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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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18
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12 #if (NGX_HAVE_KQUEUE)
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0
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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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48
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17 static ngx_int_t ngx_aio_init(ngx_cycle_t *cycle);
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0
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18 static void ngx_aio_done(ngx_cycle_t *cycle);
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48
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19 static ngx_int_t ngx_aio_add_event(ngx_event_t *ev, int event, u_int flags);
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20 static ngx_int_t ngx_aio_del_event(ngx_event_t *ev, int event, u_int flags);
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21 static ngx_int_t ngx_aio_del_connection(ngx_connection_t *c, u_int flags);
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22 static ngx_int_t ngx_aio_process_events(ngx_cycle_t *cycle);
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0
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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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18
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30 0
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0
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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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58
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57 NGX_MODULE_V1,
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0
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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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90
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61 NULL, /* init master */
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0
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62 NULL, /* init module */
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90
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63 NULL, /* init process */
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64 NULL, /* init thread */
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65 NULL, /* exit thread */
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66 NULL, /* exit process */
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67 NULL, /* exit master */
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68 NGX_MODULE_V1_PADDING
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0
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69 };
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70
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71
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72
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18
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73 #if (NGX_HAVE_KQUEUE)
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0
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74
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48
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75 static ngx_int_t
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76 ngx_aio_init(ngx_cycle_t *cycle)
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0
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77 {
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78 if (ngx_kqueue_module_ctx.actions.init(cycle) == NGX_ERROR) {
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79 return NGX_ERROR;
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80 }
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81
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82 ngx_io = ngx_os_aio;
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83
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84 ngx_event_flags = NGX_USE_AIO_EVENT;
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85 ngx_event_actions = ngx_aio_module_ctx.actions;
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86
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87
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88 return NGX_OK;
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89 }
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90
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91
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48
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92 static void
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93 ngx_aio_done(ngx_cycle_t *cycle)
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0
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94 {
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95 ngx_kqueue_module_ctx.actions.done(cycle);
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96 }
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97
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98
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48
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99 /* the event adding and deleting are needed for the listening sockets */
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0
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100
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48
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101 static ngx_int_t
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102 ngx_aio_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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103 {
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104 return ngx_kqueue_module_ctx.actions.add(ev, event, flags);
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105 }
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106
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107
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48
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108 static ngx_int_t
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109 ngx_aio_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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110 {
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111 return ngx_kqueue_module_ctx.actions.del(ev, event, flags);
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112 }
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113
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114
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48
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115 static ngx_int_t
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116 ngx_aio_del_connection(ngx_connection_t *c, u_int flags)
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0
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117 {
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118 int rc;
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119
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120 if (c->read->active == 0 && c->write->active == 0) {
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121 return NGX_OK;
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122 }
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123
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10
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124 if (flags & NGX_CLOSE_EVENT) {
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125 return NGX_OK;
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126 }
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127
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0
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128 rc = aio_cancel(c->fd, NULL);
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129
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130 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_cancel: %d", rc);
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131
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132 if (rc == AIO_CANCELED) {
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133 c->read->active = c->write->active = 0;
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134 return NGX_OK;
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135 }
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136
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137 if (rc == AIO_ALLDONE) {
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138 c->read->active = c->write->active = 0;
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139 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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140 "aio_cancel() returned AIO_ALLDONE");
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141 return NGX_OK;
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142 }
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143
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144 if (rc == -1) {
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145 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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146 "aio_cancel() failed");
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147 return NGX_ERROR;
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148 }
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149
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150 if (rc == AIO_NOTCANCELED) {
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151 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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152 "aio_cancel() returned AIO_NOTCANCELED");
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153
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154 return NGX_ERROR;
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155 }
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156
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157 return NGX_OK;
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158 }
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159
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160
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48
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161 static ngx_int_t
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162 ngx_aio_process_events(ngx_cycle_t *cycle)
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0
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163 {
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164 return ngx_kqueue_module_ctx.actions.process_events(cycle);
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165 }
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166
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18
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167 #endif /* NGX_HAVE_KQUEUE */
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0
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168
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169
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170 #if 0
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171
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172 /* 1 */
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173 int ngx_posix_aio_process_events(ngx_log_t *log)
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174 {
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175 listen via SIGIO;
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176 aio_* via SIGxxx;
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177
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178 sigsuspend()/sigwaitinfo()/sigtimedwait();
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179 }
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180
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181 /* 2 */
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182 int ngx_posix_aio_process_events(ngx_log_t *log)
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183 {
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184 unmask signal
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185
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186 listen via SIGIO;
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187
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188 /* BUG: SIGIO can be delivered before aio_*() */
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189
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190 aio_suspend()/aiowait()/aio_waitcomplete() with timeout
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191
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192 mask signal
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193
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194 if (ngx_socket_errno == NGX_EINTR)
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195 look listen
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196 select()/accept() nb listen sockets
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197 else
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198 aio
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199 }
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200
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201 /* 3 */
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202 int ngx_posix_aio_process_events(ngx_log_t *log)
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203 {
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204 #if 0
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205 unmask signal
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206
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207 /* BUG: AIO signal can be delivered before select() */
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208
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209 select(listen);
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210
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211 mask signal
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212 #endif
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213
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214 pselect(listen, mask);
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215
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216 if (ngx_socket_errno == NGX_EINTR)
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217 look ready array
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218 }
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219
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220 void aio_sig_handler(int signo, siginfo_t *siginfo, void *context)
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221 {
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222 push siginfo->si_value.sival_ptr
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223 }
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224
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225 #endif
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