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Comparing gvpe/src/iom.C (file contents):
Revision 1.3 by pcg, Fri Mar 21 21:21:02 2003 UTC vs.
Revision 1.12 by pcg, Thu Oct 16 02:41:21 2003 UTC

1/* 1/*
2 iom.C -- I/O multiplexor 2 iom.C -- generic I/O multiplexor
3 Copyright (C) 2003 Marc Lehmann <pcg@goof.com>
3 4
4 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
5 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
6 the Free Software Foundation; either version 2 of the License, or 7 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version. 8 (at your option) any later version.
… …
21#include <sys/time.h> 22#include <sys/time.h>
22 23
23#include <algorithm> 24#include <algorithm>
24#include <functional> 25#include <functional>
25 26
27#include "gettext.h"
28
26#include "slog.h" 29#include "slog.h"
27#include "iom.h" 30#include "iom.h"
28 31
32tstamp NOW;
33bool iom_valid;
34io_manager iom;
35
29inline bool lowest_first (const time_watcher *a, const time_watcher *b) 36inline bool earliest_first (const time_watcher *a, const time_watcher *b)
30{ 37{
31 return a->at > b->at; 38 return a->at > b->at;
32} 39}
33 40
34tstamp NOW;
35
36io_manager iom;
37
38void time_watcher::set (tstamp when) 41void time_watcher::set (tstamp when)
39{ 42{
40 iom.unreg (this);
41 at = when; 43 at = when;
44
45 if (registered)
46 iom.reschedule_time_watchers ();
47}
48
49void time_watcher::trigger ()
50{
51 call (*this);
52
53 if (registered)
54 iom.reschedule_time_watchers ();
55 else
42 iom.reg (this); 56 iom.reg (this);
43} 57}
44 58
45void io_manager::reg (int fd, short events, io_watcher *w) 59time_watcher::~time_watcher ()
46{ 60{
47 pollfd pfd; 61 if (iom_valid)
62 iom.unreg (this);
63}
48 64
49 pfd.fd = fd; 65void io_watcher::set(int fd_, short events_)
66{
67 fd = fd_;
50 pfd.events = events; 68 events = events_;
51 69
70 if (registered)
71 {
72 iom.unreg (this);
73 iom.reg (this);
74 }
75}
76
77io_watcher::~io_watcher ()
78{
79 if (iom_valid)
80 iom.unreg (this);
81}
82
83void io_manager::reg (io_watcher *w)
84{
85 if (!w->registered)
86 {
87 w->registered = true;
88
89 pollfd pfd;
90
91 pfd.fd = w->fd;
92 pfd.events = w->events;
93
52 pfs.push_back (pfd); 94 pfs.push_back (pfd);
53 iow.push_back (w); 95 iow.push_back (w);
96 }
54} 97}
55 98
56void io_manager::unreg (io_watcher *w) 99void io_manager::unreg (io_watcher *w)
57{ 100{
101 if (w->registered)
102 {
103 w->registered = false;
104
58 unsigned int sz = iow.size (); 105 unsigned int sz = iow.size ();
59 unsigned int i = find (iow.begin (), iow.end (), w) - iow.begin (); 106 unsigned int i = find (iow.begin (), iow.end (), w) - iow.begin ();
60 107
61 if (i != sz) 108 assert (i != sz);
62 { 109
63 if (sz == 1) 110 if (sz == 1)
64 { 111 {
65 pfs.clear (); 112 pfs.clear ();
66 iow.clear (); 113 iow.clear ();
67 } 114 }
… …
76 pfs[i] = pfs[sz - 1]; pfs.pop_back (); 123 pfs[i] = pfs[sz - 1]; pfs.pop_back ();
77 } 124 }
78 } 125 }
79} 126}
80 127
128void io_manager::reschedule_time_watchers ()
129{
130 make_heap (tw.begin (), tw.end (), earliest_first);
131}
132
81void io_manager::reg (time_watcher *w) 133void io_manager::reg (time_watcher *w)
82{ 134{
135 if (!w->registered)
136 {
137 w->registered = true;
138
83 tw.push_back (w); 139 tw.push_back (w);
84 push_heap (tw.begin (), tw.end (), lowest_first); 140 push_heap (tw.begin (), tw.end (), earliest_first);
141 }
85} 142}
86 143
87void io_manager::unreg (time_watcher *w) 144void io_manager::unreg (time_watcher *w)
88{ 145{
146 if (w->registered)
147 {
148 w->registered = false;
149
89 unsigned int sz = tw.size (); 150 unsigned int sz = tw.size ();
90 unsigned int i = find (tw.begin (), tw.end (), w) - tw.begin (); 151 unsigned int i = find (tw.begin (), tw.end (), w) - tw.begin ();
91 152
92 if (i != sz) 153 assert (i != sz);
93 {
94 if (sz == 1)
95 tw.clear ();
96 else
97 { 154
98 if (i != sz - 1) 155 if (i != sz - 1)
99 tw[i] = tw[sz - 1]; 156 tw[i] = tw[sz - 1];
100 157
158 tw.pop_back ();
159 reschedule_time_watchers ();
160 }
161}
162
163inline void set_now (void)
164{
165 struct timeval tv;
166
167 gettimeofday (&tv, 0);
168
169 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
170}
171
172void io_manager::loop ()
173{
174 set_now ();
175
176 for (;;)
177 {
178 while (tw[0]->at <= NOW)
179 {
180 // remove the first watcher
181 time_watcher *w = tw[0];
182
183 pop_heap (tw.begin (), tw.end (), earliest_first);
101 tw.pop_back (); 184 tw.pop_back ();
102 make_heap (tw.begin (), tw.end (), lowest_first); 185
186 w->registered = false;
187
188 // call it
189 w->call (*w);
190
191 // re-add it if necessary
192 if (w->at >= 0 && !w->registered)
193 reg (w);
194 }
195
196 int timeout = (int) ((tw[0]->at - NOW) * 1000);
197
198 int fds = poll (&pfs[0], pfs.size (), timeout);
199
200 set_now ();
201
202 vector<io_watcher *>::iterator w;
203 vector<pollfd>::iterator p;
204
205 for (w = iow.begin (), p = pfs.begin ();
206 fds > 0 && w < iow.end ();
207 ++w, ++p)
208 if (p->revents)
209 {
210 --fds;
211
212 if (p->revents & POLLNVAL)
213 {
214 slog (L_ERR, _("io_watcher started on illegal file descriptor, disabling."));
215 (*w)->stop ();
216 }
217 else
218 (*w)->call (**w, p->revents);
103 } 219 }
104 } 220 }
105} 221}
106 222
107inline void set_now (void) 223void io_manager::idle_cb (time_watcher &w)
108{ 224{
109 struct timeval tv; 225 w.at = NOW + 86400; // wake up every day, for no good reason
110
111 gettimeofday (&tv, 0);
112
113 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
114} 226}
115 227
116void io_manager::loop () 228io_manager::io_manager ()
117{ 229{
230 iom_valid = true;
231
118 set_now (); 232 set_now ();
119 233 idle = new time_watcher (this, &io_manager::idle_cb);
120 while (!(iow.empty () && tw.empty ())) 234 idle->start (0);
121 {
122 int timeout = tw.empty ()
123 ? 3600 * 1000 // wake up at least every hour
124 : (int) ((tw[0]->at - NOW) * 1000);
125
126 printf ("s%d t%d #%d\n", pfs.size (), timeout, tw.size ());
127
128 if (timeout >= 0)
129 {
130 int fds = poll (&pfs[0], pfs.size (), timeout);
131
132 set_now ();
133
134 for (unsigned int i = iow.size (); fds && i--; )
135 if (pfs[i].revents)
136 {
137 --fds;
138 iow[i]->call (pfs[i].revents);
139 }
140 }
141
142 while (!tw.empty () && tw[0]->at <= NOW)
143 {
144 pop_heap (tw.begin (), tw.end (), lowest_first);
145 (*(tw.end () - 1))->trigger ();
146 push_heap (tw.begin (), tw.end (), lowest_first);
147 }
148 }
149}
150
151io_manager::io_manager ()
152{
153 set_now ();
154} 235}
155 236
156io_manager::~io_manager () 237io_manager::~io_manager ()
157{ 238{
158 // 239 iom_valid = false;
159} 240}
160 241

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