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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 1.9 by pcg, Sat Jan 17 01:20:01 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/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
29tstamp NOW; 32tstamp NOW;
30bool iom_valid; 33static bool iom_valid;
31io_manager iom; 34io_manager iom;
32 35
33template<class watcher> 36template<class watcher>
34void io_manager::reg (watcher *w, simplevec<watcher *> &queue) 37void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue)
35{ 38{
36 if (find (queue.begin (), queue.end (), w) == queue.end ()) 39 if (!iom_valid)
40 abort ();
41
42 if (!w->active)
43 {
37 queue.push_back (w); 44 queue.push_back (w);
45 w->active = queue.size ();
46 }
38} 47}
39 48
40template<class watcher> 49template<class watcher>
41void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) 50void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue)
42{ 51{
43 queue.erase (find (queue.begin (), queue.end (), w)); 52 if (!iom_valid)
53 return;
54
55 if (w->active)
56 {
57 queue [w->active - 1] = 0;
58 w->active = 0;
59 }
44} 60}
61
62#if IOM_TIME
63void time_watcher::trigger ()
64{
65 call (*this);
66
67 iom.reg (this);
68}
69
70void io_manager::reg (time_watcher *w) { reg (w, tw); }
71void io_manager::unreg (time_watcher *w) { unreg (w, tw); }
72#endif
45 73
46#if IOM_IO 74#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) 75void io_manager::reg (io_watcher *w) { reg (w, iow); }
54{
55 reg (w, iow);
56}
57
58void io_manager::unreg (io_watcher *w) 76void 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 77#endif
91 78
92#if IOM_CHECK 79#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) 80void io_manager::reg (check_watcher *w) { reg (w, cw); }
100{
101 reg (w, cw);
102}
103
104void io_manager::unreg (check_watcher *w) 81void io_manager::unreg (check_watcher *w) { unreg (w, cw); }
105{ 82#endif
106 unreg (w, cw); 83
107} 84#if IOM_IDLE
85void io_manager::reg (idle_watcher *w) { reg (w, iw); }
86void io_manager::unreg (idle_watcher *w) { unreg (w, iw); }
108#endif 87#endif
109 88
110#if IOM_TIME 89#if IOM_TIME
111inline void set_now (void) 90inline void set_now (void)
112{ 91{
… …
124 set_now (); 103 set_now ();
125#endif 104#endif
126 105
127 for (;;) 106 for (;;)
128 { 107 {
108 struct timeval *to = 0;
109 struct timeval tval;
110
111#if IOM_IDLE
112 if (iw.size ())
113 {
114 tval.tv_sec = 0;
115 tval.tv_usec = 0;
116 to = &tval;
117 }
118 else
119#endif
120 {
121#if IOM_TIME
122 time_watcher *next;
123
124 for (;;)
125 {
126 next = tw[0]; // the first time-watcher must exist at ALL times
127
128 for (int i = tw.size (); i--; )
129 if (!tw[i])
130 tw.erase_unordered (i);
131 else if (tw[i]->at < next->at)
132 next = tw[i];
133
134 if (next->at > NOW)
135 {
136 if (next != tw[0])
137 {
138 double diff = next->at - NOW;
139 tval.tv_sec = (int)diff;
140 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000);
141 to = &tval;
142 }
143 break;
144 }
145 else
146 {
147 unreg (next);
148 next->call (*next);
149 }
150 }
151#endif
152 }
153
129#if IOM_CHECK 154#if IOM_CHECK
130 for (int i = 0; i < cw.size (); ++i) 155 for (int i = cw.size (); i--; )
156 if (!cw[i])
157 cw.erase_unordered (i);
158 else
131 cw[i]->call (*cw[i]); 159 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 160#endif
160 161
161#if IOM_IO 162#if IOM_IO
162 fd_set rfd, wfd; 163 fd_set rfd, wfd, efd;
163 164
164 FD_ZERO (&rfd); 165 FD_ZERO (&rfd);
165 FD_ZERO (&wfd); 166 FD_ZERO (&wfd);
166 167
167 int fds = 0; 168 int fds = 0;
168 169
169 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 170 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); )
171 if (*i)
172 {
173 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
174 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
175
176 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
177 }
178
179 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
180 break; // no events
181
182 fds = select (fds, &rfd, &wfd, &efd, to);
183# if IOM_TIME
184 set_now ();
185# endif
186
187 if (fds > 0)
188 for (int i = iow.size (); i--; )
189 if (!iow[i])
190 iow.erase_unordered (i);
191 else
192 {
193 short revents = iow[i]->events;
194
195 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
196 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
197
198 if (revents)
199 iow[i]->call (*iow[i], revents);
200 }
201 else if (fds < 0 && errno != EINTR)
170 { 202 {
171 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 203 perror ("Error while waiting for I/O or time event");
172 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 204 abort ();
173
174 if ((*w)->fd > fds) fds = (*w)->fd;
175 } 205 }
176
177# if IOM_TIME 206#if IOM_IDLE
178 fds = select (fds + 1, &rfd, &wfd, 0, &to); 207 else
179 set_now (); 208 for (int i = iw.size (); i--; )
180# else 209 if (!iw[i])
181 fds = select (fds + 1, &rfd, &wfd, 0, 0); 210 iw.erase_unordered (i);
211 else
212 iw[i]->call (*iw[i]);
182# endif 213#endif
183 214
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 215#elif IOM_TIME
216 if (!to)
217 break;
218
199 select (0, 0, 0, 0, &to); 219 select (0, 0, 0, 0, &to);
200 set_now (); 220 set_now ();
221#else
222 break;
201#endif 223#endif
224 }
202} 225}
203 226
204void io_manager::idle_cb (time_watcher &w) 227// this is a dummy time watcher to ensure that the first
205{ 228// time watcher is _always_ valid, this gets rid of a lot
206 w.at = NOW + 1000000000; 229// of null-pointer-checks
207} 230static struct tw0 : time_watcher {
231 void cb (time_watcher &w)
232 {
233 // should never get called
234 // reached end-of-time, or tstamp has a bogus definition :)
235 abort ();
236 }
237
238 tw0()
239 : time_watcher (this, &tw0::cb)
240 { }
241} tw0;
208 242
209io_manager::io_manager () 243io_manager::io_manager ()
210{ 244{
245 iom_valid = true;
246
247#if IOM_TIME
211 set_now (); 248 set_now ();
212 249
213 iom_valid = true; 250 tw0.start (TSTAMP_MAX);
214
215#if IOM_TIME
216 idle = new time_watcher (this, &io_manager::idle_cb);
217 idle->start (0);
218#endif 251#endif
219} 252}
220 253
221io_manager::~io_manager () 254io_manager::~io_manager ()
222{ 255{

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