This is how one would do it normally anyway, the important point is that
the libev application should not optimise around libev but should leave
optimisations to libev.
+.PP
+\fIWatcher-Specific Functions\fR
+.IX Subsection "Watcher-Specific Functions"
.IP "ev_io_init (ev_io *, callback, int fd, int events)" 4
.IX Item "ev_io_init (ev_io *, callback, int fd, int events)"
.PD 0
The callback is guarenteed to be invoked only when its timeout has passed,
but if multiple timers become ready during the same loop iteration then
order of execution is undefined.
+.PP
+\fIWatcher-Specific Functions and Data Members\fR
+.IX Subsection "Watcher-Specific Functions and Data Members"
.IP "ev_timer_init (ev_timer *, callback, ev_tstamp after, ev_tstamp repeat)" 4
.IX Item "ev_timer_init (ev_timer *, callback, ev_tstamp after, ev_tstamp repeat)"
.PD 0
As with timers, the callback is guarenteed to be invoked only when the
time (\f(CW\*(C`at\*(C'\fR) has been passed, but if multiple periodic timers become ready
during the same loop iteration then order of execution is undefined.
+.PP
+\fIWatcher-Specific Functions and Data Members\fR
+.IX Subsection "Watcher-Specific Functions and Data Members"
.IP "ev_periodic_init (ev_periodic *, callback, ev_tstamp at, ev_tstamp interval, reschedule_cb)" 4
.IX Item "ev_periodic_init (ev_periodic *, callback, ev_tstamp at, ev_tstamp interval, reschedule_cb)"
.PD 0
as you don't register any with libev). Similarly, when the last signal
watcher for a signal is stopped libev will reset the signal handler to
\&\s-1SIG_DFL\s0 (regardless of what it was set to before).
+.PP
+\fIWatcher-Specific Functions and Data Members\fR
+.IX Subsection "Watcher-Specific Functions and Data Members"
.IP "ev_signal_init (ev_signal *, callback, int signum)" 4
.IX Item "ev_signal_init (ev_signal *, callback, int signum)"
.PD 0
.IX Subsection "ev_child - watch out for process status changes"
Child watchers trigger when your process receives a \s-1SIGCHLD\s0 in response to
some child status changes (most typically when a child of yours dies).
+.PP
+\fIWatcher-Specific Functions and Data Members\fR
+.IX Subsection "Watcher-Specific Functions and Data Members"
.IP "ev_child_init (ev_child *, callback, int pid)" 4
.IX Item "ev_child_init (ev_child *, callback, int pid)"
.PD 0
to fall back to regular polling again even with inotify, but changes are
usually detected immediately, and if the file exists there will be no
polling.
+.PP
+\fIWatcher-Specific Functions and Data Members\fR
+.IX Subsection "Watcher-Specific Functions and Data Members"
.IP "ev_stat_init (ev_stat *, callback, const char *path, ev_tstamp interval)" 4
.IX Item "ev_stat_init (ev_stat *, callback, const char *path, ev_tstamp interval)"
.PD 0
effect on its own sometimes), idle watchers are a good place to do
\&\*(L"pseudo\-background processing\*(R", or delay processing stuff to after the
event loop has handled all outstanding events.
+.PP
+\fIWatcher-Specific Functions and Data Members\fR
+.IX Subsection "Watcher-Specific Functions and Data Members"
.IP "ev_idle_init (ev_signal *, callback)" 4
.IX Item "ev_idle_init (ev_signal *, callback)"
Initialises and configures the idle watcher \- it has no parameters of any
loops those other event loops might be in an unusable state until their
\&\f(CW\*(C`ev_check\*(C'\fR watcher ran (always remind yourself to coexist peacefully with
others).
+.PP
+\fIWatcher-Specific Functions and Data Members\fR
+.IX Subsection "Watcher-Specific Functions and Data Members"
.IP "ev_prepare_init (ev_prepare *, callback)" 4
.IX Item "ev_prepare_init (ev_prepare *, callback)"
.PD 0
\& else
\& loop_lo = loop_hi;
.Ve
+.PP
+\fIWatcher-Specific Functions and Data Members\fR
+.IX Subsection "Watcher-Specific Functions and Data Members"
.IP "ev_embed_init (ev_embed *, callback, struct ev_loop *embedded_loop)" 4
.IX Item "ev_embed_init (ev_embed *, callback, struct ev_loop *embedded_loop)"
.PD 0
and only in the child after the fork. If whoever good citizen calling
\&\f(CW\*(C`ev_default_fork\*(C'\fR cheats and calls it in the wrong process, the fork
handlers will be invoked, too, of course.
+.PP
+\fIWatcher-Specific Functions and Data Members\fR
+.IX Subsection "Watcher-Specific Functions and Data Members"
.IP "ev_fork_init (ev_signal *, callback)" 4
.IX Item "ev_fork_init (ev_signal *, callback)"
Initialises and configures the fork watcher \- it has no parameters of any