libev/ev%2B%2B.h

#ifndef EVPP_H__
#define EVPP_H__

/* work in progress, don't use unless you know what you are doing */

namespace ev {

  template<class watcher>
  class callback
  {
    struct object { };

    void *obj;
    void (object::*meth)(watcher &, int);

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

    proxy_base *prxy;

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

    void call (watcher *w, int e) const
    {
      return prxy->call (obj, meth, *w, e);
    }
  };

  #include "ev.h"

  enum {
    UNDEF    = EV_UNDEF,
    NONE     = EV_NONE,
    READ     = EV_READ,
    WRITE    = EV_WRITE,
    TIMEOUT  = EV_TIMEOUT,
    PERIODIC = EV_PERIODIC,
    SIGNAL   = EV_SIGNAL,
    IDLE     = EV_IDLE,
    CHECK    = EV_CHECK,
    PREPARE  = EV_PREPARE,
    CHILD    = EV_CHILD,
    ERROR    = EV_ERROR,
  };

  typedef ev_tstamp tstamp;

  inline ev_tstamp now (EV_P)
  {
    return ev_now (EV_A);
  }

  #if EV_MULTIPLICITY

    #define EV_CONSTRUCT(cppstem)                                                       \
      EV_P;                                                                             \
                                                                                        \
      void set (EV_P)                                                                   \
      {                                                                                 \
        this->EV_A = EV_A;                                                              \
      }                                                                                 \
                                                                                        \
      template<class O1, class O2>                                                      \
      explicit cppstem (O1 *object, void (O2::*method)(cppstem &, int), EV_P = ev_default_loop (0)) \
      : callback<cppstem> (object, method), EV_A (EV_A)

  #else

    #define EV_CONSTRUCT(cppstem)                                                       \
      template<class O1, class O2>                                                      \
      explicit cppstem (O1 *object, void (O2::*method)(cppstem &, int))                 \
      : callback<cppstem> (object, method)

  #endif

  /* using a template here would require quite a bit more lines,
   * so a macro solution was chosen */
  #define EV_DECLARE_WATCHER(cppstem,cstem)                                             \
                                                                                        \
  extern "C" void cb_ ## cppstem (struct ev_ ## cstem *w, int revents);                 \
                                                                                        \
  struct cppstem : ev_ ## cstem, callback<cppstem>                                      \
  {                                                                                     \
    EV_CONSTRUCT (cppstem)                                                              \
    {                                                                                   \
      ev_init (static_cast<ev_ ## cstem *>(this), cb_ ## cppstem);                      \
    }                                                                                   \
                                                                                        \
    bool is_active () const                                                             \
    {                                                                                   \
      return ev_is_active (static_cast<const ev_ ## cstem *>(this));                    \
    }                                                                                   \
                                                                                        \
    bool is_pending () const                                                            \
    {                                                                                   \
      return ev_is_pending (static_cast<const ev_ ## cstem *>(this));                   \
    }                                                                                   \
                                                                                        \
    void start ()                                                                       \
    {                                                                                   \
      ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this));                 \
    }                                                                                   \
                                                                                        \
    void stop ()                                                                        \
    {                                                                                   \
      ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this));                  \
    }                                                                                   \
                                                                                        \
    void operator ()(int events = EV_UNDEF)                                             \
    {                                                                                   \
      return call (this, events);                                                       \
    }                                                                                   \
                                                                                        \
  private:                                                                              \
                                                                                        \
    cppstem (const cppstem &o)                                                          \
    : callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0)                    \
    { /* disabled */ }                                                                  \
    void operator =(const cppstem &o) { /* disabled */ }                                \
                                                                                        \
  public:

  EV_DECLARE_WATCHER (io, io)
    void set (int fd, int events)
    {
      int active = is_active ();
      if (active) stop ();
      ev_io_set (static_cast<ev_io *>(this), fd, events);
      if (active) start ();
    }

    void set (int events)
    {
      int active = is_active ();
      if (active) stop ();
      ev_io_set (static_cast<ev_io *>(this), fd, events);
      if (active) start ();
    }

    void start (int fd, int events)
    {
      set (fd, events);
      start ();
    }
  };

  EV_DECLARE_WATCHER (timer, timer)
    void set (ev_tstamp after, ev_tstamp repeat = 0.)
    {
      int active = is_active ();
      if (active) stop ();
      ev_timer_set (static_cast<ev_timer *>(this), after, repeat);
      if (active) start ();
    }

    void start (ev_tstamp after, ev_tstamp repeat = 0.)
    {
      set (after, repeat);
      start ();
    }

    void again ()
    {
      ev_timer_again (EV_A_ static_cast<ev_timer *>(this));
    }
  };

  EV_DECLARE_WATCHER (periodic, periodic)
    void set (ev_tstamp at, ev_tstamp interval = 0.)
    {
      int active = is_active ();
      if (active) stop ();
      ev_periodic_set (static_cast<ev_periodic *>(this), at, interval, 0);
      if (active) start ();
    }

    void start (ev_tstamp at, ev_tstamp interval = 0.)
    {
      set (at, interval);
      start ();
    }

    void again ()
    {
      ev_periodic_again (EV_A_ static_cast<ev_periodic *>(this));
    }
  };

  EV_DECLARE_WATCHER (idle, idle)
  };

  EV_DECLARE_WATCHER (prepare, prepare)
  };

  EV_DECLARE_WATCHER (check, check)
  };

  EV_DECLARE_WATCHER (sig, signal)
    void set (int signum)
    {
      int active = is_active ();
      if (active) stop ();
      ev_signal_set (static_cast<ev_signal *>(this), signum);
      if (active) start ();
    }

    void start (int signum)
    {
      set (signum);
      start ();
    }
  };

  EV_DECLARE_WATCHER (child, child)
    void set (int pid)
    {
      int active = is_active ();
      if (active) stop ();
      ev_child_set (static_cast<ev_child *>(this), pid);
      if (active) start ();
    }

    void start (int pid)
    {
      set (pid);
      start ();
    }
  };

  #undef EV_CONSTRUCT
  #undef EV_DECLARE_WATCHER
}

#endif

Revision:	1.2
Committed:	Sun Nov 11 00:05:59 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+15 -0 lines
Log Message:	make timers best-effort non-drifting
#	Content
1	#ifndef EVPP_H__
2	#define EVPP_H__
3
4	/* work in progress, don't use unless you know what you are doing */
5
6	namespace ev {
7
8	template<class watcher>
9	class callback
10	{
11	struct object { };
12
13	void *obj;
14	void (object::*meth)(watcher &, int);
15
16	/* a proxy is a kind of recipe on how to call a specific class method */
17	struct proxy_base {
18	virtual void call (void obj, void (object::meth)(watcher &, int), watcher &w, int) const = 0;
19	};
20	template<class O1, class O2>
21	struct proxy : proxy_base {
22	virtual void call (void obj, void (object::meth)(watcher &, int), watcher &w, int e) const
23	{
24	((reinterpret_cast<O1 >(obj)) -> (reinterpret_cast<void (O2::*)(watcher &, int)>(meth)))
25	(w, e);
26	}
27	};
28
29	proxy_base *prxy;
30
31	public:
32	template<class O1, class O2>
33	explicit callback (O1 object, void (O2::method)(watcher &, int))
34	{
35	static proxy<O1,O2> p;
36	obj = reinterpret_cast<void *>(object);
37	meth = reinterpret_cast<void (object::*)(watcher &, int)>(method);
38	prxy = &p;
39	}
40
41	void call (watcher *w, int e) const
42	{
43	return prxy->call (obj, meth, *w, e);
44	}
45	};
46
47	#include "ev.h"
48
49	enum {
50	UNDEF = EV_UNDEF,
51	NONE = EV_NONE,
52	READ = EV_READ,
53	WRITE = EV_WRITE,
54	TIMEOUT = EV_TIMEOUT,
55	PERIODIC = EV_PERIODIC,
56	SIGNAL = EV_SIGNAL,
57	IDLE = EV_IDLE,
58	CHECK = EV_CHECK,
59	PREPARE = EV_PREPARE,
60	CHILD = EV_CHILD,
61	ERROR = EV_ERROR,
62	};
63
64	typedef ev_tstamp tstamp;
65
66	inline ev_tstamp now (EV_P)
67	{
68	return ev_now (EV_A);
69	}
70
71	#if EV_MULTIPLICITY
72
73	#define EV_CONSTRUCT(cppstem) \
74	EV_P; \
75	\
76	void set (EV_P) \
77	{ \
78	this->EV_A = EV_A; \
79	} \
80	\
81	template<class O1, class O2> \
82	explicit cppstem (O1 object, void (O2::method)(cppstem &, int), EV_P = ev_default_loop (0)) \
83	: callback<cppstem> (object, method), EV_A (EV_A)
84
85	#else
86
87	#define EV_CONSTRUCT(cppstem) \
88	template<class O1, class O2> \
89	explicit cppstem (O1 object, void (O2::method)(cppstem &, int)) \
90	: callback<cppstem> (object, method)
91
92	#endif
93
94	/* using a template here would require quite a bit more lines,
95	* so a macro solution was chosen */
96	#define EV_DECLARE_WATCHER(cppstem,cstem) \
97	\
98	extern "C" void cb_ ## cppstem (struct ev_ ## cstem *w, int revents); \
99	\
100	struct cppstem : ev_ ## cstem, callback<cppstem> \
101	{ \
102	EV_CONSTRUCT (cppstem) \
103	{ \
104	ev_init (static_cast<ev_ ## cstem *>(this), cb_ ## cppstem); \
105	} \
106	\
107	bool is_active () const \
108	{ \
109	return ev_is_active (static_cast<const ev_ ## cstem *>(this)); \
110	} \
111	\
112	bool is_pending () const \
113	{ \
114	return ev_is_pending (static_cast<const ev_ ## cstem *>(this)); \
115	} \
116	\
117	void start () \
118	{ \
119	ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this)); \
120	} \
121	\
122	void stop () \
123	{ \
124	ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this)); \
125	} \
126	\
127	void operator ()(int events = EV_UNDEF) \
128	{ \
129	return call (this, events); \
130	} \
131	\
132	private: \
133	\
134	cppstem (const cppstem &o) \
135	: callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0) \
136	{ /* disabled */ } \
137	void operator =(const cppstem &o) { /* disabled */ } \
138	\
139	public:
140
141	EV_DECLARE_WATCHER (io, io)
142	void set (int fd, int events)
143	{
144	int active = is_active ();
145	if (active) stop ();
146	ev_io_set (static_cast<ev_io *>(this), fd, events);
147	if (active) start ();
148	}
149
150	void set (int events)
151	{
152	int active = is_active ();
153	if (active) stop ();
154	ev_io_set (static_cast<ev_io *>(this), fd, events);
155	if (active) start ();
156	}
157
158	void start (int fd, int events)
159	{
160	set (fd, events);
161	start ();
162	}
163	};
164
165	EV_DECLARE_WATCHER (timer, timer)
166	void set (ev_tstamp after, ev_tstamp repeat = 0.)
167	{
168	int active = is_active ();
169	if (active) stop ();
170	ev_timer_set (static_cast<ev_timer *>(this), after, repeat);
171	if (active) start ();
172	}
173
174	void start (ev_tstamp after, ev_tstamp repeat = 0.)
175	{
176	set (after, repeat);
177	start ();
178	}
179
180	void again ()
181	{
182	ev_timer_again (EV_A_ static_cast<ev_timer *>(this));
183	}
184	};
185
186	EV_DECLARE_WATCHER (periodic, periodic)
187	void set (ev_tstamp at, ev_tstamp interval = 0.)
188	{
189	int active = is_active ();
190	if (active) stop ();
191	ev_periodic_set (static_cast<ev_periodic *>(this), at, interval, 0);
192	if (active) start ();
193	}
194
195	void start (ev_tstamp at, ev_tstamp interval = 0.)
196	{
197	set (at, interval);
198	start ();
199	}
200
201	void again ()
202	{
203	ev_periodic_again (EV_A_ static_cast<ev_periodic *>(this));
204	}
205	};
206
207	EV_DECLARE_WATCHER (idle, idle)
208	};
209
210	EV_DECLARE_WATCHER (prepare, prepare)
211	};
212
213	EV_DECLARE_WATCHER (check, check)
214	};
215
216	EV_DECLARE_WATCHER (sig, signal)
217	void set (int signum)
218	{
219	int active = is_active ();
220	if (active) stop ();
221	ev_signal_set (static_cast<ev_signal *>(this), signum);
222	if (active) start ();
223	}
224
225	void start (int signum)
226	{
227	set (signum);
228	start ();
229	}
230	};
231
232	EV_DECLARE_WATCHER (child, child)
233	void set (int pid)
234	{
235	int active = is_active ();
236	if (active) stop ();
237	ev_child_set (static_cast<ev_child *>(this), pid);
238	if (active) start ();
239	}
240
241	void start (int pid)
242	{
243	set (pid);
244	start ();
245	}
246	};
247
248	#undef EV_CONSTRUCT
249	#undef EV_DECLARE_WATCHER
250	}
251
252	#endif
253