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    1 /*
    2  * libev simple C++ wrapper classes
    3  *
    4  * Copyright (c) 2007,2008,2010,2018,2020 Marc Alexander Lehmann <libev@schmorp.de>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without modifica-
    8  * tion, are permitted provided that the following conditions are met:
    9  *
   10  *   1.  Redistributions of source code must retain the above copyright notice,
   11  *       this list of conditions and the following disclaimer.
   12  *
   13  *   2.  Redistributions in binary form must reproduce the above copyright
   14  *       notice, this list of conditions and the following disclaimer in the
   15  *       documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
   18  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
   19  * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
   20  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
   21  * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   23  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
   25  * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   26  * OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * Alternatively, the contents of this file may be used under the terms of
   29  * the GNU General Public License ("GPL") version 2 or any later version,
   30  * in which case the provisions of the GPL are applicable instead of
   31  * the above. If you wish to allow the use of your version of this file
   32  * only under the terms of the GPL and not to allow others to use your
   33  * version of this file under the BSD license, indicate your decision
   34  * by deleting the provisions above and replace them with the notice
   35  * and other provisions required by the GPL. If you do not delete the
   36  * provisions above, a recipient may use your version of this file under
   37  * either the BSD or the GPL.
   38  */
   39 
   40 #ifndef EVPP_H__
   41 #define EVPP_H__
   42 
   43 #ifdef EV_H
   44 # include EV_H
   45 #else
   46 # include "ev.h"
   47 #endif
   48 
   49 #ifndef EV_USE_STDEXCEPT
   50 # define EV_USE_STDEXCEPT 1
   51 #endif
   52 
   53 #if EV_USE_STDEXCEPT
   54 # include <stdexcept>
   55 #endif
   56 
   57 namespace ev {
   58 
   59   typedef ev_tstamp tstamp;
   60 
   61   enum {
   62     UNDEF    = EV_UNDEF,
   63     NONE     = EV_NONE,
   64     READ     = EV_READ,
   65     WRITE    = EV_WRITE,
   66 #if EV_COMPAT3
   67     TIMEOUT  = EV_TIMEOUT,
   68 #endif
   69     TIMER    = EV_TIMER,
   70     PERIODIC = EV_PERIODIC,
   71     SIGNAL   = EV_SIGNAL,
   72     CHILD    = EV_CHILD,
   73     STAT     = EV_STAT,
   74     IDLE     = EV_IDLE,
   75     CHECK    = EV_CHECK,
   76     PREPARE  = EV_PREPARE,
   77     FORK     = EV_FORK,
   78     ASYNC    = EV_ASYNC,
   79     EMBED    = EV_EMBED,
   80 #   undef ERROR // some systems stupidly #define ERROR
   81     ERROR    = EV_ERROR
   82   };
   83 
   84   enum
   85   {
   86     AUTO      = EVFLAG_AUTO,
   87     NOENV     = EVFLAG_NOENV,
   88     FORKCHECK = EVFLAG_FORKCHECK,
   89 
   90     SELECT    = EVBACKEND_SELECT,
   91     POLL      = EVBACKEND_POLL,
   92     EPOLL     = EVBACKEND_EPOLL,
   93     KQUEUE    = EVBACKEND_KQUEUE,
   94     DEVPOLL   = EVBACKEND_DEVPOLL,
   95     PORT      = EVBACKEND_PORT
   96   };
   97 
   98   enum
   99   {
  100 #if EV_COMPAT3
  101     NONBLOCK = EVLOOP_NONBLOCK,
  102     ONESHOT  = EVLOOP_ONESHOT,
  103 #endif
  104     NOWAIT   = EVRUN_NOWAIT,
  105     ONCE     = EVRUN_ONCE
  106   };
  107 
  108   enum how_t
  109   {
  110     ONE = EVBREAK_ONE,
  111     ALL = EVBREAK_ALL
  112   };
  113 
  114   struct bad_loop
  115 #if EV_USE_STDEXCEPT
  116   : std::exception
  117 #endif
  118   {
  119 #if EV_USE_STDEXCEPT
  120     const char *what () const EV_NOEXCEPT
  121     {
  122       return "libev event loop cannot be initialized, bad value of LIBEV_FLAGS?";
  123     }
  124 #endif
  125   };
  126 
  127 #ifdef EV_AX
  128 #  undef EV_AX
  129 #endif
  130 
  131 #ifdef EV_AX_
  132 #  undef EV_AX_
  133 #endif
  134 
  135 #if EV_MULTIPLICITY
  136 #  define EV_AX  raw_loop
  137 #  define EV_AX_ raw_loop,
  138 #else
  139 #  define EV_AX
  140 #  define EV_AX_
  141 #endif
  142 
  143   struct loop_ref
  144   {
  145     loop_ref (EV_P) EV_NOEXCEPT
  146 #if EV_MULTIPLICITY
  147     : EV_AX (EV_A)
  148 #endif
  149     {
  150     }
  151 
  152     bool operator == (const loop_ref &other) const EV_NOEXCEPT
  153     {
  154 #if EV_MULTIPLICITY
  155       return EV_AX == other.EV_AX;
  156 #else
  157       return true;
  158 #endif
  159     }
  160 
  161     bool operator != (const loop_ref &other) const EV_NOEXCEPT
  162     {
  163 #if EV_MULTIPLICITY
  164       return ! (*this == other);
  165 #else
  166       return false;
  167 #endif
  168     }
  169 
  170 #if EV_MULTIPLICITY
  171     bool operator == (const EV_P) const EV_NOEXCEPT
  172     {
  173       return this->EV_AX == EV_A;
  174     }
  175 
  176     bool operator != (const EV_P) const EV_NOEXCEPT
  177     {
  178       return ! (*this == EV_A);
  179     }
  180 
  181     operator struct ev_loop * () const EV_NOEXCEPT
  182     {
  183       return EV_AX;
  184     }
  185 
  186     operator const struct ev_loop * () const EV_NOEXCEPT
  187     {
  188       return EV_AX;
  189     }
  190 
  191     bool is_default () const EV_NOEXCEPT
  192     {
  193       return EV_AX == ev_default_loop (0);
  194     }
  195 #endif
  196 
  197 #if EV_COMPAT3
  198     void loop (int flags = 0)
  199     {
  200       ev_run (EV_AX_ flags);
  201     }
  202 
  203     void unloop (how_t how = ONE) EV_NOEXCEPT
  204     {
  205       ev_break (EV_AX_ how);
  206     }
  207 #endif
  208 
  209     void run (int flags = 0)
  210     {
  211       ev_run (EV_AX_ flags);
  212     }
  213 
  214     void break_loop (how_t how = ONE) EV_NOEXCEPT
  215     {
  216       ev_break (EV_AX_ how);
  217     }
  218 
  219     void post_fork () EV_NOEXCEPT
  220     {
  221       ev_loop_fork (EV_AX);
  222     }
  223 
  224     unsigned int backend () const EV_NOEXCEPT
  225     {
  226       return ev_backend (EV_AX);
  227     }
  228 
  229     tstamp now () const EV_NOEXCEPT
  230     {
  231       return ev_now (EV_AX);
  232     }
  233 
  234     void ref () EV_NOEXCEPT
  235     {
  236       ev_ref (EV_AX);
  237     }
  238 
  239     void unref () EV_NOEXCEPT
  240     {
  241       ev_unref (EV_AX);
  242     }
  243 
  244 #if EV_FEATURE_API
  245     unsigned int iteration () const EV_NOEXCEPT
  246     {
  247       return ev_iteration (EV_AX);
  248     }
  249 
  250     unsigned int depth () const EV_NOEXCEPT
  251     {
  252       return ev_depth (EV_AX);
  253     }
  254 
  255     void set_io_collect_interval (tstamp interval) EV_NOEXCEPT
  256     {
  257       ev_set_io_collect_interval (EV_AX_ interval);
  258     }
  259 
  260     void set_timeout_collect_interval (tstamp interval) EV_NOEXCEPT
  261     {
  262       ev_set_timeout_collect_interval (EV_AX_ interval);
  263     }
  264 #endif
  265 
  266     // function callback
  267     void once (int fd, int events, tstamp timeout, void (*cb)(int, void *), void *arg = 0) EV_NOEXCEPT
  268     {
  269       ev_once (EV_AX_ fd, events, timeout, cb, arg);
  270     }
  271 
  272     // method callback
  273     template<class K, void (K::*method)(int)>
  274     void once (int fd, int events, tstamp timeout, K *object) EV_NOEXCEPT
  275     {
  276       once (fd, events, timeout, method_thunk<K, method>, object);
  277     }
  278 
  279     // default method == operator ()
  280     template<class K>
  281     void once (int fd, int events, tstamp timeout, K *object) EV_NOEXCEPT
  282     {
  283       once (fd, events, timeout, method_thunk<K, &K::operator ()>, object);
  284     }
  285 
  286     template<class K, void (K::*method)(int)>
  287     static void method_thunk (int revents, void *arg)
  288     {
  289       (static_cast<K *>(arg)->*method)
  290         (revents);
  291     }
  292 
  293     // no-argument method callback
  294     template<class K, void (K::*method)()>
  295     void once (int fd, int events, tstamp timeout, K *object) EV_NOEXCEPT
  296     {
  297       once (fd, events, timeout, method_noargs_thunk<K, method>, object);
  298     }
  299 
  300     template<class K, void (K::*method)()>
  301     static void method_noargs_thunk (int revents, void *arg)
  302     {
  303       (static_cast<K *>(arg)->*method)
  304         ();
  305     }
  306 
  307     // simpler function callback
  308     template<void (*cb)(int)>
  309     void once (int fd, int events, tstamp timeout) EV_NOEXCEPT
  310     {
  311       once (fd, events, timeout, simpler_func_thunk<cb>);
  312     }
  313 
  314     template<void (*cb)(int)>
  315     static void simpler_func_thunk (int revents, void *arg)
  316     {
  317       (*cb)
  318         (revents);
  319     }
  320 
  321     // simplest function callback
  322     template<void (*cb)()>
  323     void once (int fd, int events, tstamp timeout) EV_NOEXCEPT
  324     {
  325       once (fd, events, timeout, simplest_func_thunk<cb>);
  326     }
  327 
  328     template<void (*cb)()>
  329     static void simplest_func_thunk (int revents, void *arg)
  330     {
  331       (*cb)
  332         ();
  333     }
  334 
  335     void feed_fd_event (int fd, int revents) EV_NOEXCEPT
  336     {
  337       ev_feed_fd_event (EV_AX_ fd, revents);
  338     }
  339 
  340     void feed_signal_event (int signum) EV_NOEXCEPT
  341     {
  342       ev_feed_signal_event (EV_AX_ signum);
  343     }
  344 
  345 #if EV_MULTIPLICITY
  346     struct ev_loop* EV_AX;
  347 #endif
  348 
  349   };
  350 
  351 #if EV_MULTIPLICITY
  352   struct dynamic_loop : loop_ref
  353   {
  354 
  355     dynamic_loop (unsigned int flags = AUTO)
  356     : loop_ref (ev_loop_new (flags))
  357     {
  358       if (!EV_AX)
  359         throw bad_loop ();
  360     }
  361 
  362     ~dynamic_loop () EV_NOEXCEPT
  363     {
  364       ev_loop_destroy (EV_AX);
  365       EV_AX = 0;
  366     }
  367 
  368   private:
  369 
  370     dynamic_loop (const dynamic_loop &);
  371 
  372     dynamic_loop & operator= (const dynamic_loop &);
  373 
  374   };
  375 #endif
  376 
  377   struct default_loop : loop_ref
  378   {
  379     default_loop (unsigned int flags = AUTO)
  380 #if EV_MULTIPLICITY
  381     : loop_ref (ev_default_loop (flags))
  382 #endif
  383     {
  384       if (
  385 #if EV_MULTIPLICITY
  386           !EV_AX
  387 #else
  388           !ev_default_loop (flags)
  389 #endif
  390       )
  391         throw bad_loop ();
  392     }
  393 
  394   private:
  395     default_loop (const default_loop &);
  396     default_loop &operator = (const default_loop &);
  397   };
  398 
  399   inline loop_ref get_default_loop () EV_NOEXCEPT
  400   {
  401 #if EV_MULTIPLICITY
  402     return ev_default_loop (0);
  403 #else
  404     return loop_ref ();
  405 #endif
  406   }
  407 
  408 #undef EV_AX
  409 #undef EV_AX_
  410 
  411 #undef EV_PX
  412 #undef EV_PX_
  413 #if EV_MULTIPLICITY
  414 #  define EV_PX  loop_ref EV_A
  415 #  define EV_PX_ loop_ref EV_A_
  416 #else
  417 #  define EV_PX
  418 #  define EV_PX_
  419 #endif
  420 
  421   template<class ev_watcher, class watcher>
  422   struct base : ev_watcher
  423   {
  424     // scoped pause/unpause of a watcher
  425     struct freeze_guard
  426     {
  427       watcher &w;
  428       bool active;
  429 
  430       freeze_guard (watcher *self) EV_NOEXCEPT
  431       : w (*self), active (w.is_active ())
  432       {
  433         if (active) w.stop ();
  434       }
  435 
  436       ~freeze_guard ()
  437       {
  438         if (active) w.start ();
  439       }
  440     };
  441 
  442     #if EV_MULTIPLICITY
  443       EV_PX;
  444 
  445       // loop set
  446       void set (EV_P) EV_NOEXCEPT
  447       {
  448         this->EV_A = EV_A;
  449       }
  450     #endif
  451 
  452     base (EV_PX) EV_NOEXCEPT
  453     #if EV_MULTIPLICITY
  454       : EV_A (EV_A)
  455     #endif
  456     {
  457       ev_init (this, 0);
  458     }
  459 
  460     void set_ (const void *data, void (*cb)(EV_P_ ev_watcher *w, int revents)) EV_NOEXCEPT
  461     {
  462       this->data = (void *)data;
  463       ev_set_cb (static_cast<ev_watcher *>(this), cb);
  464     }
  465 
  466     // function callback
  467     template<void (*function)(watcher &w, int)>
  468     void set (void *data = 0) EV_NOEXCEPT
  469     {
  470       set_ (data, function_thunk<function>);
  471     }
  472 
  473     template<void (*function)(watcher &w, int)>
  474     static void function_thunk (EV_P_ ev_watcher *w, int revents)
  475     {
  476       function
  477         (*static_cast<watcher *>(w), revents);
  478     }
  479 
  480     // method callback
  481     template<class K, void (K::*method)(watcher &w, int)>
  482     void set (K *object) EV_NOEXCEPT
  483     {
  484       set_ (object, method_thunk<K, method>);
  485     }
  486 
  487     // default method == operator ()
  488     template<class K>
  489     void set (K *object) EV_NOEXCEPT
  490     {
  491       set_ (object, method_thunk<K, &K::operator ()>);
  492     }
  493 
  494     template<class K, void (K::*method)(watcher &w, int)>
  495     static void method_thunk (EV_P_ ev_watcher *w, int revents)
  496     {
  497       (static_cast<K *>(w->data)->*method)
  498         (*static_cast<watcher *>(w), revents);
  499     }
  500 
  501     // no-argument callback
  502     template<class K, void (K::*method)()>
  503     void set (K *object) EV_NOEXCEPT
  504     {
  505       set_ (object, method_noargs_thunk<K, method>);
  506     }
  507 
  508     template<class K, void (K::*method)()>
  509     static void method_noargs_thunk (EV_P_ ev_watcher *w, int revents)
  510     {
  511       (static_cast<K *>(w->data)->*method)
  512         ();
  513     }
  514 
  515     void operator ()(int events = EV_UNDEF)
  516     {
  517       return
  518         ev_cb (static_cast<ev_watcher *>(this))
  519           (static_cast<ev_watcher *>(this), events);
  520     }
  521 
  522     bool is_active () const EV_NOEXCEPT
  523     {
  524       return ev_is_active (static_cast<const ev_watcher *>(this));
  525     }
  526 
  527     bool is_pending () const EV_NOEXCEPT
  528     {
  529       return ev_is_pending (static_cast<const ev_watcher *>(this));
  530     }
  531 
  532     void feed_event (int revents) EV_NOEXCEPT
  533     {
  534       ev_feed_event (EV_A_ static_cast<ev_watcher *>(this), revents);
  535     }
  536   };
  537 
  538   inline tstamp now (EV_P) EV_NOEXCEPT
  539   {
  540     return ev_now (EV_A);
  541   }
  542 
  543   inline void delay (tstamp interval) EV_NOEXCEPT
  544   {
  545     ev_sleep (interval);
  546   }
  547 
  548   inline int version_major () EV_NOEXCEPT
  549   {
  550     return ev_version_major ();
  551   }
  552 
  553   inline int version_minor () EV_NOEXCEPT
  554   {
  555     return ev_version_minor ();
  556   }
  557 
  558   inline unsigned int supported_backends () EV_NOEXCEPT
  559   {
  560     return ev_supported_backends ();
  561   }
  562 
  563   inline unsigned int recommended_backends () EV_NOEXCEPT
  564   {
  565     return ev_recommended_backends ();
  566   }
  567 
  568   inline unsigned int embeddable_backends () EV_NOEXCEPT
  569   {
  570     return ev_embeddable_backends ();
  571   }
  572 
  573   inline void set_allocator (void *(*cb)(void *ptr, long size) EV_NOEXCEPT) EV_NOEXCEPT
  574   {
  575     ev_set_allocator (cb);
  576   }
  577 
  578   inline void set_syserr_cb (void (*cb)(const char *msg) EV_NOEXCEPT) EV_NOEXCEPT
  579   {
  580     ev_set_syserr_cb (cb);
  581   }
  582 
  583   #if EV_MULTIPLICITY
  584     #define EV_CONSTRUCT(cppstem,cstem)                                                 \
  585       (EV_PX = get_default_loop ()) EV_NOEXCEPT                                         \
  586         : base<ev_ ## cstem, cppstem> (EV_A)                                            \
  587       {                                                                                 \
  588       }
  589   #else
  590     #define EV_CONSTRUCT(cppstem,cstem)                                                 \
  591       () EV_NOEXCEPT                                                                    \
  592       {                                                                                 \
  593       }
  594   #endif
  595 
  596   /* using a template here would require quite a few more lines,
  597    * so a macro solution was chosen */
  598   #define EV_BEGIN_WATCHER(cppstem,cstem)                                           \
  599                                                                                         \
  600   struct cppstem : base<ev_ ## cstem, cppstem>                                          \
  601   {                                                                                     \
  602     void start () EV_NOEXCEPT                                                           \
  603     {                                                                                   \
  604       ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this));                 \
  605     }                                                                                   \
  606                                                                                         \
  607     void stop () EV_NOEXCEPT                                                            \
  608     {                                                                                   \
  609       ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this));                  \
  610     }                                                                                   \
  611                                                                                         \
  612     cppstem EV_CONSTRUCT(cppstem,cstem)                                                 \
  613                                                                                         \
  614     ~cppstem () EV_NOEXCEPT                                                             \
  615     {                                                                                   \
  616       stop ();                                                                          \
  617     }                                                                                   \
  618                                                                                         \
  619     using base<ev_ ## cstem, cppstem>::set;                                             \
  620                                                                                         \
  621   private:                                                                              \
  622                                                                                         \
  623     cppstem (const cppstem &o);                                                         \
  624                                                                                         \
  625     cppstem &operator =(const cppstem &o);                                              \
  626                                                                                         \
  627   public:
  628 
  629   #define EV_END_WATCHER(cppstem,cstem)                                                 \
  630   };
  631 
  632   EV_BEGIN_WATCHER (io, io)
  633     void set (int fd, int events) EV_NOEXCEPT
  634     {
  635       freeze_guard freeze (this);
  636       ev_io_set (static_cast<ev_io *>(this), fd, events);
  637     }
  638 
  639     void set (int events) EV_NOEXCEPT
  640     {
  641       freeze_guard freeze (this);
  642       ev_io_modify (static_cast<ev_io *>(this), events);
  643     }
  644 
  645     void start (int fd, int events) EV_NOEXCEPT
  646     {
  647       set (fd, events);
  648       start ();
  649     }
  650   EV_END_WATCHER (io, io)
  651 
  652   EV_BEGIN_WATCHER (timer, timer)
  653     void set (ev_tstamp after, ev_tstamp repeat = 0.) EV_NOEXCEPT
  654     {
  655       freeze_guard freeze (this);
  656       ev_timer_set (static_cast<ev_timer *>(this), after, repeat);
  657     }
  658 
  659     void start (ev_tstamp after, ev_tstamp repeat = 0.) EV_NOEXCEPT
  660     {
  661       set (after, repeat);
  662       start ();
  663     }
  664 
  665     void again () EV_NOEXCEPT
  666     {
  667       ev_timer_again (EV_A_ static_cast<ev_timer *>(this));
  668     }
  669 
  670     ev_tstamp remaining ()
  671     {
  672       return ev_timer_remaining (EV_A_ static_cast<ev_timer *>(this));
  673     }
  674   EV_END_WATCHER (timer, timer)
  675 
  676   #if EV_PERIODIC_ENABLE
  677   EV_BEGIN_WATCHER (periodic, periodic)
  678     void set (ev_tstamp at, ev_tstamp interval = 0.) EV_NOEXCEPT
  679     {
  680       freeze_guard freeze (this);
  681       ev_periodic_set (static_cast<ev_periodic *>(this), at, interval, 0);
  682     }
  683 
  684     void start (ev_tstamp at, ev_tstamp interval = 0.) EV_NOEXCEPT
  685     {
  686       set (at, interval);
  687       start ();
  688     }
  689 
  690     void again () EV_NOEXCEPT
  691     {
  692       ev_periodic_again (EV_A_ static_cast<ev_periodic *>(this));
  693     }
  694   EV_END_WATCHER (periodic, periodic)
  695   #endif
  696 
  697   #if EV_SIGNAL_ENABLE
  698   EV_BEGIN_WATCHER (sig, signal)
  699     void set (int signum) EV_NOEXCEPT
  700     {
  701       freeze_guard freeze (this);
  702       ev_signal_set (static_cast<ev_signal *>(this), signum);
  703     }
  704 
  705     void start (int signum) EV_NOEXCEPT
  706     {
  707       set (signum);
  708       start ();
  709     }
  710   EV_END_WATCHER (sig, signal)
  711   #endif
  712 
  713   #if EV_CHILD_ENABLE
  714   EV_BEGIN_WATCHER (child, child)
  715     void set (int pid, int trace = 0) EV_NOEXCEPT
  716     {
  717       freeze_guard freeze (this);
  718       ev_child_set (static_cast<ev_child *>(this), pid, trace);
  719     }
  720 
  721     void start (int pid, int trace = 0) EV_NOEXCEPT
  722     {
  723       set (pid, trace);
  724       start ();
  725     }
  726   EV_END_WATCHER (child, child)
  727   #endif
  728 
  729   #if EV_STAT_ENABLE
  730   EV_BEGIN_WATCHER (stat, stat)
  731     void set (const char *path, ev_tstamp interval = 0.) EV_NOEXCEPT
  732     {
  733       freeze_guard freeze (this);
  734       ev_stat_set (static_cast<ev_stat *>(this), path, interval);
  735     }
  736 
  737     void start (const char *path, ev_tstamp interval = 0.) EV_NOEXCEPT
  738     {
  739       stop ();
  740       set (path, interval);
  741       start ();
  742     }
  743 
  744     void update () EV_NOEXCEPT
  745     {
  746       ev_stat_stat (EV_A_ static_cast<ev_stat *>(this));
  747     }
  748   EV_END_WATCHER (stat, stat)
  749   #endif
  750 
  751   #if EV_IDLE_ENABLE
  752   EV_BEGIN_WATCHER (idle, idle)
  753     void set () EV_NOEXCEPT { }
  754   EV_END_WATCHER (idle, idle)
  755   #endif
  756 
  757   #if EV_PREPARE_ENABLE
  758   EV_BEGIN_WATCHER (prepare, prepare)
  759     void set () EV_NOEXCEPT { }
  760   EV_END_WATCHER (prepare, prepare)
  761   #endif
  762 
  763   #if EV_CHECK_ENABLE
  764   EV_BEGIN_WATCHER (check, check)
  765     void set () EV_NOEXCEPT { }
  766   EV_END_WATCHER (check, check)
  767   #endif
  768 
  769   #if EV_EMBED_ENABLE
  770   EV_BEGIN_WATCHER (embed, embed)
  771     void set_embed (struct ev_loop *embedded_loop) EV_NOEXCEPT
  772     {
  773       freeze_guard freeze (this);
  774       ev_embed_set (static_cast<ev_embed *>(this), embedded_loop);
  775     }
  776 
  777     void start (struct ev_loop *embedded_loop) EV_NOEXCEPT
  778     {
  779       set (embedded_loop);
  780       start ();
  781     }
  782 
  783     void sweep ()
  784     {
  785       ev_embed_sweep (EV_A_ static_cast<ev_embed *>(this));
  786     }
  787   EV_END_WATCHER (embed, embed)
  788   #endif
  789 
  790   #if EV_FORK_ENABLE
  791   EV_BEGIN_WATCHER (fork, fork)
  792     void set () EV_NOEXCEPT { }
  793   EV_END_WATCHER (fork, fork)
  794   #endif
  795 
  796   #if EV_ASYNC_ENABLE
  797   EV_BEGIN_WATCHER (async, async)
  798     void send () EV_NOEXCEPT
  799     {
  800       ev_async_send (EV_A_ static_cast<ev_async *>(this));
  801     }
  802 
  803     bool async_pending () EV_NOEXCEPT
  804     {
  805       return ev_async_pending (static_cast<ev_async *>(this));
  806     }
  807   EV_END_WATCHER (async, async)
  808   #endif
  809 
  810   #undef EV_PX
  811   #undef EV_PX_
  812   #undef EV_CONSTRUCT
  813   #undef EV_BEGIN_WATCHER
  814   #undef EV_END_WATCHER
  815 }
  816 
  817 #endif
  818