gvpe/src/iom.h

/*
    iom.h -- generic I/O multiplexor
    Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef IOM_H__
#define IOM_H__

// required:
// - a vector template like simplevec or stl's vector
// - defines for all watcher types required in your app
// edit iom_conf.h as appropriate.
#include "iom_conf.h"

#include "callback.h"

#ifndef IOM_IO
# define IOM_IO 0
#endif
#ifndef IOM_TIME
# define IOM_TIME 0
#endif
#ifndef IOM_CHECK
# define IOM_CHECK 0
#endif
#ifndef IOM_IDLE
# define IOM_IDLE 0
#endif

typedef double tstamp;
extern tstamp NOW;

struct watcher;
#if IOM_IO
struct io_watcher;
#endif
#if IOM_TIME
struct time_watcher;
#endif
#if IOM_CHECK
struct check_watcher;
#endif
#if IOM_IDLE
struct idle_watcher;
#endif

template<class watcher>
struct io_manager_vec : protected vector<watcher *> {
  friend class io_manager;
protected:
  void erase_unordered (unsigned int pos)
  {
    watcher *w = (*this)[size () - 1];
    pop_back ();

    if (size ())
      if ((*this)[pos] = w)
        w->active = pos + 1;
  }
};

class io_manager {
#if IOM_IO
  io_manager_vec<io_watcher>    iow;
#endif
#if IOM_CHECK
  io_manager_vec<check_watcher> cw;
#endif
#if IOM_TIME
  io_manager_vec<time_watcher>  tw;
#endif
#if IOM_IDLE
  io_manager_vec<idle_watcher>  iw;
#endif

  template<class watcher>
  void reg (watcher *w, io_manager_vec<watcher> &queue);

  template<class watcher>
  void unreg (watcher *w, io_manager_vec<watcher> &queue);

public:
  // register a watcher
#if IOM_IO
  void reg (io_watcher    *w); void unreg (io_watcher    *w);
#endif
#if IOM_TIME
  void reg (time_watcher  *w); void unreg (time_watcher  *w);
#endif
#if IOM_CHECK
  void reg (check_watcher *w); void unreg (check_watcher *w);
#endif
#if IOM_IDLE
  void reg (idle_watcher  *w); void unreg (idle_watcher  *w);
#endif
  
  void loop ();

  io_manager ();
  ~io_manager ();
};

extern io_manager iom; // a singleton, together with it's construction/destruction problems.

struct watcher {
  int active; /* 0 == inactive, else index into respective vector */

  watcher() : active(0) { }
};

#if IOM_IO
enum { EVENT_READ = 1, EVENT_WRITE = 2 };

struct io_watcher : watcher, callback2<void, io_watcher &, short> {
  int fd;
  short events;

  void set (int fd_, short events_) { fd = fd_; events = events_; }

  void set (short events_) { set (fd, events_); }
  void start () { iom.reg (this); }
  void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); }
  void stop () { iom.unreg (this); }

  template<class O1, class O2>
  io_watcher (O1 *object, void (O2::*method)(io_watcher &, short))
  : callback2<void, io_watcher &, short>(object,method)
  { }
  ~io_watcher () { stop (); }
};
#endif

#if IOM_TIME
struct time_watcher : watcher, callback1<void, time_watcher &> {
  tstamp at;

  void trigger ();

  void set (tstamp when) { at = when; }
  void operator ()() { trigger (); }
  void start () { iom.reg (this); }
  void start (tstamp when) { set (when); iom.reg (this); }
  void stop () { iom.unreg (this); }

  template<class O1, class O2>
  time_watcher (O1 *object, void (O2::*method)(time_watcher &))
  : callback1<void, time_watcher &>(object,method)
  { }
  ~time_watcher () { stop (); }
};
#endif

#if IOM_CHECK
// run before checking for new events
struct check_watcher : watcher, callback1<void, check_watcher &> {
  void start () { iom.reg (this); }
  void stop () { iom.unreg (this); }

  template<class O1, class O2>
  check_watcher (O1 *object, void (O2::*method)(check_watcher &))
  : callback1<void, check_watcher &>(object,method)
  { }
  ~check_watcher () { stop (); }
};
#endif

#if IOM_IDLE
// run after checking for any i/o, but before waiting
struct idle_watcher : watcher, callback1<void, idle_watcher &> {
  void start () { iom.reg (this); }
  void stop () { iom.unreg (this); }

  template<class O1, class O2>
  idle_watcher (O1 *object, void (O2::*method)(idle_watcher &))
    : callback1<void, idle_watcher &>(object,method)
    { }
  ~idle_watcher () { stop (); }
};
#endif

#endif

Revision:	1.15
Committed:	Sat Jan 17 01:18:36 2004 UTC (22 years, 8 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.14:	+135 -80 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2	pcg	1.14	iom.h -- generic I/O multiplexor
3	pcg	1.15	Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com>
4	pcg	1.1
5			This program is free software; you can redistribute it and/or modify
6			it under the terms of the GNU General Public License as published by
7			the Free Software Foundation; either version 2 of the License, or
8			(at your option) any later version.
9
10			This program is distributed in the hope that it will be useful,
11			but WITHOUT ANY WARRANTY; without even the implied warranty of
12			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13			GNU General Public License for more details.
14
15			You should have received a copy of the GNU General Public License
16			along with this program; if not, write to the Free Software
17			Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18			*/
19
20	pcg	1.15	#ifndef IOM_H__
21			#define IOM_H__
22	pcg	1.1
23	pcg	1.15	// 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"
28	pcg	1.1
29	pcg	1.15	#include "callback.h"
30	pcg	1.1
31	pcg	1.15	#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	pcg	1.1
44	pcg	1.2	typedef double tstamp;
45			extern tstamp NOW;
46	pcg	1.1
47	pcg	1.15	struct watcher;
48			#if IOM_IO
49	pcg	1.1	struct io_watcher;
50	pcg	1.15	#endif
51			#if IOM_TIME
52	pcg	1.1	struct time_watcher;
53	pcg	1.15	#endif
54			#if IOM_CHECK
55			struct check_watcher;
56			#endif
57			#if IOM_IDLE
58			struct idle_watcher;
59			#endif
60
61			template<class watcher>
62			struct io_manager_vec : protected vector<watcher *> {
63			friend class io_manager;
64			protected:
65			void erase_unordered (unsigned int pos)
66			{
67			watcher w = (this)[size () - 1];
68			pop_back ();
69
70			if (size ())
71			if ((*this)[pos] = w)
72			w->active = pos + 1;
73			}
74			};
75	pcg	1.1
76			class io_manager {
77	pcg	1.15	#if IOM_IO
78			io_manager_vec<io_watcher> iow;
79			#endif
80			#if IOM_CHECK
81			io_manager_vec<check_watcher> cw;
82			#endif
83			#if IOM_TIME
84			io_manager_vec<time_watcher> tw;
85			#endif
86			#if IOM_IDLE
87			io_manager_vec<idle_watcher> iw;
88			#endif
89	pcg	1.4
90	pcg	1.15	template<class watcher>
91			void reg (watcher *w, io_manager_vec<watcher> &queue);
92	pcg	1.1
93	pcg	1.15	template<class watcher>
94			void unreg (watcher *w, io_manager_vec<watcher> &queue);
95	pcg	1.6
96	pcg	1.15	public:
97	pcg	1.1	// register a watcher
98	pcg	1.15	#if IOM_IO
99			void reg (io_watcher w); void unreg (io_watcher w);
100			#endif
101			#if IOM_TIME
102			void reg (time_watcher w); void unreg (time_watcher w);
103			#endif
104			#if IOM_CHECK
105			void reg (check_watcher w); void unreg (check_watcher w);
106			#endif
107			#if IOM_IDLE
108			void reg (idle_watcher w); void unreg (idle_watcher w);
109			#endif
110	pcg	1.1
111			void loop ();
112
113			io_manager ();
114			~io_manager ();
115			};
116
117	pcg	1.11	extern io_manager iom; // a singleton, together with it's construction/destruction problems.
118	pcg	1.1
119	pcg	1.15	struct watcher {
120			int active; /* 0 == inactive, else index into respective vector */
121
122			watcher() : active(0) { }
123			};
124
125			#if IOM_IO
126			enum { EVENT_READ = 1, EVENT_WRITE = 2 };
127
128			struct io_watcher : watcher, callback2<void, io_watcher &, short> {
129	pcg	1.12	int fd;
130			short events;
131	pcg	1.10
132	pcg	1.15	void set (int fd_, short events_) { fd = fd_; events = events_; }
133
134			void set (short events_) { set (fd, events_); }
135			void start () { iom.reg (this); }
136			void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); }
137			void stop () { iom.unreg (this); }
138
139	pcg	1.1	template<class O1, class O2>
140	pcg	1.10	io_watcher (O1 object, void (O2::method)(io_watcher &, short))
141	pcg	1.15	: callback2<void, io_watcher &, short>(object,method)
142			{ }
143			~io_watcher () { stop (); }
144			};
145			#endif
146
147			#if IOM_TIME
148			struct time_watcher : watcher, callback1<void, time_watcher &> {
149			tstamp at;
150	pcg	1.2
151	pcg	1.15	void trigger ();
152	pcg	1.11
153	pcg	1.15	void set (tstamp when) { at = when; }
154			void operator ()() { trigger (); }
155			void start () { iom.reg (this); }
156			void start (tstamp when) { set (when); iom.reg (this); }
157			void stop () { iom.unreg (this); }
158	pcg	1.6
159	pcg	1.15	template<class O1, class O2>
160			time_watcher (O1 object, void (O2::method)(time_watcher &))
161			: callback1<void, time_watcher &>(object,method)
162			{ }
163			~time_watcher () { stop (); }
164			};
165			#endif
166	pcg	1.11
167	pcg	1.15	#if IOM_CHECK
168			// run before checking for new events
169			struct check_watcher : watcher, callback1<void, check_watcher &> {
170			void start () { iom.reg (this); }
171			void stop () { iom.unreg (this); }
172	pcg	1.1
173	pcg	1.15	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	pcg	1.1	};
179	pcg	1.15	#endif
180	pcg	1.1
181	pcg	1.15	#if IOM_IDLE
182			// run after checking for any i/o, but before waiting
183			struct idle_watcher : watcher, callback1<void, idle_watcher &> {
184			void start () { iom.reg (this); }
185			void stop () { iom.unreg (this); }
186	pcg	1.2
187			template<class O1, class O2>
188	pcg	1.15	idle_watcher (O1 object, void (O2::method)(idle_watcher &))
189			: callback1<void, idle_watcher &>(object,method)
190	pcg	1.2	{ }
191	pcg	1.15	~idle_watcher () { stop (); }
192	pcg	1.1	};
193	pcg	1.15	#endif
194	pcg	1.1
195			#endif
196