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<p class='location'>Struct Timer</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a><a href="#method.get_park">get_park</a><a href="#method.get_park_mut">get_park_mut</a><a href="#method.new_with_now">new_with_now</a><a href="#method.handle">handle</a><a href="#method.turn">turn</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Default">Default</a><a href="#impl-Park">Park</a><a href="#impl-Drop">Drop</a></div></div><p class='location'><a href='../index.html'>tokio_timer</a>::<wbr><a href='index.html'>timer</a></p><script>window.sidebarCurrent = {name: 'Timer', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>tokio_timer</a>::<wbr><a href='index.html'>timer</a>::<wbr><a class="struct" href=''>Timer</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#123-147' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct Timer<T, N = <a class="struct" href="../../tokio_timer/clock/struct.Clock.html" title="struct tokio_timer::clock::Clock">SystemNow</a>> { /* fields omitted */ }</pre><div class='docblock'><p>Timer implementation that drives <a href="../struct.Delay.html"><code>Delay</code></a>, <a href="../struct.Interval.html"><code>Interval</code></a>, and <a href="../struct.Deadline.html"><code>Deadline</code></a>.</p>
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<p>A <code>Timer</code> instance tracks the state necessary for managing time and
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notifying the <a href="../struct.Delay.html"><code>Delay</code></a> instances once their deadlines are reached.</p>
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<p>It is expected that a single <code>Timer</code> instance manages many individual
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<code>Delay</code> instances. The <code>Timer</code> implementation is thread-safe and, as such,
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is able to handle callers from across threads.</p>
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<p>Callers do not use <code>Timer</code> directly to create <code>Delay</code> instances. Instead,
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<a href="#method.handle"><code>Handle</code></a> is used. A handle for the timer instance is obtained by calling
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<a href="#method.handle"><code>handle</code></a>. <a href="#method.handle"><code>Handle</code></a> is the type that implements <code>Clone</code> and is <code>Send + Sync</code>.</p>
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<p>After creating the <code>Timer</code> instance, the caller must repeatedly call
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<a href="#method.turn"><code>turn</code></a>. The timer will perform no work unless <a href="#method.turn"><code>turn</code></a> is called
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repeatedly.</p>
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<p>The <code>Timer</code> has a resolution of one millisecond. Any unit of time that falls
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between milliseconds are rounded up to the next millisecond.</p>
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<p>When the <code>Timer</code> instance is dropped, any outstanding <code>Delay</code> instance that
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has not elapsed will be notified with an error. At this point, calling
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<code>poll</code> on the <code>Delay</code> instance will result in <code>Err</code> being returned.</p>
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<h1 id="implementation" class="section-header"><a href="#implementation">Implementation</a></h1>
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<p><code>Timer</code> is based on the <a href="http://www.cs.columbia.edu/%7Enahum/w6998/papers/ton97-timing-wheels.pdf">paper by Varghese and Lauck</a>.</p>
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<p>A hashed timing wheel is a vector of slots, where each slot handles a time
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slice. As time progresses, the timer walks over the slot for the current
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instant, and processes each entry for that slot. When the timer reaches the
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end of the wheel, it starts again at the beginning.</p>
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<p>The <code>Timer</code> implementation maintains six wheels arranged in a set of levels.
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As the levels go up, the slots of the associated wheel represent larger
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intervals of time. At each level, the wheel has 64 slots. Each slot covers a
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range of time equal to the wheel at the lower level. At level zero, each
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slot represents one millisecond of time.</p>
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<p>The wheels are:</p>
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<ul>
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<li>Level 0: 64 x 1 millisecond slots.</li>
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<li>Level 1: 64 x 64 millisecond slots.</li>
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<li>Level 2: 64 x ~4 second slots.</li>
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<li>Level 3: 64 x ~4 minute slots.</li>
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<li>Level 4: 64 x ~4 hour slots.</li>
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<li>Level 5: 64 x ~12 day slots.</li>
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</ul>
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<p>When the timer processes entries at level zero, it will notify all the
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<a href="../struct.Delay.html"><code>Delay</code></a> instances as their deadlines have been reached. For all higher
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levels, all entries will be redistributed across the wheel at the next level
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down. Eventually, as time progresses, entries will <code>Delay</code> instances will
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either be canceled (dropped) or their associated entries will reach level
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zero and be notified.</p>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><code>impl<T> <a class="struct" href="../../tokio_timer/timer/struct.Timer.html" title="struct tokio_timer::timer::Timer">Timer</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../tokio_executor/park/trait.Park.html" title="trait tokio_executor::park::Park">Park</a>, </span></code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#187-203' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><code>pub fn <a href='#method.new' class='fnname'>new</a>(park: T) -> Self</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#200-202' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Create a new <code>Timer</code> instance that uses <code>park</code> to block the current
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thread.</p>
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<p>Once the timer has been created, a handle can be obtained using
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<a href="#method.handle"><code>handle</code></a>. The handle is used to create <code>Delay</code> instances.</p>
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<p>Use <code>default</code> when constructing a <code>Timer</code> using the default <code>park</code>
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instance.</p>
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</div></div><h3 id='impl-1' class='impl'><span class='in-band'><code>impl<T, N> <a class="struct" href="../../tokio_timer/timer/struct.Timer.html" title="struct tokio_timer::timer::Timer">Timer</a><T, N></code><a href='#impl-1' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#205-215' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.get_park' class="method"><span id='get_park.v' class='invisible'><code>pub fn <a href='#method.get_park' class='fnname'>get_park</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#207-209' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Returns a reference to the underlying <code>Park</code> instance.</p>
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</div><h4 id='method.get_park_mut' class="method"><span id='get_park_mut.v' class='invisible'><code>pub fn <a href='#method.get_park_mut' class='fnname'>get_park_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#212-214' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Returns a mutable reference to the underlying <code>Park</code> instance.</p>
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</div></div><h3 id='impl-2' class='impl'><span class='in-band'><code>impl<T, N> <a class="struct" href="../../tokio_timer/timer/struct.Timer.html" title="struct tokio_timer::timer::Timer">Timer</a><T, N> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../tokio_executor/park/trait.Park.html" title="trait tokio_executor::park::Park">Park</a>,<br> N: Now, </span></code><a href='#impl-2' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#217-446' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.new_with_now' class="method"><span id='new_with_now.v' class='invisible'><code>pub fn <a href='#method.new_with_now' class='fnname'>new_with_now</a>(park: T, now: N) -> Self</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#225-239' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Create a new <code>Timer</code> instance that uses <code>park</code> to block the current
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thread and <code>now</code> to get the current <code>Instant</code>.</p>
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<p>Specifying the source of time is useful when testing.</p>
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</div><h4 id='method.handle' class="method"><span id='handle.v' class='invisible'><code>pub fn <a href='#method.handle' class='fnname'>handle</a>(&self) -> <a class="struct" href="../../tokio_timer/timer/struct.Handle.html" title="struct tokio_timer::timer::Handle">Handle</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#247-249' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Returns a handle to the timer.</p>
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<p>The <code>Handle</code> is how <code>Delay</code> instances are created. The <code>Delay</code> instances
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can either be created directly or the <code>Handle</code> instance can be passed to
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<code>with_default</code>, setting the timer as the default timer for the execution
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context.</p>
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</div><h4 id='method.turn' class="method"><span id='turn.v' class='invisible'><code>pub fn <a href='#method.turn' class='fnname'>turn</a>(&mut self, max_wait: <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="https://doc.rust-lang.org/nightly/core/time/struct.Duration.html" title="struct core::time::Duration">Duration</a>>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="../../tokio_timer/timer/struct.Turn.html" title="struct tokio_timer::timer::Turn">Turn</a>, T::<a class="type" href="../../tokio_executor/park/trait.Park.html#associatedtype.Error" title="type tokio_executor::park::Park::Error">Error</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#270-277' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Performs one iteration of the timer loop.</p>
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<p>This function must be called repeatedly in order for the <code>Timer</code>
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instance to make progress. This is where the work happens.</p>
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<p>The <code>Timer</code> will use the <code>Park</code> instance that was specified in <a href="#method.new"><code>new</code></a>
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to block the current thread until the next <code>Delay</code> instance elapses. One
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call to <code>turn</code> results in at most one call to <code>park.park()</code>.</p>
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<h1 id="return" class="section-header"><a href="#return">Return</a></h1>
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<p>On success, <code>Ok(Turn)</code> is returned, where <code>Turn</code> is a placeholder type
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that currently does nothing but may, in the future, have functions add
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to provide information about the call to <code>turn</code>.</p>
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<p>If the call to <code>park.park()</code> fails, then <code>Err</code> is returned with the
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error.</p>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, N: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>> <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../tokio_timer/timer/struct.Timer.html" title="struct tokio_timer::timer::Timer">Timer</a><T, N></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#122' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, __arg_0: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#122' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id='impl-Default' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="../../tokio_timer/timer/struct.Timer.html" title="struct tokio_timer::timer::Timer">Timer</a><<a class="struct" href="../../tokio_executor/park/struct.ParkThread.html" title="struct tokio_executor::park::ParkThread">ParkThread</a>, <a class="struct" href="../../tokio_timer/clock/struct.Clock.html" title="struct tokio_timer::clock::Clock">SystemNow</a>></code><a href='#impl-Default' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#458-462' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.default' class="method"><span id='default.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default' class='fnname'>default</a>() -> Self</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#459-461' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Returns the "default value" for a type. <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default">Read more</a></p>
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</div></div><h3 id='impl-Park' class='impl'><span class='in-band'><code>impl<T, N> <a class="trait" href="../../tokio_executor/park/trait.Park.html" title="trait tokio_executor::park::Park">Park</a> for <a class="struct" href="../../tokio_timer/timer/struct.Timer.html" title="struct tokio_timer::timer::Timer">Timer</a><T, N> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../tokio_executor/park/trait.Park.html" title="trait tokio_executor::park::Park">Park</a>,<br> N: Now, </span></code><a href='#impl-Park' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#464-522' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='associatedtype.Unpark' class="type"><span id='Unpark.t' class='invisible'><code>type <a href='../../tokio_executor/park/trait.Park.html#associatedtype.Unpark' class="type">Unpark</a> = T::<a class="type" href="../../tokio_executor/park/trait.Park.html#associatedtype.Unpark" title="type tokio_executor::park::Park::Unpark">Unpark</a></code></span></h4>
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<div class='docblock'><p>Unpark handle type for the <code>Park</code> implementation.</p>
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</div><h4 id='associatedtype.Error' class="type"><span id='Error.t' class='invisible'><code>type <a href='../../tokio_executor/park/trait.Park.html#associatedtype.Error' class="type">Error</a> = T::<a class="type" href="../../tokio_executor/park/trait.Park.html#associatedtype.Error" title="type tokio_executor::park::Park::Error">Error</a></code></span></h4>
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<div class='docblock'><p>Error returned by <code>park</code></p>
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</div><h4 id='method.unpark' class="method"><span id='unpark.v' class='invisible'><code>fn <a href='../../tokio_executor/park/trait.Park.html#tymethod.unpark' class='fnname'>unpark</a>(&self) -> Self::<a class="type" href="../../tokio_executor/park/trait.Park.html#associatedtype.Unpark" title="type tokio_executor::park::Park::Unpark">Unpark</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#471-473' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Get a new <code>Unpark</code> handle associated with this <code>Park</code> instance.</p>
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</div><h4 id='method.park' class="method"><span id='park.v' class='invisible'><code>fn <a href='../../tokio_executor/park/trait.Park.html#tymethod.park' class='fnname'>park</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../tokio_executor/park/trait.Park.html#associatedtype.Error" title="type tokio_executor::park::Park::Error">Error</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#475-497' title='goto source code'>[src]</a></span></h4>
|
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<div class='docblock'><p>Block the current thread unless or until the token is available. <a href="../../tokio_executor/park/trait.Park.html#tymethod.park">Read more</a></p>
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</div><h4 id='method.park_timeout' class="method"><span id='park_timeout.v' class='invisible'><code>fn <a href='../../tokio_executor/park/trait.Park.html#tymethod.park_timeout' class='fnname'>park_timeout</a>(&mut self, duration: <a class="struct" href="https://doc.rust-lang.org/nightly/core/time/struct.Duration.html" title="struct core::time::Duration">Duration</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../../tokio_executor/park/trait.Park.html#associatedtype.Error" title="type tokio_executor::park::Park::Error">Error</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#499-521' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Park the current thread for at most <code>duration</code>. <a href="../../tokio_executor/park/trait.Park.html#tymethod.park_timeout">Read more</a></p>
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</div></div><h3 id='impl-Drop' class='impl'><span class='in-band'><code>impl<T, N> <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html" title="trait core::ops::drop::Drop">Drop</a> for <a class="struct" href="../../tokio_timer/timer/struct.Timer.html" title="struct tokio_timer::timer::Timer">Timer</a><T, N></code><a href='#impl-Drop' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#524-530' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.drop' class="method"><span id='drop.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop' class='fnname'>drop</a>(&mut self)</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_timer/timer/mod.rs.html#525-529' title='goto source code'>[src]</a></span></h4>
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|||
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<div class='docblock'><p>Executes the destructor for this type. <a href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop">Read more</a></p>
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