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
#	User	Rev	Content
1	root	1.1	#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	root	1.2	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	root	1.1	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