ev++.h

   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