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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 1.31 by pcg, Thu Jan 19 20:16:06 2006 UTC

1/* 1/*
2 iom.h -- I/O multiplexor 2 iom.h -- generic I/O multiplexer
3 Copyright (C) 2003-2006 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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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#if IOM_CHILD
32# undef IOM_SIG
33# define IOM_SIG 1
34#endif
25 35
26#include "slog.h" 36#include "callback.h"
27 37
28typedef double tstamp; 38typedef double tstamp;
29
30extern tstamp NOW; 39extern tstamp NOW;
31 40
32template<class R, class A> class callback; 41// TSTAMP_MAX must still fit into a positive struct timeval
42#define TSTAMP_MAX (double)(1UL<<31)
43
44struct watcher;
45#if IOM_IO
33struct io_watcher; 46struct io_watcher;
47#endif
48#if IOM_TIME
34struct time_watcher; 49struct time_watcher;
50#endif
51#if IOM_CHECK
52struct check_watcher;
53#endif
54#if IOM_IDLE
55struct idle_watcher;
56#endif
57#if IOM_SIG
58struct sig_watcher;
59#endif
60#if IOM_CHILD
61struct child_watcher;
62#endif
35 63
64template<class watcher>
65struct io_manager_vec : vector<watcher *> {
66 void erase_unordered (unsigned int pos)
67 {
68 watcher *w = (*this)[this->size () - 1];
69 this->pop_back ();
70
71 if (!this->empty ())
72 if (((*this)[pos] = w)) // '=' is correct!
73 w->active = pos + 1;
74 }
75};
76
77// only used as a namespace, and for initialisation purposes
36class io_manager { 78class io_manager {
37 vector<pollfd> pfs; 79 template<class watcher>
38 vector<const io_watcher *> iow; 80 static void reg (watcher &w, io_manager_vec<watcher> &queue);
39 vector<time_watcher *> tw; // actually a heap
40 81
41 void idle_cb (tstamp &ts); time_watcher *idle; 82 template<class watcher>
83 static void unreg (watcher &w, io_manager_vec<watcher> &queue);
84
42public: 85public:
86#if IOM_TIME
87 // fetch time only
88 static tstamp now ();
43 89
44 void reschedule_time_watchers (); 90 // set NOW
91 static void set_now ();
92#endif
45 93
46 // register a watcher 94 // register a watcher
47 void reg (int fd, short events, io_watcher *w); 95#if IOM_IO
48 void unreg (const io_watcher *w); 96 static void reg (io_watcher &w); static void unreg (io_watcher &w);
49 void reg (time_watcher *w); 97#endif
50 void unreg (const time_watcher *w); 98#if IOM_TIME
99 static void reg (time_watcher &w); static void unreg (time_watcher &w);
100#endif
101#if IOM_CHECK
102 static void reg (check_watcher &w); static void unreg (check_watcher &w);
103#endif
104#if IOM_IDLE
105 static void reg (idle_watcher &w); static void unreg (idle_watcher &w);
106#endif
107#if IOM_SIG
108 static void reg (sig_watcher &w); static void unreg (sig_watcher &w);
109#endif
110#if IOM_CHILD
111 static void reg (child_watcher &w); static void unreg (child_watcher &w);
112#endif
51 113
52 void loop (); 114 static void loop ();
53
54 io_manager ();
55 ~io_manager ();
56}; 115};
57 116
58extern io_manager iom; 117struct watcher {
118 int active; /* 0 == inactive, else index into respective vector */
59 119
120 bool is_active () { return active; }
121
122 watcher () : active (0) { }
123};
124
125#if IOM_IO
126enum { EVENT_UNDEF = -1, EVENT_NONE = 0, 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
60template<class R, class A> 139 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)) 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 &))
106 : callback<void, short>(object,method) 189 : callback1<void, idle_watcher &> (object, method)
107 { } 190 { }
108 191 ~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 () const
120 {
121 iom.unreg (this);
122 }
123}; 192};
193#endif
124 194
125#define TSTAMP_CANCEL -1. 195#if IOM_SIG
196struct sig_watcher : watcher, callback1<void, sig_watcher &> {
197 int signum;
126 198
127struct time_watcher : callback<void, tstamp &> { 199 void start (int signum);
128 bool registered; // already registered? 200 void stop () { io_manager::unreg (*this); }
129 tstamp at;
130 201
131 template<class O1, class O2> 202 template<class O1, class O2>
132 time_watcher (O1 *object, void (O2::*method)(tstamp &)) 203 sig_watcher (O1 *object, void (O2::*method) (sig_watcher &))
133 : callback<void, tstamp &>(object,method) 204 : callback1<void, sig_watcher &> (object, method), signum (0)
134 , registered(false)
135 { } 205 { }
206 ~sig_watcher () { stop (); }
207};
208#endif
136 209
137 ~time_watcher () 210#if IOM_CHILD
138 { 211struct child_watcher : watcher, callback2<void, child_watcher &, int> {
139 iom.unreg (this); 212 int /*pid_t*/ pid;
213
214 void start (int pid) { this->pid = pid; io_manager::reg (*this); }
215 void stop () { io_manager::unreg (*this); }
216
217 template<class O1, class O2>
218 child_watcher (O1 *object, void (O2::*method) (child_watcher &, int status))
219 : callback2<void, child_watcher &, int> (object, method), pid (0)
140 } 220 { }
141 221 ~child_watcher () { stop (); }
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 () const
157 {
158 iom.unreg (this);
159 }
160
161 void reset (tstamp when = TSTAMP_CANCEL)
162 {
163 stop ();
164 at = when;
165 }
166}; 222};
167
168#endif 223#endif
169 224
225#endif
226

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