ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/gvpe/src/iom.h
(Generate patch)

Comparing gvpe/src/iom.h (file contents):
Revision 1.2 by pcg, Fri Mar 21 21:17:02 2003 UTC vs.
Revision 1.25 by pcg, Fri Nov 12 12:49:12 2004 UTC

1/* 1/*
2 iom.h -- I/O multiplexor 2 iom.h -- generic I/O multiplexer
3 Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com>
3 4
4 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
5 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
6 the Free Software Foundation; either version 2 of the License, or 7 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version. 8 (at your option) any later version.
… …
14 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
15 along with this program; if not, write to the Free Software 16 along with this program; if not, write to the Free Software
16 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
17*/ 18*/
18 19
19#ifndef VPE_IOM_H__ 20#ifndef IOM_H__
20#define VPE_IOM_H__ 21#define IOM_H__
21 22
22#include <vector> 23// required:
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.
27#include "iom_conf.h"
23 28
24#include <sys/poll.h> 29#include "callback.h"
25 30
26#include "slog.h" 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
27 46
28typedef double tstamp; 47typedef double tstamp;
29
30extern tstamp NOW; 48extern tstamp NOW;
31 49
32template<class R, class A> class callback; 50struct watcher;
51#if IOM_IO
33struct io_watcher; 52struct io_watcher;
53#endif
54#if IOM_TIME
34struct time_watcher; 55struct time_watcher;
56#endif
57#if IOM_CHECK
58struct check_watcher;
59#endif
60#if IOM_IDLE
61struct idle_watcher;
62#endif
63#if IOM_SIG
64struct sig_watcher;
65#endif
35 66
67template<class watcher>
68struct io_manager_vec : vector<watcher *> {
69 void erase_unordered (unsigned int pos)
70 {
71 watcher *w = (*this)[this->size () - 1];
72 this->pop_back ();
73
74 if (!this->empty ())
75 if (((*this)[pos] = w)) // '=' is correct!
76 w->active = pos + 1;
77 }
78};
79
80// only used as a namespace, and for initialisation purposes
36class io_manager { 81class io_manager {
37 vector<pollfd> pfs; 82 template<class watcher>
38 vector<io_watcher *> iow; 83 static void reg (watcher &w, io_manager_vec<watcher> &queue);
39 vector<time_watcher *> tw; // actually a heap 84
85 template<class watcher>
86 static void unreg (watcher &w, io_manager_vec<watcher> &queue);
87
40public: 88public:
41
42 // register a watcher 89 // register a watcher
43 void reg (int fd, short events, io_watcher *w); 90#if IOM_IO
44 void unreg (io_watcher *w); 91 static void reg (io_watcher &w); static void unreg (io_watcher &w);
45 void reg (time_watcher *w); 92#endif
46 void unreg (time_watcher *w); 93#if IOM_TIME
94 static void reg (time_watcher &w); static void unreg (time_watcher &w);
95#endif
96#if IOM_CHECK
97 static void reg (check_watcher &w); static void unreg (check_watcher &w);
98#endif
99#if IOM_IDLE
100 static void reg (idle_watcher &w); static void unreg (idle_watcher &w);
101#endif
102#if IOM_SIG
103 static void reg (sig_watcher &w); static void unreg (sig_watcher &w);
104#endif
47 105
48 void loop (); 106 static void loop ();
49
50 io_manager ();
51 ~io_manager ();
52}; 107};
53 108
54extern io_manager iom; 109struct watcher {
110 int active; /* 0 == inactive, else index into respective vector */
55 111
112 watcher () : active (0) { }
113};
114
115#if IOM_IO
116enum { EVENT_READ = 1, EVENT_WRITE = 2 };
117
118struct io_watcher : watcher, callback2<void, io_watcher &, short> {
119 int fd;
120 short events;
121
122 void set (int fd_, short events_) { fd = fd_; events = events_; }
123
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); }
128
56template<class R, class A> 129 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)) 130 io_watcher (O1 *object, void (O2::*method) (io_watcher &, short))
131 : callback2<void, io_watcher &, short> (object,method)
132 { }
133 ~io_watcher () { stop (); }
134};
135#endif
136
137#if IOM_TIME
138struct time_watcher : watcher, callback1<void, time_watcher &> {
139 tstamp at;
140
141 void trigger ();
142
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); }
148
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)
152 { }
153 ~time_watcher () { stop (); }
154};
155#endif
156
157#if IOM_CHECK
158// run before checking for new events
159struct check_watcher : watcher, callback1<void, check_watcher &> {
160 void start () { io_manager::reg (*this); }
161 void stop () { io_manager::unreg (*this); }
162
163 template<class O1, class O2>
164 check_watcher (O1 *object, void (O2::*method) (check_watcher &))
165 : callback1<void, check_watcher &> (object,method)
166 { }
167 ~check_watcher () { stop (); }
168};
169#endif
170
171#if IOM_IDLE
172// run after checking for any i/o, but before waiting
173struct idle_watcher : watcher, callback1<void, idle_watcher &> {
174 void start () { io_manager::reg (*this); }
175 void stop () { io_manager::unreg (*this); }
176
177 template<class O1, class O2>
178 idle_watcher (O1 *object, void (O2::*method) (idle_watcher &))
102 : callback<void, short>(object,method) 179 : callback1<void, idle_watcher &> (object,method)
103 { } 180 { }
104 181 ~idle_watcher () { stop (); }
105 void start (int fd, short events)
106 {
107 iom.reg (fd, events, this);
108 }
109
110}; 182};
183#endif
111 184
112struct time_watcher : callback<void, tstamp &> { 185#if IOM_SIG
113 tstamp at; 186struct sig_watcher : watcher, callback1<void, sig_watcher &> {
187 int signum;
114 188
189 void start (int signum);
190 void stop () { io_manager::unreg (*this); }
191
115 template<class O1, class O2> 192 template<class O1, class O2>
116 time_watcher (O1 *object, void (O2::*method)(tstamp &)) 193 sig_watcher (O1 *object, void (O2::*method) (sig_watcher &))
117 : callback<void, tstamp &>(object,method) 194 : callback1<void, sig_watcher &> (object,method), signum (-1)
118 { } 195 { }
119 196 ~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}; 197};
132
133#endif 198#endif
134 199
200#endif
201

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines