1 | /* |
1 | /* |
2 | iom.C -- generic I/O multiplexer |
2 | iom.C -- generic I/O multiplexer |
3 | Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003, 2004 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
|
|
5 | This file is part of GVPE. |
|
|
6 | |
5 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
6 | 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 |
7 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
10 | (at your option) any later version. |
9 | |
11 | |
10 | 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, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
14 | |
16 | |
15 | 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 |
16 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
17 | 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 |
18 | */ |
20 | */ |
19 | |
21 | |
20 | #include "iom.h" |
22 | #include "iom.h" |
21 | |
23 | |
22 | #include <cstdio> |
24 | #include <cstdio> |
… | |
… | |
33 | # include <time.h> |
35 | # include <time.h> |
34 | #endif |
36 | #endif |
35 | |
37 | |
36 | // for IOM_SIG |
38 | // for IOM_SIG |
37 | #if IOM_SIG |
39 | #if IOM_SIG |
38 | # include <signal.h> |
40 | # include <csignal> |
39 | # include <fcntl.h> |
41 | # include <fcntl.h> |
40 | #endif |
42 | #endif |
41 | |
43 | |
42 | // if the BSDs would at least be marginally POSIX-compatible.. *sigh* |
44 | // if the BSDs would at least be marginally POSIX-compatible.. *sigh* |
43 | // until that happens, sys/select.h must come last |
45 | // until that happens, sys/select.h must come last |
44 | #include <sys/select.h> |
46 | #include <sys/select.h> |
45 | |
|
|
46 | // TSTAMP_MAX must still fit into a positive struct timeval |
|
|
47 | #define TSTAMP_MAX (double)(1UL<<31) |
|
|
48 | |
47 | |
49 | #define TIMEVAL timeval |
48 | #define TIMEVAL timeval |
50 | #define TV_FRAC tv_usec |
49 | #define TV_FRAC tv_usec |
51 | #define TV_MULT 1000000L |
50 | #define TV_MULT 1000000L |
52 | |
51 | |
… | |
… | |
94 | } tw0; |
93 | } tw0; |
95 | |
94 | |
96 | tstamp NOW; |
95 | tstamp NOW; |
97 | |
96 | |
98 | #if IOM_TIME |
97 | #if IOM_TIME |
99 | inline void set_now (void) |
98 | tstamp io_manager::now () |
100 | { |
99 | { |
101 | struct timeval tv; |
100 | struct timeval tv; |
102 | |
101 | |
103 | gettimeofday (&tv, 0); |
102 | gettimeofday (&tv, 0); |
104 | NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000.; |
103 | return (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000.; |
|
|
104 | } |
|
|
105 | |
|
|
106 | void io_manager::set_now () |
|
|
107 | { |
|
|
108 | NOW = now (); |
105 | } |
109 | } |
106 | #endif |
110 | #endif |
107 | |
111 | |
108 | static bool iom_valid; |
112 | static bool iom_valid; |
109 | |
113 | |
… | |
… | |
118 | { |
122 | { |
119 | perror ("io_manager: unable to create signal pipe, aborting."); |
123 | perror ("io_manager: unable to create signal pipe, aborting."); |
120 | abort (); |
124 | abort (); |
121 | } |
125 | } |
122 | |
126 | |
123 | fcntl (sigpipe[0], F_SETFL, O_NONBLOCK); |
127 | fcntl (sigpipe[0], F_SETFL, O_NONBLOCK); fcntl (sigpipe[0], F_SETFD, FD_CLOEXEC); |
124 | fcntl (sigpipe[1], F_SETFL, O_NONBLOCK); |
128 | fcntl (sigpipe[1], F_SETFL, O_NONBLOCK); fcntl (sigpipe[1], F_SETFD, FD_CLOEXEC); |
125 | #endif |
129 | #endif |
126 | |
130 | |
127 | iom_valid = true; |
131 | iom_valid = true; |
128 | |
132 | |
129 | #if IOM_TIME |
133 | #if IOM_TIME |
130 | set_now (); |
134 | io_manager::set_now (); |
131 | |
135 | |
132 | tw0.start (TSTAMP_MAX); |
136 | tw0.start (TSTAMP_MAX); |
133 | #endif |
137 | #endif |
|
|
138 | } |
|
|
139 | |
|
|
140 | ~init () |
|
|
141 | { |
|
|
142 | iom_valid = false; |
134 | } |
143 | } |
135 | |
144 | |
136 | static void required (); |
145 | static void required (); |
137 | } init; |
146 | } init; |
138 | |
147 | |
… | |
… | |
375 | # if IOM_SIG |
384 | # if IOM_SIG |
376 | sigprocmask (SIG_BLOCK, &sigs, NULL); |
385 | sigprocmask (SIG_BLOCK, &sigs, NULL); |
377 | # endif |
386 | # endif |
378 | |
387 | |
379 | # if IOM_TIME |
388 | # if IOM_TIME |
|
|
389 | { |
|
|
390 | // update time, try to compensate for gross non-monotonic time changes |
|
|
391 | tstamp diff = NOW; |
380 | set_now (); |
392 | set_now (); |
|
|
393 | diff = NOW - diff; |
|
|
394 | |
|
|
395 | if (diff < 0) |
|
|
396 | for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); ) |
|
|
397 | if (*i) |
|
|
398 | (*i)->at += diff; |
|
|
399 | } |
381 | # endif |
400 | # endif |
382 | |
401 | |
383 | if (fds > 0) |
402 | if (fds > 0) |
384 | { |
403 | { |
385 | # if IOM_SIG |
404 | # if IOM_SIG |
… | |
… | |
409 | for (int i = iow.size (); i--; ) |
428 | for (int i = iow.size (); i--; ) |
410 | if (!iow[i]) |
429 | if (!iow[i]) |
411 | iow.erase_unordered (i); |
430 | iow.erase_unordered (i); |
412 | else |
431 | else |
413 | { |
432 | { |
|
|
433 | io_watcher &w = *iow[i]; |
414 | short revents = iow[i]->events; |
434 | short revents = w.events; |
415 | |
435 | |
416 | if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; |
436 | if (!FD_ISSET (w.fd, &rfd)) revents &= ~EVENT_READ; |
417 | if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; |
437 | if (!FD_ISSET (w.fd, &wfd)) revents &= ~EVENT_WRITE; |
418 | |
438 | |
419 | if (revents) |
439 | if (revents) |
420 | iow[i]->call (*iow[i], revents); |
440 | w.call (w, revents); |
421 | } |
441 | } |
422 | #endif |
442 | #endif |
423 | } |
443 | } |
424 | else if (fds < 0 && errno != EINTR) |
444 | else if (fds < 0 && errno != EINTR) |
425 | { |
445 | { |