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Comparing gvpe/src/iom.h (file contents):
Revision 1.2 by pcg, Fri Mar 21 21:17:02 2003 UTC vs.
Revision 1.27 by pcg, Thu Mar 3 16:54:34 2005 UTC

1/* 1/*
2 iom.h -- I/O multiplexor 2 iom.h -- generic I/O multiplexer
3 Copyright (C) 2003, 2004 Marc Lehmann <gvpe@schmorp.de>
3 4
5 This file is part of GVPE.
6
4 This program is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify
5 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
6 the Free Software Foundation; either version 2 of the License, or 9 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version. 10 (at your option) any later version.
8 11
9 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,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details. 15 GNU General Public License for more details.
13 16
14 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
15 along with this program; if not, write to the Free Software 18 along with gvpe; if not, write to the Free Software
16 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
17*/ 20*/
18 21
19#ifndef VPE_IOM_H__ 22#ifndef IOM_H__
20#define VPE_IOM_H__ 23#define IOM_H__
21 24
22#include <vector> 25// required:
26// - a vector template like simplevec or stl's vector
27// - defines for all watcher types required in your app
28// edit iom_conf.h as appropriate.
29#include "iom_conf.h"
23 30
24#include <sys/poll.h> 31#include "callback.h"
25 32
26#include "slog.h" 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
27 48
28typedef double tstamp; 49typedef double tstamp;
29
30extern tstamp NOW; 50extern tstamp NOW;
31 51
32template<class R, class A> class callback; 52struct watcher;
53#if IOM_IO
33struct io_watcher; 54struct io_watcher;
55#endif
56#if IOM_TIME
34struct 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
35 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
36class io_manager { 83class io_manager {
37 vector<pollfd> pfs; 84 template<class watcher>
38 vector<io_watcher *> iow; 85 static void reg (watcher &w, io_manager_vec<watcher> &queue);
39 vector<time_watcher *> tw; // actually a heap 86
87 template<class watcher>
88 static void unreg (watcher &w, io_manager_vec<watcher> &queue);
89
40public: 90public:
91#if IOM_TIME
92 // fetch time only
93 static tstamp now ();
94
95 // set NOW
96 static void set_now ();
97#endif
41 98
42 // register a watcher 99 // register a watcher
43 void reg (int fd, short events, io_watcher *w); 100#if IOM_IO
44 void unreg (io_watcher *w); 101 static void reg (io_watcher &w); static void unreg (io_watcher &w);
45 void reg (time_watcher *w); 102#endif
46 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
47 115
48 void loop (); 116 static void loop ();
49
50 io_manager ();
51 ~io_manager ();
52}; 117};
53 118
54extern io_manager iom; 119struct watcher {
120 int active; /* 0 == inactive, else index into respective vector */
55 121
122 watcher () : active (0) { }
123};
124
125#if IOM_IO
126enum { EVENT_READ = 1, EVENT_WRITE = 2 };
127
128struct io_watcher : watcher, callback2<void, io_watcher &, short> {
129 int fd;
130 short events;
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
56template<class R, class A> 139 template<class O1, class O2>
57class callback {
58 struct object { };
59
60 void *obj;
61 R (object::*meth)(A arg);
62
63 // a proxy is a kind of recipe on how to call a specific class method
64 struct proxy_base {
65 virtual R call (void *obj, void (object::*meth)(A), A arg) = 0;
66 };
67 template<class O1, class O2>
68 struct proxy : proxy_base {
69 virtual R call (void *obj, void (object::*meth)(A), A arg)
70 {
71 ((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<void (O2::*)(A)>(meth)))
72 (arg);
73 }
74 };
75
76 proxy_base *prxy;
77
78public:
79 template<class O1, class O2>
80 callback (O1 *object, void (O2::*method)(A))
81 {
82 static proxy<O1,O2> p;
83 obj = reinterpret_cast<void *>(object);
84 meth = reinterpret_cast<void (object::*)(A)>(method);
85 prxy = &p;
86 }
87
88 R call(A arg)
89 {
90 return prxy->call (obj, meth, arg);
91 }
92
93 void stop ()
94 {
95 iom.unreg (this);
96 }
97};
98
99struct io_watcher : callback<void, short> {
100 template<class O1, class O2>
101 io_watcher (O1 *object, void (O2::*method)(short revents)) 140 io_watcher (O1 *object, void (O2::*method) (io_watcher &, short))
141 : callback2<void, io_watcher &, short> (object,method)
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 &))
102 : callback<void, short>(object,method) 189 : callback1<void, idle_watcher &> (object,method)
103 { } 190 { }
104 191 ~idle_watcher () { stop (); }
105 void start (int fd, short events)
106 {
107 iom.reg (fd, events, this);
108 }
109
110}; 192};
193#endif
111 194
112struct time_watcher : callback<void, tstamp &> { 195#if IOM_SIG
113 tstamp at; 196struct sig_watcher : watcher, callback1<void, sig_watcher &> {
197 int signum;
114 198
199 void start (int signum);
200 void stop () { io_manager::unreg (*this); }
201
115 template<class O1, class O2> 202 template<class O1, class O2>
116 time_watcher (O1 *object, void (O2::*method)(tstamp &)) 203 sig_watcher (O1 *object, void (O2::*method) (sig_watcher &))
117 : callback<void, tstamp &>(object,method) 204 : callback1<void, sig_watcher &> (object,method), signum (-1)
118 { } 205 { }
119 206 ~sig_watcher () { stop (); }
120 void set (tstamp when);
121
122 void trigger ()
123 {
124 call (at);
125 }
126
127 void start (tstamp when)
128 {
129 set (when);
130 }
131}; 207};
132
133#endif 208#endif
134 209
210#endif
211

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