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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 1.24 by pcg, Fri Nov 12 10:23:33 2004 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 <pcg@goof.com>
4 4
5 This program is free software; you can redistribute it and/or modify 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 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 7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version. 8 (at your option) any later version.
… …
15 You should have received a copy of the GNU General Public License 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 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 17 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18*/ 18*/
19 19
20#ifndef VPE_IOM_H__ 20#ifndef IOM_H__
21#define VPE_IOM_H__ 21#define IOM_H__
22 22
23#include <vector> 23// required:
24 24// - a vector template like simplevec or stl's vector
25#include <cassert> 25// - defines for all watcher types required in your app
26 26// edit iom_conf.h as appropriate.
27#include "poll.h" 27#include "iom_conf.h"
28 28
29#include "callback.h" 29#include "callback.h"
30#include "slog.h" 30
31#ifndef IOM_IO
32# define IOM_IO 0
33#endif
34#ifndef IOM_TIME
35# define IOM_TIME 0
36#endif
37#ifndef IOM_CHECK
38# define IOM_CHECK 0
39#endif
40#ifndef IOM_IDLE
41# define IOM_IDLE 0
42#endif
43#ifndef IOM_SIG
44# define IOM_SIG 0
45#endif
46#ifndef IOM_ACCURACY
47# define IOM_ACCURACY 0.001 // start timers at most this much earlier (can be 0)
48#endif
31 49
32typedef double tstamp; 50typedef double tstamp;
33
34extern tstamp NOW; 51extern tstamp NOW;
35 52
53struct watcher;
54#if IOM_IO
36struct io_watcher; 55struct io_watcher;
56#endif
57#if IOM_TIME
37struct time_watcher; 58struct time_watcher;
59#endif
60#if IOM_CHECK
61struct check_watcher;
62#endif
63#if IOM_IDLE
64struct idle_watcher;
65#endif
66#if IOM_SIG
67struct sig_watcher;
68#endif
38 69
70template<class watcher>
71struct io_manager_vec : vector<watcher *> {
72 void erase_unordered (unsigned int pos)
73 {
74 watcher *w = (*this)[this->size () - 1];
75 this->pop_back ();
76
77 if (!this->empty ())
78 if (((*this)[pos] = w)) // '=' is correct!
79 w->active = pos + 1;
80 }
81};
82
83// only used as a namespace, and for initialisation purposes
39class io_manager { 84class io_manager {
40 vector<pollfd> pfs; 85 template<class watcher>
41 vector<io_watcher *> iow; 86 static void reg (watcher &w, io_manager_vec<watcher> &queue);
42 vector<time_watcher *> tw; // actually a heap
43 87
44 void idle_cb (time_watcher &w); time_watcher *idle; 88 template<class watcher>
89 static void unreg (watcher &w, io_manager_vec<watcher> &queue);
90
45public: 91public:
46
47 void reschedule_time_watchers ();
48
49 // register a watcher 92 // register a watcher
50 void reg (io_watcher *w); 93#if IOM_IO
51 void unreg (io_watcher *w); 94 static void reg (io_watcher &w); static void unreg (io_watcher &w);
52 void reg (time_watcher *w); 95#endif
53 void unreg (time_watcher *w); 96#if IOM_TIME
97 static void reg (time_watcher &w); static void unreg (time_watcher &w);
98#endif
99#if IOM_CHECK
100 static void reg (check_watcher &w); static void unreg (check_watcher &w);
101#endif
102#if IOM_IDLE
103 static void reg (idle_watcher &w); static void unreg (idle_watcher &w);
104#endif
105#if IOM_SIG
106 static void reg (sig_watcher &w); static void unreg (sig_watcher &w);
107#endif
54 108
55 void loop (); 109 static void loop ();
56
57 io_manager ();
58 ~io_manager ();
59}; 110};
60 111
61extern io_manager iom; // a singleton, together with it's construction/destruction problems. 112struct watcher {
113 int active; /* 0 == inactive, else index into respective vector */
62 114
115 watcher () : active (0) { }
116};
117
118#if IOM_IO
119enum { EVENT_READ = 1, EVENT_WRITE = 2 };
120
63struct io_watcher : callback2<void, io_watcher &, short> { 121struct io_watcher : watcher, callback2<void, io_watcher &, short> {
64 bool registered; // already registered?
65 int fd; 122 int fd;
66 short events; 123 short events;
67 124
125 void set (int fd_, short events_) { fd = fd_; events = events_; }
126
127 void set (short events_) { set (fd, events_); }
128 void start () { io_manager::reg (*this); }
129 void start (int fd_, short events_) { set (fd_, events_); io_manager::reg (*this); }
130 void stop () { io_manager::unreg (*this); }
131
68 template<class O1, class O2> 132 template<class O1, class O2>
69 io_watcher (O1 *object, void (O2::*method)(io_watcher &, short)) 133 io_watcher (O1 *object, void (O2::*method) (io_watcher &, short))
70 : callback2<void, io_watcher &, short>(object,method) 134 : callback2<void, io_watcher &, short> (object,method)
71 , registered(false) 135 { }
136 ~io_watcher () { stop (); }
137};
138#endif
139
140#if IOM_TIME
141struct time_watcher : watcher, callback1<void, time_watcher &> {
142 tstamp at;
143
144 void trigger ();
145
146 void set (tstamp when) { at = when; }
147 void operator () () { trigger (); }
148 void start () { io_manager::reg (*this); }
149 void start (tstamp when) { set (when); io_manager::reg (*this); }
150 void stop () { io_manager::unreg (*this); }
151
152 template<class O1, class O2>
153 time_watcher (O1 *object, void (O2::*method) (time_watcher &))
154 : callback1<void, time_watcher &> (object,method), at (0)
155 { }
156 ~time_watcher () { stop (); }
157};
158#endif
159
160#if IOM_CHECK
161// run before checking for new events
162struct check_watcher : watcher, callback1<void, check_watcher &> {
163 void start () { io_manager::reg (*this); }
164 void stop () { io_manager::unreg (*this); }
165
166 template<class O1, class O2>
167 check_watcher (O1 *object, void (O2::*method) (check_watcher &))
168 : callback1<void, check_watcher &> (object,method)
169 { }
170 ~check_watcher () { stop (); }
171};
172#endif
173
174#if IOM_IDLE
175// run after checking for any i/o, but before waiting
176struct idle_watcher : watcher, callback1<void, idle_watcher &> {
177 void start () { io_manager::reg (*this); }
178 void stop () { io_manager::unreg (*this); }
179
180 template<class O1, class O2>
181 idle_watcher (O1 *object, void (O2::*method) (idle_watcher &))
182 : callback1<void, idle_watcher &> (object,method)
72 { } 183 { }
73 184 ~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}; 185};
186#endif
94 187
95#define TSTAMP_CANCEL -1. 188#if IOM_SIG
96
97struct time_watcher : callback1<void, time_watcher &> { 189struct sig_watcher : watcher, callback1<void, sig_watcher &> {
98 bool registered; // already registered? 190 int signum;
99 tstamp at;
100 191
192 void start (int signum);
193 void stop () { io_manager::unreg (*this); }
194
101 template<class O1, class O2> 195 template<class O1, class O2>
102 time_watcher (O1 *object, void (O2::*method)(time_watcher &)) 196 sig_watcher (O1 *object, void (O2::*method) (sig_watcher &))
103 : callback1<void, time_watcher &>(object,method) 197 : callback1<void, sig_watcher &> (object,method), signum (-1)
104 , registered(false)
105 { } 198 { }
106 199 ~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}; 200};
139
140#endif 201#endif
141 202
203#endif
204

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