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<p class='location'>Struct Registration</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.register">register</a><a href="#method.deregister">deregister</a><a href="#method.register_with">register_with</a><a href="#method.poll_read_ready">poll_read_ready</a><a href="#method.take_read_ready">take_read_ready</a><a href="#method.poll_write_ready">poll_write_ready</a><a href="#method.take_write_ready">take_write_ready</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Sync">Sync</a><a href="#impl-Send">Send</a></div></div><p class='location'><a href='../index.html'>tokio</a>::<wbr><a href='index.html'>reactor</a></p><script>window.sidebarCurrent = {name: 'Registration', 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</a>::<wbr><a href='index.html'>reactor</a>::<wbr><a class="struct" href=''>Registration</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_reactor/registration.rs.html#46-58' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct Registration { /* fields omitted */ }</pre><div class='docblock'><p>Associates an I/O resource with the reactor instance that drives it.</p>
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<p>A registration represents an I/O resource registered with a Reactor such
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that it will receive task notifications on readiness. This is the lowest
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level API for integrating with a reactor.</p>
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<p>The association between an I/O resource is made by calling <a href="#method.register"><code>register</code></a>.
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Once the association is established, it remains established until the
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registration instance is dropped. Subsequent calls to <a href="#method.register"><code>register</code></a> are
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no-ops.</p>
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<p>A registration instance represents two separate readiness streams. One for
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the read readiness and one for write readiness. These streams are
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independent and can be consumed from separate tasks.</p>
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<p><strong>Note</strong>: while <code>Registration</code> is <code>Sync</code>, the caller must ensure that there
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are at most two tasks that use a registration instance concurrently. One
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task for <a href="#method.poll_read_ready%60%5D"><code>poll_read_ready</code></a> and one task for <a href="#method.poll_write_ready%60%5D"><code>poll_write_ready</code></a>. While
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violating this requirement is "safe" from a Rust memory safety point of
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view, it will result in unexpected behavior in the form of lost
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notifications and tasks hanging.</p>
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<h2 id="platform-specific-events" class="section-header"><a href="#platform-specific-events">Platform-specific events</a></h2>
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<p><code>Registration</code> also allows receiving platform-specific <code>mio::Ready</code> events.
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These events are included as part of the read readiness event stream. The
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write readiness event stream is only for <code>Ready::writable()</code> events.</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 <a class="struct" href="../../tokio/reactor/struct.Registration.html" title="struct tokio::reactor::Registration">Registration</a></code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#91-440' 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>() -> <a class="struct" href="../../tokio/reactor/struct.Registration.html" title="struct tokio::reactor::Registration">Registration</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#96-101' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Create a new <code>Registration</code>.</p>
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<p>This registration is not associated with a Reactor instance. Call
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<code>register</code> to establish the association.</p>
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</div><h4 id='method.register' class="method"><span id='register.v' class='invisible'><code>pub fn <a href='#method.register' class='fnname'>register</a><T>(&self, io: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T) -> <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.bool.html">bool</a>, <a class="struct" href="../../tokio/io/struct.Error.html" title="struct tokio::io::Error">Error</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../mio/event_imp/trait.Evented.html" title="trait mio::event_imp::Evented">Evented</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#117-121' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Register the I/O resource with the default reactor.</p>
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<p>This function is safe to call concurrently and repeatedly. However, only
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the first call will establish the registration. Subsequent calls will be
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no-ops.</p>
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<h1 id="return" class="section-header"><a href="#return">Return</a></h1>
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<p>If the registration happened successfully, <code>Ok(true)</code> is returned.</p>
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<p>If an I/O resource has previously been successfully registered,
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<code>Ok(false)</code> is returned.</p>
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<p>If an error is encountered during registration, <code>Err</code> is returned.</p>
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</div><h4 id='method.deregister' class="method"><span id='deregister.v' class='invisible'><code>pub fn <a href='#method.deregister' class='fnname'>deregister</a><T>(&mut self, io: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T) -> <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>, <a class="struct" href="../../tokio/io/struct.Error.html" title="struct tokio::io::Error">Error</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../mio/event_imp/trait.Evented.html" title="trait mio::event_imp::Evented">Evented</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#139-150' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Deregister the I/O resource from the reactor it is associated with.</p>
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<p>This function must be called before the I/O resource associated with the
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registration is dropped.</p>
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<p>Note that deregistering does not guarantee that the I/O resource can be
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registered with a different reactor. Some I/O resource types can only be
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associated with a single reactor instance for their lifetime.</p>
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<h1 id="return-1" class="section-header"><a href="#return-1">Return</a></h1>
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<p>If the deregistration was successful, <code>Ok</code> is returned. Any calls to
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<code>Reactor::turn</code> that happen after a successful call to <code>deregister</code> will
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no longer result in notifications getting sent for this registration.</p>
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<p><code>Err</code> is returned if an error is encountered.</p>
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</div><h4 id='method.register_with' class="method"><span id='register_with.v' class='invisible'><code>pub fn <a href='#method.register_with' class='fnname'>register_with</a><T>(&self, io: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T, handle: &<a class="struct" href="../../tokio/reactor/struct.Handle.html" title="struct tokio::reactor::Handle">Handle</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.bool.html">bool</a>, <a class="struct" href="../../tokio/io/struct.Error.html" title="struct tokio::io::Error">Error</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../mio/event_imp/trait.Evented.html" title="trait mio::event_imp::Evented">Evented</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#164-173' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Register the I/O resource with the specified reactor.</p>
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<p>This function is safe to call concurrently and repeatedly. However, only
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the first call will establish the registration. Subsequent calls will be
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no-ops.</p>
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<p>If the registration happened successfully, <code>Ok(true)</code> is returned.</p>
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<p>If an I/O resource has previously been successfully registered,
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<code>Ok(false)</code> is returned.</p>
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<p>If an error is encountered during registration, <code>Err</code> is returned.</p>
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</div><h4 id='method.poll_read_ready' class="method"><span id='poll_read_ready.v' class='invisible'><code>pub fn <a href='#method.poll_read_ready' class='fnname'>poll_read_ready</a>(&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="enum" href="../../tokio/prelude/enum.Async.html" title="enum tokio::prelude::Async">Async</a><<a class="struct" href="../../mio/event_imp/struct.Ready.html" title="struct mio::event_imp::Ready">Ready</a>>, <a class="struct" href="../../tokio/io/struct.Error.html" title="struct tokio::io::Error">Error</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#281-287' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Poll for events on the I/O resource's read readiness stream.</p>
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<p>If the I/O resource receives a new read readiness event since the last
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call to <code>poll_read_ready</code>, it is returned. If it has not, the current
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task is notified once a new event is received.</p>
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<p>All events except <code>HUP</code> are <a href="https://docs.rs/mio/0.6/mio/struct.Poll.html#edge-triggered-and-level-triggered">edge-triggered</a>. Once <code>HUP</code> is returned,
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the function will always return <code>Ready(HUP)</code>. This should be treated as
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the end of the readiness stream.</p>
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<p>Ensure that <a href="#method.register"><code>register</code></a> has been called first.</p>
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<h1 id="return-value" class="section-header"><a href="#return-value">Return value</a></h1>
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<p>There are several possible return values:</p>
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<ul>
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<li>
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<p><code>Ok(Async::Ready(readiness))</code> means that the I/O resource has received
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a new readiness event. The readiness value is included.</p>
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</li>
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<li>
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<p><code>Ok(NotReady)</code> means that no new readiness events have been received
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since the last call to <code>poll_read_ready</code>.</p>
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</li>
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<li>
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<p><code>Err(err)</code> means that the registration has encountered an error. This
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error either represents a permanent internal error <strong>or</strong> the fact
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that <a href="#method.register"><code>register</code></a> was not called first.</p>
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</li>
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</ul>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>This function will panic if called from outside of a task context.</p>
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</div><h4 id='method.take_read_ready' class="method"><span id='take_read_ready.v' class='invisible'><code>pub fn <a href='#method.take_read_ready' class='fnname'>take_read_ready</a>(&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="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../../mio/event_imp/struct.Ready.html" title="struct mio::event_imp::Ready">Ready</a>>, <a class="struct" href="../../tokio/io/struct.Error.html" title="struct tokio::io::Error">Error</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#309-312' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Consume any pending read readiness event.</p>
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<p>This function is identical to <a href="#method.poll_read_ready"><code>poll_read_ready</code></a> <strong>except</strong> that it
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will not notify the current task when a new event is received. As such,
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it is safe to call this function from outside of a task context.</p>
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</div><h4 id='method.poll_write_ready' class="method"><span id='poll_write_ready.v' class='invisible'><code>pub fn <a href='#method.poll_write_ready' class='fnname'>poll_write_ready</a>(&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="enum" href="../../tokio/prelude/enum.Async.html" title="enum tokio::prelude::Async">Async</a><<a class="struct" href="../../mio/event_imp/struct.Ready.html" title="struct mio::event_imp::Ready">Ready</a>>, <a class="struct" href="../../tokio/io/struct.Error.html" title="struct tokio::io::Error">Error</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#346-352' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Poll for events on the I/O resource's write readiness stream.</p>
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<p>If the I/O resource receives a new write readiness event since the last
|
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call to <code>poll_write_ready</code>, it is returned. If it has not, the current
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task is notified once a new event is received.</p>
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<p>All events except <code>HUP</code> are <a href="https://docs.rs/mio/0.6/mio/struct.Poll.html#edge-triggered-and-level-triggered">edge-triggered</a>. Once <code>HUP</code> is returned,
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the function will always return <code>Ready(HUP)</code>. This should be treated as
|
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the end of the readiness stream.</p>
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<p>Ensure that <a href="#method.register"><code>register</code></a> has been called first.</p>
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<h1 id="return-value-1" class="section-header"><a href="#return-value-1">Return value</a></h1>
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<p>There are several possible return values:</p>
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<ul>
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<li>
|
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<p><code>Ok(Async::Ready(readiness))</code> means that the I/O resource has received
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a new readiness event. The readiness value is included.</p>
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</li>
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<li>
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<p><code>Ok(NotReady)</code> means that no new readiness events have been received
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since the last call to <code>poll_write_ready</code>.</p>
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</li>
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<li>
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<p><code>Err(err)</code> means that the registration has encountered an error. This
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error either represents a permanent internal error <strong>or</strong> the fact
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that <a href="#method.register"><code>register</code></a> was not called first.</p>
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</li>
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</ul>
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<h1 id="panics-1" class="section-header"><a href="#panics-1">Panics</a></h1>
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<p>This function will panic if called from outside of a task context.</p>
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</div><h4 id='method.take_write_ready' class="method"><span id='take_write_ready.v' class='invisible'><code>pub fn <a href='#method.take_write_ready' class='fnname'>take_write_ready</a>(&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="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../../mio/event_imp/struct.Ready.html" title="struct mio::event_imp::Ready">Ready</a>>, <a class="struct" href="../../tokio/io/struct.Error.html" title="struct tokio::io::Error">Error</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#374-376' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Consume any pending write readiness event.</p>
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<p>This function is identical to <a href="#method.poll_write_ready"><code>poll_write_ready</code></a> <strong>except</strong> that it
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will not notify the current task when a new event is received. As such,
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it is safe to call this function from outside of a task context.</p>
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<h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl <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/reactor/struct.Registration.html" title="struct tokio::reactor::Registration">Registration</a></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#45' 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="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>, <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#45' 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-Sync' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../tokio/reactor/struct.Registration.html" title="struct tokio::reactor::Registration">Registration</a></code><a href='#impl-Sync' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#443' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'></div><h3 id='impl-Send' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../tokio/reactor/struct.Registration.html" title="struct tokio::reactor::Registration">Registration</a></code><a href='#impl-Send' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/tokio_reactor/registration.rs.html#442' title='goto source code'>[src]</a></span></h3>
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