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<io_watcher *> iow;
  vector<time_watcher *> tw; // actually a heap
public:

  // register a watcher
  void reg (int fd, short events, 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;

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, void (object::*meth)(A), A arg) = 0;
  };
  template<class O1, class O2>
  struct proxy : proxy_base {
    virtual R call (void *obj, void (object::*meth)(A), A arg)
      {
        ((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<void (O2::*)(A)>(meth)))
          (arg);
      }
  };

  proxy_base *prxy;

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

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

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

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)
    { }

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

};

struct time_watcher : callback<void, tstamp &> {
  tstamp at;

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

  void set (tstamp when);

  void trigger ()
    {
      call (at);
    }

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

#endif

Revision:	1.2
Committed:	Fri Mar 21 21:17:02 2003 UTC (21 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+23 -17 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			vector<io_watcher *> iow;
39			vector<time_watcher *> tw; // actually a heap
40			public:
41
42			// register a watcher
43			void reg (int fd, short events, io_watcher *w);
44			void unreg (io_watcher *w);
45			void reg (time_watcher *w);
46			void unreg (time_watcher *w);
47
48			void loop ();
49
50			io_manager ();
51			~io_manager ();
52			};
53
54			extern io_manager iom;
55
56			template<class R, class A>
57			class callback {
58			struct object { };
59
60			void *obj;
61			R (object::*meth)(A arg);
62
63			// a proxy is a kind of recipe on how to call a specific class method
64			struct proxy_base {
65			virtual R call (void obj, void (object::meth)(A), A arg) = 0;
66			};
67			template<class O1, class O2>
68			struct proxy : proxy_base {
69			virtual R call (void obj, void (object::meth)(A), A arg)
70			{
71			((reinterpret_cast<O1 >(obj)) -> (reinterpret_cast<void (O2::*)(A)>(meth)))
72			(arg);
73			}
74			};
75
76			proxy_base *prxy;
77
78			public:
79			template<class O1, class O2>
80			callback (O1 object, void (O2::method)(A))
81			{
82			static proxy<O1,O2> p;
83			obj = reinterpret_cast<void *>(object);
84			meth = reinterpret_cast<void (object::*)(A)>(method);
85			prxy = &p;
86			}
87
88			R call(A arg)
89			{
90			return prxy->call (obj, meth, arg);
91			}
92	pcg	1.2
93			void stop ()
94			{
95			iom.unreg (this);
96			}
97	pcg	1.1	};
98
99			struct io_watcher : callback<void, short> {
100			template<class O1, class O2>
101	pcg	1.2	io_watcher (O1 object, void (O2::method)(short revents))
102	pcg	1.1	: callback<void, short>(object,method)
103	pcg	1.2	{ }
104
105			void start (int fd, short events)
106	pcg	1.1	{
107			iom.reg (fd, events, this);
108			}
109
110			};
111
112	pcg	1.2	struct time_watcher : callback<void, tstamp &> {
113			tstamp at;
114
115			template<class O1, class O2>
116			time_watcher (O1 object, void (O2::method)(tstamp &))
117			: callback<void, tstamp &>(object,method)
118			{ }
119	pcg	1.1
120	pcg	1.2	void set (tstamp when);
121	pcg	1.1
122	pcg	1.2	void trigger ()
123	pcg	1.1	{
124	pcg	1.2	call (at);
125	pcg	1.1	}
126
127	pcg	1.2	void start (tstamp when)
128	pcg	1.1	{
129	pcg	1.2	set (when);
130	pcg	1.1	}
131			};
132
133			#endif
134