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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 #include <ngx_aio.h>
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11
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12 #if (HAVE_KQUEUE)
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13 #include <ngx_kqueue_module.h>
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14 #endif
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15
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16
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17 static int ngx_aio_init(ngx_cycle_t *cycle);
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18 static void ngx_aio_done(ngx_cycle_t *cycle);
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19 static int ngx_aio_add_event(ngx_event_t *ev, int event, u_int flags);
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20 static int ngx_aio_del_event(ngx_event_t *ev, int event, u_int flags);
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21 static int ngx_aio_del_connection(ngx_connection_t *c, u_int flags);
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22 static int ngx_aio_process_events(ngx_cycle_t *cycle);
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23
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24
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25 ngx_os_io_t ngx_os_aio = {
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26 ngx_aio_read,
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27 ngx_aio_read_chain,
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28 ngx_aio_write,
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29 ngx_aio_write_chain,
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30 NGX_HAVE_ZEROCOPY
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31 };
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32
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33
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34 static ngx_str_t aio_name = ngx_string("aio");
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35
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36 ngx_event_module_t ngx_aio_module_ctx = {
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37 &aio_name,
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38 NULL, /* create configuration */
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39 NULL, /* init configuration */
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40
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41 {
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42 ngx_aio_add_event, /* add an event */
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43 ngx_aio_del_event, /* delete an event */
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44 NULL, /* enable an event */
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45 NULL, /* disable an event */
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46 NULL, /* add an connection */
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47 ngx_aio_del_connection, /* delete an connection */
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48 NULL, /* process the changes */
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49 ngx_aio_process_events, /* process the events */
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50 ngx_aio_init, /* init the events */
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51 ngx_aio_done /* done the events */
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52 }
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53
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54 };
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55
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56 ngx_module_t ngx_aio_module = {
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57 NGX_MODULE,
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58 &ngx_aio_module_ctx, /* module context */
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59 NULL, /* module directives */
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60 NGX_EVENT_MODULE, /* module type */
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61 NULL, /* init module */
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62 NULL /* init process */
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63 };
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64
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65
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66
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67 #if (HAVE_KQUEUE)
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68
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69 static int ngx_aio_init(ngx_cycle_t *cycle)
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70 {
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71 if (ngx_kqueue_module_ctx.actions.init(cycle) == NGX_ERROR) {
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72 return NGX_ERROR;
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73 }
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74
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75 ngx_io = ngx_os_aio;
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76
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77 ngx_event_flags = NGX_USE_AIO_EVENT;
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78 ngx_event_actions = ngx_aio_module_ctx.actions;
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79
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80
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81 return NGX_OK;
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82 }
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83
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84
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85 static void ngx_aio_done(ngx_cycle_t *cycle)
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86 {
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87 ngx_kqueue_module_ctx.actions.done(cycle);
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88 }
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89
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90
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91 /* The event adding and deleting are needed for the listening sockets */
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92
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93 static int ngx_aio_add_event(ngx_event_t *ev, int event, u_int flags)
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94 {
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95 return ngx_kqueue_module_ctx.actions.add(ev, event, flags);
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96 }
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97
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98
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99 static int ngx_aio_del_event(ngx_event_t *ev, int event, u_int flags)
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100 {
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101 return ngx_kqueue_module_ctx.actions.del(ev, event, flags);
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102 }
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103
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104
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105 static int ngx_aio_del_connection(ngx_connection_t *c, u_int flags)
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106 {
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107 int rc;
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108
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109 if (c->read->active == 0 && c->write->active == 0) {
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110 return NGX_OK;
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111 }
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112
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113 rc = aio_cancel(c->fd, NULL);
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114
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115 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_cancel: %d", rc);
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116
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117 if (rc == AIO_CANCELED) {
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118 c->read->active = c->write->active = 0;
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119 return NGX_OK;
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120 }
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121
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122 if (rc == AIO_ALLDONE) {
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123 c->read->active = c->write->active = 0;
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124 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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125 "aio_cancel() returned AIO_ALLDONE");
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126 return NGX_OK;
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127 }
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128
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129 if (rc == -1) {
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130 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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131 "aio_cancel() failed");
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132 return NGX_ERROR;
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133 }
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134
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135 if (rc == AIO_NOTCANCELED) {
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136 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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137 "aio_cancel() returned AIO_NOTCANCELED");
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138
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139 return NGX_ERROR;
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140 }
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141
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142 return NGX_OK;
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143 }
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144
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145
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146 static int ngx_aio_process_events(ngx_cycle_t *cycle)
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147 {
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148 return ngx_kqueue_module_ctx.actions.process_events(cycle);
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149 }
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150
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151 #endif /* HAVE_KQUEUE */
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152
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153
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154 #if 0
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155
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156 /* 1 */
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157 int ngx_posix_aio_process_events(ngx_log_t *log)
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158 {
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159 listen via SIGIO;
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160 aio_* via SIGxxx;
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161
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162 sigsuspend()/sigwaitinfo()/sigtimedwait();
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163 }
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164
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165 /* 2 */
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166 int ngx_posix_aio_process_events(ngx_log_t *log)
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167 {
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168 unmask signal
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169
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170 listen via SIGIO;
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171
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172 /* BUG: SIGIO can be delivered before aio_*() */
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173
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174 aio_suspend()/aiowait()/aio_waitcomplete() with timeout
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175
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176 mask signal
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177
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178 if (ngx_socket_errno == NGX_EINTR)
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179 look listen
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180 select()/accept() nb listen sockets
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181 else
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182 aio
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183 }
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184
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185 /* 3 */
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186 int ngx_posix_aio_process_events(ngx_log_t *log)
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187 {
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188 #if 0
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189 unmask signal
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190
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191 /* BUG: AIO signal can be delivered before select() */
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192
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193 select(listen);
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194
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195 mask signal
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196 #endif
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197
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198 pselect(listen, mask);
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199
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200 if (ngx_socket_errno == NGX_EINTR)
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201 look ready array
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202 }
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203
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204 void aio_sig_handler(int signo, siginfo_t *siginfo, void *context)
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205 {
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206 push siginfo->si_value.sival_ptr
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207 }
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208
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209 #endif
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