src/server/daemon/event_linux.c

Sat, 18 Feb 2017 13:27:25 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sat, 18 Feb 2017 13:27:25 +0100
branch
aio
changeset 172
5580517faafc
parent 152
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child 161
aadda87bad1b
child 185
b4d7ccf4e06d
permissions
-rw-r--r--

adds public aio and poll api and asynchronous send_range function

aio and poll api is only implemented on solaris yet
send_file saf uses send_range_aio for single range requests

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2013 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31 #include <errno.h>
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32 #include <sys/epoll.h>
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33
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34 #include "../util/systhr.h"
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35 #include "../util/atomic.h"
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36
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37
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38 #include "event.h"
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39 #include "event_linux.h"
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41
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42 event_handler_t* evhandler_create(int numthreads) {
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43 event_handler_t *ev = malloc(sizeof(event_handler_t));
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44 if(ev == NULL) {
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45 return NULL;
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46 }
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47
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48 ev->ep = calloc(numthreads, sizeof(int));
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49 if(ev->ep == NULL) {
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50 free(ev);
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51 return NULL;
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52 }
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53 ev->nep = numthreads;
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54 ev->lep = 0;
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55
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56 /* create ports event threads */
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57 for(int i=0;i<numthreads;i++) {
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58 /* create port */
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59 ev->ep[i] = epoll_create(64);
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60 if(ev->ep[i] == 0) {
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61 free(ev->ep);
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62 free(ev);
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63 return NULL;
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64 }
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65
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66 /*
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67 * start a new handler thread
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68 * the thread needs the event port and a pointer to the event handler
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69 */
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70 ev_thr_conf_t *conf = malloc(sizeof(ev_thr_conf_t));
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71 if(conf == NULL) {
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72 free(ev->ep);
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73 free(ev);
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74 return NULL;
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75 }
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76 conf->handler = ev;
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77 conf->ep = ev->ep[i];
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78
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79 systhread_start(0, 0, (thrstartfunc)ev_handle_events, conf);
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80 /* TODO: error handling */
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81 }
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82
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83 return ev;
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84 }
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86
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87 void ev_handle_events(ev_thr_conf_t *conf) {
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88 event_handler_t *ev = conf->handler;
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89 int ep = conf->ep;
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90
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91 free(conf);
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92
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93 //port_event_t events[16];
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94 struct epoll_event events[16];
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95
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96 for(;;) {
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97 /* wait for events */
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98 int ret = epoll_wait(ep, events, 16, 100000);
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99 if(ret == -1 && errno != EINTR) {
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100 log_ereport(LOG_FAILURE, "epoll_wait failed: %s", strerror(errno));
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101 continue;
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102 }
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103
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104 for(int i=0;i<ret;i++) {
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105 event_t *event = events[i].data.ptr;
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106 if(event->fn) {
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107 int saved_ev = event->poll;
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108 if(!event->fn(ev, event)) {
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109 // event fn returned 0 -> remove event from epoll
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110 if(epoll_ctl(ep, EPOLL_CTL_DEL, event->object, NULL)) {
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111 event->error = 1;
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112 log_ereport(
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113 LOG_FAILURE,
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114 "epoll_ctl failed: fd: %d error: %s",
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115 event->object,
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116 strerror(errno));
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117 }
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118
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119 // if set, execute event->finish
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120 if(event->finish) {
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121 event->finish(ev, event);
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122 }
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123 } else {
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124 if(saved_ev != event->poll) {
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125 // event type changed
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126 struct epoll_event epev;
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127 epev.events = EPOLLET;
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128 epev.data.ptr = event;
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129
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130 // adjust epoll events
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131 if((event->poll & EVENT_POLLIN) == EVENT_POLLIN) {
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132 epev.events |= EPOLLIN;
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133 }
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134 if((event->poll & EVENT_POLLOUT) == EVENT_POLLOUT) {
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135 epev.events |= EPOLLOUT;
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136 }
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137
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138 if(epoll_ctl(ep, EPOLL_CTL_MOD, event->object, NULL)) {
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139 log_ereport(
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140 LOG_FAILURE,
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141 "epoll_wait failed: %s",
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142 strerror(errno));
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143 }
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144 }
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145 }
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146 }
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147 }
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148 }
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149 }
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150
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151 /* returns a event handler port */
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152 int ev_get_port(event_handler_t *h) {
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153 int nps = h->nep;
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154 if(nps == 1) {
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155 return h->ep[0];
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156 }
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157
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158 int cp = h->lep % nps;
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159 ws_atomic_inc32(&h->lep);
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160
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161 return h->ep[cp];
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162 }
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163
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164 int ev_pollin(event_handler_t *h, int fd, event_t *event) {
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165 event->object = (intptr_t)fd;
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166 event->poll = EVENT_POLLIN;
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167 struct epoll_event epev;
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168 epev.events = EPOLLIN | EPOLLET; // input event, edge triggered
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169 epev.data.ptr = event;
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170 return epoll_ctl(ev_get_port(h), EPOLL_CTL_ADD, fd, &epev);
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171 }
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172
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173 int ev_pollout(event_handler_t *h, int fd, event_t *event) {
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174 event->object = (intptr_t)fd;
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175 event->poll = EVENT_POLLOUT;
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176 struct epoll_event epev;
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177 epev.events = EPOLLOUT | EPOLLET; // input event, edge triggered
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178 epev.data.ptr = event;
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179 return epoll_ctl(ev_get_port(h), EPOLL_CTL_ADD, fd, &epev);
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180 }
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181
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182 int evt_send(event_handler_t *h, event_t *event) {
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183 event->object = 0;
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184 // TODO: implement using threadpool or eventfd
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185 fprintf(stderr, "Warning: evt_send not implemented\n");
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186 return 0;
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187 }

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