1 | /* |
1 | /* |
2 | iom.C -- generic I/O multiplexor |
2 | iom.C -- generic I/O multiplexor |
3 | Copyright (C) 2003 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com> |
4 | |
4 | |
5 | 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 |
6 | 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 |
7 | the Free Software Foundation; either version 2 of the License, or |
7 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
8 | (at your option) any later version. |
… | |
… | |
15 | You should have received a copy of the GNU General Public License |
15 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, write to the Free Software |
16 | along with this program; if not, write to the Free Software |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
18 | */ |
19 | |
19 | |
20 | #include "../config.h" |
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21 | |
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22 | #include <cstdio> |
20 | #include <cstdio> |
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21 | #include <cstdlib> |
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22 | #include <cerrno> |
23 | |
23 | |
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24 | #include <sys/time.h> |
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25 | |
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26 | #if 1 // older unices need these includes for select(2) |
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27 | # include <unistd.h> |
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28 | # include <sys/types.h> |
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29 | #endif |
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30 | |
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31 | // if the BSDs would at least be marginally POSIX-compatible.. *sigh* |
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32 | // until that happens, sys/select.h must come last |
24 | #include <sys/select.h> |
33 | #include <sys/select.h> |
25 | #include <sys/time.h> |
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26 | |
34 | |
27 | #include "iom.h" |
35 | #include "iom.h" |
28 | |
36 | |
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37 | // TSTAMP_MAX must still fit into a positive struct timeval |
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38 | #define TSTAMP_MAX (double)(1UL<<31) |
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39 | |
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40 | // this is a dummy time watcher to ensure that the first |
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41 | // time watcher is _always_ valid, this gets rid of a lot |
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42 | // of null-pointer-checks |
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43 | // (must come _before_ iom is being defined) |
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44 | static struct tw0 : time_watcher |
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45 | { |
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46 | void cb (time_watcher &w) |
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47 | { |
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48 | // should never get called |
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49 | // reached end-of-time, or tstamp has a bogus definition, |
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50 | // or compiler initilization order broken, or somethine else :) |
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51 | abort (); |
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52 | } |
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53 | |
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54 | tw0() |
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55 | : time_watcher (this, &tw0::cb) |
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56 | { }} |
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57 | tw0; |
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58 | |
29 | tstamp NOW; |
59 | tstamp NOW; |
30 | bool iom_valid; |
60 | static bool iom_valid; |
31 | io_manager iom; |
61 | io_manager iom; |
32 | |
62 | |
33 | template<class watcher> |
63 | template<class watcher> |
34 | void io_manager::reg (watcher *w, simplevec<watcher *> &queue) |
64 | void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue) |
35 | { |
65 | { |
36 | if (find (queue.begin (), queue.end (), w) == queue.end ()) |
66 | if (!iom_valid) |
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67 | abort (); |
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68 | |
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69 | if (!w->active) |
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70 | { |
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71 | #if IOM_CHECK |
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72 | queue.activity = true; |
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73 | #endif |
37 | queue.push_back (w); |
74 | queue.push_back (w); |
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75 | w->active = queue.size (); |
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76 | } |
38 | } |
77 | } |
39 | |
78 | |
40 | template<class watcher> |
79 | template<class watcher> |
41 | void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) |
80 | void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue) |
42 | { |
81 | { |
43 | queue.erase (find (queue.begin (), queue.end (), w)); |
82 | if (!iom_valid) |
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83 | return; |
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84 | |
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85 | if (w->active) |
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86 | { |
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87 | queue [w->active - 1] = 0; |
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88 | w->active = 0; |
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89 | } |
44 | } |
90 | } |
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91 | |
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92 | #if IOM_TIME |
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93 | void time_watcher::trigger () |
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94 | { |
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95 | call (*this); |
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96 | |
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97 | iom.reg (this); |
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98 | } |
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99 | |
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100 | void io_manager::reg (time_watcher *w) { reg (w, tw); } |
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101 | void io_manager::unreg (time_watcher *w) { unreg (w, tw); } |
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102 | #endif |
45 | |
103 | |
46 | #if IOM_IO |
104 | #if IOM_IO |
47 | io_watcher::~io_watcher () |
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48 | { |
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49 | if (iom_valid) |
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50 | iom.unreg (this); |
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51 | } |
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52 | |
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53 | void io_manager::reg (io_watcher *w) |
105 | void io_manager::reg (io_watcher *w) { reg (w, iow); } |
54 | { |
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55 | reg (w, iow); |
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56 | } |
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57 | |
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58 | void io_manager::unreg (io_watcher *w) |
106 | void io_manager::unreg (io_watcher *w) { unreg (w, iow); } |
59 | { |
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60 | unreg (w, iow); |
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61 | } |
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62 | |
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63 | #endif |
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64 | |
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65 | #if IOM_TIME |
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66 | void time_watcher::trigger () |
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67 | { |
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68 | call (*this); |
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69 | |
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70 | iom.reg (this); |
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71 | } |
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72 | |
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73 | time_watcher::~time_watcher () |
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74 | { |
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75 | if (iom_valid) |
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76 | iom.unreg (this); |
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77 | |
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78 | at = TSTAMP_CANCEL; |
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79 | } |
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80 | |
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81 | void io_manager::reg (time_watcher *w) |
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82 | { |
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83 | reg (w, tw); |
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84 | } |
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85 | |
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86 | void io_manager::unreg (time_watcher *w) |
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87 | { |
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88 | unreg (w, tw); |
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89 | } |
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90 | #endif |
107 | #endif |
91 | |
108 | |
92 | #if IOM_CHECK |
109 | #if IOM_CHECK |
93 | check_watcher::~check_watcher () |
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94 | { |
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95 | if (iom_valid) |
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96 | iom.unreg (this); |
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97 | } |
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98 | |
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99 | void io_manager::reg (check_watcher *w) |
110 | void io_manager::reg (check_watcher *w) { reg (w, cw); } |
100 | { |
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101 | reg (w, cw); |
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102 | } |
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103 | |
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104 | void io_manager::unreg (check_watcher *w) |
111 | void io_manager::unreg (check_watcher *w) { unreg (w, cw); } |
105 | { |
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106 | unreg (w, cw); |
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107 | } |
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108 | #endif |
112 | #endif |
109 | |
113 | |
110 | #if IOM_IDLE |
114 | #if IOM_IDLE |
111 | idle_watcher::~idle_watcher () |
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112 | { |
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113 | if (iom_valid) |
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114 | iom.unreg (this); |
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115 | } |
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116 | |
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117 | void io_manager::reg (idle_watcher *w) |
115 | void io_manager::reg (idle_watcher *w) { reg (w, iw); } |
118 | { |
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119 | reg (w, iw); |
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120 | } |
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121 | |
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122 | void io_manager::unreg (idle_watcher *w) |
116 | void io_manager::unreg (idle_watcher *w) { unreg (w, iw); } |
123 | { |
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124 | unreg (w, iw); |
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125 | } |
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126 | #endif |
117 | #endif |
127 | |
118 | |
128 | #if IOM_TIME |
119 | #if IOM_TIME |
129 | inline void set_now (void) |
120 | inline void set_now (void) |
130 | { |
121 | { |
… | |
… | |
154 | tval.tv_usec = 0; |
145 | tval.tv_usec = 0; |
155 | to = &tval; |
146 | to = &tval; |
156 | } |
147 | } |
157 | else |
148 | else |
158 | #endif |
149 | #endif |
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150 | |
159 | { |
151 | { |
160 | #if IOM_TIME |
152 | #if IOM_TIME |
161 | time_watcher *w; |
153 | time_watcher *next; |
162 | |
154 | |
163 | for (;tw.size ();) |
155 | for (;;) |
164 | { |
156 | { |
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157 | next = tw[0]; // the first time-watcher must exist at ALL times |
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158 | |
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159 | for (int i = tw.size (); i--; ) |
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160 | if (!tw[i]) |
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161 | tw.erase_unordered (i); |
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162 | else if (tw[i]->at < next->at) |
165 | w = tw[0]; |
163 | next = tw[i]; |
166 | |
164 | |
167 | for (time_watcher **i = tw.begin (); i < tw.end (); ++i) |
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168 | if ((*i)->at < w->at) |
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169 | w = *i; |
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170 | |
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171 | if (w->at > NOW) |
165 | if (next->at > NOW) |
172 | { |
166 | { |
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167 | if (next != tw[0]) |
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168 | { |
173 | double diff = w->at - NOW; |
169 | double diff = next->at - NOW; |
174 | tval.tv_sec = (int)diff; |
170 | tval.tv_sec = (int)diff; |
175 | tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); |
171 | tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); |
176 | to = &tval; |
172 | to = &tval; |
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173 | } |
177 | break; |
174 | break; |
178 | } |
175 | } |
179 | else if (w->at >= 0) |
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180 | w->call (*w); |
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181 | else |
176 | else |
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177 | { |
182 | unreg (w); |
178 | unreg (next); |
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179 | next->call (*next); |
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180 | } |
183 | } |
181 | } |
184 | #endif |
182 | #endif |
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183 | |
185 | } |
184 | } |
186 | |
185 | |
187 | #if IOM_CHECK |
186 | #if IOM_CHECK |
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187 | tw.activity = false; |
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188 | |
188 | for (int i = 0; i < cw.size (); ++i) |
189 | for (int i = cw.size (); i--; ) |
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190 | if (!cw[i]) |
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191 | cw.erase_unordered (i); |
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192 | else |
189 | cw[i]->call (*cw[i]); |
193 | cw[i]->call (*cw[i]); |
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194 | |
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195 | if (tw.activity) |
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196 | { |
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197 | tval.tv_sec = 0; |
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198 | tval.tv_usec = 0; |
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199 | to = &tval; |
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200 | } |
190 | #endif |
201 | #endif |
191 | |
202 | |
192 | #if IOM_IO |
203 | #if IOM_IO |
193 | fd_set rfd, wfd; |
204 | fd_set rfd, wfd, efd; |
194 | |
205 | |
195 | FD_ZERO (&rfd); |
206 | FD_ZERO (&rfd); |
196 | FD_ZERO (&wfd); |
207 | FD_ZERO (&wfd); |
197 | |
208 | |
198 | int fds = 0; |
209 | int fds = 0; |
199 | |
210 | |
200 | for (io_watcher **w = iow.begin (); w < iow.end (); ++w) |
211 | for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); ) |
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212 | if (*i) |
201 | { |
213 | { |
202 | if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); |
214 | if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); |
203 | if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); |
215 | if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); |
204 | |
216 | |
205 | if ((*w)->fd >= fds) fds = (*w)->fd + 1; |
217 | if ((*i)->fd >= fds) fds = (*i)->fd + 1; |
206 | } |
218 | } |
207 | |
219 | |
208 | if (!to && !fds) |
220 | if (!to && !fds) //TODO: also check idle_watchers and check_watchers |
209 | break; // no events |
221 | break; // no events |
210 | |
222 | |
211 | fds = select (fds, &rfd, &wfd, 0, to); |
223 | fds = select (fds, &rfd, &wfd, &efd, to); |
212 | # if IOM_TIME |
224 | # if IOM_TIME |
213 | set_now (); |
225 | set_now (); |
214 | # endif |
226 | # endif |
215 | |
227 | |
216 | if (fds > 0) |
228 | if (fds > 0) |
217 | for (int i = 0; i < iow.size (); ++i) |
229 | for (int i = iow.size (); i--; ) |
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230 | if (!iow[i]) |
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231 | iow.erase_unordered (i); |
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232 | else |
218 | { |
233 | { |
219 | io_watcher *w = iow[i]; |
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220 | |
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221 | short revents = w->events; |
234 | short revents = iow[i]->events; |
222 | |
235 | |
223 | if (!FD_ISSET (w->fd, &rfd)) revents &= ~EVENT_READ; |
236 | if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; |
224 | if (!FD_ISSET (w->fd, &wfd)) revents &= ~EVENT_WRITE; |
237 | if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; |
225 | |
238 | |
226 | if (revents) |
239 | if (revents) |
227 | w->call (*w, revents); |
240 | iow[i]->call (*iow[i], revents); |
228 | } |
241 | } |
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242 | else if (fds < 0 && errno != EINTR) |
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243 | { |
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244 | perror ("Error while waiting for I/O or time event"); |
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245 | abort (); |
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246 | } |
229 | #if IOM_IDLE |
247 | #if IOM_IDLE |
230 | else if (iw.size ()) |
248 | else |
231 | for (int i = 0; i < iw.size (); ++i) |
249 | for (int i = iw.size (); i--; ) |
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250 | if (!iw[i]) |
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251 | iw.erase_unordered (i); |
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252 | else |
232 | iw[i]->call (*iw[i]); |
253 | iw[i]->call (*iw[i]); |
233 | #endif |
254 | #endif |
234 | |
255 | |
235 | #elif IOM_TIME |
256 | #elif IOM_TIME |
236 | if (!to) |
257 | if (!to) |
237 | break; |
258 | break; |
… | |
… | |
239 | select (0, 0, 0, 0, &to); |
260 | select (0, 0, 0, 0, &to); |
240 | set_now (); |
261 | set_now (); |
241 | #else |
262 | #else |
242 | break; |
263 | break; |
243 | #endif |
264 | #endif |
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265 | |
244 | } |
266 | } |
245 | } |
267 | } |
246 | |
268 | |
247 | io_manager::io_manager () |
269 | io_manager::io_manager () |
248 | { |
270 | { |
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271 | iom_valid = true; |
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272 | |
249 | #if IOM_TIME |
273 | #if IOM_TIME |
250 | set_now (); |
274 | set_now (); |
251 | #endif |
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252 | |
275 | |
253 | iom_valid = true; |
276 | tw0.start (TSTAMP_MAX); |
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277 | #endif |
254 | } |
278 | } |
255 | |
279 | |
256 | io_manager::~io_manager () |
280 | io_manager::~io_manager () |
257 | { |
281 | { |
258 | iom_valid = false; |
282 | iom_valid = false; |