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Comparing gvpe/src/iom.C (file contents):
Revision 1.2 by pcg, Fri Mar 21 21:17:02 2003 UTC vs.
Revision 1.6 by pcg, Fri Mar 28 04:05:10 2003 UTC

1#include <unistd.h>
2/* 1/*
3 iom.C -- I/O multiplexor 2 iom.C -- I/O multiplexor
4 3
5 This program is free software; you can redistribute it and/or modify 4 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 5 it under the terms of the GNU General Public License as published by
… …
23 22
24#include <algorithm> 23#include <algorithm>
25#include <functional> 24#include <functional>
26 25
27#include "slog.h" 26#include "slog.h"
28
29#include "iom.h" 27#include "iom.h"
30 28
31inline bool lowest_first (const time_watcher *a, const time_watcher *b) 29inline bool lowest_first (const time_watcher *a, const time_watcher *b)
32{ 30{
33 return a->at > b->at; 31 return a->at > b->at;
… …
37 35
38io_manager iom; 36io_manager iom;
39 37
40void time_watcher::set (tstamp when) 38void time_watcher::set (tstamp when)
41{ 39{
42 iom.unreg (this);
43 at = when; 40 at = when;
41
42 if (registered)
43 iom.reschedule_time_watchers ();
44 else
44 iom.reg (this); 45 iom.reg (this);
46}
47
48void time_watcher::trigger ()
49{
50 call (at);
51
52 if (registered)
53 iom.reschedule_time_watchers ();
54 else
55 iom.reg (this);
56}
57
58void time_watcher::start ()
59{
60 if (!registered)
61 iom.reg (this);
45} 62}
46 63
47void io_manager::reg (int fd, short events, io_watcher *w) 64void io_manager::reg (int fd, short events, io_watcher *w)
48{ 65{
49 pollfd pfd; 66 pollfd pfd;
… …
53 70
54 pfs.push_back (pfd); 71 pfs.push_back (pfd);
55 iow.push_back (w); 72 iow.push_back (w);
56} 73}
57 74
58void io_manager::unreg (io_watcher *w) 75void io_manager::unreg (const io_watcher *w)
59{ 76{
60 unsigned int sz = iow.size (); 77 unsigned int sz = iow.size ();
61 unsigned int i = find (iow.begin (), iow.end (), w) - iow.begin (); 78 unsigned int i = find (iow.begin (), iow.end (), w) - iow.begin ();
62 79
63 if (i != sz) 80 if (i != sz)
… …
78 pfs[i] = pfs[sz - 1]; pfs.pop_back (); 95 pfs[i] = pfs[sz - 1]; pfs.pop_back ();
79 } 96 }
80 } 97 }
81} 98}
82 99
100void io_manager::reschedule_time_watchers ()
101{
102 make_heap (tw.begin (), tw.end (), lowest_first);
103}
104
83void io_manager::reg (time_watcher *w) 105void io_manager::reg (time_watcher *w)
84{ 106{
107 if (w->registered)
108 slog (L_CRIT, "FATAL: io_manager::reg(time_watcher) called on already-registered watcher");
109
85 tw.push_back (w); 110 tw.push_back (w);
86 push_heap (tw.begin (), tw.end (), lowest_first); 111 push_heap (tw.begin (), tw.end (), lowest_first);
87} 112}
88 113
89void io_manager::unreg (time_watcher *w) 114void io_manager::unreg (const time_watcher *w)
90{ 115{
91 unsigned int sz = tw.size (); 116 unsigned int sz = tw.size ();
92 unsigned int i = find (tw.begin (), tw.end (), w) - tw.begin (); 117 unsigned int i = find (tw.begin (), tw.end (), w) - tw.begin ();
93 118
94 if (i != sz) 119 if (i != sz)
95 { 120 {
96 if (sz == 1)
97 tw.clear ();
98 else
99 {
100 if (i != sz - 1) 121 if (i != sz - 1)
101 tw[i] = tw[sz - 1]; 122 tw[i] = tw[sz - 1];
102 123
103 tw.pop_back (); 124 tw.pop_back ();
104 make_heap (tw.begin (), tw.end (), lowest_first); 125 reschedule_time_watchers ();
105 }
106 } 126 }
107} 127}
108 128
109inline void set_now (void) 129inline void set_now (void)
110{ 130{
… …
117 137
118void io_manager::loop () 138void io_manager::loop ()
119{ 139{
120 set_now (); 140 set_now ();
121 141
122 while (!(iow.empty () && tw.empty ())) 142 for (;;)
123 { 143 {
124 int timeout = tw.empty () 144 while (tw[0]->at <= NOW)
125 ? 3600 * 1000 // wake up at least every hour 145 {
126 : (int) ((tw[0]->at - NOW) * 1000); 146 pop_heap (tw.begin (), tw.end (), lowest_first);
147 time_watcher *w = *(tw.end () - 1);
148 tw.pop_back ();
127 149
128 printf ("s%d t%d #%d\n", pfs.size (), timeout, tw.size ()); 150 if (w->at >= 0)
151 {
152 w->call (w->at);
129 153
130 if (timeout >= 0) 154 if (!w->registered)
131 { 155 reg (w);
132 int fds = poll (&pfs[0], pfs.size (), timeout);
133
134 set_now ();
135
136 for (unsigned int i = iow.size (); fds && i--; )
137 if (pfs[i].revents)
138 {
139 --fds;
140 iow[i]->call (pfs[i].revents);
141 } 156 }
142 } 157 }
143 158
144 while (!tw.empty () && tw[0]->at <= NOW) 159 int timeout = (int) ((tw[0]->at - NOW) * 1000);
160
161 int fds = poll (&pfs[0], pfs.size (), timeout);
162
163 set_now ();
164
165 for (unsigned int i = iow.size (); fds > 0 && i--; )
166 if (pfs[i].revents)
145 { 167 {
146 pop_heap (tw.begin (), tw.end (), lowest_first); 168 --fds;
147 (*(tw.end () - 1))->trigger (); 169 iow[i]->call (pfs[i].revents);
148 push_heap (tw.begin (), tw.end (), lowest_first);
149 } 170 }
150 } 171 }
172}
173
174void io_manager::idle_cb (tstamp &ts)
175{
176 ts = NOW + 86400; // wake up every day, for no good reason
151} 177}
152 178
153io_manager::io_manager () 179io_manager::io_manager ()
154{ 180{
155 set_now (); 181 set_now ();
182 idle = new time_watcher (this, &io_manager::idle_cb);
183 idle->start (0);
156} 184}
157 185
158io_manager::~io_manager () 186io_manager::~io_manager ()
159{ 187{
160 // 188 //

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