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
#ifndef IOM_SIG
# define IOM_SIG 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
#if IOM_SIG
struct sig_watcher;
#endif

template<class watcher>
struct io_manager_vec : vector<watcher *> {
#if IOM_CHECK
  bool activity;
#endif

  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
#if IOM_SIG
  typedef io_manager_vec<sig_watcher> sig_vec;
  vector<sig_vec *> sw;
  static void sighandler (int signum);
#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
#if IOM_SIG
  void reg (sig_watcher   *w); void unreg (sig_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), at (0)
  { }
  ~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

#if IOM_SIG
struct sig_watcher : watcher, callback1<void, sig_watcher &> {
  int signum;

  void start (int signum);
  void stop () { iom.unreg (this); }

  template<class O1, class O2>
  sig_watcher (O1 *object, void (O2::*method) (sig_watcher &))
  : callback1<void, sig_watcher &> (object,method), signum (-1)
  { }
  ~sig_watcher () { stop (); }
};
#endif

#endif

Revision:	1.19
Committed:	Fri Apr 2 14:42:45 2004 UTC (20 years, 1 month ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.18:	+39 -10 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	1.19	#ifndef IOM_SIG
44			# define IOM_SIG 0
45			#endif
46	pcg	1.1
47	pcg	1.2	typedef double tstamp;
48			extern tstamp NOW;
49	pcg	1.1
50	pcg	1.15	struct watcher;
51			#if IOM_IO
52	pcg	1.1	struct io_watcher;
53	pcg	1.15	#endif
54			#if IOM_TIME
55	pcg	1.1	struct time_watcher;
56	pcg	1.15	#endif
57			#if IOM_CHECK
58			struct check_watcher;
59			#endif
60			#if IOM_IDLE
61			struct idle_watcher;
62			#endif
63	pcg	1.19	#if IOM_SIG
64			struct sig_watcher;
65			#endif
66	pcg	1.15
67			template<class watcher>
68	pcg	1.18	struct io_manager_vec : vector<watcher *> {
69	pcg	1.17	#if IOM_CHECK
70			bool activity;
71			#endif
72
73	pcg	1.15	void erase_unordered (unsigned int pos)
74			{
75			watcher w = (this)[size () - 1];
76			pop_back ();
77
78			if (size ())
79			if ((*this)[pos] = w)
80			w->active = pos + 1;
81			}
82			};
83	pcg	1.1
84			class io_manager {
85	pcg	1.15	#if IOM_IO
86			io_manager_vec<io_watcher> iow;
87			#endif
88			#if IOM_CHECK
89			io_manager_vec<check_watcher> cw;
90			#endif
91			#if IOM_TIME
92			io_manager_vec<time_watcher> tw;
93			#endif
94			#if IOM_IDLE
95			io_manager_vec<idle_watcher> iw;
96			#endif
97	pcg	1.19	#if IOM_SIG
98			typedef io_manager_vec<sig_watcher> sig_vec;
99			vector<sig_vec *> sw;
100			static void sighandler (int signum);
101			#endif
102	pcg	1.4
103	pcg	1.15	template<class watcher>
104			void reg (watcher *w, io_manager_vec<watcher> &queue);
105	pcg	1.1
106	pcg	1.15	template<class watcher>
107			void unreg (watcher *w, io_manager_vec<watcher> &queue);
108	pcg	1.6
109	pcg	1.15	public:
110	pcg	1.1	// register a watcher
111	pcg	1.15	#if IOM_IO
112			void reg (io_watcher w); void unreg (io_watcher w);
113			#endif
114			#if IOM_TIME
115			void reg (time_watcher w); void unreg (time_watcher w);
116			#endif
117			#if IOM_CHECK
118			void reg (check_watcher w); void unreg (check_watcher w);
119			#endif
120			#if IOM_IDLE
121			void reg (idle_watcher w); void unreg (idle_watcher w);
122			#endif
123	pcg	1.19	#if IOM_SIG
124			void reg (sig_watcher w); void unreg (sig_watcher w);
125			#endif
126	pcg	1.1
127			void loop ();
128
129			io_manager ();
130			~io_manager ();
131			};
132
133	pcg	1.11	extern io_manager iom; // a singleton, together with it's construction/destruction problems.
134	pcg	1.1
135	pcg	1.15	struct watcher {
136			int active; /* 0 == inactive, else index into respective vector */
137
138	pcg	1.19	watcher () : active (0) { }
139	pcg	1.15	};
140
141			#if IOM_IO
142			enum { EVENT_READ = 1, EVENT_WRITE = 2 };
143
144			struct io_watcher : watcher, callback2<void, io_watcher &, short> {
145	pcg	1.12	int fd;
146			short events;
147	pcg	1.10
148	pcg	1.15	void set (int fd_, short events_) { fd = fd_; events = events_; }
149
150			void set (short events_) { set (fd, events_); }
151			void start () { iom.reg (this); }
152			void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); }
153			void stop () { iom.unreg (this); }
154
155	pcg	1.1	template<class O1, class O2>
156	pcg	1.19	io_watcher (O1 object, void (O2::method) (io_watcher &, short))
157			: callback2<void, io_watcher &, short> (object,method)
158	pcg	1.15	{ }
159			~io_watcher () { stop (); }
160			};
161			#endif
162
163			#if IOM_TIME
164			struct time_watcher : watcher, callback1<void, time_watcher &> {
165			tstamp at;
166	pcg	1.2
167	pcg	1.15	void trigger ();
168	pcg	1.11
169	pcg	1.15	void set (tstamp when) { at = when; }
170	pcg	1.19	void operator () () { trigger (); }
171	pcg	1.15	void start () { iom.reg (this); }
172			void start (tstamp when) { set (when); iom.reg (this); }
173			void stop () { iom.unreg (this); }
174	pcg	1.6
175	pcg	1.15	template<class O1, class O2>
176	pcg	1.19	time_watcher (O1 object, void (O2::method) (time_watcher &))
177			: callback1<void, time_watcher &> (object,method), at (0)
178	pcg	1.15	{ }
179			~time_watcher () { stop (); }
180			};
181			#endif
182	pcg	1.11
183	pcg	1.15	#if IOM_CHECK
184			// run before checking for new events
185			struct check_watcher : watcher, callback1<void, check_watcher &> {
186			void start () { iom.reg (this); }
187			void stop () { iom.unreg (this); }
188	pcg	1.1
189	pcg	1.15	template<class O1, class O2>
190	pcg	1.19	check_watcher (O1 object, void (O2::method) (check_watcher &))
191			: callback1<void, check_watcher &> (object,method)
192	pcg	1.15	{ }
193			~check_watcher () { stop (); }
194	pcg	1.1	};
195	pcg	1.15	#endif
196	pcg	1.1
197	pcg	1.15	#if IOM_IDLE
198			// run after checking for any i/o, but before waiting
199			struct idle_watcher : watcher, callback1<void, idle_watcher &> {
200			void start () { iom.reg (this); }
201			void stop () { iom.unreg (this); }
202	pcg	1.2
203			template<class O1, class O2>
204	pcg	1.19	idle_watcher (O1 object, void (O2::method) (idle_watcher &))
205			: callback1<void, idle_watcher &> (object,method)
206	pcg	1.2	{ }
207	pcg	1.15	~idle_watcher () { stop (); }
208	pcg	1.19	};
209			#endif
210
211			#if IOM_SIG
212			struct sig_watcher : watcher, callback1<void, sig_watcher &> {
213			int signum;
214
215			void start (int signum);
216			void stop () { iom.unreg (this); }
217
218			template<class O1, class O2>
219			sig_watcher (O1 object, void (O2::method) (sig_watcher &))
220			: callback1<void, sig_watcher &> (object,method), signum (-1)
221			{ }
222			~sig_watcher () { stop (); }
223	pcg	1.1	};
224	pcg	1.15	#endif
225	pcg	1.1
226			#endif
227