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