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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.2 by pcg, Tue Nov 25 15:25:17 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
36template<class watcher>
37void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue)
38{
39 if (!iom_valid)
40 abort ();
41
42 if (!w->active)
43 {
44 queue.push_back (w);
45 w->active = queue.size ();
46 }
47}
48
49template<class watcher>
50void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue)
51{
52 if (!iom_valid)
53 return;
54
55 if (w->active)
56 {
57 queue [w->active - 1] = 0;
58 w->active = 0;
59 }
60}
61
62#if IOM_TIME
33void time_watcher::trigger () 63void time_watcher::trigger ()
34{ 64{
35 call (*this); 65 call (*this);
36 66
37 iom.reg (this); 67 iom.reg (this);
38} 68}
39 69
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) 70void 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) 71void io_manager::unreg (time_watcher *w) { unreg (w, tw); }
70{ 72#endif
71 tw.erase (find (tw.begin (), tw.end (), w));
72}
73 73
74#if IOM_IO
75void io_manager::reg (io_watcher *w) { reg (w, iow); }
76void io_manager::unreg (io_watcher *w) { unreg (w, iow); }
77#endif
78
79#if IOM_CHECK
80void io_manager::reg (check_watcher *w) { reg (w, cw); }
81void io_manager::unreg (check_watcher *w) { unreg (w, cw); }
82#endif
83
84#if IOM_IDLE
85void io_manager::reg (idle_watcher *w) { reg (w, iw); }
86void io_manager::unreg (idle_watcher *w) { unreg (w, iw); }
87#endif
88
89#if IOM_TIME
74inline void set_now (void) 90inline void set_now (void)
75{ 91{
76 struct timeval tv; 92 struct timeval tv;
77 93
78 gettimeofday (&tv, 0); 94 gettimeofday (&tv, 0);
79 95
80 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 96 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
97#endif
81} 98}
82 99
83void io_manager::loop () 100void io_manager::loop ()
84{ 101{
102#if IOM_TIME
85 set_now (); 103 set_now ();
104#endif
86 105
87 for (;;) 106 for (;;)
88 { 107 {
89 time_watcher *w; 108 struct timeval *to = 0;
109 struct timeval tval;
90 110
91 for (;;) 111#if IOM_IDLE
112 if (iw.size ())
92 { 113 {
93 w = tw[0]; 114 tval.tv_sec = 0;
94 115 tval.tv_usec = 0;
95 for (time_watcher **i = tw.begin (); i != tw.end (); ++i) 116 to = &tval;
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 } 117 }
118 else
119#endif
120 {
121#if IOM_TIME
122 time_watcher *next;
109 123
110 struct timeval to; 124 for (;;)
111 double diff = w->at - NOW; 125 {
112 to.tv_sec = (int)diff; 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;
113 to.tv_usec = (int)((diff - to.tv_sec) * 1000000); 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 }
114 153
154#if IOM_CHECK
155 for (int i = cw.size (); i--; )
156 if (!cw[i])
157 cw.erase_unordered (i);
158 else
159 cw[i]->call (*cw[i]);
160#endif
161
162#if IOM_IO
115 fd_set rfd, wfd; 163 fd_set rfd, wfd, efd;
116 164
117 FD_ZERO (&rfd); 165 FD_ZERO (&rfd);
118 FD_ZERO (&wfd); 166 FD_ZERO (&wfd);
119 167
120 int fds = 0; 168 int fds = 0;
121 169
122 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)
123 { 202 {
124 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 203 perror ("Error while waiting for I/O or time event");
125 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 204 abort ();
126
127 if ((*w)->fd > fds) fds = (*w)->fd;
128 } 205 }
206#if IOM_IDLE
207 else
208 for (int i = iw.size (); i--; )
209 if (!iw[i])
210 iw.erase_unordered (i);
211 else
212 iw[i]->call (*iw[i]);
213#endif
129 214
130 fds = select (fds + 1, &rfd, &wfd, 0, &to); 215#elif IOM_TIME
216 if (!to)
217 break;
131 218
219 select (0, 0, 0, 0, &to);
132 set_now (); 220 set_now ();
133 221#else
134 if (fds > 0) 222 break;
135 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 223#endif
136 {
137 short revents = (*w)->events;
138
139 if (!FD_ISSET ((*w)->fd, &rfd)) revents &= ~EVENT_READ;
140 if (!FD_ISSET ((*w)->fd, &wfd)) revents &= ~EVENT_WRITE;
141
142 if (revents)
143 (*w)->call (**w, revents);
144 }
145 } 224 }
146} 225}
147 226
148void io_manager::idle_cb (time_watcher &w) 227// this is a dummy time watcher to ensure that the first
149{ 228// time watcher is _always_ valid, this gets rid of a lot
150 w.at = NOW + 1000000000; 229// of null-pointer-checks
151} 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;
152 242
153io_manager::io_manager () 243io_manager::io_manager ()
154{ 244{
245 iom_valid = true;
246
247#if IOM_TIME
155 set_now (); 248 set_now ();
156 249
157 iom_valid = true; 250 tw0.start (TSTAMP_MAX);
158 251#endif
159 idle = new time_watcher (this, &io_manager::idle_cb);
160 idle->start (0);
161} 252}
162 253
163io_manager::~io_manager () 254io_manager::~io_manager ()
164{ 255{
165 iom_valid = false; 256 iom_valid = false;

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