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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.1 by pcg, Mon Nov 24 17:28:08 2003 UTC vs.
Revision 1.12 by pcg, Thu Jan 29 23:26:01 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 void cb (time_watcher &w)
46 {
47 // should never get called
48 // reached end-of-time, or tstamp has a bogus definition,
49 // or compiler initilization order broken, or somethine else :)
50 abort ();
51 }
52
53 tw0()
54 : time_watcher (this, &tw0::cb)
55 { }
56} tw0;
57
29tstamp NOW; 58tstamp NOW;
30bool iom_valid; 59static bool iom_valid;
31io_manager iom; 60io_manager iom;
32 61
62template<class watcher>
63void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue)
64{
65 if (!iom_valid)
66 abort ();
67
68 if (!w->active)
69 {
70#if IOM_CHECK
71 queue.activity = true;
72#endif
73 queue.push_back (w);
74 w->active = queue.size ();
75 }
76}
77
78template<class watcher>
79void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue)
80{
81 if (!iom_valid)
82 return;
83
84 if (w->active)
85 {
86 queue [w->active - 1] = 0;
87 w->active = 0;
88 }
89}
90
91#if IOM_TIME
33void time_watcher::trigger () 92void time_watcher::trigger ()
34{ 93{
35 call (*this); 94 call (*this);
36 95
37 iom.reg (this); 96 iom.reg (this);
38} 97}
39 98
40time_watcher::~time_watcher ()
41{
42 if (iom_valid)
43 iom.unreg (this);
44}
45
46io_watcher::~io_watcher ()
47{
48 if (iom_valid)
49 iom.unreg (this);
50}
51
52void io_manager::reg (io_watcher *w)
53{
54 if (find (iow.begin (), iow.end (), w) == iow.end ())
55 iow.push_back (w);
56}
57
58void io_manager::unreg (io_watcher *w)
59{
60 iow.erase (find (iow.begin (), iow.end (), w));
61}
62
63void io_manager::reg (time_watcher *w) 99void io_manager::reg (time_watcher *w) { reg (w, tw); }
64{
65 if (find (tw.begin (), tw.end (), w) == tw.end ())
66 tw.push_back (w);
67}
68
69void io_manager::unreg (time_watcher *w) 100void io_manager::unreg (time_watcher *w) { unreg (w, tw); }
70{ 101#endif
71 tw.erase (find (tw.begin (), tw.end (), w));
72}
73 102
103#if IOM_IO
104void io_manager::reg (io_watcher *w) { reg (w, iow); }
105void io_manager::unreg (io_watcher *w) { unreg (w, iow); }
106#endif
107
108#if IOM_CHECK
109void io_manager::reg (check_watcher *w) { reg (w, cw); }
110void io_manager::unreg (check_watcher *w) { unreg (w, cw); }
111#endif
112
113#if IOM_IDLE
114void io_manager::reg (idle_watcher *w) { reg (w, iw); }
115void io_manager::unreg (idle_watcher *w) { unreg (w, iw); }
116#endif
117
118#if IOM_TIME
74inline void set_now (void) 119inline void set_now (void)
75{ 120{
76 struct timeval tv; 121 struct timeval tv;
77 122
78 gettimeofday (&tv, 0); 123 gettimeofday (&tv, 0);
79 124
80 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 125 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
126#endif
81} 127}
82 128
83void io_manager::loop () 129void io_manager::loop ()
84{ 130{
131#if IOM_TIME
85 set_now (); 132 set_now ();
133#endif
86 134
87 for (;;) 135 for (;;)
88 { 136 {
89 time_watcher *w; 137 struct timeval *to = 0;
90
91 for (;;)
92 {
93 w = tw[0];
94
95 for (time_watcher **i = tw.begin (); i != tw.end (); ++i)
96 if ((*i)->at < w->at)
97 w = *i;
98
99 if (w->at > NOW)
100 break;
101
102 // call it
103 w->call (*w);
104
105 // re-add it if necessary
106 if (w->at >= 0)
107 reg (w);
108 }
109
110 struct timeval to; 138 struct timeval tval;
111 double diff = w->at - NOW; 139
112 to.tv_sec = (int)diff; 140#if IOM_IDLE
141 if (iw.size ())
142 {
143 tval.tv_sec = 0;
144 tval.tv_usec = 0;
145 to = &tval;
146 }
147 else
148#endif
149 {
150#if IOM_TIME
151 time_watcher *next;
152
153 for (;;)
154 {
155 next = tw[0]; // the first time-watcher must exist at ALL times
156
157 for (int i = tw.size (); i--; )
158 if (!tw[i])
159 tw.erase_unordered (i);
160 else if (tw[i]->at < next->at)
161 next = tw[i];
162
163 if (next->at > NOW)
164 {
165 if (next != tw[0])
166 {
167 double diff = next->at - NOW;
168 tval.tv_sec = (int)diff;
113 to.tv_usec = (int)((diff - to.tv_sec) * 1000000); 169 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000);
170 to = &tval;
171 }
172 break;
173 }
174 else
175 {
176 unreg (next);
177 next->call (*next);
178 }
179 }
180#endif
181 }
114 182
183#if IOM_CHECK
184 tw.activity = false;
185
186 for (int i = cw.size (); i--; )
187 if (!cw[i])
188 cw.erase_unordered (i);
189 else
190 cw[i]->call (*cw[i]);
191
192 if (tw.activity)
193 {
194 tval.tv_sec = 0;
195 tval.tv_usec = 0;
196 to = &tval;
197 }
198#endif
199
200#if IOM_IO
115 fd_set rfd, wfd; 201 fd_set rfd, wfd, efd;
116 202
117 FD_ZERO (&rfd); 203 FD_ZERO (&rfd);
118 FD_ZERO (&wfd); 204 FD_ZERO (&wfd);
119 205
120 int fds = 0; 206 int fds = 0;
121 207
122 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 208 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); )
209 if (*i)
123 { 210 {
124 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 211 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
125 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 212 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
126 213
127 if ((*w)->fd > fds) fds = (*w)->fd; 214 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
128 } 215 }
129 216
217 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
218 break; // no events
219
130 fds = select (fds + 1, &rfd, &wfd, 0, &to); 220 fds = select (fds, &rfd, &wfd, &efd, to);
131 221# if IOM_TIME
132 set_now (); 222 set_now ();
223# endif
133 224
134 if (fds > 0) 225 if (fds > 0)
135 for (io_watcher **w = iow.begin (); w < iow.end (); w++) 226 for (int i = iow.size (); i--; )
227 if (!iow[i])
228 iow.erase_unordered (i);
229 else
136 { 230 {
137 short revents = (*w)->events; 231 short revents = iow[i]->events;
138 232
139 if (!FD_ISSET ((*w)->fd, &rfd)) revents &= ~EVENT_READ; 233 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
140 if (!FD_ISSET ((*w)->fd, &wfd)) revents &= ~EVENT_WRITE; 234 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
141 235
142 if (revents) 236 if (revents)
143 (*w)->call (**w, revents); 237 iow[i]->call (*iow[i], revents);
144 } 238 }
239 else if (fds < 0 && errno != EINTR)
240 {
241 perror ("Error while waiting for I/O or time event");
242 abort ();
243 }
244#if IOM_IDLE
245 else
246 for (int i = iw.size (); i--; )
247 if (!iw[i])
248 iw.erase_unordered (i);
249 else
250 iw[i]->call (*iw[i]);
251#endif
252
253#elif IOM_TIME
254 if (!to)
255 break;
256
257 select (0, 0, 0, 0, &to);
258 set_now ();
259#else
260 break;
261#endif
145 } 262 }
146} 263}
147 264
148void io_manager::idle_cb (time_watcher &w)
149{
150 w.at = NOW + 1000000000;
151}
152
153io_manager::io_manager () 265io_manager::io_manager ()
154{ 266{
267 iom_valid = true;
268
269#if IOM_TIME
155 set_now (); 270 set_now ();
156 271
157 iom_valid = true; 272 tw0.start (TSTAMP_MAX);
158 273#endif
159 idle = new time_watcher (this, &io_manager::idle_cb);
160 idle->start (0);
161} 274}
162 275
163io_manager::~io_manager () 276io_manager::~io_manager ()
164{ 277{
165 iom_valid = false; 278 iom_valid = false;

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