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.\" ========================================================================
.\"
.IX Title "Event::MakeMaker 3pm"
.TH Event::MakeMaker 3pm "2018-11-26" "perl v5.28.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Event::MakeMaker \- MakeMaker glue for the C\-level Event API
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
This is an advanced feature of Event.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
For optimal performance, hook into Event at the C\-level.  You'll need
to make changes to your \f(CW\*(C`Makefile.PL\*(C'\fR and add code to your \f(CW\*(C`xs\*(C'\fR /
\&\f(CW\*(C`c\*(C'\fR file(s).
.SH "WARNING"
.IX Header "WARNING"
When you hook in at the C\-level you get a \fIhuge\fR performance gain,
but you also reduce the chances that your code will work unmodified
with newer versions of \f(CW\*(C`perl\*(C'\fR or \f(CW\*(C`Event\*(C'\fR.  This may or may not be a
problem.  Just be aware, and set your expectations accordingly.
.SH "HOW TO"
.IX Header "HOW TO"
.SS "Makefile.PL"
.IX Subsection "Makefile.PL"
.Vb 1
\&  use Event::MakeMaker qw(event_args);
\&
\&  # ... set up %args ...
\&
\&  WriteMakefile(event_args(%args));
.Ve
.SS "\s-1XS\s0"
.IX Subsection "XS"
.Vb 1
\&  #include "EventAPI.h"
\&
\&  BOOT:
\&    I_EVENT_API("YourModule");
.Ve
.SS "\s-1API\s0 (v21)"
.IX Subsection "API (v21)"
.Vb 2
\& struct EventAPI {
\&    I32 Ver;
\&
\&    /* EVENTS */
\&    void (*queue   )(pe_event *ev);
\&    void (*start   )(pe_watcher *ev, int repeat);
\&    void (*now     )(pe_watcher *ev);
\&    void (*stop    )(pe_watcher *ev, int cancel_events);
\&    void (*cancel  )(pe_watcher *ev);
\&    void (*suspend )(pe_watcher *ev);
\&    void (*resume  )(pe_watcher *ev);
\&
\&    /* All constructors optionally take a stash and template.  Either
\&      or both can be NULL.  The template should not be a reference. */
\&    pe_idle     *(*new_idle  )(HV*, SV*);
\&    pe_timer    *(*new_timer )(HV*, SV*);
\&    pe_io       *(*new_io    )(HV*, SV*);
\&    pe_var      *(*new_var   )(HV*, SV*);
\&    pe_signal   *(*new_signal)(HV*, SV*);
\&
\&    /* TIMEABLE */
\&    void (*tstart)(pe_timeable *);
\&    void (*tstop)(pe_timeable *);
\&
\&    /* HOOKS */
\&    pe_qcallback *(*add_hook)(char *which, void *cb, void *ext_data);
\&    void (*cancel_hook)(pe_qcallback *qcb);
\&
\&    /* STATS */
\&    void (*install_stats)(pe_event_stats_vtbl *esvtbl);
\&    void (*collect_stats)(int yes);
\&    pe_ring *AllWatchers;
\&
\&    /* TYPEMAP */
\&    SV   *(*watcher_2sv)(pe_watcher *wa);
\&    void *(*sv_2watcher)(SV *sv);
\&    SV   *(*event_2sv)(pe_event *ev);
\&    void *(*sv_2event)(SV *sv);
\& };
.Ve
.SS "\s-1EXAMPLE\s0"
.IX Subsection "EXAMPLE"
.Vb 1
\&  static pe_io *X11_ev=0;
\&
\&  static void x_server_dispatch(void *ext_data)
\&  { ... }
\&
\&  if (!X11_ev) {
\&    X11_ev = GEventAPI\->new_io(0,0);
\&    X11_ev\->poll = PE_R;
\&    sv_setpv(X11_ev\->base.desc, "X::Server");
\&    X11_ev\->base.callback = (void*) x_server_dispatch;
\&    X11_ev\->base.ext_data = <whatever>;
\&    X11_ev\->base.prio = PE_PRIO_NORMAL;
\&  }
\&  X11_ev\->fd = x_fd;
\&  GEventAPI\->resume((pe_event*) X11_ev);
\&  GEventAPI\->start((pe_event*) X11_ev, 0);
.Ve
.SS "\s-1BUT I NEED A NEW TYPE OF WATCHER FOR MY INTERGALACTIC INFEROMETER\s0"
.IX Subsection "BUT I NEED A NEW TYPE OF WATCHER FOR MY INTERGALACTIC INFEROMETER"
I'd prefer not to export the entire Event.h apparatus in favor of
minimizing interdependencies.  If you really, really need to create a
new type of watcher send your problem analysis to the mailing list!