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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.4 by pcg, Wed Nov 26 10:42:34 2003 UTC vs.
Revision 1.10 by pcg, Sat Jan 17 14:10:40 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/select.h> 24#include <sys/select.h>
25#include <sys/time.h> 25#include <sys/time.h>
26 26
27#include "iom.h" 27#include "iom.h"
28 28
29// TSTAMP_MAX must still fit into a positive struct timeval
30#define TSTAMP_MAX (double)(1UL<<31)
31
32// this is a dummy time watcher to ensure that the first
33// time watcher is _always_ valid, this gets rid of a lot
34// of null-pointer-checks
35// (must come _before_ iom is being defined)
36static struct tw0 : time_watcher {
37 void cb (time_watcher &w)
38 {
39 // should never get called
40 // reached end-of-time, or tstamp has a bogus definition,
41 // or compiler initilization order broken, or somethine else :)
42 abort ();
43 }
44
45 tw0()
46 : time_watcher (this, &tw0::cb)
47 { }
48} tw0;
49
29tstamp NOW; 50tstamp NOW;
30bool iom_valid; 51static bool iom_valid;
31io_manager iom; 52io_manager iom;
32 53
33template<class watcher> 54template<class watcher>
34void io_manager::reg (watcher *w, simplevec<watcher *> &queue) 55void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue)
35{ 56{
36 if (find (queue.begin (), queue.end (), w) == queue.end ()) 57 if (!iom_valid)
58 abort ();
59
60 if (!w->active)
61 {
37 queue.push_back (w); 62 queue.push_back (w);
63 w->active = queue.size ();
64 }
38} 65}
39 66
40template<class watcher> 67template<class watcher>
41void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) 68void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue)
42{ 69{
43 queue.erase (find (queue.begin (), queue.end (), w)); 70 if (!iom_valid)
71 return;
72
73 if (w->active)
74 {
75 queue [w->active - 1] = 0;
76 w->active = 0;
77 }
44} 78}
79
80#if IOM_TIME
81void time_watcher::trigger ()
82{
83 call (*this);
84
85 iom.reg (this);
86}
87
88void io_manager::reg (time_watcher *w) { reg (w, tw); }
89void io_manager::unreg (time_watcher *w) { unreg (w, tw); }
90#endif
45 91
46#if IOM_IO 92#if IOM_IO
47io_watcher::~io_watcher ()
48{
49 if (iom_valid)
50 iom.unreg (this);
51}
52
53void io_manager::reg (io_watcher *w) 93void io_manager::reg (io_watcher *w) { reg (w, iow); }
54{
55 reg (w, iow);
56}
57
58void io_manager::unreg (io_watcher *w) 94void io_manager::unreg (io_watcher *w) { unreg (w, iow); }
59{
60 unreg (w, iow);
61}
62
63#endif
64
65#if IOM_TIME
66void time_watcher::trigger ()
67{
68 call (*this);
69
70 iom.reg (this);
71}
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 95#endif
91 96
92#if IOM_CHECK 97#if IOM_CHECK
93check_watcher::~check_watcher ()
94{
95 if (iom_valid)
96 iom.unreg (this);
97}
98
99void io_manager::reg (check_watcher *w) 98void io_manager::reg (check_watcher *w) { reg (w, cw); }
100{
101 reg (w, cw);
102}
103
104void io_manager::unreg (check_watcher *w) 99void io_manager::unreg (check_watcher *w) { unreg (w, cw); }
105{ 100#endif
106 unreg (w, cw); 101
107} 102#if IOM_IDLE
103void io_manager::reg (idle_watcher *w) { reg (w, iw); }
104void io_manager::unreg (idle_watcher *w) { unreg (w, iw); }
108#endif 105#endif
109 106
110#if IOM_TIME 107#if IOM_TIME
111inline void set_now (void) 108inline void set_now (void)
112{ 109{
… …
124 set_now (); 121 set_now ();
125#endif 122#endif
126 123
127 for (;;) 124 for (;;)
128 { 125 {
126 struct timeval *to = 0;
127 struct timeval tval;
128
129#if IOM_IDLE
130 if (iw.size ())
131 {
132 tval.tv_sec = 0;
133 tval.tv_usec = 0;
134 to = &tval;
135 }
136 else
137#endif
138 {
139#if IOM_TIME
140 time_watcher *next;
141
142 for (;;)
143 {
144 next = tw[0]; // the first time-watcher must exist at ALL times
145
146 for (int i = tw.size (); i--; )
147 if (!tw[i])
148 tw.erase_unordered (i);
149 else if (tw[i]->at < next->at)
150 next = tw[i];
151
152 if (next->at > NOW)
153 {
154 if (next != tw[0])
155 {
156 double diff = next->at - NOW;
157 tval.tv_sec = (int)diff;
158 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000);
159 to = &tval;
160 }
161 break;
162 }
163 else
164 {
165 unreg (next);
166 next->call (*next);
167 }
168 }
169#endif
170 }
171
129#if IOM_CHECK 172#if IOM_CHECK
130 for (int i = 0; i < cw.size (); ++i) 173 for (int i = cw.size (); i--; )
174 if (!cw[i])
175 cw.erase_unordered (i);
176 else
131 cw[i]->call (*cw[i]); 177 cw[i]->call (*cw[i]);
132#endif
133
134#if IOM_TIME
135 time_watcher *w;
136
137 for (;;)
138 {
139 w = tw[0];
140
141 for (time_watcher **i = tw.begin (); i < tw.end (); ++i)
142 if ((*i)->at < w->at)
143 w = *i;
144
145 if (w->at > NOW)
146 break;
147
148 // call it
149 w->call (*w);
150
151 if (w->at < 0)
152 unreg (w);
153 }
154
155 double diff = w->at - NOW;
156 struct timeval to;
157 to.tv_sec = (int)diff;
158 to.tv_usec = (int)((diff - to.tv_sec) * 1000000);
159#endif 178#endif
160 179
161#if IOM_IO 180#if IOM_IO
162 fd_set rfd, wfd; 181 fd_set rfd, wfd, efd;
163 182
164 FD_ZERO (&rfd); 183 FD_ZERO (&rfd);
165 FD_ZERO (&wfd); 184 FD_ZERO (&wfd);
166 185
167 int fds = 0; 186 int fds = 0;
168 187
169 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 188 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); )
189 if (*i)
190 {
191 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
192 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
193
194 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
195 }
196
197 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
198 break; // no events
199
200 fds = select (fds, &rfd, &wfd, &efd, to);
201# if IOM_TIME
202 set_now ();
203# endif
204
205 if (fds > 0)
206 for (int i = iow.size (); i--; )
207 if (!iow[i])
208 iow.erase_unordered (i);
209 else
210 {
211 short revents = iow[i]->events;
212
213 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
214 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
215
216 if (revents)
217 iow[i]->call (*iow[i], revents);
218 }
219 else if (fds < 0 && errno != EINTR)
170 { 220 {
171 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 221 perror ("Error while waiting for I/O or time event");
172 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 222 abort ();
173
174 if ((*w)->fd > fds) fds = (*w)->fd;
175 } 223 }
176
177# if IOM_TIME 224#if IOM_IDLE
178 fds = select (fds + 1, &rfd, &wfd, 0, &to); 225 else
179 set_now (); 226 for (int i = iw.size (); i--; )
180# else 227 if (!iw[i])
181 fds = select (fds + 1, &rfd, &wfd, 0, 0); 228 iw.erase_unordered (i);
229 else
230 iw[i]->call (*iw[i]);
182# endif 231#endif
183 232
184 if (fds > 0)
185 for (int i = 0; i < iow.size (); ++i)
186 {
187 io_watcher *w = iow[i];
188
189 short revents = w->events;
190
191 if (!FD_ISSET (w->fd, &rfd)) revents &= ~EVENT_READ;
192 if (!FD_ISSET (w->fd, &wfd)) revents &= ~EVENT_WRITE;
193
194 if (revents)
195 w->call (*w, revents);
196 }
197 }
198#elif IOM_TIME 233#elif IOM_TIME
234 if (!to)
235 break;
236
199 select (0, 0, 0, 0, &to); 237 select (0, 0, 0, 0, &to);
200 set_now (); 238 set_now ();
239#else
240 break;
201#endif 241#endif
202} 242 }
203
204void io_manager::idle_cb (time_watcher &w)
205{
206 w.at = NOW + 1000000000;
207} 243}
208 244
209io_manager::io_manager () 245io_manager::io_manager ()
210{ 246{
247 iom_valid = true;
248
249#if IOM_TIME
211 set_now (); 250 set_now ();
212 251
213 iom_valid = true; 252 tw0.start (TSTAMP_MAX);
214 253 printf ("abort, %f but inly on %f\n", NOW, tw0.at);
215#if IOM_TIME
216 idle = new time_watcher (this, &io_manager::idle_cb);
217 idle->start (0);
218#endif 254#endif
219} 255}
220 256
221io_manager::~io_manager () 257io_manager::~io_manager ()
222{ 258{

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