2 iom.h -- generic I/O multiplexor
3 Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com>
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.
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.
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
24 // - a vector template like simplevec or stl's vector
25 // - defines for all watcher types required in your app
26 // edit iom_conf.h as appropriate.
47 typedef double tstamp;
67 template<class watcher>
68 struct io_manager_vec : vector<watcher *> {
73 void erase_unordered (unsigned int pos)
75 watcher *w = (*this)[this->size () - 1];
84 // only used as a namespace, and for initialisation purposes
86 template<class watcher>
87 static void reg (watcher &w, io_manager_vec<watcher> &queue);
89 template<class watcher>
90 static void unreg (watcher &w, io_manager_vec<watcher> &queue);
95 static void reg (io_watcher &w); static void unreg (io_watcher &w);
98 static void reg (time_watcher &w); static void unreg (time_watcher &w);
101 static void reg (check_watcher &w); static void unreg (check_watcher &w);
104 static void reg (idle_watcher &w); static void unreg (idle_watcher &w);
107 static void reg (sig_watcher &w); static void unreg (sig_watcher &w);
114 int active; /* 0 == inactive, else index into respective vector */
116 watcher () : active (0) { }
120 enum { EVENT_READ = 1, EVENT_WRITE = 2 };
122 struct io_watcher : watcher, callback2<void, io_watcher &, short> {
126 void set (int fd_, short events_) { fd = fd_; events = events_; }
128 void set (short events_) { set (fd, events_); }
129 void start () { io_manager::reg (*this); }
130 void start (int fd_, short events_) { set (fd_, events_); io_manager::reg (*this); }
131 void stop () { io_manager::unreg (*this); }
133 template<class O1, class O2>
134 io_watcher (O1 *object, void (O2::*method) (io_watcher &, short))
135 : callback2<void, io_watcher &, short> (object,method)
137 ~io_watcher () { stop (); }
142 struct time_watcher : watcher, callback1<void, time_watcher &> {
147 void set (tstamp when) { at = when; }
148 void operator () () { trigger (); }
149 void start () { io_manager::reg (*this); }
150 void start (tstamp when) { set (when); io_manager::reg (*this); }
151 void stop () { io_manager::unreg (*this); }
153 template<class O1, class O2>
154 time_watcher (O1 *object, void (O2::*method) (time_watcher &))
155 : callback1<void, time_watcher &> (object,method), at (0)
157 ~time_watcher () { stop (); }
162 // run before checking for new events
163 struct check_watcher : watcher, callback1<void, check_watcher &> {
164 void start () { io_manager::reg (*this); }
165 void stop () { io_manager::unreg (*this); }
167 template<class O1, class O2>
168 check_watcher (O1 *object, void (O2::*method) (check_watcher &))
169 : callback1<void, check_watcher &> (object,method)
171 ~check_watcher () { stop (); }
176 // run after checking for any i/o, but before waiting
177 struct idle_watcher : watcher, callback1<void, idle_watcher &> {
178 void start () { io_manager::reg (*this); }
179 void stop () { io_manager::unreg (*this); }
181 template<class O1, class O2>
182 idle_watcher (O1 *object, void (O2::*method) (idle_watcher &))
183 : callback1<void, idle_watcher &> (object,method)
185 ~idle_watcher () { stop (); }
190 struct sig_watcher : watcher, callback1<void, sig_watcher &> {
193 void start (int signum);
194 void stop () { io_manager::unreg (*this); }
196 template<class O1, class O2>
197 sig_watcher (O1 *object, void (O2::*method) (sig_watcher &))
198 : callback1<void, sig_watcher &> (object,method), signum (-1)
200 ~sig_watcher () { stop (); }