
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292 struct sigaction sa;
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293 ngx_connection_t *c;
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294 ngx_rtsig_conf_t *rtscf;
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295
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296 if (overflow) {
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297 timer = 0;
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298
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299 } else {
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106
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300 timer = ngx_event_find_timer();
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0
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301
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302 #if (NGX_THREADS)
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303
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106
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304 if (timer == NGX_TIMER_ERROR) {
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305 return NGX_ERROR;
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306 }
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0
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307
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106
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308 if (timer == NGX_TIMER_INFINITE || timer > 500) {
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309 timer = 500;
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310 break;
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311 }
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0
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312
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313 #endif
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314
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315 if (ngx_accept_mutex) {
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316 if (ngx_accept_disabled > 0) {
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317 ngx_accept_disabled--;
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318
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319 } else {
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320 ngx_accept_mutex_held = 0;
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321
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322 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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323 return NGX_ERROR;
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324 }
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325
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326 if (ngx_accept_mutex_held == 0
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327 && (timer == NGX_TIMER_INFINITE
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328 || timer > ngx_accept_mutex_delay))
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329 {
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330 timer = ngx_accept_mutex_delay;
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331 }
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332 }
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333 }
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334 }
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335
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336 if (timer == NGX_TIMER_INFINITE) {
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337 tp = NULL;
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338
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339 } else {
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340 ts.tv_sec = timer / 1000;
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341 ts.tv_nsec = (timer % 1000) * 1000000;
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342 tp = &ts;
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343 }
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344
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345 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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106
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346 "rtsig timer: %M", timer);
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0
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347
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348 /* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
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349
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350 signo = sigtimedwait(&set, &si, tp);
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351
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352 if (signo == -1) {
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353 err = ngx_errno;
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354
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355 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
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356 "rtsig signo:%d", signo);
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357
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358 if (err == NGX_EAGAIN) {
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359
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360 if (timer == NGX_TIMER_INFINITE) {
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361 ngx_accept_mutex_unlock();
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362 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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363 "sigtimedwait() returned EAGAIN without timeout");
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364 return NGX_ERROR;
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365 }
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366
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367 err = 0;
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368 }
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369
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370 } else {
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371 err = 0;
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372 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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10
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373 "rtsig signo:%d fd:%d band:%04Xd",
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0
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374 signo, si.si_fd, si.si_band);
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375 }
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376
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377 ngx_gettimeofday(&tv);
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378 ngx_time_update(tv.tv_sec);
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379
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106
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380 delta = ngx_current_time;
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381 ngx_current_time = (ngx_msec_t) tv.tv_sec * 1000 + tv.tv_usec / 1000;
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0
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382
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383 if (err) {
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384 ngx_accept_mutex_unlock();
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385 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
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386 cycle->log, err, "sigtimedwait() failed");
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387 return NGX_ERROR;
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388 }
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389
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390 if (timer != NGX_TIMER_INFINITE) {
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106
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391 delta = ngx_current_time - delta;
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0
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392
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393 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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106
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394 "rtsig timer: %M, delta: %M", timer, delta);
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0
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395 }
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396
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397 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
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398
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399 if (signo == rtscf->signo || signo == rtscf->signo + 1) {
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400
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|
|
401 if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
|
|
|
402 return NGX_OK;
|
|
|
403 }
|
|
|
404
|
|
100
|
405 c = ngx_cycle->files[si.si_fd];
|
|
|
406
|
|
|
407 if (c == NULL) {
|
|
|
408 /* the stale event */
|
|
0
|
409
|
|
100
|
410 ngx_accept_mutex_unlock();
|
|
|
411
|
|
|
412 return NGX_OK;
|
|
|
413 }
|
|
0
|
414
|
|
|
415 instance = signo - rtscf->signo;
|
|
|
416
|
|
|
417 rev = c->read;
|
|
|
418
|
|
|
419 if (c->read->instance != instance) {
|
|
|
420
|
|
|
421 /*
|
|
|
422 * the stale event from a file descriptor
|
|
|
423 * that was just closed in this iteration
|
|
|
424 */
|
|
|
425
|
|
|
426 ngx_accept_mutex_unlock();
|
|
|
427
|
|
|
428 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
10
|
429 "rtsig: stale event %p", c);
|
|
0
|
430
|
|
|
431 return NGX_OK;
|
|
|
432 }
|
|
|
433
|
|
|
434 if (si.si_band & (POLLIN|POLLHUP|POLLERR)) {
|
|
|
435 if (rev->active) {
|
|
|
436
|
|
|
437 if (ngx_threaded && !rev->accept) {
|
|
|
438 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
439 ngx_accept_mutex_unlock();
|
|
|
440 return NGX_ERROR;
|
|
|
441 }
|
|
|
442
|
|
|
443 rev->posted_ready = 1;
|
|
|
444 ngx_post_event(rev);
|
|
|
445
|
|
|
446 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
447
|
|
|
448 } else {
|
|
|
449 rev->ready = 1;
|
|
|
450
|
|
|
451 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
58
|
452 rev->handler(rev);
|
|
0
|
453
|
|
|
454 } else if (rev->accept) {
|
|
|
455 if (ngx_accept_disabled <= 0) {
|
|
58
|
456 rev->handler(rev);
|
|
0
|
457 }
|
|
|
458
|
|
|
459 } else {
|
|
|
460 ngx_post_event(rev);
|
|
|
461 }
|
|
|
462 }
|
|
|
463 }
|
|
|
464 }
|
|
|
465
|
|
|
466 wev = c->write;
|
|
|
467
|
|
|
468 if (si.si_band & (POLLOUT|POLLHUP|POLLERR)) {
|
|
|
469 if (wev->active) {
|
|
|
470
|
|
|
471 if (ngx_threaded) {
|
|
|
472 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
473 ngx_accept_mutex_unlock();
|
|
|
474 return NGX_ERROR;
|
|
|
475 }
|
|
|
476
|
|
|
477 wev->posted_ready = 1;
|
|
|
478 ngx_post_event(wev);
|
|
|
479
|
|
|
480 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
481
|
|
|
482 } else {
|
|
|
483 wev->ready = 1;
|
|
|
484
|
|
|
485 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
58
|
486 wev->handler(wev);
|
|
0
|
487
|
|
|
488 } else {
|
|
|
489 ngx_post_event(wev);
|
|
|
490 }
|
|
|
491 }
|
|
|
492 }
|
|
|
493 }
|
|
|
494
|
|
|
495 } else if (signo == SIGIO) {
|
|
|
496 ngx_accept_mutex_unlock();
|
|
|
497
|
|
|
498 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
499 "rt signal queue overflowed");
|
|
|
500
|
|
|
501 /* flush the RT signal queue */
|
|
|
502
|
|
|
503 ngx_memzero(&sa, sizeof(struct sigaction));
|
|
|
504 sa.sa_handler = SIG_DFL;
|
|
|
505 sigemptyset(&sa.sa_mask);
|
|
|
506
|
|
|
507 if (sigaction(rtscf->signo, &sa, NULL) == -1) {
|
|
|
508 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
509 "sigaction(%d, SIG_DFL) failed", rtscf->signo);
|
|
|
510 }
|
|
|
511
|
|
|
512 if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
|
|
|
513 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
|
|
514 "sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
|
|
|
515 }
|
|
|
516
|
|
|
517 overflow = 1;
|
|
|
518 overflow_current = 0;
|
|
|
519 ngx_event_actions.process_events = ngx_rtsig_process_overflow;
|
|
|
520
|
|
|
521 return NGX_ERROR;
|
|
|
522
|
|
|
523 } else if (signo != -1) {
|
|
|
524 ngx_accept_mutex_unlock();
|
|
|
525
|
|
|
526 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
527 "sigtimedwait() returned unexpected signal: %d", signo);
|
|
|
528
|
|
|
529 return NGX_ERROR;
|
|
|
530 }
|
|
|
531
|
|
|
532 ngx_accept_mutex_unlock();
|
|
|
533
|
|
106
|
534 ngx_event_expire_timers();
|
|
0
|
535
|
|
|
536 if (ngx_posted_events) {
|
|
|
537 if (ngx_threaded) {
|
|
|
538 ngx_wakeup_worker_thread(cycle);
|
|
|
539
|
|
|
540 } else {
|
|
|
541 ngx_event_process_posted(cycle);
|
|
|
542 }
|
|
|
543 }
|
|
|
544
|
|
|
545 if (signo == -1) {
|
|
|
546 return NGX_AGAIN;
|
|
|
547 } else {
|
|
|
548 return NGX_OK;
|
|
|
549 }
|
|
|
550 }
|
|
|
551
|
|
|
552
|
|
|
553 /* TODO: old cylces */
|
|
|
554
|
|
48
|
555 static ngx_int_t
|
|
|
556 ngx_rtsig_process_overflow(ngx_cycle_t *cycle)
|
|
0
|
557 {
|
|
|
558 int name[2], rtsig_max, rtsig_nr, events, ready;
|
|
|
559 size_t len;
|
|
|
560 ngx_int_t tested, n, i;
|
|
|
561 ngx_err_t err;
|
|
|
562 ngx_event_t *rev, *wev;
|
|
|
563 ngx_connection_t *c;
|
|
|
564 ngx_rtsig_conf_t *rtscf;
|
|
|
565
|
|
|
566 rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
|
|
567
|
|
|
568 tested = 0;
|
|
|
569
|
|
|
570 for ( ;; ) {
|
|
|
571
|
|
|
572 n = 0;
|
|
|
573 while (n < rtscf->overflow_events) {
|
|
|
574
|
|
|
575 if (overflow_current == cycle->connection_n) {
|
|
|
576 break;
|
|
|
577 }
|
|
|
578
|
|
92
|
579 c = cycle->files[overflow_current++];
|
|
0
|
580
|
|
|
581 if (c->fd == -1) {
|
|
|
582 continue;
|
|
|
583 }
|
|
|
584
|
|
|
585 events = 0;
|
|
|
586
|
|
58
|
587 if (c->read->active && c->read->handler) {
|
|
0
|
588 events |= POLLIN;
|
|
|
589 }
|
|
|
590
|
|
58
|
591 if (c->write->active && c->write->handler) {
|
|
0
|
592 events |= POLLOUT;
|
|
|
593 }
|
|
|
594
|
|
|
595 if (events == 0) {
|
|
|
596 continue;
|
|
|
597 }
|
|
|
598
|
|
|
599 overflow_list[n].fd = c->fd;
|
|
|
600 overflow_list[n].events = events;
|
|
|
601 overflow_list[n].revents = 0;
|
|
|
602 n++;
|
|
|
603 }
|
|
|
604
|
|
|
605 if (n == 0) {
|
|
|
606 break;
|
|
|
607 }
|
|
|
608
|
|
|
609 for ( ;; ) {
|
|
|
610 ready = poll(overflow_list, n, 0);
|
|
|
611
|
|
|
612 if (ready == -1) {
|
|
|
613 err = ngx_errno;
|
|
|
614 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
|
615 cycle->log, 0,
|
|
|
616 "poll() failed while the overflow recover");
|
|
|
617
|
|
|
618 if (err == NGX_EINTR) {
|
|
|
619 continue;
|
|
|
620 }
|
|
|
621 }
|
|
|
622
|
|
|
623 break;
|
|
|
624 }
|
|
|
625
|
|
|
626 if (ready <= 0) {
|
|
|
627 continue;
|
|
|
628 }
|
|
|
629
|
|
|
630 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
631 return NGX_ERROR;
|
|
|
632 }
|
|
|
633
|
|
|
634 for (i = 0; i < n; i++) {
|
|
92
|
635 c = cycle->files[overflow_list[i].fd];
|
|
0
|
636
|
|
|
637 rev = c->read;
|
|
|
638
|
|
|
639 if (rev->active
|
|
|
640 && !rev->closed
|
|
58
|
641 && rev->handler
|
|
0
|
642 && (overflow_list[i].revents
|
|
|
643 & (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
644 {
|
|
|
645 tested++;
|
|
|
646
|
|
|
647 if (ngx_threaded) {
|
|
|
648 rev->posted_ready = 1;
|
|
|
649 ngx_post_event(rev);
|
|
|
650
|
|
|
651 } else {
|
|
|
652 rev->ready = 1;
|
|
58
|
653 rev->handler(rev);
|
|
0
|
654 }
|
|
|
655 }
|
|
|
656
|
|
|
657 wev = c->write;
|
|
|
658
|
|
|
659 if (wev->active
|
|
|
660 && !wev->closed
|
|
58
|
661 && wev->handler
|
|
0
|
662 && (overflow_list[i].revents
|
|
|
663 & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
|
|
|
664 {
|
|
|
665 tested++;
|
|
|
666
|
|
|
667 if (ngx_threaded) {
|
|
|
668 wev->posted_ready = 1;
|
|
|
669 ngx_post_event(wev);
|
|
|
670
|
|
|
671 } else {
|
|
|
672 wev->ready = 1;
|
|
58
|
673 wev->handler(wev);
|
|
0
|
674 }
|
|
|
675 }
|
|
|
676 }
|
|
|
677
|
|
|
678 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
679
|
|
|
680 if (tested >= rtscf->overflow_test) {
|
|
|
681
|
|
|
682 if (ngx_linux_rtsig_max) {
|
|
|
683
|
|
|
684 /*
|
|
|
685 * Check the current rt queue length to prevent
|
|
|
686 * the new overflow.
|
|
|
687 *
|
|
|
688 * Learn the /proc/sys/kernel/rtsig-max value because
|
|
2
|
689 * it can be changed since the last checking.
|
|
0
|
690 */
|
|
|
691
|
|
|
692 name[0] = CTL_KERN;
|
|
|
693 name[1] = KERN_RTSIGMAX;
|
|
|
694 len = sizeof(rtsig_max);
|
|
42
|
695
|
|
|
696 if (sysctl(name, 2, &rtsig_max, &len, NULL, 0) == -1) {
|
|
0
|
697 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
698 "sysctl(KERN_RTSIGMAX) failed");
|
|
|
699 return NGX_ERROR;
|
|
|
700 }
|
|
|
701
|
|
42
|
702 /* name[0] = CTL_KERN; */
|
|
0
|
703 name[1] = KERN_RTSIGNR;
|
|
|
704 len = sizeof(rtsig_nr);
|
|
42
|
705
|
|
|
706 if (sysctl(name, 2, &rtsig_nr, &len, NULL, 0) == -1) {
|
|
0
|
707 ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
|
|
708 "sysctl(KERN_RTSIGNR) failed");
|
|
|
709 return NGX_ERROR;
|
|
|
710 }
|
|
|
711
|
|
|
712 /*
|
|
|
713 * drain the rt signal queue if the /proc/sys/kernel/rtsig-nr
|
|
|
714 * is bigger than
|
|
|
715 * /proc/sys/kernel/rtsig-max / rtsig_overflow_threshold
|
|
|
716 */
|
|
|
717
|
|
|
718 if (rtsig_max / rtscf->overflow_threshold < rtsig_nr) {
|
|
|
719 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
|
720 "rtsig queue state: %d/%d",
|
|
|
721 rtsig_nr, rtsig_max);
|
|
|
722 while (ngx_rtsig_process_events(cycle) == NGX_OK) {
|
|
|
723 /* void */
|
|
|
724 }
|
|
|
725 }
|
|
|
726
|
|
|
727 } else {
|
|
|
728
|
|
|
729 /*
|
|
|
730 * Linux has not KERN_RTSIGMAX since 2.6.6-mm2
|
|
|
731 * so drain the rt signal queue unconditionally
|
|
|
732 */
|
|
|
733
|
|
|
734 while (ngx_rtsig_process_events(cycle) == NGX_OK) { /* void */ }
|
|
|
735 }
|
|
|
736
|
|
|
737 tested = 0;
|
|
|
738 }
|
|
|
739 }
|
|
|
740
|
|
|
741 if (ngx_posted_events) {
|
|
|
742 if (ngx_threaded) {
|
|
|
743 ngx_wakeup_worker_thread(cycle);
|
|
|
744
|
|
|
745 } else {
|
|
|
746 ngx_event_process_posted(cycle);
|
|
|
747 }
|
|
|
748 }
|
|
|
749
|
|
76
|
750 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
0
|
751 "rt signal queue overflow recovered");
|
|
|
752
|
|
|
753 overflow = 0;
|
|
|
754 ngx_event_actions.process_events = ngx_rtsig_process_events;
|
|
|
755
|
|
|
756 return NGX_OK;
|
|
|
757 }
|
|
|
758
|
|
|
759
|
|
48
|
760 static void *
|
|
|
761 ngx_rtsig_create_conf(ngx_cycle_t *cycle)
|
|
0
|
762 {
|
|
|
763 ngx_rtsig_conf_t *rtscf;
|
|
|
764
|
|
50
|
765 rtscf = ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t));
|
|
|
766 if (rtscf == NULL) {
|
|
|
767 return NGX_CONF_ERROR;
|
|
|
768 }
|
|
0
|
769
|
|
|
770 rtscf->signo = NGX_CONF_UNSET;
|
|
|
771 rtscf->overflow_events = NGX_CONF_UNSET;
|
|
|
772 rtscf->overflow_test = NGX_CONF_UNSET;
|
|
|
773 rtscf->overflow_threshold = NGX_CONF_UNSET;
|
|
|
774
|
|
|
775 return rtscf;
|
|
|
776 }
|
|
|
777
|
|
|
778
|
|
48
|
779 static char *
|
|
|
780 ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
781 {
|
|
|
782 ngx_rtsig_conf_t *rtscf = conf;
|
|
|
783
|
|
|
784 /* LinuxThreads use the first 3 RT signals */
|
|
|
785 ngx_conf_init_value(rtscf->signo, SIGRTMIN + 10);
|
|
|
786
|
|
|
787 ngx_conf_init_value(rtscf->overflow_events, 16);
|
|
|
788 ngx_conf_init_value(rtscf->overflow_test, 32);
|
|
|
789 ngx_conf_init_value(rtscf->overflow_threshold, 10);
|
|
|
790
|
|
|
791 return NGX_CONF_OK;
|
|
|
792 }
|
|
|
793
|
|
|
794
|
|
48
|
795 static char *
|
|
|
796 ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
|
|
0
|
797 void *post, void *data)
|
|
|
798 {
|
|
|
799 if (ngx_linux_rtsig_max) {
|
|
|
800 return ngx_conf_check_num_bounds(cf, post, data);
|
|
|
801 }
|
|
|
802
|
|
|
803 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
|
|
804 "\"rtsig_overflow_threshold\" is not supported "
|
|
|
805 "since Linux 2.6.6-mm2, ignored");
|
|
|
806
|
|
|
807 return NGX_CONF_OK;
|
|
|
808 }
|
