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<title>The Ev class</title>
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</div><hr /><div id="class.ev" class="reference">
<h1 class="title">The Ev class</h1>
<div class="partintro"><p class="verinfo">(PECL ev >= 0.2.0)</p>
<div class="section" id="ev.intro">
<h2 class="title">Introduction</h2>
<p class="para">
Ev is a singleton providing access to the default loop and to some common
operations.
</p>
</div>
<div class="section" id="ev.synopsis">
<h2 class="title">Class synopsis</h2>
<div class="classsynopsis">
<div class="ooclass">
</div>
<div class="classsynopsisinfo">
<span class="ooclass">
<span class="modifier">final</span>
<strong class="classname">Ev</strong>
</span>
{</div>
<div class="classsynopsisinfo classsynopsisinfo_comment">/* Constants */</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.flag-auto"><var class="varname">FLAG_AUTO</var></a></var>
<span class="initializer"> = 0</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.flag-noenv"><var class="varname">FLAG_NOENV</var></a></var>
<span class="initializer"> = 16777216</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.flag-forkcheck"><var class="varname">FLAG_FORKCHECK</var></a></var>
<span class="initializer"> = 33554432</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.flag-noinotify"><var class="varname">FLAG_NOINOTIFY</var></a></var>
<span class="initializer"> = 1048576</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.flag-signalfd"><var class="varname">FLAG_SIGNALFD</var></a></var>
<span class="initializer"> = 2097152</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.flag-nosigmask"><var class="varname">FLAG_NOSIGMASK</var></a></var>
<span class="initializer"> = 4194304</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.run-nowait"><var class="varname">RUN_NOWAIT</var></a></var>
<span class="initializer"> = 1</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.run-once"><var class="varname">RUN_ONCE</var></a></var>
<span class="initializer"> = 2</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.break-cancel"><var class="varname">BREAK_CANCEL</var></a></var>
<span class="initializer"> = 0</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.break-one"><var class="varname">BREAK_ONE</var></a></var>
<span class="initializer"> = 1</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.break-all"><var class="varname">BREAK_ALL</var></a></var>
<span class="initializer"> = 2</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.minpri"><var class="varname">MINPRI</var></a></var>
<span class="initializer"> = -2</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.maxpri"><var class="varname">MAXPRI</var></a></var>
<span class="initializer"> = 2</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.read"><var class="varname">READ</var></a></var>
<span class="initializer"> = 1</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.write"><var class="varname">WRITE</var></a></var>
<span class="initializer"> = 2</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.timer"><var class="varname">TIMER</var></a></var>
<span class="initializer"> = 256</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.periodic"><var class="varname">PERIODIC</var></a></var>
<span class="initializer"> = 512</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.signal"><var class="varname">SIGNAL</var></a></var>
<span class="initializer"> = 1024</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.child"><var class="varname">CHILD</var></a></var>
<span class="initializer"> = 2048</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.stat"><var class="varname">STAT</var></a></var>
<span class="initializer"> = 4096</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.idle"><var class="varname">IDLE</var></a></var>
<span class="initializer"> = 8192</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.prepare"><var class="varname">PREPARE</var></a></var>
<span class="initializer"> = 16384</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.check"><var class="varname">CHECK</var></a></var>
<span class="initializer"> = 32768</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.embed"><var class="varname">EMBED</var></a></var>
<span class="initializer"> = 65536</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.custom"><var class="varname">CUSTOM</var></a></var>
<span class="initializer"> = 16777216</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.error"><var class="varname">ERROR</var></a></var>
<span class="initializer"> = 2147483648</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.backend-select"><var class="varname">BACKEND_SELECT</var></a></var>
<span class="initializer"> = 1</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.backend-poll"><var class="varname">BACKEND_POLL</var></a></var>
<span class="initializer"> = 2</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.backend-epoll"><var class="varname">BACKEND_EPOLL</var></a></var>
<span class="initializer"> = 4</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.backend-kqueue"><var class="varname">BACKEND_KQUEUE</var></a></var>
<span class="initializer"> = 8</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.backend-devpoll"><var class="varname">BACKEND_DEVPOLL</var></a></var>
<span class="initializer"> = 16</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.backend-port"><var class="varname">BACKEND_PORT</var></a></var>
<span class="initializer"> = 32</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.backend-all"><var class="varname">BACKEND_ALL</var></a></var>
<span class="initializer"> = 63</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">integer</span>
<var class="fieldsynopsis_varname"><a href="class.ev.html#ev.constants.backend-mask"><var class="varname">BACKEND_MASK</var></a></var>
<span class="initializer"> = 65535</span>
;</div>
<div class="classsynopsisinfo classsynopsisinfo_comment">/* Methods */</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">int</span>
<span class="methodname"><a href="ev.backend.html" class="methodname">backend</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">int</span>
<span class="methodname"><a href="ev.depth.html" class="methodname">depth</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">void</span>
<span class="methodname"><a href="ev.embeddablebackends.html" class="methodname">embeddableBackends</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">void</span>
<span class="methodname"><a href="ev.feedsignal.html" class="methodname">feedSignal</a></span>
( <span class="methodparam">
<span class="type">int</span>
<code class="parameter">$signum</code>
</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">void</span>
<span class="methodname"><a href="ev.feedsignalevent.html" class="methodname">feedSignalEvent</a></span>
( <span class="methodparam">
<span class="type">int</span>
<code class="parameter">$signum</code>
</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">int</span>
<span class="methodname"><a href="ev.iteration.html" class="methodname">iteration</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">double</span>
<span class="methodname"><a href="ev.now.html" class="methodname">now</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">void</span>
<span class="methodname"><a href="ev.nowupdate.html" class="methodname">nowUpdate</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">void</span>
<span class="methodname"><a href="ev.recommendedbackends.html" class="methodname">recommendedBackends</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">void</span>
<span class="methodname"><a href="ev.resume.html" class="methodname">resume</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">void</span>
<span class="methodname"><a href="ev.run.html" class="methodname">run</a></span>
([ <span class="methodparam">
<span class="type">int</span>
<code class="parameter">$flags</code>
</span>
] )</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">void</span>
<span class="methodname"><a href="ev.sleep.html" class="methodname">sleep</a></span>
( <span class="methodparam">
<span class="type">double</span>
<code class="parameter">$seconds</code>
</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">void</span>
<span class="methodname"><a href="ev.stop.html" class="methodname">stop</a></span>
([ <span class="methodparam">
<span class="type">int</span>
<code class="parameter">$how</code>
</span>
] )</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">void</span>
<span class="methodname"><a href="ev.supportedbackends.html" class="methodname">supportedBackends</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">void</span>
<span class="methodname"><a href="ev.suspend.html" class="methodname">suspend</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">double</span>
<span class="methodname"><a href="ev.time.html" class="methodname">time</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">final</span>
<span class="modifier">public</span>
<span class="modifier">static</span>
<span class="type">void</span>
<span class="methodname"><a href="ev.verify.html" class="methodname">verify</a></span>
( <span class="methodparam">void</span>
)</div>
}</div>
</div>
<div class="section" id="ev.constants">
<h2 class="title">Predefined Constants</h2>
<p class="para" id="ev.constants.loop-flags">
Flags passed to create a loop:
<dl>
<dt id="ev.constants.flag-auto">
<span class="term">
<strong><code>Ev::FLAG_AUTO</code></strong>
</span>
<dd>
<p class="para">
The default flags value
</p>
</dd>
</dt>
<dt id="ev.constants.flag-noenv">
<span class="term">
<strong><code>Ev::FLAG_NOENV</code></strong>
</span>
<dd>
<p class="para">
If this flag used(or the program runs setuid or setgid),
<em>libev</em>
won't look at the environment variable
<var class="varname"><var class="varname">LIBEV_FLAGS</var></var>
. Otherwise(by default),
<var class="varname"><var class="varname">LIBEV_FLAGS</var></var>
will override the flags completely if it is found. Useful for
performance tests and searching for bugs.
</p>
</dd>
</dt>
<dt id="ev.constants.flag-forkcheck">
<span class="term">
<strong><code>Ev::FLAG_FORKCHECK</code></strong>
</span>
<dd>
<p class="para">
Makes libev check for a fork in each iteration, instead of calling
<span class="methodname"><a href="evloop.fork.html" class="methodname">EvLoop::fork()</a></span>
manually. This works by calling
<em>getpid()</em>
on every iteration of the loop, and thus this might slow down the
event loop with lots of loop iterations, but usually is not
noticeable. This flag setting cannot be overridden or specified in the
<var class="varname"><var class="varname">LIBEV_FLAGS</var></var>
environment variable.
</p>
</dd>
</dt>
<dt id="ev.constants.flag-noinotify">
<span class="term">
<strong><code>Ev::FLAG_NOINOTIFY</code></strong>
</span>
<dd>
<p class="para">
When this flag is specified,
<em>libev</em>
won't attempt to use the
<em>inotify</em>
API for its
<a href="http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_stat_code_did_the_file_attri" class="link external">» ev_stat</a>
watchers. The flag can be useful to conserve inotify file descriptors,
as otherwise each loop using
<em>ev_stat</em>
watchers consumes one
<em>inotify</em>
handle.
</p>
</dd>
</dt>
<dt id="ev.constants.flag-signalfd">
<span class="term">
<strong><code>Ev::FLAG_SIGNALFD</code></strong>
</span>
<dd>
<p class="para">
When this flag is specified,
<em>libev</em>
will attempt to use the
<em>signalfd</em>
API for its
<a href="http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_signal_code_signal_me_when_a" class="link external">» ev_signal</a>
(and
<a href="http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_child_code_watch_out_for_pro" class="link external">» ev_child</a>
) watchers. This API delivers signals synchronously, which makes it
both faster and might make it possible to get the queued signal data.
It can also simplify signal handling with threads, as long as signals
are properly blocked in threads.
<em>Signalfd</em>
will not be used by default.
</p>
</dd>
</dt>
<dt id="ev.constants.flag-nosigmask">
<span class="term">
<strong><code>Ev::FLAG_NOSIGMASK</code></strong>
</span>
<dd>
<p class="para">
When this flag is specified,
<em>libev</em>
will avoid to modify the signal mask. Specifically, this means having
to make sure signals are unblocked before receiving them.
</p>
<p class="para">
This behaviour is useful for custom signal handling, or handling
signals only in specific threads.
</p>
</dd>
</dt>
</dl>
</p>
<p class="para" id="ev.constants.run-flags">
Flags passed to
<span class="methodname"><a href="ev.run.html" class="methodname">Ev::run()</a></span>
, or
<span class="methodname"><a href="evloop.run.html" class="methodname">EvLoop::run()</a></span>
<dl>
<dt id="ev.constants.run-nowait">
<span class="term">
<strong><code>Ev::RUN_NOWAIT</code></strong>
</span>
<dd>
<p class="para">
Means that event loop will look for new events, will handle those
events and any already outstanding ones, but will not wait and block
the process in case there are no events and will return after one
iteration of the loop. This is sometimes useful to poll and handle new
events while doing lengthy calculations, to keep the program
responsive.
</p>
</dd>
</dt>
<dt id="ev.constants.run-once">
<span class="term">
<strong><code>Ev::RUN_ONCE</code></strong>
</span>
<dd>
<p class="para">
Means that event loop will look for new events (waiting if necessary)
and will handle those and any already outstanding ones. It will block
the process until at least one new event arrives (which could be an
event internal to libev itself, so there is no guarantee that a
user-registered callback will be called), and will return after one
iteration of the loop.
</p>
</dd>
</dt>
</dl>
</p>
<p class="para" id="ev.constants.break-flags">
Flags passed to
<span class="methodname"><a href="ev.stop.html" class="methodname">Ev::stop()</a></span>
, or
<span class="methodname"><a href="evloop.stop.html" class="methodname">EvLoop::stop()</a></span>
<dl>
<dt id="ev.constants.break-cancel">
<span class="term">
<strong><code>Ev::BREAK_CANCEL</code></strong>
</span>
<dd>
<p class="para">
Cancel the break operation.
</p>
</dd>
</dt>
<dt id="ev.constants.break-one">
<span class="term">
<strong><code>Ev::BREAK_ONE</code></strong>
</span>
<dd>
<p class="para">
Makes the innermost
<span class="methodname"><a href="ev.run.html" class="methodname">Ev::run()</a></span>
(or
<span class="methodname"><a href="evloop.run.html" class="methodname">EvLoop::run()</a></span>
) call return.
</p>
</dd>
</dt>
<dt id="ev.constants.break-all">
<span class="term">
<strong><code>Ev::BREAK_ALL</code></strong>
</span>
<dd>
<p class="para">
Makes all nested
<span class="methodname"><a href="ev.run.html" class="methodname">Ev::run()</a></span>
(or
<span class="methodname"><a href="evloop.run.html" class="methodname">EvLoop::run()</a></span>
) calls return.
</p>
</dd>
</dt>
</dl>
</p>
<p class="para" id="ev.constants.watcher-pri">
Watcher priorities:
<dl>
<dt id="ev.constants.minpri">
<span class="term">
<strong><code>Ev::MINPRI</code></strong>
</span>
<dd>
<p class="para">
Minimum allowed watcher priority.
</p>
</dd>
</dt>
<dt id="ev.constants.maxpri">
<span class="term">
<strong><code>Ev::MAXPRI</code></strong>
</span>
<dd>
<p class="para">
Maximum allowed watcher priority.
</p>
</dd>
</dt>
</dl>
</p>
<p class="para" id="ev.constants.watcher-revents">
Bit masks of (received) events:
<dl>
<dt id="ev.constants.read">
<span class="term">
<strong><code>Ev::READ</code></strong>
</span>
<dd>
<p class="para">
The file descriptor in the
<a href="class.evio.html" class="classname">EvIo</a>
watcher has become readable.
</p>
</dd>
</dt>
<dt id="ev.constants.write">
<span class="term">
<strong><code>Ev::WRITE</code></strong>
</span>
<dd>
<p class="para">
The file descriptor in the
<a href="class.evio.html" class="classname">EvIo</a>
watcher has become writable.
</p>
</dd>
</dt>
<dt id="ev.constants.timer">
<span class="term">
<strong><code>Ev::TIMER</code></strong>
</span>
<dd>
<p class="para">
<a href="class.evtimer.html" class="classname">EvTimer</a>
watcher has been timed out.
</p>
</dd>
</dt>
<dt id="ev.constants.periodic">
<span class="term">
<strong><code>Ev::PERIODIC</code></strong>
</span>
<dd>
<p class="para">
<a href="class.evperiodic.html" class="classname">EvPeriodic</a>
watcher has been timed out.
</p>
</dd>
</dt>
<dt id="ev.constants.signal">
<span class="term">
<strong><code>Ev::SIGNAL</code></strong>
</span>
<dd>
<p class="para">
A signal specified in
<span class="methodname"><a href="evsignal.construct.html" class="methodname">EvSignal::__construct()</a></span>
has been received.
</p>
</dd>
</dt>
<dt id="ev.constants.child">
<span class="term">
<strong><code>Ev::CHILD</code></strong>
</span>
<dd>
<p class="para">
The
<em><code class="parameter">pid</code></em>
specified in
<span class="methodname"><a href="evchild.construct.html" class="methodname">EvChild::__construct()</a></span>
has received a status change.
</p>
</dd>
</dt>
<dt id="ev.constants.stat">
<span class="term">
<strong><code>Ev::STAT</code></strong>
</span>
<dd>
<p class="para">
The path specified in
<a href="class.evstat.html" class="classname">EvStat</a>
watcher changed its attributes.
</p>
</dd>
</dt>
<dt id="ev.constants.idle">
<span class="term">
<strong><code>Ev::IDLE</code></strong>
</span>
<dd>
<p class="para">
<a href="class.evidle.html" class="classname">EvIdle</a>
watcher works when there is nothing to do with other watchers.
</p>
</dd>
</dt>
<dt id="ev.constants.prepare">
<span class="term">
<strong><code>Ev::PREPARE</code></strong>
</span>
<dd>
<p class="para">
All
<a href="class.evprepare.html" class="classname">EvPrepare</a>
watchers are invoked just before
<span class="methodname"><a href="ev.run.html" class="methodname">Ev::run()</a></span>
starts. Thus,
<a href="class.evprepare.html" class="classname">EvPrepare</a>
watchers are the last watchers invoked before the event loop sleeps or
polls for new events.
</p>
</dd>
</dt>
<dt id="ev.constants.check">
<span class="term">
<strong><code>Ev::CHECK</code></strong>
</span>
<dd>
<p class="para">
All
<a href="class.evcheck.html" class="classname">EvCheck</a>
watchers are queued just after
<span class="methodname"><a href="ev.run.html" class="methodname">Ev::run()</a></span>
has gathered the new events, but before it queues any callbacks for
any received events. Thus,
<a href="class.evcheck.html" class="classname">EvCheck</a>
watchers will be invoked before any other watchers of the same or
lower priority within an event loop iteration.
</p>
</dd>
</dt>
<dt id="ev.constants.embed">
<span class="term">
<strong><code>Ev::EMBED</code></strong>
</span>
<dd>
<p class="para">
The embedded event loop specified in the
<a href="class.evembed.html" class="classname">EvEmbed</a>
watcher needs attention.
</p>
</dd>
</dt>
<dt id="ev.constants.custom">
<span class="term">
<strong><code>Ev::CUSTOM</code></strong>
</span>
<dd>
<p class="para">
Not ever sent(or otherwise used) by
<em>libev</em>
itself, but can be freely used by
<em>libev</em>
users to signal watchers (e.g. via
<span class="methodname"><a href="evwatcher.feed.html" class="methodname">EvWatcher::feed()</a></span>
).
</p>
</dd>
</dt>
<dt id="ev.constants.error">
<span class="term">
<strong><code>Ev::ERROR</code></strong>
</span>
<dd>
<p class="para">
An unspecified error has occurred, the watcher has been stopped. This
might happen because the watcher could not be properly started because
<em>libev</em>
ran out of memory, a file descriptor was found to be closed or any
other problem.
<em>Libev</em>
considers these application bugs. See also
<a href="http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#ANATOMY_OF_A_WATCHER_CONTENT" class="link external">» ANATOMY
OF A WATCHER</a>
</p>
</dd>
</dt>
</dl>
</p>
<p class="para" id="ev.constants.watcher-backends">
Backend flags:
<dl>
<dt id="ev.constants.backend-select">
<span class="term">
<strong><code>Ev::BACKEND_SELECT</code></strong>
</span>
<dd>
<p class="para">
<em>select(2) backend</em>
</p>
</dd>
</dt>
<dt id="ev.constants.backend-poll">
<span class="term">
<strong><code>Ev::BACKEND_POLL</code></strong>
</span>
<dd>
<p class="para">
<em>poll(2) backend</em>
</p>
</dd>
</dt>
<dt id="ev.constants.backend-epoll">
<span class="term">
<strong><code>Ev::BACKEND_EPOLL</code></strong>
</span>
<dd>
<p class="para">
Linux-specific
<em>epoll(7)</em>
backend for both pre- and post-2.6.9 kernels
</p>
</dd>
</dt>
<dt id="ev.constants.backend-kqueue">
<span class="term">
<strong><code>Ev::BACKEND_KQUEUE</code></strong>
</span>
<dd>
<p class="para">
<em>kqueue</em>
backend used on most BSD systems.
<a href="class.evembed.html" class="classname">EvEmbed</a>
watcher could be used to embed one loop(with kqueue backend) into
another. For instance, one can try to create an event loop with
<em>kqueue</em>
backend and use it for sockets only.
</p>
</dd>
</dt>
<dt id="ev.constants.backend-devpoll">
<span class="term">
<strong><code>Ev::BACKEND_DEVPOLL</code></strong>
</span>
<dd>
<p class="para">
Solaris 8 backend. This is not implemented yet.
</p>
</dd>
</dt>
<dt id="ev.constants.backend-port">
<span class="term">
<strong><code>Ev::BACKEND_PORT</code></strong>
</span>
<dd>
<p class="para">
Solaris 10 event port mechanism with a good scaling.
</p>
</dd>
</dt>
<dt id="ev.constants.backend-all">
<span class="term">
<strong><code>Ev::BACKEND_ALL</code></strong>
</span>
<dd>
<p class="para">
Try all backends(even currupted ones). It's not recommended to use it
explicitly. Bitwise operators should be applied here(e.g.
<strong><code>Ev::BACKEND_ALL</code></strong>
& ~
<strong><code>Ev::BACKEND_KQUEUE</code></strong>
) Use
<span class="methodname"><a href="ev.recommendedbackends.html" class="methodname">Ev::recommendedBackends()</a></span>
, or don't specify any backends at all.
</p>
</dd>
</dt>
<dt id="ev.constants.backend-mask">
<span class="term">
<strong><code>Ev::BACKEND_MASK</code></strong>
</span>
<dd>
<p class="para">
Not a backend, but a mask to select all backend bits from
<em><code class="parameter">flags</code></em>
value to mask out any backends(e.g. when modifying the
<var class="varname"><var class="varname">LIBEV_FLAGS</var></var>
environment variable).
</p>
</dd>
</dt>
</dl>
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
For the default loop during module initialization phase
<em>Ev</em>
registers
<a href="http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONTROLLING_EVENT_LOOPS_CO" class="link external">» ev_loop_fork</a>
call by means of
<em>pthread_atfork</em>
(if available).
</p>
</p></blockquote>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
There are methods providing access to the
<em class="emphasis">default event
loop</em>
in
<strong class="classname">Ev</strong>
class(e.g.
<span class="methodname"><a href="ev.iteration.html" class="methodname">Ev::iteration()</a></span>
,
<span class="methodname"><a href="ev.depth.html" class="methodname">Ev::depth()</a></span>
etc.) For
<em class="emphasis">custom loops</em>
(created with
<span class="methodname"><a href="evloop.construct.html" class="methodname">EvLoop::__construct()</a></span>
) these values may be accessed via corresponding properties and methods
of the
<a href="class.evloop.html" class="classname">EvLoop</a>
class.
</p>
<p class="para">
The instance of the default event loop itself can be fetched by means of
<span class="methodname"><a href="evloop.defaultloop.html" class="methodname">EvLoop::defaultLoop()</a></span>
method.
</p>
</p></blockquote>
</div>
</div>
<h2>Table of Contents</h2><ul class="chunklist chunklist_reference"><li><a href="ev.backend.html">Ev::backend</a> — Returns an integer describing the backend used by libev.</li><li><a href="ev.depth.html">Ev::depth</a> — Returns recursion depth</li><li><a href="ev.embeddablebackends.html">Ev::embeddableBackends</a> — Returns the set of backends that are embeddable in other event loops.</li><li><a href="ev.feedsignal.html">Ev::feedSignal</a> — Feed a signal event info Ev</li><li><a href="ev.feedsignalevent.html">Ev::feedSignalEvent</a> — Feed signal event into the default loop</li><li><a href="ev.iteration.html">Ev::iteration</a> — Return the number of times the default event loop has polled for new
events.</li><li><a href="ev.now.html">Ev::now</a> — Returns the time when the last iteration of the default event
loop has started.</li><li><a href="ev.nowupdate.html">Ev::nowUpdate</a> — Establishes the current time by querying the kernel, updating the time
returned by Ev::now in the progress.</li><li><a href="ev.recommendedbackends.html">Ev::recommendedBackends</a> — Returns a bit mask of recommended backends for current
platform.</li><li><a href="ev.resume.html">Ev::resume</a> — Resume previously suspended default event loop</li><li><a href="ev.run.html">Ev::run</a> — Begin checking for events and calling callbacks for the default
loop</li><li><a href="ev.sleep.html">Ev::sleep</a> — Block the process for the given number of seconds.</li><li><a href="ev.stop.html">Ev::stop</a> — Stops the default event loop</li><li><a href="ev.supportedbackends.html">Ev::supportedBackends</a> — Returns the set of backends supported by current libev
configuration.</li><li><a href="ev.suspend.html">Ev::suspend</a> — Suspend the default event loop</li><li><a href="ev.time.html">Ev::time</a> — Returns the current time in fractional seconds since the epoch.</li><li><a href="ev.verify.html">Ev::verify</a> — Performs internal consistency checks(for debugging)</li></ul>
</div>
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