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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 1.14 by pcg, Fri Feb 13 12:16:21 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 {
46 void cb (time_watcher &w)
47 {
48 // should never get called
49 // reached end-of-time, or tstamp has a bogus definition,
50 // or compiler initilization order broken, or somethine else :)
51 abort ();
52 }
53
54 tw0 ()
55 : time_watcher (this, &tw0::cb)
56 { }}
57tw0;
58
29tstamp NOW; 59tstamp NOW;
30bool iom_valid; 60static bool iom_valid;
31io_manager iom; 61io_manager iom;
32 62
33template<class watcher> 63template<class watcher>
34void io_manager::reg (watcher *w, simplevec<watcher *> &queue) 64void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue)
35{ 65{
36 if (find (queue.begin (), queue.end (), w) == queue.end ()) 66 if (!iom_valid)
67 abort ();
68
69 if (!w->active)
70 {
71#if IOM_CHECK
72 queue.activity = true;
73#endif
37 queue.push_back (w); 74 queue.push_back (w);
75 w->active = queue.size ();
76 }
38} 77}
39 78
40template<class watcher> 79template<class watcher>
41void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) 80void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue)
42{ 81{
43 queue.erase (find (queue.begin (), queue.end (), w)); 82 if (!iom_valid)
83 return;
84
85 if (w->active)
86 {
87 queue [w->active - 1] = 0;
88 w->active = 0;
89 }
44} 90}
91
92#if IOM_TIME
93void time_watcher::trigger ()
94{
95 call (*this);
96
97 iom.reg (this);
98}
99
100void io_manager::reg (time_watcher *w) { reg (w, tw); }
101void io_manager::unreg (time_watcher *w) { unreg (w, tw); }
102#endif
45 103
46#if IOM_IO 104#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) 105void io_manager::reg (io_watcher *w) { reg (w, iow); }
54{
55 reg (w, iow);
56}
57
58void io_manager::unreg (io_watcher *w) 106void 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 107#endif
91 108
92#if IOM_CHECK 109#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) 110void io_manager::reg (check_watcher *w) { reg (w, cw); }
100{
101 reg (w, cw);
102}
103
104void io_manager::unreg (check_watcher *w) 111void io_manager::unreg (check_watcher *w) { unreg (w, cw); }
105{ 112#endif
106 unreg (w, cw); 113
107} 114#if IOM_IDLE
115void io_manager::reg (idle_watcher *w) { reg (w, iw); }
116void io_manager::unreg (idle_watcher *w) { unreg (w, iw); }
108#endif 117#endif
109 118
110#if IOM_TIME 119#if IOM_TIME
111inline void set_now (void) 120inline void set_now (void)
112{ 121{
… …
124 set_now (); 133 set_now ();
125#endif 134#endif
126 135
127 for (;;) 136 for (;;)
128 { 137 {
138 struct timeval *to = 0;
139 struct timeval tval;
140
141#if IOM_IDLE
142 if (iw.size ())
143 {
144 tval.tv_sec = 0;
145 tval.tv_usec = 0;
146 to = &tval;
147 }
148 else
149#endif
150
151 {
152#if IOM_TIME
153 time_watcher *next;
154
155 for (;;)
156 {
157 next = tw[0]; // the first time-watcher must exist at ALL times
158
159 for (int i = tw.size (); i--; )
160 if (!tw[i])
161 tw.erase_unordered (i);
162 else if (tw[i]->at < next->at)
163 next = tw[i];
164
165 if (next->at > NOW)
166 {
167 if (next != tw[0])
168 {
169 double diff = next->at - NOW;
170 tval.tv_sec = (int)diff;
171 tval.tv_usec = (int) ((diff - tval.tv_sec) * 1000000);
172 to = &tval;
173 }
174 break;
175 }
176 else
177 {
178 unreg (next);
179 next->call (*next);
180 }
181 }
182#endif
183
184 }
185
129#if IOM_CHECK 186#if IOM_CHECK
187 tw.activity = false;
188
130 for (int i = 0; i < cw.size (); ++i) 189 for (int i = cw.size (); i--; )
190 if (!cw[i])
191 cw.erase_unordered (i);
192 else
131 cw[i]->call (*cw[i]); 193 cw[i]->call (*cw[i]);
132#endif
133 194
134#if IOM_TIME 195 if (tw.activity)
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 } 196 {
154 197 tval.tv_sec = 0;
155 double diff = w->at - NOW; 198 tval.tv_usec = 0;
156 struct timeval to; 199 to = &tval;
157 to.tv_sec = (int)diff; 200 }
158 to.tv_usec = (int)((diff - to.tv_sec) * 1000000);
159#endif 201#endif
160 202
161#if IOM_IO 203#if IOM_IO
162 fd_set rfd, wfd; 204 fd_set rfd, wfd, efd;
163 205
164 FD_ZERO (&rfd); 206 FD_ZERO (&rfd);
165 FD_ZERO (&wfd); 207 FD_ZERO (&wfd);
166 208
167 int fds = 0; 209 int fds = 0;
168 210
169 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 211 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); )
212 if (*i)
170 { 213 {
171 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 214 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
172 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 215 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
173 216
174 if ((*w)->fd > fds) fds = (*w)->fd; 217 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
175 } 218 }
176 219
220 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
221 break; // no events
222
223 fds = select (fds, &rfd, &wfd, &efd, to);
177# if IOM_TIME 224# if IOM_TIME
178 fds = select (fds + 1, &rfd, &wfd, 0, &to);
179 set_now (); 225 set_now ();
180# else
181 fds = select (fds + 1, &rfd, &wfd, 0, 0);
182# endif 226# endif
183 227
184 if (fds > 0) 228 if (fds > 0)
185 for (int i = 0; i < iow.size (); ++i) 229 for (int i = iow.size (); i--; )
230 if (!iow[i])
231 iow.erase_unordered (i);
232 else
186 { 233 {
187 io_watcher *w = iow[i];
188
189 short revents = w->events; 234 short revents = iow[i]->events;
190 235
191 if (!FD_ISSET (w->fd, &rfd)) revents &= ~EVENT_READ; 236 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
192 if (!FD_ISSET (w->fd, &wfd)) revents &= ~EVENT_WRITE; 237 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
193 238
194 if (revents) 239 if (revents)
195 w->call (*w, revents); 240 iow[i]->call (*iow[i], revents);
196 } 241 }
197 } 242 else if (fds < 0 && errno != EINTR)
243 {
244 perror ("Error while waiting for I/O or time event");
245 abort ();
246 }
247#if IOM_IDLE
248 else
249 for (int i = iw.size (); i--; )
250 if (!iw[i])
251 iw.erase_unordered (i);
252 else
253 iw[i]->call (*iw[i]);
254#endif
255
198#elif IOM_TIME 256#elif IOM_TIME
257 if (!to)
258 break;
259
199 select (0, 0, 0, 0, &to); 260 select (0, 0, 0, 0, &to);
200 set_now (); 261 set_now ();
262#else
263 break;
201#endif 264#endif
202}
203 265
204void io_manager::idle_cb (time_watcher &w) 266 }
205{
206 w.at = NOW + 1000000000;
207} 267}
208 268
209io_manager::io_manager () 269io_manager::io_manager ()
210{ 270{
271 iom_valid = true;
272
273#if IOM_TIME
211 set_now (); 274 set_now ();
212 275
213 iom_valid = true; 276 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 277#endif
219} 278}
220 279
221io_manager::~io_manager () 280io_manager::~io_manager ()
222{ 281{

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