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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 1.10 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
54template<class watcher>
55void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue)
56{
57 if (!iom_valid)
58 abort ();
59
60 if (!w->active)
61 {
62 queue.push_back (w);
63 w->active = queue.size ();
64 }
65}
66
67template<class watcher>
68void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue)
69{
70 if (!iom_valid)
71 return;
72
73 if (w->active)
74 {
75 queue [w->active - 1] = 0;
76 w->active = 0;
77 }
78}
79
80#if IOM_TIME
33void time_watcher::trigger () 81void time_watcher::trigger ()
34{ 82{
35 call (*this); 83 call (*this);
36 84
37 iom.reg (this); 85 iom.reg (this);
38} 86}
39 87
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) 88void 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) 89void io_manager::unreg (time_watcher *w) { unreg (w, tw); }
72{ 90#endif
73 tw.erase (find (tw.begin (), tw.end (), w));
74}
75 91
92#if IOM_IO
93void io_manager::reg (io_watcher *w) { reg (w, iow); }
94void io_manager::unreg (io_watcher *w) { unreg (w, iow); }
95#endif
96
97#if IOM_CHECK
98void io_manager::reg (check_watcher *w) { reg (w, cw); }
99void io_manager::unreg (check_watcher *w) { unreg (w, cw); }
100#endif
101
102#if IOM_IDLE
103void io_manager::reg (idle_watcher *w) { reg (w, iw); }
104void io_manager::unreg (idle_watcher *w) { unreg (w, iw); }
105#endif
106
107#if IOM_TIME
76inline void set_now (void) 108inline void set_now (void)
77{ 109{
78 struct timeval tv; 110 struct timeval tv;
79 111
80 gettimeofday (&tv, 0); 112 gettimeofday (&tv, 0);
81 113
82 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 114 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
115#endif
83} 116}
84 117
85void io_manager::loop () 118void io_manager::loop ()
86{ 119{
120#if IOM_TIME
87 set_now (); 121 set_now ();
122#endif
88 123
89 for (;;) 124 for (;;)
90 { 125 {
91 time_watcher *w; 126 struct timeval *to = 0;
127 struct timeval tval;
92 128
93 for (;;) 129#if IOM_IDLE
130 if (iw.size ())
94 { 131 {
95 w = tw[0]; 132 tval.tv_sec = 0;
96 133 tval.tv_usec = 0;
97 for (time_watcher **i = tw.begin (); i != tw.end (); ++i) 134 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 } 135 }
136 else
137#endif
138 {
139#if IOM_TIME
140 time_watcher *next;
110 141
111 struct timeval to; 142 for (;;)
112 double diff = w->at - NOW; 143 {
113 to.tv_sec = (int)diff; 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;
114 to.tv_usec = (int)((diff - to.tv_sec) * 1000000); 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 }
115 171
172#if IOM_CHECK
173 for (int i = cw.size (); i--; )
174 if (!cw[i])
175 cw.erase_unordered (i);
176 else
177 cw[i]->call (*cw[i]);
178#endif
179
180#if IOM_IO
116 fd_set rfd, wfd; 181 fd_set rfd, wfd, efd;
117 182
118 FD_ZERO (&rfd); 183 FD_ZERO (&rfd);
119 FD_ZERO (&wfd); 184 FD_ZERO (&wfd);
120 185
121 int fds = 0; 186 int fds = 0;
122 187
123 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)
124 { 220 {
125 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 221 perror ("Error while waiting for I/O or time event");
126 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 222 abort ();
127
128 if ((*w)->fd > fds) fds = (*w)->fd;
129 } 223 }
224#if IOM_IDLE
225 else
226 for (int i = iw.size (); i--; )
227 if (!iw[i])
228 iw.erase_unordered (i);
229 else
230 iw[i]->call (*iw[i]);
231#endif
130 232
131 fds = select (fds + 1, &rfd, &wfd, 0, &to); 233#elif IOM_TIME
234 if (!to)
235 break;
132 236
237 select (0, 0, 0, 0, &to);
133 set_now (); 238 set_now ();
134 239#else
135 if (fds > 0) 240 break;
136 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 241#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 } 242 }
147} 243}
148 244
149void io_manager::idle_cb (time_watcher &w)
150{
151 w.at = NOW + 1000000000;
152}
153
154io_manager::io_manager () 245io_manager::io_manager ()
155{ 246{
247 iom_valid = true;
248
249#if IOM_TIME
156 set_now (); 250 set_now ();
157 251
158 iom_valid = true; 252 tw0.start (TSTAMP_MAX);
159 253 printf ("abort, %f but inly on %f\n", NOW, tw0.at);
160 idle = new time_watcher (this, &io_manager::idle_cb); 254#endif
161 idle->start (0);
162} 255}
163 256
164io_manager::~io_manager () 257io_manager::~io_manager ()
165{ 258{
166 iom_valid = false; 259 iom_valid = false;

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