2 iom.h -- generic I/O multiplexer
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 *> {
69 void erase_unordered (unsigned int pos)
71 watcher *w = (*this)[this->size () - 1];
75 if (((*this)[pos] = w)) // '=' is correct!
80 // only used as a namespace, and for initialisation purposes
82 template<class watcher>
83 static void reg (watcher &w, io_manager_vec<watcher> &queue);
85 template<class watcher>
86 static void unreg (watcher &w, io_manager_vec<watcher> &queue);
91 static void reg (io_watcher &w); static void unreg (io_watcher &w);
94 static void reg (time_watcher &w); static void unreg (time_watcher &w);
97 static void reg (check_watcher &w); static void unreg (check_watcher &w);
100 static void reg (idle_watcher &w); static void unreg (idle_watcher &w);
103 static void reg (sig_watcher &w); static void unreg (sig_watcher &w);
110 int active; /* 0 == inactive, else index into respective vector */
112 watcher () : active (0) { }
116 enum { EVENT_READ = 1, EVENT_WRITE = 2 };
118 struct io_watcher : watcher, callback2<void, io_watcher &, short> {
122 void set (int fd_, short events_) { fd = fd_; events = events_; }
124 void set (short events_) { set (fd, events_); }
125 void start () { io_manager::reg (*this); }
126 void start (int fd_, short events_) { set (fd_, events_); io_manager::reg (*this); }
127 void stop () { io_manager::unreg (*this); }
129 template<class O1, class O2>
130 io_watcher (O1 *object, void (O2::*method) (io_watcher &, short))
131 : callback2<void, io_watcher &, short> (object,method)
133 ~io_watcher () { stop (); }
138 struct time_watcher : watcher, callback1<void, time_watcher &> {
143 void set (tstamp when) { at = when; }
144 void operator () () { trigger (); }
145 void start () { io_manager::reg (*this); }
146 void start (tstamp when) { set (when); io_manager::reg (*this); }
147 void stop () { io_manager::unreg (*this); }
149 template<class O1, class O2>
150 time_watcher (O1 *object, void (O2::*method) (time_watcher &))
151 : callback1<void, time_watcher &> (object,method), at (0)
153 ~time_watcher () { stop (); }
158 // run before checking for new events
159 struct check_watcher : watcher, callback1<void, check_watcher &> {
160 void start () { io_manager::reg (*this); }
161 void stop () { io_manager::unreg (*this); }
163 template<class O1, class O2>
164 check_watcher (O1 *object, void (O2::*method) (check_watcher &))
165 : callback1<void, check_watcher &> (object,method)
167 ~check_watcher () { stop (); }
172 // run after checking for any i/o, but before waiting
173 struct idle_watcher : watcher, callback1<void, idle_watcher &> {
174 void start () { io_manager::reg (*this); }
175 void stop () { io_manager::unreg (*this); }
177 template<class O1, class O2>
178 idle_watcher (O1 *object, void (O2::*method) (idle_watcher &))
179 : callback1<void, idle_watcher &> (object,method)
181 ~idle_watcher () { stop (); }
186 struct sig_watcher : watcher, callback1<void, sig_watcher &> {
189 void start (int signum);
190 void stop () { io_manager::unreg (*this); }
192 template<class O1, class O2>
193 sig_watcher (O1 *object, void (O2::*method) (sig_watcher &))
194 : callback1<void, sig_watcher &> (object,method), signum (-1)
196 ~sig_watcher () { stop (); }