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Marc Alexander Lehmann 16 years ago
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31
ev.3
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@ -129,7 +129,7 @@
.\" ========================================================================
.\"
.IX Title ""<STANDARD INPUT>" 1"
.TH "<STANDARD INPUT>" 1 "2007-11-27" "perl v5.8.8" "User Contributed Perl Documentation"
.TH "<STANDARD INPUT>" 1 "2007-11-28" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
libev \- a high performance full\-featured event loop written in C
.SH "SYNOPSIS"
@ -1385,7 +1385,7 @@ otherwise always forced to be at least one) and all the other fields of
the stat buffer having unspecified contents.
.PP
Since there is no standard to do this, the portable implementation simply
calls \f(CW\*(C`stat (2)\*(C'\fR regulalry on the path to see if it changed somehow. You
calls \f(CW\*(C`stat (2)\*(C'\fR regularly on the path to see if it changed somehow. You
can specify a recommended polling interval for this case. If you specify
a polling interval of \f(CW0\fR (highly recommended!) then a \fIsuitable,
unspecified default\fR value will be used (which you can expect to be around
@ -1397,8 +1397,13 @@ This watcher type is not meant for massive numbers of stat watchers,
as even with OS-supported change notifications, this can be
resource\-intensive.
.PP
At the time of this writing, no specific \s-1OS\s0 backends are implemented, but
if demand increases, at least a kqueue and inotify backend will be added.
At the time of this writing, only the Linux inotify interface is
implemented (implementing kqueue support is left as an exercise for the
reader). Inotify will be used to give hints only and should not change the
semantics of \f(CW\*(C`ev_stat\*(C'\fR watchers, which means that libev sometimes needs
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.
.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
@ -2172,6 +2177,11 @@ backend for Solaris 10 systems.
.IP "\s-1EV_USE_DEVPOLL\s0" 4
.IX Item "EV_USE_DEVPOLL"
reserved for future expansion, works like the \s-1USE\s0 symbols above.
.IP "\s-1EV_USE_INOTIFY\s0" 4
.IX Item "EV_USE_INOTIFY"
If defined to be \f(CW1\fR, libev will compile in support for the Linux inotify
interface to speed up \f(CW\*(C`ev_stat\*(C'\fR watchers. Its actual availability will
be detected at runtime.
.IP "\s-1EV_H\s0" 4
.IX Item "EV_H"
The name of the \fIev.h\fR header file used to include it. The default if
@ -2226,7 +2236,14 @@ some inlining decisions, saves roughly 30% codesize of amd64.
\&\f(CW\*(C`ev_child\*(C'\fR watchers use a small hash table to distribute workload by
pid. The default size is \f(CW16\fR (or \f(CW1\fR with \f(CW\*(C`EV_MINIMAL\*(C'\fR), usually more
than enough. If you need to manage thousands of children you might want to
increase this value.
increase this value (\fImust\fR be a power of two).
.IP "\s-1EV_INOTIFY_HASHSIZE\s0" 4
.IX Item "EV_INOTIFY_HASHSIZE"
\&\f(CW\*(C`ev_staz\*(C'\fR watchers use a small hash table to distribute workload by
inotify watch id. The default size is \f(CW16\fR (or \f(CW1\fR with \f(CW\*(C`EV_MINIMAL\*(C'\fR),
usually more than enough. If you need to manage thousands of \f(CW\*(C`ev_stat\*(C'\fR
watchers you might want to increase this value (\fImust\fR be a power of
two).
.IP "\s-1EV_COMMON\s0" 4
.IX Item "EV_COMMON"
By default, all watchers have a \f(CW\*(C`void *data\*(C'\fR member. By redefining
@ -2300,8 +2317,8 @@ documentation for \f(CW\*(C`ev_default_init\*(C'\fR.
.IX Item "Starting io/check/prepare/idle/signal/child watchers: O(1)"
.IP "Stopping check/prepare/idle watchers: O(1)" 4
.IX Item "Stopping check/prepare/idle watchers: O(1)"
.IP "Stopping an io/signal/child watcher: O(number_of_watchers_for_this_(fd/signal/pid % 16))" 4
.IX Item "Stopping an io/signal/child watcher: O(number_of_watchers_for_this_(fd/signal/pid % 16))"
.IP "Stopping an io/signal/child watcher: O(number_of_watchers_for_this_(fd/signal/pid % \s-1EV_PID_HASHSIZE\s0))" 4
.IX Item "Stopping an io/signal/child watcher: O(number_of_watchers_for_this_(fd/signal/pid % EV_PID_HASHSIZE))"
.IP "Finding the next timer per loop iteration: O(1)" 4
.IX Item "Finding the next timer per loop iteration: O(1)"
.IP "Each change on a file descriptor per loop iteration: O(number_of_watchers_for_this_fd)" 4

15
ev.html
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@ -6,7 +6,7 @@
<meta name="description" content="Pod documentation for libev" />
<meta name="inputfile" content="&lt;standard input&gt;" />
<meta name="outputfile" content="&lt;standard output&gt;" />
<meta name="created" content="Wed Nov 28 12:27:27 2007" />
<meta name="created" content="Wed Nov 28 12:31:29 2007" />
<meta name="generator" content="Pod::Xhtml 1.57" />
<link rel="stylesheet" href="http://res.tst.eu/pod.css"/></head>
<body>
@ -135,12 +135,13 @@ watcher.</p>
</div>
<h1 id="FEATURES">FEATURES</h1>
<div id="FEATURES_CONTENT">
<p>Libev supports <code>select</code>, <code>poll</code>, the linux-specific <code>epoll</code>, the
bsd-specific <code>kqueue</code> and the solaris-specific event port mechanisms
for file descriptor events (<code>ev_io</code>), relative timers (<code>ev_timer</code>),
absolute timers with customised rescheduling (<code>ev_periodic</code>), synchronous
signals (<code>ev_signal</code>), process status change events (<code>ev_child</code>), and
event watchers dealing with the event loop mechanism itself (<code>ev_idle</code>,
<p>Libev supports <code>select</code>, <code>poll</code>, the Linux-specific <code>epoll</code>, the
BSD-specific <code>kqueue</code> and the Solaris-specific event port mechanisms
for file descriptor events (<code>ev_io</code>), the Linux <code>inotify</code> interface
(for <code>ev_stat</code>), relative timers (<code>ev_timer</code>), absolute timers
with customised rescheduling (<code>ev_periodic</code>), synchronous signals
(<code>ev_signal</code>), process status change events (<code>ev_child</code>), and event
watchers dealing with the event loop mechanism itself (<code>ev_idle</code>,
<code>ev_embed</code>, <code>ev_prepare</code> and <code>ev_check</code> watchers) as well as
file watchers (<code>ev_stat</code>) and even limited support for fork events
(<code>ev_fork</code>).</p>

13
ev.pod
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@ -65,12 +65,13 @@ watcher.
=head1 FEATURES
Libev supports C<select>, C<poll>, the linux-specific C<epoll>, the
bsd-specific C<kqueue> and the solaris-specific event port mechanisms
for file descriptor events (C<ev_io>), relative timers (C<ev_timer>),
absolute timers with customised rescheduling (C<ev_periodic>), synchronous
signals (C<ev_signal>), process status change events (C<ev_child>), and
event watchers dealing with the event loop mechanism itself (C<ev_idle>,
Libev supports C<select>, C<poll>, the Linux-specific C<epoll>, the
BSD-specific C<kqueue> and the Solaris-specific event port mechanisms
for file descriptor events (C<ev_io>), the Linux C<inotify> interface
(for C<ev_stat>), relative timers (C<ev_timer>), absolute timers
with customised rescheduling (C<ev_periodic>), synchronous signals
(C<ev_signal>), process status change events (C<ev_child>), and event
watchers dealing with the event loop mechanism itself (C<ev_idle>,
C<ev_embed>, C<ev_prepare> and C<ev_check> watchers) as well as
file watchers (C<ev_stat>) and even limited support for fork events
(C<ev_fork>).

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