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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 1.28 by pcg, Mon Mar 7 01:31:26 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
52// TSTAMP_MAX must still fit into a positive struct timeval
53#define TSTAMP_MAX (double)(1UL<<31)
54
55struct watcher;
56#if IOM_IO
36struct io_watcher; 57struct io_watcher;
58#endif
59#if IOM_TIME
37struct time_watcher; 60struct time_watcher;
61#endif
62#if IOM_CHECK
63struct check_watcher;
64#endif
65#if IOM_IDLE
66struct idle_watcher;
67#endif
68#if IOM_SIG
69struct sig_watcher;
70#endif
38 71
72template<class watcher>
73struct io_manager_vec : vector<watcher *> {
74 void erase_unordered (unsigned int pos)
75 {
76 watcher *w = (*this)[this->size () - 1];
77 this->pop_back ();
78
79 if (!this->empty ())
80 if (((*this)[pos] = w)) // '=' is correct!
81 w->active = pos + 1;
82 }
83};
84
85// only used as a namespace, and for initialisation purposes
39class io_manager { 86class io_manager {
40 vector<pollfd> pfs; 87 template<class watcher>
41 vector<io_watcher *> iow; 88 static void reg (watcher &w, io_manager_vec<watcher> &queue);
42 vector<time_watcher *> tw; // actually a heap
43 89
44 void idle_cb (time_watcher &w); time_watcher *idle; 90 template<class watcher>
91 static void unreg (watcher &w, io_manager_vec<watcher> &queue);
92
45public: 93public:
94#if IOM_TIME
95 // fetch time only
96 static tstamp now ();
46 97
47 void reschedule_time_watchers (); 98 // set NOW
99 static void set_now ();
100#endif
48 101
49 // register a watcher 102 // register a watcher
50 void reg (io_watcher *w); 103#if IOM_IO
51 void unreg (io_watcher *w); 104 static void reg (io_watcher &w); static void unreg (io_watcher &w);
52 void reg (time_watcher *w); 105#endif
53 void unreg (time_watcher *w); 106#if IOM_TIME
107 static void reg (time_watcher &w); static void unreg (time_watcher &w);
108#endif
109#if IOM_CHECK
110 static void reg (check_watcher &w); static void unreg (check_watcher &w);
111#endif
112#if IOM_IDLE
113 static void reg (idle_watcher &w); static void unreg (idle_watcher &w);
114#endif
115#if IOM_SIG
116 static void reg (sig_watcher &w); static void unreg (sig_watcher &w);
117#endif
54 118
55 void loop (); 119 static void loop ();
56
57 io_manager ();
58 ~io_manager ();
59}; 120};
60 121
61extern io_manager iom; // a singleton, together with it's construction/destruction problems. 122struct watcher {
123 int active; /* 0 == inactive, else index into respective vector */
62 124
125 watcher () : active (0) { }
126};
127
128#if IOM_IO
129enum { EVENT_READ = 1, EVENT_WRITE = 2 };
130
63struct io_watcher : callback2<void, io_watcher &, short> { 131struct io_watcher : watcher, callback2<void, io_watcher &, short> {
64 bool registered; // already registered?
65 int fd; 132 int fd;
66 short events; 133 short events;
67 134
135 void set (int fd_, short events_) { fd = fd_; events = events_; }
136
137 void set (short events_) { set (fd, events_); }
138 void start () { io_manager::reg (*this); }
139 void start (int fd_, short events_) { set (fd_, events_); io_manager::reg (*this); }
140 void stop () { io_manager::unreg (*this); }
141
68 template<class O1, class O2> 142 template<class O1, class O2>
69 io_watcher (O1 *object, void (O2::*method)(io_watcher &, short)) 143 io_watcher (O1 *object, void (O2::*method) (io_watcher &, short))
70 : callback2<void, io_watcher &, short>(object,method) 144 : callback2<void, io_watcher &, short> (object,method)
71 , registered(false) 145 { }
146 ~io_watcher () { stop (); }
147};
148#endif
149
150#if IOM_TIME
151struct time_watcher : watcher, callback1<void, time_watcher &> {
152 tstamp at;
153
154 void trigger ();
155
156 void set (tstamp when) { at = when; }
157 void operator () () { trigger (); }
158 void start () { io_manager::reg (*this); }
159 void start (tstamp when) { set (when); io_manager::reg (*this); }
160 void stop () { io_manager::unreg (*this); }
161
162 template<class O1, class O2>
163 time_watcher (O1 *object, void (O2::*method) (time_watcher &))
164 : callback1<void, time_watcher &> (object,method), at (0)
165 { }
166 ~time_watcher () { stop (); }
167};
168#endif
169
170#if IOM_CHECK
171// run before checking for new events
172struct check_watcher : watcher, callback1<void, check_watcher &> {
173 void start () { io_manager::reg (*this); }
174 void stop () { io_manager::unreg (*this); }
175
176 template<class O1, class O2>
177 check_watcher (O1 *object, void (O2::*method) (check_watcher &))
178 : callback1<void, check_watcher &> (object,method)
179 { }
180 ~check_watcher () { stop (); }
181};
182#endif
183
184#if IOM_IDLE
185// run after checking for any i/o, but before waiting
186struct idle_watcher : watcher, callback1<void, idle_watcher &> {
187 void start () { io_manager::reg (*this); }
188 void stop () { io_manager::unreg (*this); }
189
190 template<class O1, class O2>
191 idle_watcher (O1 *object, void (O2::*method) (idle_watcher &))
192 : callback1<void, idle_watcher &> (object,method)
72 { } 193 { }
73 194 ~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}; 195};
196#endif
94 197
95#define TSTAMP_CANCEL -1. 198#if IOM_SIG
96
97struct time_watcher : callback1<void, time_watcher &> { 199struct sig_watcher : watcher, callback1<void, sig_watcher &> {
98 bool registered; // already registered? 200 int signum;
99 tstamp at;
100 201
202 void start (int signum);
203 void stop () { io_manager::unreg (*this); }
204
101 template<class O1, class O2> 205 template<class O1, class O2>
102 time_watcher (O1 *object, void (O2::*method)(time_watcher &)) 206 sig_watcher (O1 *object, void (O2::*method) (sig_watcher &))
103 : callback1<void, time_watcher &>(object,method) 207 : callback1<void, sig_watcher &> (object,method), signum (-1)
104 , registered(false)
105 { } 208 { }
106 209 ~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}; 210};
139
140#endif 211#endif
141 212
213#endif
214

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