1 | /* |
1 | /* |
2 | iom.C -- I/O multiplexor |
2 | iom.C -- generic I/O multiplexer |
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3 | Copyright (C) 2003, 2004 Marc Lehmann <gvpe@schmorp.de> |
3 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
4 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
8 | 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 |
9 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
10 | (at your option) any later version. |
8 | |
11 | |
9 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
13 | |
16 | |
14 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License |
15 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
17 | */ |
20 | */ |
18 | |
21 | |
19 | #include "config.h" |
22 | #include "iom.h" |
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23 | |
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24 | #include <cstdio> |
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25 | #include <cstdlib> |
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26 | #include <cerrno> |
20 | |
27 | |
21 | #include <sys/time.h> |
28 | #include <sys/time.h> |
22 | |
29 | |
23 | #include <algorithm> |
30 | #include <assert.h> |
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31 | |
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32 | #if 1 // older unices need these includes for select (2) |
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33 | # include <unistd.h> |
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34 | # include <sys/types.h> |
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35 | # include <time.h> |
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36 | #endif |
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37 | |
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38 | // for IOM_SIG |
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39 | #if IOM_SIG |
24 | #include <functional> |
40 | # include <csignal> |
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41 | # include <fcntl.h> |
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42 | #endif |
25 | |
43 | |
26 | #include "slog.h" |
44 | // if the BSDs would at least be marginally POSIX-compatible.. *sigh* |
27 | #include "iom.h" |
45 | // until that happens, sys/select.h must come last |
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46 | #include <sys/select.h> |
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47 | |
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48 | #define TIMEVAL timeval |
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49 | #define TV_FRAC tv_usec |
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50 | #define TV_MULT 1000000L |
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51 | |
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52 | #if IOM_IO |
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53 | static io_manager_vec<io_watcher> iow; |
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54 | #endif |
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55 | #if IOM_CHECK |
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56 | static io_manager_vec<check_watcher> cw; |
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57 | #endif |
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58 | #if IOM_TIME |
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59 | static io_manager_vec<time_watcher> tw; |
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60 | #endif |
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61 | #if IOM_IDLE |
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62 | static io_manager_vec<idle_watcher> iw; |
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63 | #endif |
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64 | #if IOM_SIG |
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65 | static int sigpipe[2]; // signal signalling pipe |
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66 | static sigset_t sigs; |
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67 | struct sig_vec : io_manager_vec<sig_watcher> { |
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68 | int pending; |
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69 | sig_vec () |
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70 | : pending (false) |
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71 | { } |
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72 | }; |
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73 | static vector<sig_vec *> sw; |
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74 | #endif |
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75 | |
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76 | // this is a dummy time watcher to ensure that the first |
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77 | // time watcher is _always_ valid, this gets rid of a lot |
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78 | // of null-pointer-checks |
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79 | // (must come _before_ iom is being defined) |
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80 | static struct tw0 : time_watcher |
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81 | { |
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82 | void cb (time_watcher &w) |
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83 | { |
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84 | // should never get called |
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85 | // reached end-of-time, or tstamp has a bogus definition, |
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86 | // or compiler initialisation order broken, or something else :) |
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87 | abort (); |
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88 | } |
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89 | |
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90 | tw0 () |
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91 | : time_watcher (this, &tw0::cb) |
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92 | { } |
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93 | } tw0; |
28 | |
94 | |
29 | tstamp NOW; |
95 | tstamp NOW; |
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96 | |
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97 | #if IOM_TIME |
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98 | tstamp io_manager::now () |
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99 | { |
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100 | struct timeval tv; |
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101 | |
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102 | gettimeofday (&tv, 0); |
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103 | return (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000.; |
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104 | } |
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105 | |
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106 | void io_manager::set_now () |
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107 | { |
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108 | NOW = now (); |
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109 | } |
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110 | #endif |
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111 | |
30 | bool iom_valid; |
112 | static bool iom_valid; |
31 | io_manager iom; |
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32 | |
113 | |
33 | inline bool earliest_first (const time_watcher *a, const time_watcher *b) |
114 | // used for initialisation only |
34 | { |
115 | static struct init { |
35 | return a->at > b->at; |
116 | init () |
36 | } |
117 | { |
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118 | #if IOM_SIG |
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119 | sigemptyset (&sigs); |
37 | |
120 | |
38 | void time_watcher::set (tstamp when) |
121 | if (pipe (sigpipe)) |
39 | { |
122 | { |
40 | at = when; |
123 | perror ("io_manager: unable to create signal pipe, aborting."); |
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124 | abort (); |
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125 | } |
41 | |
126 | |
42 | if (registered) |
127 | fcntl (sigpipe[0], F_SETFL, O_NONBLOCK); fcntl (sigpipe[0], F_SETFD, FD_CLOEXEC); |
43 | iom.reschedule_time_watchers (); |
128 | fcntl (sigpipe[1], F_SETFL, O_NONBLOCK); fcntl (sigpipe[1], F_SETFD, FD_CLOEXEC); |
44 | else |
129 | #endif |
45 | iom.reg (this); |
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46 | } |
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47 | |
130 | |
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131 | iom_valid = true; |
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132 | |
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133 | #if IOM_TIME |
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134 | io_manager::set_now (); |
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135 | |
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136 | tw0.start (TSTAMP_MAX); |
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137 | #endif |
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138 | } |
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139 | |
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140 | static void required (); |
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141 | } init; |
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142 | |
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143 | void |
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144 | init::required () |
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145 | { |
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146 | if (!iom_valid) |
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147 | { |
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148 | write (2, "io_manager: early registration attempt, aborting.\n", |
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149 | sizeof ("io_manager: early registration attempt, aborting.\n") - 1); |
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150 | abort (); |
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151 | } |
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152 | } |
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153 | |
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154 | template<class watcher> |
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155 | void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue) |
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156 | { |
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157 | init::required (); |
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158 | |
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159 | if (!w.active) |
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160 | { |
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161 | queue.push_back (&w); |
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162 | w.active = queue.size (); |
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163 | } |
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164 | } |
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165 | |
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166 | template<class watcher> |
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167 | void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue) |
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168 | { |
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169 | if (!iom_valid) |
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170 | return; |
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171 | |
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172 | if (w.active) |
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173 | { |
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174 | queue [w.active - 1] = 0; |
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175 | w.active = 0; |
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176 | } |
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177 | } |
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178 | |
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179 | #if IOM_TIME |
48 | void time_watcher::trigger () |
180 | void time_watcher::trigger () |
49 | { |
181 | { |
50 | call (*this); |
182 | call (*this); |
51 | |
183 | io_manager::reg (*this); |
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 | } |
184 | } |
57 | |
185 | |
58 | void time_watcher::start () |
186 | void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); } |
59 | { |
187 | void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); } |
60 | if (!registered) |
188 | #endif |
61 | iom.reg (this); |
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62 | } |
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63 | |
189 | |
64 | time_watcher::~time_watcher () |
190 | #if IOM_IO |
65 | { |
191 | void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); } |
66 | if (iom_valid) |
192 | void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); } |
67 | iom.unreg (this); |
193 | #endif |
68 | } |
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69 | |
194 | |
70 | io_watcher::~io_watcher () |
195 | #if IOM_CHECK |
71 | { |
196 | void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); } |
72 | if (iom_valid) |
197 | void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); } |
73 | iom.unreg (this); |
198 | #endif |
74 | } |
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75 | |
199 | |
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200 | #if IOM_IDLE |
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201 | void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); } |
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202 | void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); } |
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203 | #endif |
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204 | |
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205 | #if IOM_SIG |
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206 | static void |
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207 | sighandler (int signum) |
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208 | { |
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209 | sw [signum - 1]->pending = true; |
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210 | |
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211 | // we use a pipe for signal notifications, as most current |
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212 | // OSes (Linux...) do not implement pselect correctly. ugh. |
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213 | char ch = signum; // actual content not used |
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214 | write (sigpipe[1], &ch, 1); |
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215 | } |
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216 | |
76 | void io_manager::reg (io_watcher *w) |
217 | void io_manager::reg (sig_watcher &w) |
77 | { |
218 | { |
78 | pollfd pfd; |
219 | assert (0 < w.signum); |
79 | |
220 | |
80 | pfs.push_back (pfd); |
221 | sw.reserve (w.signum); |
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222 | |
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223 | while (sw.size () < w.signum) // pathetic |
81 | iow.push_back (w); |
224 | sw.push_back (0); |
82 | |
225 | |
83 | w->p = &(*(pfs.end () - 1)); |
226 | sig_vec *&sv = sw[w.signum - 1]; |
84 | } |
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85 | |
227 | |
86 | void io_manager::unreg (io_watcher *w) |
228 | if (!sv) |
87 | { |
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88 | if (w->p) |
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89 | { |
229 | { |
90 | unsigned int sz = iow.size (); |
230 | sv = new sig_vec; |
91 | unsigned int i = find (iow.begin (), iow.end (), w) - iow.begin (); |
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92 | |
231 | |
93 | assert (i != sz); |
232 | sigaddset (&sigs, w.signum); |
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233 | sigprocmask (SIG_BLOCK, &sigs, NULL); |
94 | |
234 | |
95 | if (sz == 1) |
235 | struct sigaction sa; |
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236 | sa.sa_handler = sighandler; |
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237 | sigfillset (&sa.sa_mask); |
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238 | sa.sa_flags = SA_RESTART; |
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239 | |
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240 | if (sigaction (w.signum, &sa, 0)) |
96 | { |
241 | { |
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242 | perror ("io_manager: error while installing signal handler, ignoring."); |
97 | pfs.clear (); |
243 | abort (); |
98 | iow.clear (); |
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99 | } |
244 | } |
100 | else if (i == sz - 1) |
245 | |
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246 | } |
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247 | |
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248 | io_manager::reg (w, *sv); |
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249 | } |
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250 | |
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251 | void io_manager::unreg (sig_watcher &w) |
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252 | { |
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253 | if (!w.active) |
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254 | return; |
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255 | |
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256 | assert (0 < w.signum && w.signum <= sw.size ()); |
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257 | |
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258 | io_manager::unreg (w, *sw[w.signum - 1]); |
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259 | } |
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260 | |
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261 | void sig_watcher::start (int signum) |
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262 | { |
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263 | stop (); |
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264 | this->signum = signum; |
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265 | io_manager::reg (*this); |
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266 | } |
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267 | #endif |
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268 | |
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269 | void io_manager::loop () |
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270 | { |
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271 | init::required (); |
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272 | |
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273 | #if IOM_TIME |
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274 | set_now (); |
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275 | #endif |
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276 | |
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277 | for (;;) |
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278 | { |
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279 | |
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280 | #if IOM_TIME |
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281 | // call pending time watchers |
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282 | { |
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283 | bool activity; |
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284 | |
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285 | do |
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286 | { |
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287 | activity = false; |
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288 | |
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289 | for (int i = tw.size (); i--; ) |
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290 | if (!tw[i]) |
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291 | tw.erase_unordered (i); |
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292 | else if (tw[i]->at <= NOW) |
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293 | { |
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294 | time_watcher &w = *tw[i]; |
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295 | |
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296 | unreg (w); |
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297 | w.call (w); |
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298 | |
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299 | activity = true; |
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300 | } |
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301 | } |
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302 | while (activity); |
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303 | } |
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304 | #endif |
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305 | |
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306 | #if IOM_CHECK |
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307 | // call all check watchers |
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308 | for (int i = cw.size (); i--; ) |
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309 | if (!cw[i]) |
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310 | cw.erase_unordered (i); |
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311 | else |
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312 | cw[i]->call (*cw[i]); |
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313 | #endif |
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314 | |
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315 | struct TIMEVAL *to = 0; |
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316 | struct TIMEVAL tval; |
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317 | |
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318 | #if IOM_IDLE |
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319 | if (iw.size ()) |
101 | { |
320 | { |
102 | iow.pop_back (); |
321 | tval.tv_sec = 0; |
103 | pfs.pop_back (); |
322 | tval.TV_FRAC = 0; |
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323 | to = &tval; |
104 | } |
324 | } |
105 | else |
325 | else |
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326 | #endif |
106 | { |
327 | { |
107 | iow[i] = iow[sz - 1]; iow.pop_back (); |
328 | #if IOM_TIME |
108 | pfs[i] = pfs[sz - 1]; pfs.pop_back (); |
329 | // find earliest active watcher |
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330 | time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times |
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331 | |
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332 | for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); ) |
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333 | if (*i && (*i)->at < next->at) |
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334 | next = *i; |
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335 | |
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336 | if (next->at > NOW && next != tw[0]) |
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337 | { |
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338 | double diff = next->at - NOW; |
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339 | tval.tv_sec = (int)diff; |
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340 | tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT); |
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341 | to = &tval; |
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342 | } |
109 | } |
343 | } |
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344 | #endif |
110 | |
345 | |
111 | w->p = 0; |
346 | #if IOM_IO || IOM_SIG |
112 | } |
347 | fd_set rfd, wfd; |
113 | } |
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114 | |
348 | |
115 | void io_manager::reschedule_time_watchers () |
349 | FD_ZERO (&rfd); |
116 | { |
350 | FD_ZERO (&wfd); |
117 | make_heap (tw.begin (), tw.end (), earliest_first); |
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118 | } |
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119 | |
351 | |
120 | void io_manager::reg (time_watcher *w) |
352 | int fds = 0; |
121 | { |
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122 | w->registered = true; |
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123 | |
353 | |
124 | tw.push_back (w); |
354 | # if IOM_IO |
125 | push_heap (tw.begin (), tw.end (), earliest_first); |
355 | for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); ) |
126 | } |
356 | if (*i) |
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357 | { |
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358 | if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); |
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359 | if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); |
127 | |
360 | |
128 | void io_manager::unreg (time_watcher *w) |
361 | if ((*i)->fd >= fds) fds = (*i)->fd + 1; |
129 | { |
362 | } |
130 | if (w->registered) |
363 | # endif |
131 | { |
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132 | unsigned int sz = tw.size (); |
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133 | unsigned int i = find (tw.begin (), tw.end (), w) - tw.begin (); |
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134 | |
364 | |
135 | assert (i != sz); |
365 | if (!to && !fds) //TODO: also check idle_watchers and check_watchers? |
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366 | break; // no events |
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367 | |
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368 | # if IOM_SIG |
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369 | FD_SET (sigpipe[0], &rfd); |
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370 | if (sigpipe[0] >= fds) fds = sigpipe[0] + 1; |
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371 | # endif |
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372 | |
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373 | # if IOM_SIG |
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374 | // there is no race, as we use a pipe for signals, so select |
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375 | // will return if a signal is caught. |
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376 | sigprocmask (SIG_UNBLOCK, &sigs, NULL); |
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377 | # endif |
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378 | fds = select (fds, &rfd, &wfd, NULL, to); |
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379 | # if IOM_SIG |
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380 | sigprocmask (SIG_BLOCK, &sigs, NULL); |
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381 | # endif |
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382 | |
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383 | # if IOM_TIME |
136 | |
384 | { |
137 | if (i != sz - 1) |
385 | // update time, try to compensate for gross non-monotonic time changes |
138 | tw[i] = tw[sz - 1]; |
386 | tstamp diff = NOW; |
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387 | set_now (); |
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388 | diff = NOW - diff; |
139 | |
389 | |
140 | tw.pop_back (); |
390 | if (diff < 0) |
141 | reschedule_time_watchers (); |
391 | for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); ) |
142 | |
392 | if (*i) |
143 | w->registered = false; |
393 | (*i)->at += diff; |
144 | } |
394 | } |
145 | } |
395 | # endif |
146 | |
396 | |
147 | inline void set_now (void) |
397 | if (fds > 0) |
148 | { |
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149 | struct timeval tv; |
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150 | |
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151 | gettimeofday (&tv, 0); |
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152 | |
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153 | NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; |
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154 | } |
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155 | |
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156 | void io_manager::loop () |
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157 | { |
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158 | set_now (); |
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159 | |
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160 | for (;;) |
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161 | { |
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162 | while (tw[0]->at <= NOW) |
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163 | { |
398 | { |
164 | // remove the first watcher |
399 | # if IOM_SIG |
165 | time_watcher *w = tw[0]; |
400 | if (FD_ISSET (sigpipe[0], &rfd)) |
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401 | { |
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402 | char ch; |
166 | |
403 | |
167 | pop_heap (tw.begin (), tw.end (), earliest_first); |
404 | while (read (sigpipe[0], &ch, 1) > 0) |
168 | tw.pop_back (); |
405 | ; |
169 | |
406 | |
170 | w->registered = false; |
407 | for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); ) |
|
|
408 | if (*svp && (*svp)->pending) |
|
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409 | { |
|
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410 | sig_vec &sv = **svp; |
|
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411 | for (int i = sv.size (); i--; ) |
|
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412 | if (!sv[i]) |
|
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413 | sv.erase_unordered (i); |
|
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414 | else |
|
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415 | sv[i]->call (*sv[i]); |
171 | |
416 | |
172 | // call it |
417 | sv.pending = false; |
173 | w->call (*w); |
418 | } |
|
|
419 | } |
|
|
420 | # endif |
174 | |
421 | |
175 | // re-add it if necessary |
422 | # if IOM_IO |
176 | if (w->at >= 0 && !w->registered) |
423 | for (int i = iow.size (); i--; ) |
177 | reg (w); |
424 | if (!iow[i]) |
|
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425 | iow.erase_unordered (i); |
|
|
426 | else |
|
|
427 | { |
|
|
428 | io_watcher &w = *iow[i]; |
|
|
429 | short revents = w.events; |
|
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430 | |
|
|
431 | if (!FD_ISSET (w.fd, &rfd)) revents &= ~EVENT_READ; |
|
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432 | if (!FD_ISSET (w.fd, &wfd)) revents &= ~EVENT_WRITE; |
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433 | |
|
|
434 | if (revents) |
|
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435 | w.call (w, revents); |
|
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436 | } |
|
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437 | #endif |
178 | } |
438 | } |
|
|
439 | else if (fds < 0 && errno != EINTR) |
|
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440 | { |
|
|
441 | perror ("io_manager: fatal error while waiting for I/O or time event, aborting."); |
|
|
442 | abort (); |
|
|
443 | } |
|
|
444 | #if IOM_IDLE |
|
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445 | else |
|
|
446 | for (int i = iw.size (); i--; ) |
|
|
447 | if (!iw[i]) |
|
|
448 | iw.erase_unordered (i); |
|
|
449 | else |
|
|
450 | iw[i]->call (*iw[i]); |
|
|
451 | #endif |
179 | |
452 | |
180 | int timeout = (int) ((tw[0]->at - NOW) * 1000); |
453 | #elif IOM_TIME |
|
|
454 | if (!to) |
|
|
455 | break; |
181 | |
456 | |
182 | int fds = poll (&pfs[0], pfs.size (), timeout); |
457 | select (0, 0, 0, 0, &to); |
183 | |
|
|
184 | set_now (); |
458 | set_now (); |
185 | |
459 | #else |
186 | vector<io_watcher *>::iterator w; |
460 | break; |
187 | vector<pollfd>::iterator p; |
461 | #endif |
188 | |
|
|
189 | for (w = iow.begin (), p = pfs.begin (); |
|
|
190 | fds > 0 && w < iow.end (); |
|
|
191 | ++w, ++p) |
|
|
192 | if (p->revents) |
|
|
193 | { |
|
|
194 | --fds; |
|
|
195 | (*w)->call (**w, p->revents); |
|
|
196 | } |
|
|
197 | } |
462 | } |
198 | } |
463 | } |
199 | |
464 | |
200 | void io_manager::idle_cb (time_watcher &w) |
|
|
201 | { |
|
|
202 | w.at = NOW + 86400; // wake up every day, for no good reason |
|
|
203 | } |
|
|
204 | |
|
|
205 | io_manager::io_manager () |
|
|
206 | { |
|
|
207 | iom_valid = true; |
|
|
208 | |
|
|
209 | set_now (); |
|
|
210 | idle = new time_watcher (this, &io_manager::idle_cb); |
|
|
211 | idle->start (0); |
|
|
212 | } |
|
|
213 | |
|
|
214 | io_manager::~io_manager () |
|
|
215 | { |
|
|
216 | iom_valid = false; |
|
|
217 | } |
|
|
218 | |
|
|