| 1 | #include <unistd.h> |
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| 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 |
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… | |
| 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 | |
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| 29 | #include "iom.h" |
27 | #include "iom.h" |
| 30 | |
28 | |
| 31 | inline bool lowest_first (const time_watcher *a, const time_watcher *b) |
29 | inline 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; |
| 34 | } |
32 | } |
| 35 | |
33 | |
| 36 | timestamp NOW; |
34 | tstamp NOW; |
| 37 | |
35 | |
| 38 | io_manager iom; |
36 | io_manager iom; |
| 39 | |
37 | |
| 40 | void time_watcher::set (timestamp when) |
38 | void time_watcher::set (tstamp when) |
| 41 | { |
39 | { |
| 42 | iom.unreg (this); |
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| 43 | at = when; |
40 | at = when; |
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41 | |
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42 | if (registered) |
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43 | iom.reschedule_time_watchers (); |
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44 | else |
| 44 | iom.reg (this); |
45 | iom.reg (this); |
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46 | } |
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47 | |
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48 | void time_watcher::trigger () |
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49 | { |
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50 | call (at); |
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51 | |
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52 | if (registered) |
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53 | iom.reschedule_time_watchers (); |
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54 | else |
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55 | iom.reg (this); |
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56 | } |
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57 | |
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58 | void time_watcher::start () |
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59 | { |
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60 | if (!registered) |
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61 | iom.reg (this); |
| 45 | } |
62 | } |
| 46 | |
63 | |
| 47 | void io_manager::reg (int fd, short events, io_watcher *w) |
64 | void io_manager::reg (int fd, short events, io_watcher *w) |
| 48 | { |
65 | { |
| 49 | pollfd pfd; |
66 | pollfd pfd; |
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… | |
| 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 | |
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100 | void io_manager::reschedule_time_watchers () |
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101 | { |
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102 | make_heap (tw.begin (), tw.end (), lowest_first); |
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103 | } |
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104 | |
| 83 | void io_manager::reg (time_watcher *w) |
105 | void io_manager::reg (time_watcher *w) |
| 84 | { |
106 | { |
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107 | if (w->registered) |
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108 | slog (L_CRIT, "FATAL: io_manager::reg(time_watcher) called on already-registered watcher"); |
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109 | |
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110 | w->registered = true; |
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111 | |
| 85 | tw.push_back (w); |
112 | tw.push_back (w); |
| 86 | push_heap (tw.begin (), tw.end (), lowest_first); |
113 | push_heap (tw.begin (), tw.end (), lowest_first); |
| 87 | } |
114 | } |
| 88 | |
115 | |
| 89 | void io_manager::unreg (time_watcher *w) |
116 | void io_manager::unreg (time_watcher *w) |
| 90 | { |
117 | { |
| 91 | unsigned int sz = tw.size (); |
118 | if (w->registered) |
| 92 | unsigned int i = find (tw.begin (), tw.end (), w) - tw.begin (); |
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| 93 | |
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| 94 | if (i != sz) |
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| 95 | { |
119 | { |
| 96 | if (sz == 1) |
120 | unsigned int sz = tw.size (); |
| 97 | tw.clear (); |
121 | unsigned int i = find (tw.begin (), tw.end (), w) - tw.begin (); |
| 98 | else |
122 | |
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123 | if (i != sz) |
| 99 | { |
124 | { |
| 100 | if (i != sz - 1) |
125 | if (i != sz - 1) |
| 101 | tw[i] = tw[sz - 1]; |
126 | tw[i] = tw[sz - 1]; |
| 102 | |
127 | |
| 103 | tw.pop_back (); |
128 | tw.pop_back (); |
| 104 | make_heap (tw.begin (), tw.end (), lowest_first); |
129 | reschedule_time_watchers (); |
| 105 | } |
130 | } |
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131 | |
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132 | w->registered = false; |
| 106 | } |
133 | } |
| 107 | } |
134 | } |
| 108 | |
135 | |
| 109 | inline void set_now (void) |
136 | inline void set_now (void) |
| 110 | { |
137 | { |
| 111 | struct timeval tv; |
138 | struct timeval tv; |
| 112 | |
139 | |
| 113 | gettimeofday (&tv, 0); |
140 | gettimeofday (&tv, 0); |
| 114 | |
141 | |
| 115 | NOW = (timestamp)tv.tv_sec + (timestamp)tv.tv_usec / 1000000; |
142 | NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; |
| 116 | } |
143 | } |
| 117 | |
144 | |
| 118 | void io_manager::loop () |
145 | void io_manager::loop () |
| 119 | { |
146 | { |
| 120 | set_now (); |
147 | set_now (); |
| 121 | |
148 | |
| 122 | for (;;) |
149 | for (;;) |
| 123 | { |
150 | { |
| 124 | int timeout = tw.empty () ? -1 : (int) ((tw[0]->at - NOW) * 1000); |
151 | while (tw[0]->at <= NOW) |
| 125 | |
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| 126 | //printf ("s%d t%d #%d <%f<%f<\n", pfs.size (), timeout, tw.size (), tw[0]->at - NOW, tw[1]->at - NOW); |
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| 127 | |
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| 128 | if (timeout >= 0) |
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| 129 | { |
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| 130 | int fds = poll (&pfs[0], pfs.size (), timeout); |
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| 131 | |
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| 132 | set_now (); |
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| 133 | |
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| 134 | for (unsigned int i = iow.size (); fds && i--; ) |
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| 135 | if (pfs[i].revents) |
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| 136 | { |
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| 137 | --fds; |
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| 138 | iow[i]->call (pfs[i].revents); |
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| 139 | } |
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| 140 | } |
152 | { |
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153 | // remove the first watcher |
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154 | time_watcher *w = tw[0]; |
| 141 | |
155 | |
| 142 | while (!tw.empty () && tw[0]->at <= NOW) |
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| 143 | { |
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| 144 | pop_heap (tw.begin (), tw.end (), lowest_first); |
156 | pop_heap (tw.begin (), tw.end (), lowest_first); |
| 145 | time_watcher *w = tw[tw.size () - 1]; |
157 | tw.pop_back (); |
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158 | |
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159 | w->registered = false; |
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160 | |
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161 | // call it |
| 146 | w->call (w->at); |
162 | w->call (w->at); |
| 147 | push_heap (tw.begin (), tw.end (), lowest_first); |
163 | |
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164 | // re-add it if necessary |
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165 | if (w->at >= 0 && !w->registered) |
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166 | reg (w); |
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167 | } |
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168 | |
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169 | int timeout = (int) ((tw[0]->at - NOW) * 1000); |
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170 | |
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171 | int fds = poll (&pfs[0], pfs.size (), timeout); |
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172 | |
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173 | set_now (); |
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174 | |
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175 | for (unsigned int i = 0; fds > 0 && i < iow.size (); ++i) |
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176 | if (pfs[i].revents) |
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177 | { |
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178 | --fds; |
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179 | iow[i]->call (pfs[i].fd, pfs[i].revents); |
| 148 | } |
180 | } |
| 149 | } |
181 | } |
| 150 | } |
182 | } |
| 151 | |
183 | |
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184 | void io_manager::idle_cb (tstamp &ts) |
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185 | { |
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186 | ts = NOW + 86400; // wake up every day, for no good reason |
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187 | } |
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188 | |
| 152 | io_manager::io_manager () |
189 | io_manager::io_manager () |
| 153 | { |
190 | { |
| 154 | set_now (); |
191 | set_now (); |
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192 | idle = new time_watcher (this, &io_manager::idle_cb); |
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193 | idle->start (0); |
| 155 | } |
194 | } |
| 156 | |
195 | |
| 157 | io_manager::~io_manager () |
196 | io_manager::~io_manager () |
| 158 | { |
197 | { |
| 159 | // |
198 | // |
