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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 #ifndef _NGX_EVENT_H_INCLUDED_
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8 #define _NGX_EVENT_H_INCLUDED_
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9
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10
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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13
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14
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15 #define NGX_INVALID_INDEX 0xd0d0d0d0
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16
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17
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18 #if (HAVE_IOCP)
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19
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20 typedef struct {
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21 WSAOVERLAPPED ovlp;
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22 ngx_event_t *event;
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23 int error;
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24 } ngx_event_ovlp_t;
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25
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26 #endif
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27
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28
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29 typedef struct {
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30 ngx_uint_t lock;
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31
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32 ngx_event_t *events;
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33 ngx_event_t *last;
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34 } ngx_event_mutex_t;
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35
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36
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37 struct ngx_event_s {
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38 void *data;
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39
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40 unsigned write:1;
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41
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42 unsigned accept:1;
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43
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44 unsigned oneshot:1;
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45
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46 /* used to detect the stale events in kqueue, rt signals and epoll */
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47 unsigned instance:1;
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48
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49 /*
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50 * the event was passed or would be passed to a kernel;
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51 * in aio mode - operation was posted.
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52 */
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53 unsigned active:1;
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54
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55 unsigned disabled:1;
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56
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57 /* the ready event; in aio mode 0 means that no operation can be posted */
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58 unsigned ready:1;
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59
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60 /* aio operation is complete */
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61 unsigned complete:1;
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62
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63 unsigned eof:1;
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64 unsigned error:1;
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65
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66 unsigned timedout:1;
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67 unsigned timer_set:1;
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68
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69 unsigned delayed:1;
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70
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71 unsigned read_discarded:1;
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72
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73 unsigned unexpected_eof:1;
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74
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75 unsigned deferred_accept:1;
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76
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77 /* the pending eof reported by kqueue or in aio chain operation */
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78 unsigned pending_eof:1;
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79
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80 #if !(NGX_THREADS)
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81 unsigned posted_ready:1;
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82 #endif
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83
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84 #if (WIN32)
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85 /* setsockopt(SO_UPDATE_ACCEPT_CONTEXT) was succesfull */
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86 unsigned accept_context_updated:1;
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87 #endif
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88
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89 #if (HAVE_KQUEUE)
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90 unsigned kq_vnode:1;
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91
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92 /* the pending errno reported by kqueue */
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93 int kq_errno;
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94 #endif
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95
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96 /*
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97 * kqueue only:
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98 * accept: number of sockets that wait to be accepted
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99 * read: bytes to read when event is ready
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100 * or lowat when event is set with NGX_LOWAT_EVENT flag
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101 * write: available space in buffer when event is ready
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102 * or lowat when event is set with NGX_LOWAT_EVENT flag
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103 *
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104 * iocp: TODO
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105 *
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106 * otherwise:
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107 * accept: 1 if accept many, 0 otherwise
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108 */
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109
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110 #if (HAVE_KQUEUE) || (HAVE_IOCP)
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111 int available;
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112 #else
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113 unsigned available:1;
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114 #endif
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115
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116 /* TODO rename to handler */
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117 ngx_event_handler_pt event_handler;
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118
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119
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120 #if (HAVE_AIO)
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121
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122 #if (HAVE_IOCP)
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123 ngx_event_ovlp_t ovlp;
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124 #else
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125 struct aiocb aiocb;
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126 #endif
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127
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128 #endif
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129
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130 u_int index;
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131
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132 ngx_log_t *log;
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133
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134 /* TODO: threads: padding to cache line */
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135
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136 /*
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137 * STUB: The inline of "ngx_rbtree_t rbtree;"
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138 */
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139
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140 ngx_int_t rbtree_key;
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141 void *rbtree_left;
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142 void *rbtree_right;
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143 void *rbtree_parent;
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144 char rbtree_color;
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145
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146
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147 unsigned closed:1;
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148
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149 #if (NGX_THREADS)
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150
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151 unsigned locked:1;
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152
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153 unsigned posted_ready:1;
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154 unsigned posted_timedout:1;
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155 unsigned posted_eof:1;
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156
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157 #if (HAVE_KQUEUE)
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158 /* the pending errno reported by kqueue */
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159 int posted_errno;
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160 #endif
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161
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162 #if (HAVE_KQUEUE) || (HAVE_IOCP)
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163 int posted_available;
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164 #else
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165 unsigned posted_available:1;
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166 #endif
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167
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168 ngx_atomic_t *lock;
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169 ngx_atomic_t *own_lock;
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170
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171 #endif
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172
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173 /* the links of the posted queue */
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174 ngx_event_t *next;
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175 ngx_event_t **prev;
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176
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177
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178 #if 0
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179
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180 /* the threads support */
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181
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182 /*
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183 * the event thread context, we store it here
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184 * if $(CC) does not understand __thread declaration
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185 * and pthread_getspecific() is too costly
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186 */
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187
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188 void *thr_ctx;
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189
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190 #if (NGX_EVENT_T_PADDING)
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191
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192 /* event should not cross cache line in SMP */
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193
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194 int padding[NGX_EVENT_T_PADDING];
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195 #endif
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196 #endif
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197 };
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198
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199
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200 typedef struct {
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201 ngx_int_t (*add)(ngx_event_t *ev, int event, u_int flags);
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202 ngx_int_t (*del)(ngx_event_t *ev, int event, u_int flags);
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203
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204 ngx_int_t (*enable)(ngx_event_t *ev, int event, u_int flags);
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205 ngx_int_t (*disable)(ngx_event_t *ev, int event, u_int flags);
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206
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207 ngx_int_t (*add_conn)(ngx_connection_t *c);
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208 ngx_int_t (*del_conn)(ngx_connection_t *c, u_int flags);
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209
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2
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210 ngx_int_t (*process_changes)(ngx_cycle_t *cycle, ngx_uint_t nowait);
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0
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211 ngx_int_t (*process_events)(ngx_cycle_t *cycle);
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212
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213 ngx_int_t (*init)(ngx_cycle_t *cycle);
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214 void (*done)(ngx_cycle_t *cycle);
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215 } ngx_event_actions_t;
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216
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217
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218 extern ngx_event_actions_t ngx_event_actions;
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219
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220
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221 /*
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222 * The event filter requires to read/write the whole data -
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223 * select, poll, /dev/poll, kqueue, epoll.
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224 */
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225 #define NGX_USE_LEVEL_EVENT 0x00000001
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226
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227 /*
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228 * The event filter is deleted after a notification without an additional
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229 * syscall - select, poll, kqueue, epoll, Solaris 10's event ports.
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230 */
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231 #define NGX_USE_ONESHOT_EVENT 0x00000002
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232
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233 /*
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234 * The event filter notifies only the changes and an initial level -
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235 * kqueue, epoll.
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236 */
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237 #define NGX_USE_CLEAR_EVENT 0x00000004
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238
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239 /*
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240 * The event filter has kqueue features - the eof flag, errno,
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241 * available data, etc.
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242 */
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4
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243 #define NGX_USE_KQUEUE_EVENT 0x00000008
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0
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244
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245 /*
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246 * The event filter supports low water mark - kqueue's NOTE_LOWAT.
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247 * kqueue in FreeBSD 4.1-4.2 has no NOTE_LOWAT so we need a separate flag.
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248 */
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4
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249 #define NGX_USE_LOWAT_EVENT 0x00000010
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0
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250
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251 /*
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252 * The event filter requires to do i/o operation until EAGAIN -
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253 * epoll, rt signals.
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254 */
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4
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255 #define NGX_USE_GREEDY_EVENT 0x00000020
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0
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256
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257 /*
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258 * The event filter is epoll,
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259 */
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260 #define NGX_USE_EPOLL_EVENT 0x00000040
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261
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262 /*
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263 * No need to add or delete the event filters - rt signals.
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264 */
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265 #define NGX_USE_RTSIG_EVENT 0x00000080
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266
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267 /*
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268 * No need to add or delete the event filters - overlapped, aio_read,
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269 * aioread, io_submit.
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270 */
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271 #define NGX_USE_AIO_EVENT 0x00000100
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272
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273 /*
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274 * Need to add socket or handle only once - i/o completion port.
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275 * It also requires HAVE_AIO and NGX_USE_AIO_EVENT to be set.
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276 */
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277 #define NGX_USE_IOCP_EVENT 0x00000200
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278
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279
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280
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281 /*
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282 * The event filter is deleted before the closing file.
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283 * Has no meaning for select, poll, epoll.
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284 *
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285 * kqueue: kqueue deletes event filters for file that closed
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286 * so we need only to delete filters in user-level batch array
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287 * /dev/poll: we need to flush POLLREMOVE event before closing file
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288 */
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289
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290 #define NGX_CLOSE_EVENT 1
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291 #define NGX_DISABLE_EVENT 2
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292
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293
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294 /* these flags have a meaning only for kqueue */
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295 #define NGX_LOWAT_EVENT 0
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296 #define NGX_VNODE_EVENT 0
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297
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298
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299 #if (HAVE_KQUEUE)
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300
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301 #define NGX_READ_EVENT EVFILT_READ
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302 #define NGX_WRITE_EVENT EVFILT_WRITE
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303
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304 #undef NGX_VNODE_EVENT
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305 #define NGX_VNODE_EVENT EVFILT_VNODE
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306
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307 /*
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308 * NGX_CLOSE_EVENT and NGX_LOWAT_EVENT are the module flags and they would
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309 * not go into a kernel so we need to choose the value that would not interfere
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310 * with any existent and future kqueue flags. kqueue has such values -
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311 * EV_FLAG1, EV_EOF and EV_ERROR. They are reserved and cleared on a kernel
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312 * entrance.
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313 */
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314 #undef NGX_CLOSE_EVENT
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315 #define NGX_CLOSE_EVENT EV_EOF
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316
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317 #undef NGX_LOWAT_EVENT
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318 #define NGX_LOWAT_EVENT EV_FLAG1
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319
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320 #define NGX_LEVEL_EVENT 0
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321 #define NGX_ONESHOT_EVENT EV_ONESHOT
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322 #define NGX_CLEAR_EVENT EV_CLEAR
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323
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324 #undef NGX_DISABLE_EVENT
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325 #define NGX_DISABLE_EVENT EV_DISABLE
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326
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327
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328 #elif (HAVE_DEVPOLL)
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329
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330 #define NGX_READ_EVENT POLLIN
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331 #define NGX_WRITE_EVENT POLLOUT
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332
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333 #define NGX_LEVEL_EVENT 0
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334 #define NGX_ONESHOT_EVENT 1
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335
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336
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337 #elif (HAVE_EPOLL)
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338
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339 #define NGX_READ_EVENT EPOLLIN
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340 #define NGX_WRITE_EVENT EPOLLOUT
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341
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342 #define NGX_LEVEL_EVENT 0
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343 #define NGX_CLEAR_EVENT EPOLLET
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344 #define NGX_ONESHOT_EVENT 0x70000000
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345 #if 0
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346 #define NGX_ONESHOT_EVENT EPOLLONESHOT
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347 #endif
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348
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349
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350 #elif (HAVE_POLL)
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351
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352 #define NGX_READ_EVENT POLLIN
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353 #define NGX_WRITE_EVENT POLLOUT
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354
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355 #define NGX_LEVEL_EVENT 0
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356 #define NGX_ONESHOT_EVENT 1
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357
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358
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359 #else /* select */
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360
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361 #define NGX_READ_EVENT 0
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362 #define NGX_WRITE_EVENT 1
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363
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364 #define NGX_LEVEL_EVENT 0
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365 #define NGX_ONESHOT_EVENT 1
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366
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367 #endif /* HAVE_KQUEUE */
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368
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369
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370 #if (HAVE_IOCP)
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371 #define NGX_IOCP_ACCEPT 0
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372 #define NGX_IOCP_IO 1
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373 #define NGX_IOCP_CONNECT 2
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374 #endif
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375
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376
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377 #ifndef NGX_CLEAR_EVENT
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378 #define NGX_CLEAR_EVENT 0 /* dummy declaration */
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379 #endif
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380
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381
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382 #define ngx_process_changes ngx_event_actions.process_changes
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383 #define ngx_process_events ngx_event_actions.process_events
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384 #define ngx_done_events ngx_event_actions.done
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385
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386 #define ngx_add_event ngx_event_actions.add
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387 #define ngx_del_event ngx_event_actions.del
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388 #define ngx_add_conn ngx_event_actions.add_conn
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389 #define ngx_del_conn ngx_event_actions.del_conn
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390
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391 #define ngx_add_timer ngx_event_add_timer
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392 #define ngx_del_timer ngx_event_del_timer
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393
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394
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395 #define ngx_recv ngx_io.recv
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396 #define ngx_recv_chain ngx_io.recv_chain
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397 #define ngx_send ngx_io.send
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398 #define ngx_send_chain ngx_io.send_chain
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399
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400
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401
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402 #define NGX_EVENT_MODULE 0x544E5645 /* "EVNT" */
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403 #define NGX_EVENT_CONF 0x02000000
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404
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405
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406 typedef struct {
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407 ngx_uint_t connections;
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408 ngx_uint_t use;
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409
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410 ngx_flag_t multi_accept;
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411 ngx_flag_t accept_mutex;
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412
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413 ngx_msec_t accept_mutex_delay;
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414
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415 u_char *name;
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416
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417 #if (NGX_DEBUG)
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418 ngx_array_t debug_connection;
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419 #endif
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420 } ngx_event_conf_t;
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421
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422
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423 typedef struct {
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424 ngx_str_t *name;
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425
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426 void *(*create_conf)(ngx_cycle_t *cycle);
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427 char *(*init_conf)(ngx_cycle_t *cycle, void *conf);
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428
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429 ngx_event_actions_t actions;
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430 } ngx_event_module_t;
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431
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432
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433 extern ngx_atomic_t *ngx_connection_counter;
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434
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435 extern ngx_atomic_t *ngx_accept_mutex_ptr;
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436 extern ngx_atomic_t *ngx_accept_mutex;
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437 extern ngx_uint_t ngx_accept_mutex_held;
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438 extern ngx_msec_t ngx_accept_mutex_delay;
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439 extern ngx_int_t ngx_accept_disabled;
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440
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441
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442 #if (NGX_STAT_STUB)
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443
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444 extern ngx_atomic_t *ngx_stat_accepted;
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445 extern ngx_atomic_t *ngx_stat_requests;
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446 extern ngx_atomic_t *ngx_stat_active;
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447 extern ngx_atomic_t *ngx_stat_reading;
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448 extern ngx_atomic_t *ngx_stat_writing;
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449
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450 #endif
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451
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452
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453
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454 #define ngx_accept_mutex_unlock() \
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455 if (ngx_accept_mutex_held) { \
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456 *ngx_accept_mutex = 0; \
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457 }
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458
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459
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460 extern ngx_uint_t ngx_event_flags;
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461 extern ngx_module_t ngx_events_module;
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462 extern ngx_module_t ngx_event_core_module;
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463
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464
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465 #define ngx_event_get_conf(conf_ctx, module) \
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466 (*(ngx_get_conf(conf_ctx, ngx_events_module))) [module.ctx_index];
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467
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468
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469
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470 void ngx_event_accept(ngx_event_t *ev);
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471 ngx_int_t ngx_trylock_accept_mutex(ngx_cycle_t *cycle);
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472 ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle);
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473 ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle);
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474
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475
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476 #if (WIN32)
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477 void ngx_event_acceptex(ngx_event_t *ev);
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478 int ngx_event_post_acceptex(ngx_listening_t *ls, int n);
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479 #endif
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480
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481
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2
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482 ngx_int_t ngx_send_lowat(ngx_connection_t *c, size_t lowat);
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483
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484
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0
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485 /* used in ngx_log_debugX() */
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486 #define ngx_event_ident(p) ((ngx_connection_t *) (p))->fd
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487
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488
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489 #include <ngx_event_timer.h>
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490 #include <ngx_event_posted.h>
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491 #include <ngx_event_busy_lock.h>
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492
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493 #if (WIN32)
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494 #include <ngx_iocp_module.h>
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495 #endif
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496
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497
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498
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499 ngx_inline static int ngx_handle_read_event(ngx_event_t *rev, u_int flags)
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500 {
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501 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
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502
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2
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503 /* kqueue, epoll */
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0
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504
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505 if (!rev->active && !rev->ready) {
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506 if (ngx_add_event(rev, NGX_READ_EVENT, NGX_CLEAR_EVENT)
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507 == NGX_ERROR) {
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508 return NGX_ERROR;
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509 }
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510 }
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511
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512 return NGX_OK;
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513
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514 } else if (ngx_event_flags & NGX_USE_LEVEL_EVENT) {
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515
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516 /* select, poll, /dev/poll */
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517
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518 if (!rev->active && !rev->ready) {
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519 if (ngx_add_event(rev, NGX_READ_EVENT, NGX_LEVEL_EVENT)
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520 == NGX_ERROR)
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521 {
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522 return NGX_ERROR;
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523 }
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524
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525 return NGX_OK;
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526 }
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527
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528 if (rev->active && (rev->ready || (flags & NGX_CLOSE_EVENT))) {
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529 if (ngx_del_event(rev, NGX_READ_EVENT, flags) == NGX_ERROR) {
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530 return NGX_ERROR;
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531 }
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532
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533 return NGX_OK;
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534 }
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535 }
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536
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2
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537 /* aio, iocp, rtsig */
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0
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538
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539 return NGX_OK;
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540 }
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541
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542
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543 ngx_inline static int ngx_handle_level_read_event(ngx_event_t *rev)
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544 {
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545 if (ngx_event_flags & NGX_USE_LEVEL_EVENT) {
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546 if (!rev->active && !rev->ready) {
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547 if (ngx_add_event(rev, NGX_READ_EVENT, NGX_LEVEL_EVENT)
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548 == NGX_ERROR)
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549 {
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550 return NGX_ERROR;
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551 }
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552
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553 return NGX_OK;
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554 }
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555
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556 if (rev->active && rev->ready) {
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557 if (ngx_del_event(rev, NGX_READ_EVENT, 0) == NGX_ERROR) {
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558 return NGX_ERROR;
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559 }
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560
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561 return NGX_OK;
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562 }
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563 }
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564
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565 return NGX_OK;
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566 }
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567
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568
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2
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569 ngx_inline static int ngx_handle_write_event(ngx_event_t *wev, size_t lowat)
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0
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570 {
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2
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571 ngx_connection_t *c;
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572
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573 if (lowat) {
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4
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574 c = (ngx_connection_t *) wev->data;
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2
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575
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576 if (ngx_send_lowat(c, lowat) == NGX_ERROR) {
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577 return NGX_ERROR;
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578 }
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579 }
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580
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0
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581 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
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582
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2
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583 /* kqueue, epoll */
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0
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584
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585 if (!wev->active && !wev->ready) {
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2
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586 if (ngx_add_event(wev, NGX_WRITE_EVENT,
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587 NGX_CLEAR_EVENT | (lowat ? NGX_LOWAT_EVENT : 0))
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0
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588 == NGX_ERROR)
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589 {
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590 return NGX_ERROR;
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591 }
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592 }
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593
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594 return NGX_OK;
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595
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596 } else if (ngx_event_flags & NGX_USE_LEVEL_EVENT) {
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597
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598 /* select, poll, /dev/poll */
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599
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600 if (!wev->active && !wev->ready) {
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601 if (ngx_add_event(wev, NGX_WRITE_EVENT, NGX_LEVEL_EVENT)
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602 == NGX_ERROR)
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603 {
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604 return NGX_ERROR;
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605 }
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606
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607 return NGX_OK;
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608 }
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609
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610 if (wev->active && wev->ready) {
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611 if (ngx_del_event(wev, NGX_WRITE_EVENT, 0) == NGX_ERROR) {
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612 return NGX_ERROR;
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613 }
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614
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615 return NGX_OK;
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616 }
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617 }
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618
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2
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619 /* aio, iocp, rtsig */
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0
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620
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621 return NGX_OK;
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622 }
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623
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624
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625 ngx_inline static int ngx_handle_level_write_event(ngx_event_t *wev)
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626 {
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627 if (ngx_event_flags & NGX_USE_LEVEL_EVENT) {
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628 if (!wev->active && !wev->ready) {
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629 if (ngx_add_event(wev, NGX_WRITE_EVENT, NGX_LEVEL_EVENT)
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630 == NGX_ERROR)
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631 {
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632 return NGX_ERROR;
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633 }
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634
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635 return NGX_OK;
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636 }
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637
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638 if (wev->active && wev->ready) {
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639 if (ngx_del_event(wev, NGX_WRITE_EVENT, 0) == NGX_ERROR) {
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640 return NGX_ERROR;
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641 }
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642
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643 return NGX_OK;
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644 }
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645 }
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646
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647 return NGX_OK;
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648 }
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649
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650
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651 #endif /* _NGX_EVENT_H_INCLUDED_ */
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