gvpe/src/iom.h

/*
    iom.h -- I/O multiplexor
 
    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 VPE_IOM_H__
#define VPE_IOM_H__

#include <vector>

#include <cassert>

#include <sys/poll.h>

#include "callback.h"
#include "slog.h"

typedef double tstamp;

extern tstamp NOW;

struct io_watcher;
struct time_watcher;

class io_manager {
  vector<pollfd> pfs;
  vector<io_watcher *> iow;
  vector<time_watcher *> tw; // actually a heap

  void idle_cb (time_watcher &w); time_watcher *idle;
public:

  void reschedule_time_watchers ();

  // register a watcher
  void reg (io_watcher *w);
  void unreg (io_watcher *w);
  void reg (time_watcher *w);
  void unreg (time_watcher *w);
  
  void loop ();

  io_manager ();
  ~io_manager ();
};

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

struct io_watcher : callback2<void, io_watcher &, short> {
  pollfd *p;

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

  ~io_watcher ();

  void set(int fd, short events)
    {
      assert (p);
      p->fd     = fd;
      p->events = events;
    }

  void set(short events)
    {
      assert (p);
      p->events = events;
    }

  void start (int fd, short events)
    {
      iom.reg (this); // make sure pfd is set

      p->fd     = fd;
      p->events = events;
    }

  void stop ()
    {
      iom.unreg (this);
    }
};

#define TSTAMP_CANCEL -1.

struct time_watcher : callback1<void, time_watcher &> {
  bool registered; // already registered?
  tstamp at;

  template<class O1, class O2>
  time_watcher (O1 *object, void (O2::*method)(time_watcher &))
    : callback1<void, time_watcher &>(object,method)
    , registered(false)
    { }

  ~time_watcher ();

  void set (tstamp when);
  void trigger ();

  void operator ()()
    {
      trigger ();
    }

  void start ();
  void start (tstamp when)
    {
      set (when);
    }

  void stop ()
    {
      iom.unreg (this);
    }

  void reset (tstamp when = TSTAMP_CANCEL)
    {
      stop ();

      at = when;
    }
};

#endif

Revision:	1.11
Committed:	Fri Apr 4 05:26:45 2003 UTC (21 years, 1 month ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.10:	+23 -13 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			iom.h -- I/O multiplexor
3
4			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			the Free Software Foundation; either version 2 of the License, or
7			(at your option) any later version.
8
9			This program is distributed in the hope that it will be useful,
10			but WITHOUT ANY WARRANTY; without even the implied warranty of
11			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12			GNU General Public License for more details.
13
14			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			Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17			*/
18
19			#ifndef VPE_IOM_H__
20			#define VPE_IOM_H__
21
22			#include <vector>
23
24	pcg	1.11	#include <cassert>
25
26	pcg	1.1	#include <sys/poll.h>
27
28	pcg	1.8	#include "callback.h"
29	pcg	1.1	#include "slog.h"
30
31	pcg	1.2	typedef double tstamp;
32	pcg	1.1
33	pcg	1.2	extern tstamp NOW;
34	pcg	1.1
35			struct io_watcher;
36			struct time_watcher;
37
38			class io_manager {
39			vector<pollfd> pfs;
40	pcg	1.10	vector<io_watcher *> iow;
41	pcg	1.1	vector<time_watcher *> tw; // actually a heap
42	pcg	1.4
43	pcg	1.10	void idle_cb (time_watcher &w); time_watcher *idle;
44	pcg	1.1	public:
45
46	pcg	1.6	void reschedule_time_watchers ();
47
48	pcg	1.1	// register a watcher
49	pcg	1.10	void reg (io_watcher *w);
50	pcg	1.7	void unreg (io_watcher *w);
51	pcg	1.1	void reg (time_watcher *w);
52	pcg	1.7	void unreg (time_watcher *w);
53	pcg	1.1
54			void loop ();
55
56			io_manager ();
57			~io_manager ();
58			};
59
60	pcg	1.11	extern io_manager iom; // a singleton, together with it's construction/destruction problems.
61	pcg	1.1
62	pcg	1.10	struct io_watcher : callback2<void, io_watcher &, short> {
63	pcg	1.11	pollfd *p;
64	pcg	1.10
65	pcg	1.1	template<class O1, class O2>
66	pcg	1.10	io_watcher (O1 object, void (O2::method)(io_watcher &, short))
67			: callback2<void, io_watcher &, short>(object,method)
68	pcg	1.2	{ }
69
70	pcg	1.11	~io_watcher ();
71
72			void set(int fd, short events)
73	pcg	1.6	{
74	pcg	1.11	assert (p);
75			p->fd = fd;
76			p->events = events;
77	pcg	1.6	}
78
79	pcg	1.11	void set(short events)
80	pcg	1.1	{
81	pcg	1.11	assert (p);
82			p->events = events;
83			}
84
85			void start (int fd, short events)
86			{
87			iom.reg (this); // make sure pfd is set
88
89			p->fd = fd;
90			p->events = events;
91	pcg	1.1	}
92
93	pcg	1.7	void stop ()
94	pcg	1.4	{
95			iom.unreg (this);
96			}
97	pcg	1.1	};
98
99	pcg	1.4	#define TSTAMP_CANCEL -1.
100
101	pcg	1.10	struct time_watcher : callback1<void, time_watcher &> {
102	pcg	1.6	bool registered; // already registered?
103	pcg	1.2	tstamp at;
104
105			template<class O1, class O2>
106	pcg	1.10	time_watcher (O1 object, void (O2::method)(time_watcher &))
107			: callback1<void, time_watcher &>(object,method)
108	pcg	1.6	, registered(false)
109	pcg	1.2	{ }
110	pcg	1.6
111	pcg	1.11	~time_watcher ();
112	pcg	1.1
113	pcg	1.2	void set (tstamp when);
114	pcg	1.4	void trigger ();
115	pcg	1.1
116	pcg	1.4	void operator ()()
117	pcg	1.1	{
118	pcg	1.4	trigger ();
119	pcg	1.1	}
120
121	pcg	1.4	void start ();
122			void start (tstamp when)
123	pcg	1.1	{
124	pcg	1.2	set (when);
125	pcg	1.4	}
126
127	pcg	1.7	void stop ()
128	pcg	1.4	{
129			iom.unreg (this);
130			}
131
132			void reset (tstamp when = TSTAMP_CANCEL)
133			{
134			stop ();
135	pcg	1.11
136	pcg	1.4	at = when;
137	pcg	1.1	}
138			};
139
140			#endif
141