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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 1.14 by pcg, Thu Oct 16 02:41:21 2003 UTC

1/* 1/*
2 iom.h -- I/O multiplexor 2 iom.h -- generic I/O multiplexor
3 Copyright (C) 2003 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.
… …
19#ifndef VPE_IOM_H__ 20#ifndef VPE_IOM_H__
20#define VPE_IOM_H__ 21#define VPE_IOM_H__
21 22
22#include <vector> 23#include <vector>
23 24
24#include <sys/poll.h> 25#include <cassert>
25 26
27#include "poll.h"
28
29#include "callback.h"
26#include "slog.h" 30#include "slog.h"
27 31
28typedef double tstamp; 32typedef double tstamp;
29 33
30extern tstamp NOW; 34extern tstamp NOW;
31 35
32template<class R, class A> class callback;
33struct io_watcher; 36struct io_watcher;
34struct time_watcher; 37struct time_watcher;
35 38
36class io_manager { 39class io_manager {
37 vector<pollfd> pfs; 40 vector<pollfd> pfs;
38 vector<const io_watcher *> iow; 41 vector<io_watcher *> iow;
39 vector<time_watcher *> tw; // actually a heap 42 vector<time_watcher *> tw; // actually a heap
40 43
41 void idle_cb (tstamp &ts); time_watcher *idle; 44 void idle_cb (time_watcher &w); time_watcher *idle;
42public: 45public:
43 46
44 void reschedule_time_watchers (); 47 void reschedule_time_watchers ();
45 48
46 // register a watcher 49 // register a watcher
47 void reg (int fd, short events, io_watcher *w); 50 void reg (io_watcher *w);
48 void unreg (const io_watcher *w); 51 void unreg (io_watcher *w);
49 void reg (time_watcher *w); 52 void reg (time_watcher *w);
50 void unreg (const time_watcher *w); 53 void unreg (time_watcher *w);
51 54
52 void loop (); 55 void loop ();
53 56
54 io_manager (); 57 io_manager ();
55 ~io_manager (); 58 ~io_manager ();
56}; 59};
57 60
58extern io_manager iom; 61extern io_manager iom; // a singleton, together with it's construction/destruction problems.
59 62
60template<class R, class A> 63struct io_watcher : callback2<void, io_watcher &, short> {
61class callback { 64 bool registered; // already registered?
62 struct object { }; 65 int fd;
66 short events;
63 67
64 void *obj; 68 template<class O1, class O2>
65 R (object::*meth)(A arg); 69 io_watcher (O1 *object, void (O2::*method)(io_watcher &, short))
70 : callback2<void, io_watcher &, short>(object,method)
71 , registered(false)
72 { }
66 73
67 // a proxy is a kind of recipe on how to call a specific class method 74 ~io_watcher ();
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 75
80 proxy_base *prxy; 76 void set(int fd_, short events_);
81 77
82public: 78 void set(short events_)
83 template<class O1, class O2>
84 callback (O1 *object, R (O2::*method)(A))
85 { 79 {
86 static proxy<O1,O2> p; 80 set (fd, events_);
87 obj = reinterpret_cast<void *>(object);
88 meth = reinterpret_cast<R (object::*)(A)>(method);
89 prxy = &p;
90 } 81 }
91 82
92 R call(A arg) const 83 void start (int fd_, short events_)
93 { 84 {
94 return prxy->call (obj, meth, arg); 85 set (fd_, events_);
86 iom.reg (this);
95 } 87 }
96 88
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))
106 : callback<void, short>(object,method)
107 { }
108
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 () const 89 void stop ()
120 { 90 {
121 iom.unreg (this); 91 iom.unreg (this);
122 } 92 }
123}; 93};
124 94
125#define TSTAMP_CANCEL -1. 95#define TSTAMP_CANCEL -1.
126 96
127struct time_watcher : callback<void, tstamp &> { 97struct time_watcher : callback1<void, time_watcher &> {
128 bool registered; // already registered? 98 bool registered; // already registered?
129 tstamp at; 99 tstamp at;
130 100
131 template<class O1, class O2> 101 template<class O1, class O2>
132 time_watcher (O1 *object, void (O2::*method)(tstamp &)) 102 time_watcher (O1 *object, void (O2::*method)(time_watcher &))
133 : callback<void, tstamp &>(object,method) 103 : callback1<void, time_watcher &>(object,method)
134 , registered(false) 104 , registered(false)
135 { } 105 { }
136 106
137 ~time_watcher () 107 ~time_watcher ();
138 {
139 iom.unreg (this);
140 }
141 108
142 void set (tstamp when); 109 void set (tstamp when);
143 void trigger (); 110 void trigger ();
144 111
145 void operator ()() 112 void operator ()()
146 { 113 {
147 trigger (); 114 trigger ();
148 } 115 }
149 116
150 void start (); 117 void start ()
118 {
119 iom.reg (this);
120 }
121
151 void start (tstamp when) 122 void start (tstamp when)
152 { 123 {
153 set (when); 124 set (when);
125 iom.reg (this);
154 } 126 }
155 127
156 void stop () const 128 void stop ()
157 { 129 {
158 iom.unreg (this); 130 iom.unreg (this);
159 } 131 }
160 132
161 void reset (tstamp when = TSTAMP_CANCEL) 133 void reset (tstamp when = TSTAMP_CANCEL)

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