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Comparing gvpe/src/iom.h (file contents):
Revision 1.6 by pcg, Fri Mar 28 04:05:10 2003 UTC vs.
Revision 1.18 by pcg, Sun Mar 21 12:50:05 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 : vector<watcher *> {
63#if IOM_CHECK
64 bool activity;
65#endif
66
67 void erase_unordered (unsigned int pos)
68 {
69 watcher *w = (*this)[size () - 1];
70 pop_back ();
71
72 if (size ())
73 if ((*this)[pos] = w)
74 w->active = pos + 1;
75 }
76};
35 77
36class io_manager { 78class io_manager {
37 vector<pollfd> pfs; 79#if IOM_IO
38 vector<const io_watcher *> iow; 80 io_manager_vec<io_watcher> iow;
39 vector<time_watcher *> tw; // actually a heap 81#endif
82#if IOM_CHECK
83 io_manager_vec<check_watcher> cw;
84#endif
85#if IOM_TIME
86 io_manager_vec<time_watcher> tw;
87#endif
88#if IOM_IDLE
89 io_manager_vec<idle_watcher> iw;
90#endif
40 91
41 void idle_cb (tstamp &ts); time_watcher *idle; 92 template<class watcher>
93 void reg (watcher *w, io_manager_vec<watcher> &queue);
94
95 template<class watcher>
96 void unreg (watcher *w, io_manager_vec<watcher> &queue);
97
42public: 98public:
43
44 void reschedule_time_watchers ();
45
46 // register a watcher 99 // register a watcher
47 void reg (int fd, short events, io_watcher *w); 100#if IOM_IO
48 void unreg (const io_watcher *w); 101 void reg (io_watcher *w); void unreg (io_watcher *w);
49 void reg (time_watcher *w); 102#endif
50 void unreg (const time_watcher *w); 103#if IOM_TIME
104 void reg (time_watcher *w); void unreg (time_watcher *w);
105#endif
106#if IOM_CHECK
107 void reg (check_watcher *w); void unreg (check_watcher *w);
108#endif
109#if IOM_IDLE
110 void reg (idle_watcher *w); void unreg (idle_watcher *w);
111#endif
51 112
52 void loop (); 113 void loop ();
53 114
54 io_manager (); 115 io_manager ();
55 ~io_manager (); 116 ~io_manager ();
56}; 117};
57 118
58extern io_manager iom; 119extern io_manager iom; // a singleton, together with it's construction/destruction problems.
59 120
60template<class R, class A> 121struct watcher {
61class callback { 122 int active; /* 0 == inactive, else index into respective vector */
62 struct object { };
63 123
64 void *obj; 124 watcher() : active(0) { }
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}; 125};
102 126
127#if IOM_IO
128enum { EVENT_READ = 1, EVENT_WRITE = 2 };
129
103struct io_watcher : callback<void, short> { 130struct io_watcher : watcher, callback2<void, io_watcher &, short> {
131 int fd;
132 short events;
133
134 void set (int fd_, short events_) { fd = fd_; events = events_; }
135
136 void set (short events_) { set (fd, events_); }
137 void start () { iom.reg (this); }
138 void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); }
139 void stop () { iom.unreg (this); }
140
104 template<class O1, class O2> 141 template<class O1, class O2>
105 io_watcher (O1 *object, void (O2::*method)(short revents)) 142 io_watcher (O1 *object, void (O2::*method)(io_watcher &, short))
106 : callback<void, short>(object,method) 143 : callback2<void, io_watcher &, short>(object,method)
107 { } 144 { }
145 ~io_watcher () { stop (); }
146};
147#endif
108 148
109 ~io_watcher () 149#if IOM_TIME
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 () const
120 {
121 iom.unreg (this);
122 }
123};
124
125#define TSTAMP_CANCEL -1.
126
127struct time_watcher : callback<void, tstamp &> { 150struct time_watcher : watcher, callback1<void, time_watcher &> {
128 bool registered; // already registered?
129 tstamp at; 151 tstamp at;
130 152
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 (); 153 void trigger ();
144 154
145 void operator ()() 155 void set (tstamp when) { at = when; }
146 { 156 void operator ()() { trigger (); }
147 trigger (); 157 void start () { iom.reg (this); }
148 } 158 void start (tstamp when) { set (when); iom.reg (this); }
159 void stop () { iom.unreg (this); }
149 160
150 void start (); 161 template<class O1, class O2>
151 void start (tstamp when) 162 time_watcher (O1 *object, void (O2::*method)(time_watcher &))
152 { 163 : callback1<void, time_watcher &>(object,method), at(0)
153 set (when);
154 } 164 { }
165 ~time_watcher () { stop (); }
166};
167#endif
155 168
156 void stop () const 169#if IOM_CHECK
157 { 170// run before checking for new events
158 iom.unreg (this); 171struct check_watcher : watcher, callback1<void, check_watcher &> {
159 } 172 void start () { iom.reg (this); }
173 void stop () { iom.unreg (this); }
160 174
161 void reset (tstamp when = TSTAMP_CANCEL) 175 template<class O1, class O2>
162 { 176 check_watcher (O1 *object, void (O2::*method)(check_watcher &))
163 stop (); 177 : callback1<void, check_watcher &>(object,method)
164 at = when;
165 } 178 { }
179 ~check_watcher () { stop (); }
166}; 180};
181#endif
182
183#if IOM_IDLE
184// run after checking for any i/o, but before waiting
185struct idle_watcher : watcher, callback1<void, idle_watcher &> {
186 void start () { iom.reg (this); }
187 void stop () { iom.unreg (this); }
188
189 template<class O1, class O2>
190 idle_watcher (O1 *object, void (O2::*method)(idle_watcher &))
191 : callback1<void, idle_watcher &>(object,method)
192 { }
193 ~idle_watcher () { stop (); }
194};
195#endif
167 196
168#endif 197#endif
169 198

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