ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/rxvt-unicode/src/iom.C
(Generate patch)

Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.5 by pcg, Sat Nov 29 18:42:07 2003 UTC vs.
Revision 1.17 by root, Tue Aug 10 20:39:19 2004 UTC

1/* 1/*
2 iom.C -- generic I/O multiplexor 2 iom.C -- generic I/O multiplexor
3 Copyright (C) 2003 Marc Lehmann <pcg@goof.com> 3 Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com>
4 4
5 This program is free software; you can redistribute it and/or modify 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 6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or 7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version. 8 (at your option) any later version.
… …
15 You should have received a copy of the GNU General Public License 15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software 16 along with this program; if not, write to the Free Software
17 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18*/ 18*/
19 19
20#include "../config.h"
21
22#include <cstdio> 20#include <cstdio>
21#include <cstdlib>
22#include <cerrno>
23 23
24#include <sys/time.h>
25
26#include <assert.h>
27
28#if 1 // older unices need these includes for select (2)
29# include <unistd.h>
30# include <sys/types.h>
31#endif
32
33// if the BSDs would at least be marginally POSIX-compatible.. *sigh*
34// until that happens, sys/select.h must come last
24#include <sys/select.h> 35#include <sys/select.h>
36
37// for IOM_SIG
25#include <sys/time.h> 38#include <signal.h>
26 39
27#include "iom.h" 40#include "iom.h"
28 41
42// TSTAMP_MAX must still fit into a positive struct timeval
43#define TSTAMP_MAX (double)(1UL<<31)
44
45// this is a dummy time watcher to ensure that the first
46// time watcher is _always_ valid, this gets rid of a lot
47// of null-pointer-checks
48// (must come _before_ iom is being defined)
49static struct tw0 : time_watcher
50 {
51 void cb (time_watcher &w)
52 {
53 // should never get called
54 // reached end-of-time, or tstamp has a bogus definition,
55 // or compiler initialisation order broken, or something else :)
56 abort ();
57 }
58
59 tw0 ()
60 : time_watcher (this, &tw0::cb)
61 { }
62 } tw0;
63
29tstamp NOW; 64tstamp NOW;
30bool iom_valid; 65static bool iom_valid;
31io_manager iom; 66io_manager iom;
32 67
33template<class watcher> 68template<class watcher>
34void io_manager::reg (watcher *w, simplevec<watcher *> &queue) 69void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue)
35{ 70{
36 if (find (queue.begin (), queue.end (), w) == queue.end ()) 71 if (!iom_valid)
72 abort ();
73
74 if (!w->active)
75 {
76#if IOM_CHECK
77 queue.activity = true;
78#endif
37 queue.push_back (w); 79 queue.push_back (w);
80 w->active = queue.size ();
81 }
38} 82}
39 83
40template<class watcher> 84template<class watcher>
41void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) 85void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue)
42{ 86{
43 queue.erase (find (queue.begin (), queue.end (), w)); 87 if (!iom_valid)
88 return;
89
90 if (w->active)
91 {
92 queue [w->active - 1] = 0;
93 w->active = 0;
94 }
44} 95}
96
97#if IOM_TIME
98void time_watcher::trigger ()
99{
100 call (*this);
101
102 iom.reg (this);
103}
104
105void io_manager::reg (time_watcher *w) { reg (w, tw); }
106void io_manager::unreg (time_watcher *w) { unreg (w, tw); }
107#endif
45 108
46#if IOM_IO 109#if IOM_IO
47io_watcher::~io_watcher () 110void io_manager::reg (io_watcher *w) { reg (w, iow); }
48{ 111void io_manager::unreg (io_watcher *w) { unreg (w, iow); }
49 if (iom_valid) 112#endif
50 iom.unreg (this);
51}
52 113
114#if IOM_CHECK
115void io_manager::reg (check_watcher *w) { reg (w, cw); }
116void io_manager::unreg (check_watcher *w) { unreg (w, cw); }
117#endif
118
119#if IOM_IDLE
120void io_manager::reg (idle_watcher *w) { reg (w, iw); }
121void io_manager::unreg (idle_watcher *w) { unreg (w, iw); }
122#endif
123
124#if IOM_TIME
125inline void set_now (void)
126{
127 struct timeval tv;
128
129 gettimeofday (&tv, 0);
130
131 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
132}
133#endif
134
135#if IOM_SIG
136// race conditions galore
137
138void io_manager::sighandler (int signum)
139{
140 assert (0 < signum && signum <= iom.sw.size ());
141
142 sig_vec &sv = *iom.sw [signum - 1];
143
144 for (int i = sv.size (); i--; )
145 if (!sv[i])
146 sv.erase_unordered (i);
147 else
148 sv[i]->call (*sv[i]);
149}
150
53void io_manager::reg (io_watcher *w) 151void io_manager::reg (sig_watcher *w)
54{ 152{
153 assert (0 < w->signum);
154
155 sw.reserve (w->signum);
156
157 sig_vec *&sv = sw [w->signum - 1];
158
159 if (!sv)
160 {
161 sv = new sig_vec;
162
163 struct sigaction sa;
164 sa.sa_handler = io_manager::sighandler;
165 sigfillset (&sa.sa_mask);
166 sa.sa_flags = 0;
167
168 if (sigaction (w->signum, &sa, 0))
169 {
170 perror ("Error while installing signal handler");
171 abort ();
172 }
173 }
174
55 reg (w, iow); 175 reg (w, *sv);
56} 176}
57 177
58void io_manager::unreg (io_watcher *w) 178void io_manager::unreg (sig_watcher *w)
59{ 179{
60 unreg (w, iow); 180 assert (0 < w->signum && w->signum <= sw.size ());
181
182 unreg (w, *sw [w->signum - 1]);
61} 183}
62 184
63#endif 185void sig_watcher::start (int signum)
64
65#if IOM_TIME
66void time_watcher::trigger ()
67{ 186{
68 call (*this); 187 stop ();
69 188 this->signum = signum;
70 iom.reg (this); 189 iom.reg (this);
71} 190}
72
73time_watcher::~time_watcher ()
74{
75 if (iom_valid)
76 iom.unreg (this);
77
78 at = TSTAMP_CANCEL;
79}
80
81void io_manager::reg (time_watcher *w)
82{
83 reg (w, tw);
84}
85
86void io_manager::unreg (time_watcher *w)
87{
88 unreg (w, tw);
89}
90#endif 191#endif
192
193void io_manager::loop ()
194{
195#if IOM_TIME
196 set_now ();
197#endif
198
199 for (;;)
200 {
201 struct timeval *to = 0;
202 struct timeval tval;
203
204#if IOM_IDLE
205 if (iw.size ())
206 {
207 tval.tv_sec = 0;
208 tval.tv_usec = 0;
209 to = &tval;
210 }
211 else
212#endif
213
214 {
215#if IOM_TIME
216 time_watcher *next;
217
218 for (;;)
219 {
220 next = tw[0]; // the first time-watcher must exist at ALL times
221
222 for (int i = tw.size (); i--; )
223 if (!tw[i])
224 tw.erase_unordered (i);
225 else if (tw[i]->at < next->at)
226 next = tw[i];
227
228 if (next->at > NOW)
229 {
230 if (next != tw[0])
231 {
232 double diff = next->at - NOW;
233 tval.tv_sec = (int)diff;
234 tval.tv_usec = (int) ((diff - tval.tv_sec) * 1000000);
235 to = &tval;
236 }
237 break;
238 }
239 else
240 {
241 unreg (next);
242 next->call (*next);
243 }
244 }
245#endif
246
247 }
91 248
92#if IOM_CHECK 249#if IOM_CHECK
93check_watcher::~check_watcher () 250 tw.activity = false;
94{
95 if (iom_valid)
96 iom.unreg (this);
97}
98 251
99void io_manager::reg (check_watcher *w)
100{
101 reg (w, cw);
102}
103
104void io_manager::unreg (check_watcher *w)
105{
106 unreg (w, cw);
107}
108#endif
109
110#if IOM_TIME
111inline void set_now (void)
112{
113 struct timeval tv;
114
115 gettimeofday (&tv, 0);
116
117 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
118#endif
119}
120
121void io_manager::loop ()
122{
123#if IOM_TIME
124 set_now ();
125#endif
126
127 for (;;)
128 {
129#if IOM_CHECK
130 for (int i = 0; i < cw.size (); ++i) 252 for (int i = cw.size (); i--; )
253 if (!cw[i])
254 cw.erase_unordered (i);
255 else
131 cw[i]->call (*cw[i]); 256 cw[i]->call (*cw[i]);
132#endif
133 257
134 struct timeval *to = 0; 258 if (tw.activity)
135
136#if IOM_TIME
137 struct timeval tval;
138 time_watcher *w;
139
140 for (;tw.size ();)
141 {
142 w = tw[0];
143
144 for (time_watcher **i = tw.begin (); i < tw.end (); ++i)
145 if ((*i)->at < w->at)
146 w = *i;
147
148 if (w->at > NOW)
149 { 259 {
150 double diff = w->at - NOW;
151 tval.tv_sec = (int)diff; 260 tval.tv_sec = 0;
152 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); 261 tval.tv_usec = 0;
153 to = &tval; 262 to = &tval;
154 break;
155 }
156 else if (w->at >= 0)
157 w->call (*w);
158 else
159 unreg (w);
160 } 263 }
161#endif 264#endif
162 265
163#if IOM_IO 266#if IOM_IO
164 fd_set rfd, wfd; 267 fd_set rfd, wfd;
… …
166 FD_ZERO (&rfd); 269 FD_ZERO (&rfd);
167 FD_ZERO (&wfd); 270 FD_ZERO (&wfd);
168 271
169 int fds = 0; 272 int fds = 0;
170 273
171 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 274 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); )
275 if (*i)
172 { 276 {
173 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 277 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
174 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 278 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
175 279
176 if ((*w)->fd >= fds) fds = (*w)->fd + 1; 280 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
177 } 281 }
178 282
179 if (!to && !fds) 283 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
180 break; // no events 284 break; // no events
181 285
182 fds = select (fds, &rfd, &wfd, 0, to); 286 fds = select (fds, &rfd, &wfd, NULL, to);
183# if IOM_TIME 287# if IOM_TIME
184 set_now (); 288 set_now ();
185# endif 289# endif
186 290
187 if (fds > 0) 291 if (fds > 0)
188 for (int i = 0; i < iow.size (); ++i) 292 for (int i = iow.size (); i--; )
293 if (!iow[i])
294 iow.erase_unordered (i);
295 else
189 { 296 {
190 io_watcher *w = iow[i];
191
192 short revents = w->events; 297 short revents = iow[i]->events;
193 298
194 if (!FD_ISSET (w->fd, &rfd)) revents &= ~EVENT_READ; 299 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
195 if (!FD_ISSET (w->fd, &wfd)) revents &= ~EVENT_WRITE; 300 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
196 301
197 if (revents) 302 if (revents)
198 w->call (*w, revents); 303 iow[i]->call (*iow[i], revents);
199 } 304 }
305 else if (fds < 0 && errno != EINTR)
306 {
307 perror ("Error while waiting for I/O or time event");
308 abort ();
309 }
310#if IOM_IDLE
311 else
312 for (int i = iw.size (); i--; )
313 if (!iw[i])
314 iw.erase_unordered (i);
315 else
316 iw[i]->call (*iw[i]);
317#endif
318
200#elif IOM_TIME 319#elif IOM_TIME
201 if (!to) 320 if (!to)
202 break; 321 break;
203 322
204 select (0, 0, 0, 0, &to); 323 select (0, 0, 0, 0, &to);
205 set_now (); 324 set_now ();
206#else 325#else
207 break; 326 break;
208#endif 327#endif
328
209 } 329 }
210} 330}
211 331
212io_manager::io_manager () 332io_manager::io_manager ()
213{ 333{
334 iom_valid = true;
335
214#if IOM_TIME 336#if IOM_TIME
215 set_now (); 337 set_now ();
216#endif
217 338
218 iom_valid = true; 339 tw0.start (TSTAMP_MAX);
340#endif
219} 341}
220 342
221io_manager::~io_manager () 343io_manager::~io_manager ()
222{ 344{
223 iom_valid = false; 345 iom_valid = false;

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines