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