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Comparing gvpe/src/iom.h (file contents):
Revision 1.7 by pcg, Fri Mar 28 05:40:54 2003 UTC vs.
Revision 1.17 by pcg, Thu Jan 29 23:17:39 2004 UTC

1/* 1/*
2 iom.h -- I/O multiplexor 2 iom.h -- generic I/O multiplexor
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
27 43
28typedef double tstamp; 44typedef double tstamp;
29
30extern tstamp NOW; 45extern tstamp NOW;
31 46
32template<class R, class A> class callback; 47struct watcher;
48#if IOM_IO
33struct io_watcher; 49struct io_watcher;
50#endif
51#if IOM_TIME
34struct time_watcher; 52struct time_watcher;
53#endif
54#if IOM_CHECK
55struct check_watcher;
56#endif
57#if IOM_IDLE
58struct idle_watcher;
59#endif
60
61template<class watcher>
62struct io_manager_vec : protected vector<watcher *> {
63 friend class io_manager;
64protected:
65#if IOM_CHECK
66 bool activity;
67#endif
68
69 void erase_unordered (unsigned int pos)
70 {
71 watcher *w = (*this)[size () - 1];
72 pop_back ();
73
74 if (size ())
75 if ((*this)[pos] = w)
76 w->active = pos + 1;
77 }
78};
35 79
36class io_manager { 80class io_manager {
37 vector<pollfd> pfs; 81#if IOM_IO
38 vector<const io_watcher *> iow; 82 io_manager_vec<io_watcher> iow;
39 vector<time_watcher *> tw; // actually a heap 83#endif
84#if IOM_CHECK
85 io_manager_vec<check_watcher> cw;
86#endif
87#if IOM_TIME
88 io_manager_vec<time_watcher> tw;
89#endif
90#if IOM_IDLE
91 io_manager_vec<idle_watcher> iw;
92#endif
40 93
41 void idle_cb (tstamp &ts); time_watcher *idle; 94 template<class watcher>
95 void reg (watcher *w, io_manager_vec<watcher> &queue);
96
97 template<class watcher>
98 void unreg (watcher *w, io_manager_vec<watcher> &queue);
99
42public: 100public:
43
44 void reschedule_time_watchers ();
45
46 // register a watcher 101 // register a watcher
47 void reg (int fd, short events, io_watcher *w); 102#if IOM_IO
48 void unreg (io_watcher *w); 103 void reg (io_watcher *w); void unreg (io_watcher *w);
49 void reg (time_watcher *w); 104#endif
50 void unreg (time_watcher *w); 105#if IOM_TIME
106 void reg (time_watcher *w); void unreg (time_watcher *w);
107#endif
108#if IOM_CHECK
109 void reg (check_watcher *w); void unreg (check_watcher *w);
110#endif
111#if IOM_IDLE
112 void reg (idle_watcher *w); void unreg (idle_watcher *w);
113#endif
51 114
52 void loop (); 115 void loop ();
53 116
54 io_manager (); 117 io_manager ();
55 ~io_manager (); 118 ~io_manager ();
56}; 119};
57 120
58extern io_manager iom; 121extern io_manager iom; // a singleton, together with it's construction/destruction problems.
59 122
123struct watcher {
124 int active; /* 0 == inactive, else index into respective vector */
125
126 watcher() : active(0) { }
127};
128
129#if IOM_IO
130enum { EVENT_READ = 1, EVENT_WRITE = 2 };
131
132struct io_watcher : watcher, callback2<void, io_watcher &, short> {
133 int fd;
134 short events;
135
136 void set (int fd_, short events_) { fd = fd_; events = events_; }
137
138 void set (short events_) { set (fd, events_); }
139 void start () { iom.reg (this); }
140 void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); }
141 void stop () { iom.unreg (this); }
142
60template<class R, class A> 143 template<class O1, class O2>
61class callback {
62 struct object { };
63
64 void *obj;
65 R (object::*meth)(A arg);
66
67 // a proxy is a kind of recipe on how to call a specific class method
68 struct proxy_base {
69 virtual R call (void *obj, R (object::*meth)(A), A arg) = 0;
70 };
71 template<class O1, class O2>
72 struct proxy : proxy_base {
73 virtual R call (void *obj, R (object::*meth)(A), A arg)
74 {
75 ((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<R (O2::*)(A)>(meth)))
76 (arg);
77 }
78 };
79
80 proxy_base *prxy;
81
82public:
83 template<class O1, class O2>
84 callback (O1 *object, R (O2::*method)(A))
85 {
86 static proxy<O1,O2> p;
87 obj = reinterpret_cast<void *>(object);
88 meth = reinterpret_cast<R (object::*)(A)>(method);
89 prxy = &p;
90 }
91
92 R call(A arg) const
93 {
94 return prxy->call (obj, meth, arg);
95 }
96
97 R operator ()(A arg) const
98 {
99 return call (arg);
100 }
101};
102
103struct io_watcher : callback<void, short> {
104 template<class O1, class O2>
105 io_watcher (O1 *object, void (O2::*method)(short revents)) 144 io_watcher (O1 *object, void (O2::*method)(io_watcher &, short))
145 : callback2<void, io_watcher &, short>(object,method)
146 { }
147 ~io_watcher () { stop (); }
148};
149#endif
150
151#if IOM_TIME
152struct time_watcher : watcher, callback1<void, time_watcher &> {
153 tstamp at;
154
155 void trigger ();
156
157 void set (tstamp when) { at = when; }
158 void operator ()() { trigger (); }
159 void start () { iom.reg (this); }
160 void start (tstamp when) { set (when); iom.reg (this); }
161 void stop () { iom.unreg (this); }
162
163 template<class O1, class O2>
164 time_watcher (O1 *object, void (O2::*method)(time_watcher &))
165 : callback1<void, time_watcher &>(object,method), at(0)
166 { }
167 ~time_watcher () { stop (); }
168};
169#endif
170
171#if IOM_CHECK
172// run before checking for new events
173struct check_watcher : watcher, callback1<void, check_watcher &> {
174 void start () { iom.reg (this); }
175 void stop () { iom.unreg (this); }
176
177 template<class O1, class O2>
178 check_watcher (O1 *object, void (O2::*method)(check_watcher &))
179 : callback1<void, check_watcher &>(object,method)
180 { }
181 ~check_watcher () { stop (); }
182};
183#endif
184
185#if IOM_IDLE
186// run after checking for any i/o, but before waiting
187struct idle_watcher : watcher, callback1<void, idle_watcher &> {
188 void start () { iom.reg (this); }
189 void stop () { iom.unreg (this); }
190
191 template<class O1, class O2>
192 idle_watcher (O1 *object, void (O2::*method)(idle_watcher &))
106 : callback<void, short>(object,method) 193 : callback1<void, idle_watcher &>(object,method)
107 { } 194 { }
108 195 ~idle_watcher () { stop (); }
109 ~io_watcher ()
110 {
111 iom.unreg (this);
112 }
113
114 void start (int fd, short events)
115 {
116 iom.reg (fd, events, this);
117 }
118
119 void stop ()
120 {
121 iom.unreg (this);
122 }
123}; 196};
124
125#define TSTAMP_CANCEL -1.
126
127struct time_watcher : callback<void, tstamp &> {
128 bool registered; // already registered?
129 tstamp at;
130
131 template<class O1, class O2>
132 time_watcher (O1 *object, void (O2::*method)(tstamp &))
133 : callback<void, tstamp &>(object,method)
134 , registered(false)
135 { }
136
137 ~time_watcher ()
138 {
139 iom.unreg (this);
140 }
141
142 void set (tstamp when);
143 void trigger ();
144
145 void operator ()()
146 {
147 trigger ();
148 }
149
150 void start ();
151 void start (tstamp when)
152 {
153 set (when);
154 }
155
156 void stop ()
157 {
158 iom.unreg (this);
159 }
160
161 void reset (tstamp when = TSTAMP_CANCEL)
162 {
163 stop ();
164 at = when;
165 }
166};
167
168#endif 197#endif
169 198
199#endif
200

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