Merge branch 'master' of fludd.seatribe.se:/usr/local/src/ashd
[ashd.git] / lib / mtio-epoll.c
CommitLineData
a6cda4dd
FT
1/*
2 ashd - A Sane HTTP Daemon
3 Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com>
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17*/
18
19#include <stdlib.h>
4f6d772e
FT
20#include <unistd.h>
21#include <time.h>
be078ac9 22#include <fcntl.h>
a6cda4dd
FT
23#include <string.h>
24#include <sys/epoll.h>
25#include <errno.h>
26
27#ifdef HAVE_CONFIG_H
28#include <config.h>
29#endif
30#include <log.h>
31#include <utils.h>
32#include <mt.h>
33#include <mtio.h>
34
35static struct blocker *blockers;
36
37struct blocker {
38 struct blocker *n, *p, *n2, *p2;
39 int fd, reg;
40 int ev;
41 time_t to;
42 struct muth *th;
43};
44
45static int epfd = -1, fdln = 0;
9d32586e 46static int exitstatus;
a6cda4dd
FT
47static struct blocker **fdlist;
48
49static int regfd(struct blocker *bl)
50{
51 struct blocker *o;
52 struct epoll_event evd;
53
54 memset(&evd, 0, sizeof(evd));
55 evd.events = 0;
56 if(bl->ev & EV_READ)
57 evd.events |= EPOLLIN;
58 if(bl->ev & EV_WRITE)
59 evd.events |= EPOLLOUT;
60 evd.data.fd = bl->fd;
61 if(bl->fd >= fdln) {
62 if(fdlist) {
63 fdlist = srealloc(fdlist, sizeof(*fdlist) * (bl->fd + 1));
64 memset(fdlist + fdln, 0, sizeof(*fdlist) * (bl->fd + 1 - fdln));
65 fdln = bl->fd + 1;
66 } else {
67 fdlist = szmalloc(sizeof(*fdlist) * (fdln = (bl->fd + 1)));
68 }
69 }
70 if(fdlist[bl->fd] == NULL) {
71 if(epoll_ctl(epfd, EPOLL_CTL_ADD, bl->fd, &evd)) {
72 /* XXX?! Whatever to do, really? */
73 flog(LOG_ERR, "epoll_add on fd %i: %s", bl->fd, strerror(errno));
74 return(-1);
75 }
76 } else {
77 for(o = fdlist[bl->fd]; o; o = o->n2) {
78 if(o->ev & EV_READ)
79 evd.events |= EPOLLIN;
80 if(o->ev & EV_WRITE)
81 evd.events |= EPOLLOUT;
82 }
83 if(epoll_ctl(epfd, EPOLL_CTL_MOD, bl->fd, &evd)) {
84 /* XXX?! Whatever to do, really? */
85 flog(LOG_ERR, "epoll_mod on fd %i: %s", bl->fd, strerror(errno));
86 return(-1);
87 }
88 }
89 bl->n2 = fdlist[bl->fd];
90 bl->p2 = NULL;
91 if(fdlist[bl->fd] != NULL)
92 fdlist[bl->fd]->p2 = bl;
93 fdlist[bl->fd] = bl;
94 bl->reg = 1;
95 return(0);
96}
97
98static void remfd(struct blocker *bl)
99{
100 struct blocker *o;
101 struct epoll_event evd;
102
103 if(!bl->reg)
104 return;
105 if(bl->n2)
106 bl->n2->p2 = bl->p2;
107 if(bl->p2)
108 bl->p2->n2 = bl->n2;
109 if(bl == fdlist[bl->fd])
110 fdlist[bl->fd] = bl->n2;
111 if(fdlist[bl->fd] == NULL) {
112 if(epoll_ctl(epfd, EPOLL_CTL_DEL, bl->fd, NULL))
113 flog(LOG_ERR, "epoll_del on fd %i: %s", bl->fd, strerror(errno));
114 } else {
115 memset(&evd, 0, sizeof(evd));
116 evd.events = 0;
117 evd.data.fd = bl->fd;
118 for(o = fdlist[bl->fd]; o; o = o->n2) {
119 if(o->ev & EV_READ)
120 evd.events |= EPOLLIN;
121 if(o->ev & EV_WRITE)
122 evd.events |= EPOLLOUT;
123 }
124 if(epoll_ctl(epfd, EPOLL_CTL_MOD, bl->fd, &evd)) {
125 /* XXX?! Whatever to do, really? */
126 flog(LOG_ERR, "epoll_mod on fd %i: %s", bl->fd, strerror(errno));
127 }
128 }
9d32586e 129 bl->reg = 0;
a6cda4dd
FT
130}
131
132int block(int fd, int ev, time_t to)
133{
134 struct blocker *bl;
135 int rv;
136
137 omalloc(bl);
138 bl->fd = fd;
139 bl->ev = ev;
140 if(to > 0)
141 bl->to = time(NULL) + to;
142 bl->th = current;
143 if((epfd >= 0) && regfd(bl)) {
144 free(bl);
145 return(-1);
146 }
147 bl->n = blockers;
148 if(blockers)
149 blockers->p = bl;
150 blockers = bl;
151 rv = yield();
152 if(bl->n)
153 bl->n->p = bl->p;
154 if(bl->p)
155 bl->p->n = bl->n;
156 if(bl == blockers)
157 blockers = bl->n;
158 remfd(bl);
159 free(bl);
160 return(rv);
161}
162
9d32586e 163int ioloop(void)
a6cda4dd
FT
164{
165 struct blocker *bl, *nbl;
166 struct epoll_event evr[16];
167 int i, fd, nev, ev, toval;
168 time_t now, timeout;
169
9d32586e 170 exitstatus = 0;
a6cda4dd 171 epfd = epoll_create(128);
be078ac9 172 fcntl(epfd, F_SETFD, FD_CLOEXEC);
a6cda4dd
FT
173 for(bl = blockers; bl; bl = nbl) {
174 nbl = bl->n;
175 if(regfd(bl))
176 resume(bl->th, -1);
177 }
178 while(blockers != NULL) {
179 timeout = 0;
180 for(bl = blockers; bl; bl = bl->n) {
181 if((bl->to != 0) && ((timeout == 0) || (timeout > bl->to)))
182 timeout = bl->to;
183 }
184 now = time(NULL);
185 if(timeout == 0)
186 toval = -1;
187 else if(timeout > now)
188 toval = (timeout - now) * 1000;
189 else
190 toval = 1000;
9d32586e
FT
191 if(exitstatus)
192 break;
a6cda4dd
FT
193 nev = epoll_wait(epfd, evr, sizeof(evr) / sizeof(*evr), toval);
194 if(nev < 0) {
195 if(errno != EINTR) {
f43decce 196 flog(LOG_CRIT, "ioloop: epoll_wait errored out: %s", strerror(errno));
a6cda4dd
FT
197 /* To avoid CPU hogging in case it's bad, which it
198 * probably is. */
199 sleep(1);
200 }
201 continue;
202 }
203 for(i = 0; i < nev; i++) {
204 fd = evr[i].data.fd;
205 ev = 0;
206 if(evr[i].events & EPOLLIN)
207 ev |= EV_READ;
208 if(evr[i].events & EPOLLOUT)
209 ev |= EV_WRITE;
210 if(evr[i].events & ~(EPOLLIN | EPOLLOUT))
211 ev = -1;
212 for(bl = fdlist[fd]; bl; bl = nbl) {
213 nbl = bl->n2;
214 if((ev < 0) || (ev & bl->ev))
215 resume(bl->th, ev);
216 }
217 }
218 now = time(NULL);
219 for(bl = blockers; bl; bl = nbl) {
220 nbl = bl->n;
221 if((bl->to != 0) && (bl->to <= now))
222 resume(bl->th, 0);
223 }
224 }
9d32586e
FT
225 for(bl = blockers; bl; bl = bl->n)
226 remfd(bl);
a6cda4dd
FT
227 close(epfd);
228 epfd = -1;
9d32586e
FT
229 return(exitstatus);
230}
231
232void exitioloop(int status)
233{
234 exitstatus = status;
a6cda4dd 235}