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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 1.15 by pcg, Sun Mar 28 02:07:08 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#if 1 // older unices need these includes for select (2)
27# include <unistd.h>
28# include <sys/types.h>
29#endif
30
31// if the BSDs would at least be marginally POSIX-compatible.. *sigh*
32// until that happens, sys/select.h must come last
24#include <sys/select.h> 33#include <sys/select.h>
25#include <sys/time.h>
26 34
27#include "iom.h" 35#include "iom.h"
28 36
37// TSTAMP_MAX must still fit into a positive struct timeval
38#define TSTAMP_MAX (double)(1UL<<31)
39
40// this is a dummy time watcher to ensure that the first
41// time watcher is _always_ valid, this gets rid of a lot
42// of null-pointer-checks
43// (must come _before_ iom is being defined)
44static struct tw0 : time_watcher
45 {
46 void cb (time_watcher &w)
47 {
48 // should never get called
49 // reached end-of-time, or tstamp has a bogus definition,
50 // or compiler initilization order broken, or somethine else :)
51 abort ();
52 }
53
54 tw0 ()
55 : time_watcher (this, &tw0::cb)
56 { }}
57tw0;
58
29tstamp NOW; 59tstamp NOW;
30bool iom_valid; 60static bool iom_valid;
31io_manager iom; 61io_manager iom;
32 62
63template<class watcher>
64void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue)
65{
66 if (!iom_valid)
67 abort ();
68
69 if (!w->active)
70 {
71#if IOM_CHECK
72 queue.activity = true;
73#endif
74 queue.push_back (w);
75 w->active = queue.size ();
76 }
77}
78
79template<class watcher>
80void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue)
81{
82 if (!iom_valid)
83 return;
84
85 if (w->active)
86 {
87 queue [w->active - 1] = 0;
88 w->active = 0;
89 }
90}
91
92#if IOM_TIME
33void time_watcher::trigger () 93void time_watcher::trigger ()
34{ 94{
35 call (*this); 95 call (*this);
36 96
37 iom.reg (this); 97 iom.reg (this);
38} 98}
39 99
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) 100void 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) 101void io_manager::unreg (time_watcher *w) { unreg (w, tw); }
72{ 102#endif
73 tw.erase (find (tw.begin (), tw.end (), w));
74}
75 103
104#if IOM_IO
105void io_manager::reg (io_watcher *w) { reg (w, iow); }
106void io_manager::unreg (io_watcher *w) { unreg (w, iow); }
107#endif
108
109#if IOM_CHECK
110void io_manager::reg (check_watcher *w) { reg (w, cw); }
111void io_manager::unreg (check_watcher *w) { unreg (w, cw); }
112#endif
113
114#if IOM_IDLE
115void io_manager::reg (idle_watcher *w) { reg (w, iw); }
116void io_manager::unreg (idle_watcher *w) { unreg (w, iw); }
117#endif
118
119#if IOM_TIME
76inline void set_now (void) 120inline void set_now (void)
77{ 121{
78 struct timeval tv; 122 struct timeval tv;
79 123
80 gettimeofday (&tv, 0); 124 gettimeofday (&tv, 0);
81 125
82 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 126 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
127#endif
83} 128}
84 129
85void io_manager::loop () 130void io_manager::loop ()
86{ 131{
132#if IOM_TIME
87 set_now (); 133 set_now ();
134#endif
88 135
89 for (;;) 136 for (;;)
90 { 137 {
91 time_watcher *w; 138 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; 139 struct timeval tval;
112 double diff = w->at - NOW; 140
113 to.tv_sec = (int)diff; 141#if IOM_IDLE
142 if (iw.size ())
143 {
144 tval.tv_sec = 0;
145 tval.tv_usec = 0;
146 to = &tval;
147 }
148 else
149#endif
150
151 {
152#if IOM_TIME
153 time_watcher *next;
154
155 for (;;)
156 {
157 next = tw[0]; // the first time-watcher must exist at ALL times
158
159 for (int i = tw.size (); i--; )
160 if (!tw[i])
161 tw.erase_unordered (i);
162 else if (tw[i]->at < next->at)
163 next = tw[i];
164
165 if (next->at > NOW)
166 {
167 if (next != tw[0])
168 {
169 double diff = next->at - NOW;
170 tval.tv_sec = (int)diff;
114 to.tv_usec = (int)((diff - to.tv_sec) * 1000000); 171 tval.tv_usec = (int) ((diff - tval.tv_sec) * 1000000);
172 to = &tval;
173 }
174 break;
175 }
176 else
177 {
178 unreg (next);
179 next->call (*next);
180 }
181 }
182#endif
115 183
184 }
185
186#if IOM_CHECK
187 tw.activity = false;
188
189 for (int i = cw.size (); i--; )
190 if (!cw[i])
191 cw.erase_unordered (i);
192 else
193 cw[i]->call (*cw[i]);
194
195 if (tw.activity)
196 {
197 tval.tv_sec = 0;
198 tval.tv_usec = 0;
199 to = &tval;
200 }
201#endif
202
203#if IOM_IO
116 fd_set rfd, wfd; 204 fd_set rfd, wfd;
117 205
118 FD_ZERO (&rfd); 206 FD_ZERO (&rfd);
119 FD_ZERO (&wfd); 207 FD_ZERO (&wfd);
120 208
121 int fds = 0; 209 int fds = 0;
122 210
123 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 211 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); )
212 if (*i)
124 { 213 {
125 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 214 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
126 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 215 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
127 216
128 if ((*w)->fd > fds) fds = (*w)->fd; 217 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
129 } 218 }
130 219
220 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
221 break; // no events
222
131 fds = select (fds + 1, &rfd, &wfd, 0, &to); 223 fds = select (fds, &rfd, &wfd, NULL, to);
132 224# if IOM_TIME
133 set_now (); 225 set_now ();
226# endif
134 227
135 if (fds > 0) 228 if (fds > 0)
136 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 229 for (int i = iow.size (); i--; )
230 if (!iow[i])
231 iow.erase_unordered (i);
232 else
137 { 233 {
138 short revents = (*w)->events; 234 short revents = iow[i]->events;
139 235
140 if (!FD_ISSET ((*w)->fd, &rfd)) revents &= ~EVENT_READ; 236 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
141 if (!FD_ISSET ((*w)->fd, &wfd)) revents &= ~EVENT_WRITE; 237 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
142 238
143 if (revents) 239 if (revents)
144 (*w)->call (**w, revents); 240 iow[i]->call (*iow[i], revents);
145 } 241 }
146 } 242 else if (fds < 0 && errno != EINTR)
147} 243 {
244 perror ("Error while waiting for I/O or time event");
245 abort ();
246 }
247#if IOM_IDLE
248 else
249 for (int i = iw.size (); i--; )
250 if (!iw[i])
251 iw.erase_unordered (i);
252 else
253 iw[i]->call (*iw[i]);
254#endif
148 255
149void io_manager::idle_cb (time_watcher &w) 256#elif IOM_TIME
150{ 257 if (!to)
151 w.at = NOW + 1000000000; 258 break;
259
260 select (0, 0, 0, 0, &to);
261 set_now ();
262#else
263 break;
264#endif
265
266 }
152} 267}
153 268
154io_manager::io_manager () 269io_manager::io_manager ()
155{ 270{
271 iom_valid = true;
272
273#if IOM_TIME
156 set_now (); 274 set_now ();
157 275
158 iom_valid = true; 276 tw0.start (TSTAMP_MAX);
159 277#endif
160 idle = new time_watcher (this, &io_manager::idle_cb);
161 idle->start (0);
162} 278}
163 279
164io_manager::~io_manager () 280io_manager::~io_manager ()
165{ 281{
166 iom_valid = false; 282 iom_valid = false;

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