ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/rxvt-unicode/src/iom.C
(Generate patch)

Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.3 by pcg, Tue Nov 25 17:11:33 2003 UTC vs.
Revision 1.11 by pcg, Mon Jan 19 17:26:43 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/time.h>
25
26#if 1 // older unices need these includes for select(2)
27# include <unistd.h>
28# include <sys/types.h>
29#endif
30
31// if the BSDs would at least be marginally POSIX-compatible.. *sigh*
32// until that happens, sys/select.h must come last
24#include <sys/select.h> 33#include <sys/select.h>
25#include <sys/time.h>
26 34
27#include "iom.h" 35#include "iom.h"
28 36
37// TSTAMP_MAX must still fit into a positive struct timeval
38#define TSTAMP_MAX (double)(1UL<<31)
39
40// this is a dummy time watcher to ensure that the first
41// time watcher is _always_ valid, this gets rid of a lot
42// of null-pointer-checks
43// (must come _before_ iom is being defined)
44static struct tw0 : time_watcher {
45 void cb (time_watcher &w)
46 {
47 // should never get called
48 // reached end-of-time, or tstamp has a bogus definition,
49 // or compiler initilization order broken, or somethine else :)
50 abort ();
51 }
52
53 tw0()
54 : time_watcher (this, &tw0::cb)
55 { }
56} tw0;
57
29tstamp NOW; 58tstamp NOW;
30bool iom_valid; 59static bool iom_valid;
31io_manager iom; 60io_manager iom;
32 61
62template<class watcher>
63void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue)
64{
65 if (!iom_valid)
66 abort ();
67
68 if (!w->active)
69 {
70 queue.push_back (w);
71 w->active = queue.size ();
72 }
73}
74
75template<class watcher>
76void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue)
77{
78 if (!iom_valid)
79 return;
80
81 if (w->active)
82 {
83 queue [w->active - 1] = 0;
84 w->active = 0;
85 }
86}
87
88#if IOM_TIME
33void time_watcher::trigger () 89void time_watcher::trigger ()
34{ 90{
35 call (*this); 91 call (*this);
36 92
37 iom.reg (this); 93 iom.reg (this);
38} 94}
39 95
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) 96void 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) 97void io_manager::unreg (time_watcher *w) { unreg (w, tw); }
72{ 98#endif
73 tw.erase (find (tw.begin (), tw.end (), w));
74}
75 99
100#if IOM_IO
101void io_manager::reg (io_watcher *w) { reg (w, iow); }
102void io_manager::unreg (io_watcher *w) { unreg (w, iow); }
103#endif
104
105#if IOM_CHECK
106void io_manager::reg (check_watcher *w) { reg (w, cw); }
107void io_manager::unreg (check_watcher *w) { unreg (w, cw); }
108#endif
109
110#if IOM_IDLE
111void io_manager::reg (idle_watcher *w) { reg (w, iw); }
112void io_manager::unreg (idle_watcher *w) { unreg (w, iw); }
113#endif
114
115#if IOM_TIME
76inline void set_now (void) 116inline void set_now (void)
77{ 117{
78 struct timeval tv; 118 struct timeval tv;
79 119
80 gettimeofday (&tv, 0); 120 gettimeofday (&tv, 0);
81 121
82 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 122 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
123#endif
83} 124}
84 125
85void io_manager::loop () 126void io_manager::loop ()
86{ 127{
128#if IOM_TIME
87 set_now (); 129 set_now ();
130#endif
88 131
89 for (;;) 132 for (;;)
90 { 133 {
91 time_watcher *w; 134 struct timeval *to = 0;
135 struct timeval tval;
92 136
93 for (;;) 137#if IOM_IDLE
138 if (iw.size ())
94 { 139 {
95 w = tw[0]; 140 tval.tv_sec = 0;
96 141 tval.tv_usec = 0;
97 for (time_watcher **i = tw.begin (); i != tw.end (); ++i) 142 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 } 143 }
144 else
145#endif
146 {
147#if IOM_TIME
148 time_watcher *next;
110 149
111 struct timeval to; 150 for (;;)
112 double diff = w->at - NOW; 151 {
113 to.tv_sec = (int)diff; 152 next = tw[0]; // the first time-watcher must exist at ALL times
153
154 for (int i = tw.size (); i--; )
155 if (!tw[i])
156 tw.erase_unordered (i);
157 else if (tw[i]->at < next->at)
158 next = tw[i];
159
160 if (next->at > NOW)
161 {
162 if (next != tw[0])
163 {
164 double diff = next->at - NOW;
165 tval.tv_sec = (int)diff;
114 to.tv_usec = (int)((diff - to.tv_sec) * 1000000); 166 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000);
167 to = &tval;
168 }
169 break;
170 }
171 else
172 {
173 unreg (next);
174 next->call (*next);
175 }
176 }
177#endif
178 }
115 179
180#if IOM_CHECK
181 for (int i = cw.size (); i--; )
182 if (!cw[i])
183 cw.erase_unordered (i);
184 else
185 cw[i]->call (*cw[i]);
186#endif
187
188#if IOM_IO
116 fd_set rfd, wfd; 189 fd_set rfd, wfd, efd;
117 190
118 FD_ZERO (&rfd); 191 FD_ZERO (&rfd);
119 FD_ZERO (&wfd); 192 FD_ZERO (&wfd);
120 193
121 int fds = 0; 194 int fds = 0;
122 195
123 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 196 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); )
197 if (*i)
198 {
199 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
200 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
201
202 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
203 }
204
205 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
206 break; // no events
207
208 fds = select (fds, &rfd, &wfd, &efd, to);
209# if IOM_TIME
210 set_now ();
211# endif
212
213 if (fds > 0)
214 for (int i = iow.size (); i--; )
215 if (!iow[i])
216 iow.erase_unordered (i);
217 else
218 {
219 short revents = iow[i]->events;
220
221 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
222 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
223
224 if (revents)
225 iow[i]->call (*iow[i], revents);
226 }
227 else if (fds < 0 && errno != EINTR)
124 { 228 {
125 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 229 perror ("Error while waiting for I/O or time event");
126 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 230 abort ();
127
128 if ((*w)->fd > fds) fds = (*w)->fd;
129 } 231 }
232#if IOM_IDLE
233 else
234 for (int i = iw.size (); i--; )
235 if (!iw[i])
236 iw.erase_unordered (i);
237 else
238 iw[i]->call (*iw[i]);
239#endif
130 240
131 fds = select (fds + 1, &rfd, &wfd, 0, &to); 241#elif IOM_TIME
242 if (!to)
243 break;
132 244
245 select (0, 0, 0, 0, &to);
133 set_now (); 246 set_now ();
134 247#else
135 if (fds > 0) 248 break;
136 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 249#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 } 250 }
147} 251}
148 252
149void io_manager::idle_cb (time_watcher &w)
150{
151 w.at = NOW + 1000000000;
152}
153
154io_manager::io_manager () 253io_manager::io_manager ()
155{ 254{
255 iom_valid = true;
256
257#if IOM_TIME
156 set_now (); 258 set_now ();
157 259
158 iom_valid = true; 260 tw0.start (TSTAMP_MAX);
159 261#endif
160 idle = new time_watcher (this, &io_manager::idle_cb);
161 idle->start (0);
162} 262}
163 263
164io_manager::~io_manager () 264io_manager::~io_manager ()
165{ 265{
166 iom_valid = false; 266 iom_valid = false;

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines