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Comparing gvpe/src/iom.h (file contents):
Revision 1.14 by pcg, Thu Oct 16 02:41:21 2003 UTC vs.
Revision 1.27 by pcg, Thu Mar 3 16:54:34 2005 UTC

1/* 1/*
2 iom.h -- generic I/O multiplexor 2 iom.h -- generic I/O multiplexer
3 Copyright (C) 2003 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. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18*/ 20*/
19 21
20#ifndef VPE_IOM_H__ 22#ifndef IOM_H__
21#define VPE_IOM_H__ 23#define IOM_H__
22 24
23#include <vector> 25// required:
24 26// - a vector template like simplevec or stl's vector
25#include <cassert> 27// - defines for all watcher types required in your app
26 28// edit iom_conf.h as appropriate.
27#include "poll.h" 29#include "iom_conf.h"
28 30
29#include "callback.h" 31#include "callback.h"
30#include "slog.h" 32
33#ifndef IOM_IO
34# define IOM_IO 0
35#endif
36#ifndef IOM_TIME
37# define IOM_TIME 0
38#endif
39#ifndef IOM_CHECK
40# define IOM_CHECK 0
41#endif
42#ifndef IOM_IDLE
43# define IOM_IDLE 0
44#endif
45#ifndef IOM_SIG
46# define IOM_SIG 0
47#endif
31 48
32typedef double tstamp; 49typedef double tstamp;
33
34extern tstamp NOW; 50extern tstamp NOW;
35 51
52struct watcher;
53#if IOM_IO
36struct io_watcher; 54struct io_watcher;
55#endif
56#if IOM_TIME
37struct time_watcher; 57struct time_watcher;
58#endif
59#if IOM_CHECK
60struct check_watcher;
61#endif
62#if IOM_IDLE
63struct idle_watcher;
64#endif
65#if IOM_SIG
66struct sig_watcher;
67#endif
38 68
69template<class watcher>
70struct io_manager_vec : vector<watcher *> {
71 void erase_unordered (unsigned int pos)
72 {
73 watcher *w = (*this)[this->size () - 1];
74 this->pop_back ();
75
76 if (!this->empty ())
77 if (((*this)[pos] = w)) // '=' is correct!
78 w->active = pos + 1;
79 }
80};
81
82// only used as a namespace, and for initialisation purposes
39class io_manager { 83class io_manager {
40 vector<pollfd> pfs; 84 template<class watcher>
41 vector<io_watcher *> iow; 85 static void reg (watcher &w, io_manager_vec<watcher> &queue);
42 vector<time_watcher *> tw; // actually a heap
43 86
44 void idle_cb (time_watcher &w); time_watcher *idle; 87 template<class watcher>
88 static void unreg (watcher &w, io_manager_vec<watcher> &queue);
89
45public: 90public:
91#if IOM_TIME
92 // fetch time only
93 static tstamp now ();
46 94
47 void reschedule_time_watchers (); 95 // set NOW
96 static void set_now ();
97#endif
48 98
49 // register a watcher 99 // register a watcher
50 void reg (io_watcher *w); 100#if IOM_IO
51 void unreg (io_watcher *w); 101 static void reg (io_watcher &w); static void unreg (io_watcher &w);
52 void reg (time_watcher *w); 102#endif
53 void unreg (time_watcher *w); 103#if IOM_TIME
104 static void reg (time_watcher &w); static void unreg (time_watcher &w);
105#endif
106#if IOM_CHECK
107 static void reg (check_watcher &w); static void unreg (check_watcher &w);
108#endif
109#if IOM_IDLE
110 static void reg (idle_watcher &w); static void unreg (idle_watcher &w);
111#endif
112#if IOM_SIG
113 static void reg (sig_watcher &w); static void unreg (sig_watcher &w);
114#endif
54 115
55 void loop (); 116 static void loop ();
56
57 io_manager ();
58 ~io_manager ();
59}; 117};
60 118
61extern io_manager iom; // a singleton, together with it's construction/destruction problems. 119struct watcher {
120 int active; /* 0 == inactive, else index into respective vector */
62 121
122 watcher () : active (0) { }
123};
124
125#if IOM_IO
126enum { EVENT_READ = 1, EVENT_WRITE = 2 };
127
63struct io_watcher : callback2<void, io_watcher &, short> { 128struct io_watcher : watcher, callback2<void, io_watcher &, short> {
64 bool registered; // already registered?
65 int fd; 129 int fd;
66 short events; 130 short events;
67 131
132 void set (int fd_, short events_) { fd = fd_; events = events_; }
133
134 void set (short events_) { set (fd, events_); }
135 void start () { io_manager::reg (*this); }
136 void start (int fd_, short events_) { set (fd_, events_); io_manager::reg (*this); }
137 void stop () { io_manager::unreg (*this); }
138
68 template<class O1, class O2> 139 template<class O1, class O2>
69 io_watcher (O1 *object, void (O2::*method)(io_watcher &, short)) 140 io_watcher (O1 *object, void (O2::*method) (io_watcher &, short))
70 : callback2<void, io_watcher &, short>(object,method) 141 : callback2<void, io_watcher &, short> (object,method)
71 , registered(false) 142 { }
143 ~io_watcher () { stop (); }
144};
145#endif
146
147#if IOM_TIME
148struct time_watcher : watcher, callback1<void, time_watcher &> {
149 tstamp at;
150
151 void trigger ();
152
153 void set (tstamp when) { at = when; }
154 void operator () () { trigger (); }
155 void start () { io_manager::reg (*this); }
156 void start (tstamp when) { set (when); io_manager::reg (*this); }
157 void stop () { io_manager::unreg (*this); }
158
159 template<class O1, class O2>
160 time_watcher (O1 *object, void (O2::*method) (time_watcher &))
161 : callback1<void, time_watcher &> (object,method), at (0)
162 { }
163 ~time_watcher () { stop (); }
164};
165#endif
166
167#if IOM_CHECK
168// run before checking for new events
169struct check_watcher : watcher, callback1<void, check_watcher &> {
170 void start () { io_manager::reg (*this); }
171 void stop () { io_manager::unreg (*this); }
172
173 template<class O1, class O2>
174 check_watcher (O1 *object, void (O2::*method) (check_watcher &))
175 : callback1<void, check_watcher &> (object,method)
176 { }
177 ~check_watcher () { stop (); }
178};
179#endif
180
181#if IOM_IDLE
182// run after checking for any i/o, but before waiting
183struct idle_watcher : watcher, callback1<void, idle_watcher &> {
184 void start () { io_manager::reg (*this); }
185 void stop () { io_manager::unreg (*this); }
186
187 template<class O1, class O2>
188 idle_watcher (O1 *object, void (O2::*method) (idle_watcher &))
189 : callback1<void, idle_watcher &> (object,method)
72 { } 190 { }
73 191 ~idle_watcher () { stop (); }
74 ~io_watcher ();
75
76 void set(int fd_, short events_);
77
78 void set(short events_)
79 {
80 set (fd, events_);
81 }
82
83 void start (int fd_, short events_)
84 {
85 set (fd_, events_);
86 iom.reg (this);
87 }
88
89 void stop ()
90 {
91 iom.unreg (this);
92 }
93}; 192};
193#endif
94 194
95#define TSTAMP_CANCEL -1. 195#if IOM_SIG
96
97struct time_watcher : callback1<void, time_watcher &> { 196struct sig_watcher : watcher, callback1<void, sig_watcher &> {
98 bool registered; // already registered? 197 int signum;
99 tstamp at;
100 198
199 void start (int signum);
200 void stop () { io_manager::unreg (*this); }
201
101 template<class O1, class O2> 202 template<class O1, class O2>
102 time_watcher (O1 *object, void (O2::*method)(time_watcher &)) 203 sig_watcher (O1 *object, void (O2::*method) (sig_watcher &))
103 : callback1<void, time_watcher &>(object,method) 204 : callback1<void, sig_watcher &> (object,method), signum (-1)
104 , registered(false)
105 { } 205 { }
106 206 ~sig_watcher () { stop (); }
107 ~time_watcher ();
108
109 void set (tstamp when);
110 void trigger ();
111
112 void operator ()()
113 {
114 trigger ();
115 }
116
117 void start ()
118 {
119 iom.reg (this);
120 }
121
122 void start (tstamp when)
123 {
124 set (when);
125 iom.reg (this);
126 }
127
128 void stop ()
129 {
130 iom.unreg (this);
131 }
132
133 void reset (tstamp when = TSTAMP_CANCEL)
134 {
135 stop ();
136 at = when;
137 }
138}; 207};
139
140#endif 208#endif
141 209
210#endif
211

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