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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.3 by pcg, Tue Nov 25 17:11:33 2003 UTC vs.
Revision 1.16 by pcg, Fri Apr 2 14:30:06 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 initilization order broken, or somethine 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
68template<class watcher>
69void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue)
70{
71 if (!iom_valid)
72 abort ();
73
74 if (!w->active)
75 {
76#if IOM_CHECK
77 queue.activity = true;
78#endif
79 queue.push_back (w);
80 w->active = queue.size ();
81 }
82}
83
84template<class watcher>
85void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue)
86{
87 if (!iom_valid)
88 return;
89
90 if (w->active)
91 {
92 queue [w->active - 1] = 0;
93 w->active = 0;
94 }
95}
96
97#if IOM_TIME
33void time_watcher::trigger () 98void time_watcher::trigger ()
34{ 99{
35 call (*this); 100 call (*this);
36 101
37 iom.reg (this); 102 iom.reg (this);
38} 103}
39 104
40time_watcher::~time_watcher ()
41{
42 if (iom_valid)
43 iom.unreg (this);
44
45 at = TSTAMP_CANCEL;
46}
47
48io_watcher::~io_watcher ()
49{
50 if (iom_valid)
51 iom.unreg (this);
52}
53
54void io_manager::reg (io_watcher *w)
55{
56 if (find (iow.begin (), iow.end (), w) == iow.end ())
57 iow.push_back (w);
58}
59
60void io_manager::unreg (io_watcher *w)
61{
62 iow.erase (find (iow.begin (), iow.end (), w));
63}
64
65void io_manager::reg (time_watcher *w) 105void io_manager::reg (time_watcher *w) { reg (w, tw); }
66{
67 if (find (tw.begin (), tw.end (), w) == tw.end ())
68 tw.push_back (w);
69}
70
71void io_manager::unreg (time_watcher *w) 106void io_manager::unreg (time_watcher *w) { unreg (w, tw); }
72{ 107#endif
73 tw.erase (find (tw.begin (), tw.end (), w));
74}
75 108
109#if IOM_IO
110void io_manager::reg (io_watcher *w) { reg (w, iow); }
111void io_manager::unreg (io_watcher *w) { unreg (w, iow); }
112#endif
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
76inline void set_now (void) 125inline void set_now (void)
77{ 126{
78 struct timeval tv; 127 struct timeval tv;
79 128
80 gettimeofday (&tv, 0); 129 gettimeofday (&tv, 0);
81 130
82 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 131 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
83} 132}
133#endif
84 134
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
151void io_manager::reg (sig_watcher *w)
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
175 reg (w, *sv);
176}
177
178void io_manager::unreg (sig_watcher *w)
179{
180 assert (0 < w->signum && w->signum <= sw.size ());
181
182 unreg (w, *sw [w->signum - 1]);
183}
184
185void sig_watcher::start (int signum)
186{
187 stop ();
188 this->signum = signum;
189 iom.reg (this);
190}
191#endif
192
85void io_manager::loop () 193void io_manager::loop ()
86{ 194{
195#if IOM_TIME
87 set_now (); 196 set_now ();
197#endif
88 198
89 for (;;) 199 for (;;)
90 { 200 {
91 time_watcher *w; 201 struct timeval *to = 0;
92
93 for (;;)
94 {
95 w = tw[0];
96
97 for (time_watcher **i = tw.begin (); i != tw.end (); ++i)
98 if ((*i)->at < w->at)
99 w = *i;
100
101 if (w->at > NOW)
102 break;
103
104 // call it
105 w->call (*w);
106
107 if (w->at < 0)
108 unreg (w);
109 }
110
111 struct timeval to; 202 struct timeval tval;
112 double diff = w->at - NOW; 203
113 to.tv_sec = (int)diff; 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;
114 to.tv_usec = (int)((diff - to.tv_sec) * 1000000); 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
115 246
247 }
248
249#if IOM_CHECK
250 tw.activity = false;
251
252 for (int i = cw.size (); i--; )
253 if (!cw[i])
254 cw.erase_unordered (i);
255 else
256 cw[i]->call (*cw[i]);
257
258 if (tw.activity)
259 {
260 tval.tv_sec = 0;
261 tval.tv_usec = 0;
262 to = &tval;
263 }
264#endif
265
266#if IOM_IO
116 fd_set rfd, wfd; 267 fd_set rfd, wfd;
117 268
118 FD_ZERO (&rfd); 269 FD_ZERO (&rfd);
119 FD_ZERO (&wfd); 270 FD_ZERO (&wfd);
120 271
121 int fds = 0; 272 int fds = 0;
122 273
123 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)
124 { 276 {
125 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 277 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
126 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 278 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
127 279
128 if ((*w)->fd > fds) fds = (*w)->fd; 280 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
129 } 281 }
130 282
283 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
284 break; // no events
285
131 fds = select (fds + 1, &rfd, &wfd, 0, &to); 286 fds = select (fds, &rfd, &wfd, NULL, to);
132 287# if IOM_TIME
133 set_now (); 288 set_now ();
289# endif
134 290
135 if (fds > 0) 291 if (fds > 0)
136 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 292 for (int i = iow.size (); i--; )
293 if (!iow[i])
294 iow.erase_unordered (i);
295 else
137 { 296 {
138 short revents = (*w)->events; 297 short revents = iow[i]->events;
139 298
140 if (!FD_ISSET ((*w)->fd, &rfd)) revents &= ~EVENT_READ; 299 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
141 if (!FD_ISSET ((*w)->fd, &wfd)) revents &= ~EVENT_WRITE; 300 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
142 301
143 if (revents) 302 if (revents)
144 (*w)->call (**w, revents); 303 iow[i]->call (*iow[i], revents);
145 } 304 }
146 } 305 else if (fds < 0 && errno != EINTR)
147} 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
148 318
149void io_manager::idle_cb (time_watcher &w) 319#elif IOM_TIME
150{ 320 if (!to)
151 w.at = NOW + 1000000000; 321 break;
322
323 select (0, 0, 0, 0, &to);
324 set_now ();
325#else
326 break;
327#endif
328
329 }
152} 330}
153 331
154io_manager::io_manager () 332io_manager::io_manager ()
155{ 333{
334 iom_valid = true;
335
336#if IOM_TIME
156 set_now (); 337 set_now ();
157 338
158 iom_valid = true; 339 tw0.start (TSTAMP_MAX);
159 340#endif
160 idle = new time_watcher (this, &io_manager::idle_cb);
161 idle->start (0);
162} 341}
163 342
164io_manager::~io_manager () 343io_manager::~io_manager ()
165{ 344{
166 iom_valid = false; 345 iom_valid = false;

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