| 1 |
/* |
| 2 |
iom.C -- generic I/O multiplexor |
| 3 |
Copyright (C) 2003 Marc Lehmann <pcg@goof.com> |
| 4 |
|
| 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 |
| 7 |
the Free Software Foundation; either version 2 of the License, or |
| 8 |
(at your option) any later version. |
| 9 |
|
| 10 |
This program is distributed in the hope that it will be useful, |
| 11 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 |
GNU General Public License for more details. |
| 14 |
|
| 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 |
| 17 |
Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 |
*/ |
| 19 |
|
| 20 |
#include "../config.h" |
| 21 |
|
| 22 |
#include <cstdio> |
| 23 |
|
| 24 |
#include <sys/select.h> |
| 25 |
#include <sys/time.h> |
| 26 |
|
| 27 |
#include "iom.h" |
| 28 |
|
| 29 |
tstamp NOW; |
| 30 |
bool iom_valid; |
| 31 |
io_manager iom; |
| 32 |
|
| 33 |
void time_watcher::trigger () |
| 34 |
{ |
| 35 |
call (*this); |
| 36 |
|
| 37 |
iom.reg (this); |
| 38 |
} |
| 39 |
|
| 40 |
time_watcher::~time_watcher () |
| 41 |
{ |
| 42 |
if (iom_valid) |
| 43 |
iom.unreg (this); |
| 44 |
} |
| 45 |
|
| 46 |
io_watcher::~io_watcher () |
| 47 |
{ |
| 48 |
if (iom_valid) |
| 49 |
iom.unreg (this); |
| 50 |
} |
| 51 |
|
| 52 |
void io_manager::reg (io_watcher *w) |
| 53 |
{ |
| 54 |
if (find (iow.begin (), iow.end (), w) == iow.end ()) |
| 55 |
iow.push_back (w); |
| 56 |
} |
| 57 |
|
| 58 |
void io_manager::unreg (io_watcher *w) |
| 59 |
{ |
| 60 |
iow.erase (find (iow.begin (), iow.end (), w)); |
| 61 |
} |
| 62 |
|
| 63 |
void io_manager::reg (time_watcher *w) |
| 64 |
{ |
| 65 |
if (find (tw.begin (), tw.end (), w) == tw.end ()) |
| 66 |
tw.push_back (w); |
| 67 |
} |
| 68 |
|
| 69 |
void io_manager::unreg (time_watcher *w) |
| 70 |
{ |
| 71 |
tw.erase (find (tw.begin (), tw.end (), w)); |
| 72 |
} |
| 73 |
|
| 74 |
inline void set_now (void) |
| 75 |
{ |
| 76 |
struct timeval tv; |
| 77 |
|
| 78 |
gettimeofday (&tv, 0); |
| 79 |
|
| 80 |
NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; |
| 81 |
} |
| 82 |
|
| 83 |
void io_manager::loop () |
| 84 |
{ |
| 85 |
set_now (); |
| 86 |
|
| 87 |
for (;;) |
| 88 |
{ |
| 89 |
time_watcher *w; |
| 90 |
|
| 91 |
for (;;) |
| 92 |
{ |
| 93 |
w = tw[0]; |
| 94 |
|
| 95 |
for (time_watcher **i = tw.begin (); i != tw.end (); ++i) |
| 96 |
if ((*i)->at < w->at) |
| 97 |
w = *i; |
| 98 |
|
| 99 |
if (w->at > NOW) |
| 100 |
break; |
| 101 |
|
| 102 |
// call it |
| 103 |
w->call (*w); |
| 104 |
|
| 105 |
// re-add it if necessary |
| 106 |
if (w->at >= 0) |
| 107 |
reg (w); |
| 108 |
} |
| 109 |
|
| 110 |
struct timeval to; |
| 111 |
double diff = w->at - NOW; |
| 112 |
to.tv_sec = (int)diff; |
| 113 |
to.tv_usec = (int)((diff - to.tv_sec) * 1000000); |
| 114 |
|
| 115 |
fd_set rfd, wfd; |
| 116 |
|
| 117 |
FD_ZERO (&rfd); |
| 118 |
FD_ZERO (&wfd); |
| 119 |
|
| 120 |
int fds = 0; |
| 121 |
|
| 122 |
for (io_watcher **w = iow.begin (); w < iow.end (); ++w) |
| 123 |
{ |
| 124 |
if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); |
| 125 |
if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); |
| 126 |
|
| 127 |
if ((*w)->fd > fds) fds = (*w)->fd; |
| 128 |
} |
| 129 |
|
| 130 |
fds = select (fds + 1, &rfd, &wfd, 0, &to); |
| 131 |
|
| 132 |
set_now (); |
| 133 |
|
| 134 |
if (fds > 0) |
| 135 |
for (io_watcher **w = iow.begin (); w < iow.end (); w++) |
| 136 |
{ |
| 137 |
short revents = (*w)->events; |
| 138 |
|
| 139 |
if (!FD_ISSET ((*w)->fd, &rfd)) revents &= ~EVENT_READ; |
| 140 |
if (!FD_ISSET ((*w)->fd, &wfd)) revents &= ~EVENT_WRITE; |
| 141 |
|
| 142 |
if (revents) |
| 143 |
(*w)->call (**w, revents); |
| 144 |
} |
| 145 |
} |
| 146 |
} |
| 147 |
|
| 148 |
void io_manager::idle_cb (time_watcher &w) |
| 149 |
{ |
| 150 |
w.at = NOW + 1000000000; |
| 151 |
} |
| 152 |
|
| 153 |
io_manager::io_manager () |
| 154 |
{ |
| 155 |
set_now (); |
| 156 |
|
| 157 |
iom_valid = true; |
| 158 |
|
| 159 |
idle = new time_watcher (this, &io_manager::idle_cb); |
| 160 |
idle->start (0); |
| 161 |
} |
| 162 |
|
| 163 |
io_manager::~io_manager () |
| 164 |
{ |
| 165 |
iom_valid = false; |
| 166 |
} |
| 167 |
|
