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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 1.9 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 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) 70void 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) 71void io_manager::unreg (time_watcher *w) { unreg (w, tw); }
72{ 72#endif
73 tw.erase (find (tw.begin (), tw.end (), w));
74}
75 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
76inline void set_now (void) 90inline void set_now (void)
77{ 91{
78 struct timeval tv; 92 struct timeval tv;
79 93
80 gettimeofday (&tv, 0); 94 gettimeofday (&tv, 0);
81 95
82 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 96 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
97#endif
83} 98}
84 99
85void io_manager::loop () 100void io_manager::loop ()
86{ 101{
102#if IOM_TIME
87 set_now (); 103 set_now ();
104#endif
88 105
89 for (;;) 106 for (;;)
90 { 107 {
91 time_watcher *w; 108 struct timeval *to = 0;
109 struct timeval tval;
92 110
93 for (;;) 111#if IOM_IDLE
112 if (iw.size ())
94 { 113 {
95 w = tw[0]; 114 tval.tv_sec = 0;
96 115 tval.tv_usec = 0;
97 for (time_watcher **i = tw.begin (); i != tw.end (); ++i) 116 to = &tval;
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 } 117 }
118 else
119#endif
120 {
121#if IOM_TIME
122 time_watcher *next;
110 123
111 struct timeval to; 124 for (;;)
112 double diff = w->at - NOW; 125 {
113 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;
114 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 }
115 153
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
116 fd_set rfd, wfd; 163 fd_set rfd, wfd, efd;
117 164
118 FD_ZERO (&rfd); 165 FD_ZERO (&rfd);
119 FD_ZERO (&wfd); 166 FD_ZERO (&wfd);
120 167
121 int fds = 0; 168 int fds = 0;
122 169
123 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)
124 { 202 {
125 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 203 perror ("Error while waiting for I/O or time event");
126 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 204 abort ();
127
128 if ((*w)->fd > fds) fds = (*w)->fd;
129 } 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
130 214
131 fds = select (fds + 1, &rfd, &wfd, 0, &to); 215#elif IOM_TIME
216 if (!to)
217 break;
132 218
219 select (0, 0, 0, 0, &to);
133 set_now (); 220 set_now ();
134 221#else
135 if (fds > 0) 222 break;
136 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 223#endif
137 {
138 short revents = (*w)->events;
139
140 if (!FD_ISSET ((*w)->fd, &rfd)) revents &= ~EVENT_READ;
141 if (!FD_ISSET ((*w)->fd, &wfd)) revents &= ~EVENT_WRITE;
142
143 if (revents)
144 (*w)->call (**w, revents);
145 }
146 } 224 }
147} 225}
148 226
149void io_manager::idle_cb (time_watcher &w) 227// this is a dummy time watcher to ensure that the first
150{ 228// time watcher is _always_ valid, this gets rid of a lot
151 w.at = NOW + 1000000000; 229// of null-pointer-checks
152} 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;
153 242
154io_manager::io_manager () 243io_manager::io_manager ()
155{ 244{
245 iom_valid = true;
246
247#if IOM_TIME
156 set_now (); 248 set_now ();
157 249
158 iom_valid = true; 250 tw0.start (TSTAMP_MAX);
159 251#endif
160 idle = new time_watcher (this, &io_manager::idle_cb);
161 idle->start (0);
162} 252}
163 253
164io_manager::~io_manager () 254io_manager::~io_manager ()
165{ 255{
166 iom_valid = false; 256 iom_valid = false;

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