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 <sys/poll.h>

#include "slog.h"

typedef double tstamp;

extern tstamp NOW;

template<class R, class A> class callback;
struct io_watcher;
struct time_watcher;

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

  void idle_cb (tstamp &ts); time_watcher *idle;
public:

  void reschedule_time_watchers ();

  // register a watcher
  void reg (int fd, short events, io_watcher *w);
  void unreg (const io_watcher *w);
  void reg (time_watcher *w);
  void unreg (const time_watcher *w);
  
  void loop ();

  io_manager ();
  ~io_manager ();
};

extern io_manager iom;

template<class R, class A>
class callback {
  struct object { };

  void *obj;
  R (object::*meth)(A arg);

  // a proxy is a kind of recipe on how to call a specific class method
  struct proxy_base {
    virtual R call (void *obj, R (object::*meth)(A), A arg) = 0;
  };
  template<class O1, class O2>
  struct proxy : proxy_base {
    virtual R call (void *obj, R (object::*meth)(A), A arg)
      {
        ((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<R (O2::*)(A)>(meth)))
          (arg);
      }
  };

  proxy_base *prxy;

public:
  template<class O1, class O2>
  callback (O1 *object, R (O2::*method)(A))
    {
      static proxy<O1,O2> p;
      obj  = reinterpret_cast<void *>(object);
      meth = reinterpret_cast<R (object::*)(A)>(method);
      prxy = &p;
    }

  R call(A arg) const
    {
      return prxy->call (obj, meth, arg);
    }

  R operator ()(A arg) const
    {
      return call (arg);
    }
};

struct io_watcher : callback<void, short> {
  template<class O1, class O2>
  io_watcher (O1 *object, void (O2::*method)(short revents))
    : callback<void, short>(object,method)
    { }

  ~io_watcher ()
    {
      iom.unreg (this);
    }

  void start (int fd, short events)
    {
      iom.reg (fd, events, this);
    }

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

#define TSTAMP_CANCEL -1.

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

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

  ~time_watcher ()
    {
      iom.unreg (this);
    }

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

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

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

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

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

#endif

Revision:	1.6
Committed:	Fri Mar 28 04:05:10 2003 UTC (21 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.5:	+14 -0 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			#include <sys/poll.h>
25
26			#include "slog.h"
27
28	pcg	1.2	typedef double tstamp;
29	pcg	1.1
30	pcg	1.2	extern tstamp NOW;
31	pcg	1.1
32			template<class R, class A> class callback;
33			struct io_watcher;
34			struct time_watcher;
35
36			class io_manager {
37			vector<pollfd> pfs;
38	pcg	1.5	vector<const io_watcher *> iow;
39	pcg	1.1	vector<time_watcher *> tw; // actually a heap
40	pcg	1.4
41			void idle_cb (tstamp &ts); time_watcher *idle;
42	pcg	1.1	public:
43
44	pcg	1.6	void reschedule_time_watchers ();
45
46	pcg	1.1	// register a watcher
47			void reg (int fd, short events, io_watcher *w);
48	pcg	1.5	void unreg (const io_watcher *w);
49	pcg	1.1	void reg (time_watcher *w);
50	pcg	1.5	void unreg (const time_watcher *w);
51	pcg	1.1
52			void loop ();
53
54			io_manager ();
55			~io_manager ();
56			};
57
58			extern io_manager iom;
59
60			template<class R, class A>
61			class 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	pcg	1.5	virtual R call (void obj, R (object::meth)(A), A arg) = 0;
70	pcg	1.1	};
71			template<class O1, class O2>
72			struct proxy : proxy_base {
73	pcg	1.5	virtual R call (void obj, R (object::meth)(A), A arg)
74	pcg	1.1	{
75	pcg	1.5	((reinterpret_cast<O1 >(obj)) -> (reinterpret_cast<R (O2::*)(A)>(meth)))
76	pcg	1.1	(arg);
77			}
78			};
79
80			proxy_base *prxy;
81
82			public:
83			template<class O1, class O2>
84	pcg	1.5	callback (O1 object, R (O2::method)(A))
85	pcg	1.1	{
86			static proxy<O1,O2> p;
87			obj = reinterpret_cast<void *>(object);
88	pcg	1.5	meth = reinterpret_cast<R (object::*)(A)>(method);
89	pcg	1.1	prxy = &p;
90			}
91
92	pcg	1.5	R call(A arg) const
93	pcg	1.1	{
94			return prxy->call (obj, meth, arg);
95			}
96	pcg	1.2
97	pcg	1.5	R operator ()(A arg) const
98	pcg	1.2	{
99	pcg	1.4	return call (arg);
100	pcg	1.2	}
101	pcg	1.1	};
102
103			struct io_watcher : callback<void, short> {
104			template<class O1, class O2>
105	pcg	1.2	io_watcher (O1 object, void (O2::method)(short revents))
106	pcg	1.1	: callback<void, short>(object,method)
107	pcg	1.2	{ }
108
109	pcg	1.6	~io_watcher ()
110			{
111			iom.unreg (this);
112			}
113
114	pcg	1.2	void start (int fd, short events)
115	pcg	1.1	{
116			iom.reg (fd, events, this);
117			}
118
119	pcg	1.5	void stop () const
120	pcg	1.4	{
121			iom.unreg (this);
122			}
123	pcg	1.1	};
124
125	pcg	1.4	#define TSTAMP_CANCEL -1.
126
127	pcg	1.2	struct time_watcher : callback<void, tstamp &> {
128	pcg	1.6	bool registered; // already registered?
129	pcg	1.2	tstamp at;
130
131			template<class O1, class O2>
132			time_watcher (O1 object, void (O2::method)(tstamp &))
133			: callback<void, tstamp &>(object,method)
134	pcg	1.6	, registered(false)
135	pcg	1.2	{ }
136	pcg	1.6
137			~time_watcher ()
138			{
139			iom.unreg (this);
140			}
141	pcg	1.1
142	pcg	1.2	void set (tstamp when);
143	pcg	1.4	void trigger ();
144	pcg	1.1
145	pcg	1.4	void operator ()()
146	pcg	1.1	{
147	pcg	1.4	trigger ();
148	pcg	1.1	}
149
150	pcg	1.4	void start ();
151			void start (tstamp when)
152	pcg	1.1	{
153	pcg	1.2	set (when);
154	pcg	1.4	}
155
156	pcg	1.5	void stop () const
157	pcg	1.4	{
158			iom.unreg (this);
159			}
160
161			void reset (tstamp when = TSTAMP_CANCEL)
162			{
163			stop ();
164			at = when;
165	pcg	1.1	}
166			};
167
168			#endif
169