ev++.h

   1 #ifndef EVPP_H__
   2 #define EVPP_H__
   3
   4 #include "ev.h"
   5
   6 namespace ev {
   7
   8   template<class watcher>
   9   class callback
  10   {
  11     struct klass; // it is vital that this is never defined
  12
  13     klass *o;
  14     void (klass::*m)(watcher &, int);
  15
  16   public:
  17     template<class O1, class O2>
  18     explicit callback (O1 *object, void (O2::*method)(watcher &, int))
  19     {
  20       o = reinterpret_cast<klass *>(object);
  21       m = reinterpret_cast<void (klass::*)(watcher &, int)>(method);
  22     }
  23
  24     // this works because a standards-compliant C++ compiler
  25     // basically can't help it: it doesn't have the knowledge
  26     // required to miscompile (klass is not defined anywhere
  27     // and nothing is known about the constructor arguments) :)
  28     void call (watcher *w, int revents)
  29     {
  30       (o->*m) (*w, revents);
  31     }
  32   };
  33
  34   enum {
  35     UNDEF    = EV_UNDEF,
  36     NONE     = EV_NONE,
  37     READ     = EV_READ,
  38     WRITE    = EV_WRITE,
  39     TIMEOUT  = EV_TIMEOUT,
  40     PERIODIC = EV_PERIODIC,
  41     SIGNAL   = EV_SIGNAL,
  42     CHILD    = EV_CHILD,
  43     STAT     = EV_STAT,
  44     IDLE     = EV_IDLE,
  45     CHECK    = EV_CHECK,
  46     PREPARE  = EV_PREPARE,
  47     FORK     = EV_FORK,
  48     EMBED    = EV_EMBED,
  49     ERROR    = EV_ERROR,
  50   };
  51
  52   typedef ev_tstamp tstamp;
  53
  54   inline ev_tstamp now (EV_P)
  55   {
  56     return ev_now (EV_A);
  57   }
  58
  59   #if EV_MULTIPLICITY
  60
  61     #define EV_CONSTRUCT(cppstem)                                                       \
  62       EV_P;                                                                             \
  63                                                                                         \
  64       void set (EV_P)                                                                   \
  65       {                                                                                 \
  66         this->EV_A = EV_A;                                                              \
  67       }                                                                                 \
  68                                                                                         \
  69       template<class O1, class O2>                                                      \
  70       explicit cppstem (O1 *object, void (O2::*method)(cppstem &, int), EV_P = ev_default_loop (0)) \
  71       : callback<cppstem> (object, method), EV_A (EV_A)
  72
  73   #else
  74
  75     #define EV_CONSTRUCT(cppstem)                                                       \
  76       template<class O1, class O2>                                                      \
  77       explicit cppstem (O1 *object, void (O2::*method)(cppstem &, int))                 \
  78       : callback<cppstem> (object, method)
  79
  80   #endif
  81
  82   /* using a template here would require quite a bit more lines,
  83    * so a macro solution was chosen */
  84   #define EV_BEGIN_WATCHER(cppstem,cstem)                                               \
  85                                                                                         \
  86   struct cppstem : ev_ ## cstem, callback<cppstem>                                      \
  87   {                                                                                     \
  88     EV_CONSTRUCT (cppstem)                                                              \
  89     {                                                                                   \
  90       ev_init (static_cast<ev_ ## cstem *>(this), thunk);                               \
  91     }                                                                                   \
  92                                                                                         \
  93     bool is_active () const                                                             \
  94     {                                                                                   \
  95       return ev_is_active (static_cast<const ev_ ## cstem *>(this));                    \
  96     }                                                                                   \
  97                                                                                         \
  98     bool is_pending () const                                                            \
  99     {                                                                                   \
 100       return ev_is_pending (static_cast<const ev_ ## cstem *>(this));                   \
 101     }                                                                                   \
 102                                                                                         \
 103     void start ()                                                                       \
 104     {                                                                                   \
 105       ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this));                 \
 106     }                                                                                   \
 107                                                                                         \
 108     void stop ()                                                                        \
 109     {                                                                                   \
 110       ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this));                  \
 111     }                                                                                   \
 112                                                                                         \
 113     void operator ()(int events = EV_UNDEF)                                             \
 114     {                                                                                   \
 115       return call (this, events);                                                       \
 116     }                                                                                   \
 117                                                                                         \
 118     ~cppstem ()                                                                         \
 119     {                                                                                   \
 120       stop ();                                                                          \
 121     }                                                                                   \
 122                                                                                         \
 123   private:                                                                              \
 124                                                                                         \
 125     cppstem (const cppstem &o)                                                          \
 126     : callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0)                    \
 127     { /* disabled */ }                                                                  \
 128                                                                                         \
 129     void operator =(const cppstem &o) { /* disabled */ }                                \
 130                                                                                         \
 131     static void thunk (EV_P_ struct ev_ ## cstem *w, int revents)                       \
 132     {                                                                                   \
 133       (*static_cast<cppstem *>(w))(revents);                                            \
 134     }                                                                                   \
 135                                                                                         \
 136   public:
 137
 138   #define EV_END_WATCHER(cppstem,cstem)                                                 \
 139   };
 140
 141   EV_BEGIN_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   EV_END_WATCHER (io, io)
 164
 165   EV_BEGIN_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   EV_END_WATCHER (timer, timer)
 185
 186   #if EV_PERIODIC_ENABLE
 187   EV_BEGIN_WATCHER (periodic, periodic)
 188     void set (ev_tstamp at, ev_tstamp interval = 0.)
 189     {
 190       int active = is_active ();
 191       if (active) stop ();
 192       ev_periodic_set (static_cast<ev_periodic *>(this), at, interval, 0);
 193       if (active) start ();
 194     }
 195
 196     void start (ev_tstamp at, ev_tstamp interval = 0.)
 197     {
 198       set (at, interval);
 199       start ();
 200     }
 201
 202     void again ()
 203     {
 204       ev_periodic_again (EV_A_ static_cast<ev_periodic *>(this));
 205     }
 206   EV_END_WATCHER (periodic, periodic)
 207   #endif
 208
 209   EV_BEGIN_WATCHER (sig, signal)
 210     void set (int signum)
 211     {
 212       int active = is_active ();
 213       if (active) stop ();
 214       ev_signal_set (static_cast<ev_signal *>(this), signum);
 215       if (active) start ();
 216     }
 217
 218     void start (int signum)
 219     {
 220       set (signum);
 221       start ();
 222     }
 223   EV_END_WATCHER (sig, signal)
 224
 225   EV_BEGIN_WATCHER (child, child)
 226     void set (int pid)
 227     {
 228       int active = is_active ();
 229       if (active) stop ();
 230       ev_child_set (static_cast<ev_child *>(this), pid);
 231       if (active) start ();
 232     }
 233
 234     void start (int pid)
 235     {
 236       set (pid);
 237       start ();
 238     }
 239   EV_END_WATCHER (child, child)
 240
 241   #if EV_STAT_ENABLE
 242   EV_BEGIN_WATCHER (stat, stat)
 243     void set (const char *path, ev_tstamp interval = 0.)
 244     {
 245       int active = is_active ();
 246       if (active) stop ();
 247       ev_stat_set (static_cast<ev_stat *>(this), path, interval);
 248       if (active) start ();
 249     }
 250
 251     void start (const char *path, ev_tstamp interval = 0.)
 252     {
 253       stop ();
 254       set (path, interval);
 255       start ();
 256     }
 257
 258     void update ()
 259     {
 260       ev_stat_stat (EV_A_ static_cast<ev_stat *>(this));
 261     }
 262   EV_END_WATCHER (stat, stat)
 263   #endif
 264
 265   EV_BEGIN_WATCHER (idle, idle)
 266     void set () { }
 267   EV_END_WATCHER (idle, idle)
 268
 269   EV_BEGIN_WATCHER (prepare, prepare)
 270     void set () { }
 271   EV_END_WATCHER (prepare, prepare)
 272
 273   EV_BEGIN_WATCHER (check, check)
 274     void set () { }
 275   EV_END_WATCHER (check, check)
 276
 277   #if EV_EMBED_ENABLE
 278   EV_BEGIN_WATCHER (embed, embed)
 279     void start (struct ev_loop *embedded_loop)
 280     {
 281       stop ();
 282       ev_embed_set (static_cast<ev_embed *>(this), embedded_loop);
 283       start ();
 284     }
 285
 286     void sweep ()
 287     {
 288       ev_embed_sweep (EV_A_ static_cast<ev_embed *>(this));
 289     }
 290   EV_END_WATCHER (embed, embed)
 291   #endif
 292
 293   #if EV_FORK_ENABLE
 294   EV_BEGIN_WATCHER (fork, fork)
 295     void set () { }
 296   EV_END_WATCHER (fork, fork)
 297   #endif
 298
 299   #undef EV_CONSTRUCT
 300   #undef EV_BEGIN_WATCHER
 301   #undef EV_END_WATCHER
 302 }
 303
 304 #endif
 305