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<h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>futures</a>::<wbr><a href='index.html'>executor</a>::<wbr><a class="struct" href=''>Spawn</a></span><span class='out-of-band'><span id='render-detail'>
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
[<span class='inner'>−</span>]
</a>
</span><a class='srclink' href='../../src/futures/task_impl/mod.rs.html#215-219' title='goto source code'>[src]</a></span></h1>
<pre class='rust struct'>pub struct Spawn<T> { /* fields omitted */ }</pre><div class='docblock'><p>Representation of a spawned future/stream.</p>
<p>This object is returned by the <code>spawn</code> function in this module. This
represents a "fused task and future", storing all necessary pieces of a task
and owning the top-level future that's being driven as well.</p>
<p>A <code>Spawn</code> can be poll'd for completion or execution of the current thread
can be blocked indefinitely until a notification arrives. This can be used
with either futures or streams, with different methods being available on
<code>Spawn</code> depending which is used.</p>
</div><h2 id='methods'>Methods</h2><h3 class='impl'><span class='in-band'><code>impl<F: <a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a>> <a class="struct" href="../../futures/executor/struct.Spawn.html" title="struct futures::executor::Spawn">Spawn</a><F></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/std/mod.rs.html#225-296' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.poll_future' class="method"><span id='poll_future.v' class='invisible'><code>fn <a href='#method.poll_future' class='fnname'>poll_future</a>(&mut self, unpark: <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html" title="struct alloc::arc::Arc">Arc</a><<a class="trait" href="../../futures/executor/trait.Unpark.html" title="trait futures::executor::Unpark">Unpark</a>>) -> <a class="type" href="../../futures/type.Poll.html" title="type futures::Poll">Poll</a><F::<a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Item</a>, F::<a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Error</a>></code></span></h4>
<div class='stability'><div class='stab deprecated'>Deprecated<p>: recommended to use <code>poll_future_notify</code> instead</p>
</div></div><div class='docblock'><p>Polls the internal future, scheduling notifications to be sent to the
<code>unpark</code> argument.</p>
<p>This method will poll the internal future, testing if it's completed
yet. The <code>unpark</code> argument is used as a sink for notifications sent to
this future. That is, while the future is being polled, any call to
<code>task::park()</code> will return a handle that contains the <code>unpark</code>
specified.</p>
<p>If this function returns <code>NotReady</code>, then the <code>unpark</code> should have been
scheduled to receive a notification when poll can be called again.
Otherwise if <code>Ready</code> or <code>Err</code> is returned, the <code>Spawn</code> task can be
safely destroyed.</p>
</div><h4 id='method.wait_future' class="method"><span id='wait_future.v' class='invisible'><code>fn <a href='#method.wait_future' class='fnname'>wait_future</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><F::<a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Item</a>, F::<a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Error</a>></code></span></h4>
<div class='docblock'><p>Waits for the internal future to complete, blocking this thread's
execution until it does.</p>
<p>This function will call <code>poll_future</code> in a loop, waiting for the future
to complete. When a future cannot make progress it will use
<code>thread::park</code> to block the current thread.</p>
</div><h4 id='method.execute' class="method"><span id='execute.v' class='invisible'><code>fn <a href='#method.execute' class='fnname'>execute</a>(self, exec: <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html" title="struct alloc::arc::Arc">Arc</a><<a class="trait" href="../../futures/executor/trait.Executor.html" title="trait futures::executor::Executor">Executor</a>>) <span class="where fmt-newline">where<br> F: <a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a><Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">()</a>, Error = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">()</a>> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static, </span></code></span></h4>
<div class='docblock'><p>A specialized function to request running a future to completion on the
specified executor.</p>
<p>This function only works for futures whose item and error types are <code>()</code>
and also implement the <code>Send</code> and <code>'static</code> bounds. This will submit
units of work (instances of <code>Run</code>) to the <code>exec</code> argument provided
necessary to drive the future to completion.</p>
<p>When the future would block, it's arranged that when the future is again
ready it will submit another unit of work to the <code>exec</code> provided. This
will happen in a loop until the future has completed.</p>
<p>This method is not appropriate for all futures, and other kinds of
executors typically provide a similar function with perhaps relaxed
bounds as well.</p>
<p>Note that this method is likely to be deprecated in favor of the
<code>futures::Executor</code> trait and <code>execute</code> method, but if this'd cause
difficulty for you please let us know!</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<S: <a class="trait" href="../../futures/stream/trait.Stream.html" title="trait futures::stream::Stream">Stream</a>> <a class="struct" href="../../futures/executor/struct.Spawn.html" title="struct futures::executor::Spawn">Spawn</a><S></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/std/mod.rs.html#298-320' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.poll_stream' class="method"><span id='poll_stream.v' class='invisible'><code>fn <a href='#method.poll_stream' class='fnname'>poll_stream</a>(<br> &mut self, <br> unpark: <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html" title="struct alloc::arc::Arc">Arc</a><<a class="trait" href="../../futures/executor/trait.Unpark.html" title="trait futures::executor::Unpark">Unpark</a>><br>) -> <a class="type" href="../../futures/type.Poll.html" title="type futures::Poll">Poll</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><S::<a class="trait" href="../../futures/stream/trait.Stream.html" title="trait futures::stream::Stream">Item</a>>, S::<a class="trait" href="../../futures/stream/trait.Stream.html" title="trait futures::stream::Stream">Error</a>></code></span></h4>
<div class='stability'><div class='stab deprecated'>Deprecated<p>: recommended to use <code>poll_stream_notify</code> instead</p>
</div></div><div class='docblock'><p>Like <code>poll_future</code>, except polls the underlying stream.</p>
</div><h4 id='method.wait_stream' class="method"><span id='wait_stream.v' class='invisible'><code>fn <a href='#method.wait_stream' class='fnname'>wait_stream</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><S::<a class="trait" href="../../futures/stream/trait.Stream.html" title="trait futures::stream::Stream">Item</a>, S::<a class="trait" href="../../futures/stream/trait.Stream.html" title="trait futures::stream::Stream">Error</a>>></code></span></h4>
<div class='docblock'><p>Like <code>wait_future</code>, except only waits for the next element to arrive on
the underlying stream.</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<S: <a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">Sink</a>> <a class="struct" href="../../futures/executor/struct.Spawn.html" title="struct futures::executor::Spawn">Spawn</a><S></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/std/mod.rs.html#322-381' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.start_send' class="method"><span id='start_send.v' class='invisible'><code>fn <a href='#method.start_send' class='fnname'>start_send</a>(<br> &mut self, <br> value: S::<a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">SinkItem</a>, <br> unpark: &<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html" title="struct alloc::arc::Arc">Arc</a><<a class="trait" href="../../futures/executor/trait.Unpark.html" title="trait futures::executor::Unpark">Unpark</a>><br>) -> <a class="type" href="../../futures/type.StartSend.html" title="type futures::StartSend">StartSend</a><S::<a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">SinkItem</a>, S::<a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">SinkError</a>></code></span></h4>
<div class='stability'><div class='stab deprecated'>Deprecated<p>: recommended to use <code>start_send_notify</code> instead</p>
</div></div><div class='docblock'><p>Invokes the underlying <code>start_send</code> method with this task in place.</p>
<p>If the underlying operation returns <code>NotReady</code> then the <code>unpark</code> value
passed in will receive a notification when the operation is ready to be
attempted again.</p>
</div><h4 id='method.poll_flush' class="method"><span id='poll_flush.v' class='invisible'><code>fn <a href='#method.poll_flush' class='fnname'>poll_flush</a>(&mut self, unpark: &<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html" title="struct alloc::arc::Arc">Arc</a><<a class="trait" href="../../futures/executor/trait.Unpark.html" title="trait futures::executor::Unpark">Unpark</a>>) -> <a class="type" href="../../futures/type.Poll.html" title="type futures::Poll">Poll</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">()</a>, S::<a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">SinkError</a>></code></span></h4>
<div class='stability'><div class='stab deprecated'>Deprecated<p>: recommended to use <code>poll_flush_notify</code> instead</p>
</div></div><div class='docblock'><p>Invokes the underlying <code>poll_complete</code> method with this task in place.</p>
<p>If the underlying operation returns <code>NotReady</code> then the <code>unpark</code> value
passed in will receive a notification when the operation is ready to be
attempted again.</p>
</div><h4 id='method.wait_send' class="method"><span id='wait_send.v' class='invisible'><code>fn <a href='#method.wait_send' class='fnname'>wait_send</a>(&mut self, value: S::<a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">SinkItem</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.tuple.html">()</a>, S::<a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">SinkError</a>></code></span></h4>
<div class='docblock'><p>Blocks the current thread until it's able to send <code>value</code> on this sink.</p>
<p>This function will send the <code>value</code> on the sink that this task wraps. If
the sink is not ready to send the value yet then the current thread will
be blocked until it's able to send the value.</p>
</div><h4 id='method.wait_flush' class="method"><span id='wait_flush.v' class='invisible'><code>fn <a href='#method.wait_flush' class='fnname'>wait_flush</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.tuple.html">()</a>, S::<a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">SinkError</a>></code></span></h4>
<div class='docblock'><p>Blocks the current thread until it's able to flush this sink.</p>
<p>This function will call the underlying sink's <code>poll_complete</code> method
until it returns that it's ready, proxying out errors upwards to the
caller if one occurs.</p>
<p>The thread will be blocked until <code>poll_complete</code> returns that it's
ready.</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T> <a class="struct" href="../../futures/executor/struct.Spawn.html" title="struct futures::executor::Spawn">Spawn</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/mod.rs.html#238-253' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.get_ref' class="method"><span id='get_ref.v' class='invisible'><code>fn <a href='#method.get_ref' class='fnname'>get_ref</a>(&self) -> &T</code></span></h4>
<div class='docblock'><p>Get a shared reference to the object the Spawn is wrapping.</p>
</div><h4 id='method.get_mut' class="method"><span id='get_mut.v' class='invisible'><code>fn <a href='#method.get_mut' class='fnname'>get_mut</a>(&mut self) -> &mut T</code></span></h4>
<div class='docblock'><p>Get a mutable reference to the object the Spawn is wrapping.</p>
</div><h4 id='method.into_inner' class="method"><span id='into_inner.v' class='invisible'><code>fn <a href='#method.into_inner' class='fnname'>into_inner</a>(self) -> T</code></span></h4>
<div class='docblock'><p>Consume the Spawn, returning its inner object</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<F: <a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a>> <a class="struct" href="../../futures/executor/struct.Spawn.html" title="struct futures::executor::Spawn">Spawn</a><F></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/mod.rs.html#255-293' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.poll_future_notify' class="method"><span id='poll_future_notify.v' class='invisible'><code>fn <a href='#method.poll_future_notify' class='fnname'>poll_future_notify</a><T>(<br> &mut self, <br> notify: &T, <br> id: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a><br>) -> <a class="type" href="../../futures/type.Poll.html" title="type futures::Poll">Poll</a><F::<a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Item</a>, F::<a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Error</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="../../futures/executor/struct.NotifyHandle.html" title="struct futures::executor::NotifyHandle">NotifyHandle</a>>, </span></code></span></h4>
<div class='docblock'><p>Polls the internal future, scheduling notifications to be sent to the
<code>notify</code> argument.</p>
<p>This method will poll the internal future, testing if it's completed
yet. The <code>notify</code> argument is used as a sink for notifications sent to
this future. That is, while the future is being polled, any call to
<code>task::current()</code> will return a handle that contains the <code>notify</code>
specified.</p>
<p>If this function returns <code>NotReady</code>, then the <code>notify</code> should have been
scheduled to receive a notification when poll can be called again.
Otherwise if <code>Ready</code> or <code>Err</code> is returned, the <code>Spawn</code> task can be
safely destroyed.</p>
<p>Note that <code>notify</code> itself is passed as a shared reference, and is itself
not required to be a <code>NotifyHandle</code>. The <code>Clone</code> and <code>Into</code> trait bounds
will be used to convert this <code>notify</code> to a <code>NotifyHandle</code> if necessary.
This construction can avoid an unnecessary atomic reference count bump
in some situations.</p>
<h2 id="unsafety-and-id" class="section-header"><a href="#unsafety-and-id">Unsafety and <code>id</code></a></h2>
<p>This function and all other <code>*_notify</code> functions on this type will treat
the <code>id</code> specified very carefully, explicitly calling functions like the
<code>notify</code> argument's <code>clone_id</code> and <code>drop_id</code> functions. It should be
safe to encode a pointer itself into the <code>id</code> specified, such as an
<code>Arc<T></code> or a <code>Box<T></code>. The <code>clone_id</code> and <code>drop_id</code> functions are then
intended to be sufficient for the memory management related to that
pointer.</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<S: <a class="trait" href="../../futures/stream/trait.Stream.html" title="trait futures::stream::Stream">Stream</a>> <a class="struct" href="../../futures/executor/struct.Spawn.html" title="struct futures::executor::Spawn">Spawn</a><S></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/mod.rs.html#295-306' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.poll_stream_notify' class="method"><span id='poll_stream_notify.v' class='invisible'><code>fn <a href='#method.poll_stream_notify' class='fnname'>poll_stream_notify</a><T>(<br> &mut self, <br> notify: &T, <br> id: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a><br>) -> <a class="type" href="../../futures/type.Poll.html" title="type futures::Poll">Poll</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><S::<a class="trait" href="../../futures/stream/trait.Stream.html" title="trait futures::stream::Stream">Item</a>>, S::<a class="trait" href="../../futures/stream/trait.Stream.html" title="trait futures::stream::Stream">Error</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="../../futures/executor/struct.NotifyHandle.html" title="struct futures::executor::NotifyHandle">NotifyHandle</a>>, </span></code></span></h4>
<div class='docblock'><p>Like <code>poll_future_notify</code>, except polls the underlying stream.</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<S: <a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">Sink</a>> <a class="struct" href="../../futures/executor/struct.Spawn.html" title="struct futures::executor::Spawn">Spawn</a><S></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/mod.rs.html#308-339' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.start_send_notify' class="method"><span id='start_send_notify.v' class='invisible'><code>fn <a href='#method.start_send_notify' class='fnname'>start_send_notify</a><T>(<br> &mut self, <br> value: S::<a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">SinkItem</a>, <br> notify: &T, <br> id: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a><br>) -> <a class="type" href="../../futures/type.StartSend.html" title="type futures::StartSend">StartSend</a><S::<a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">SinkItem</a>, S::<a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">SinkError</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="../../futures/executor/struct.NotifyHandle.html" title="struct futures::executor::NotifyHandle">NotifyHandle</a>>, </span></code></span></h4>
<div class='docblock'><p>Invokes the underlying <code>start_send</code> method with this task in place.</p>
<p>If the underlying operation returns <code>NotReady</code> then the <code>notify</code> value
passed in will receive a notification when the operation is ready to be
attempted again.</p>
</div><h4 id='method.poll_flush_notify' class="method"><span id='poll_flush_notify.v' class='invisible'><code>fn <a href='#method.poll_flush_notify' class='fnname'>poll_flush_notify</a><T>(<br> &mut self, <br> notify: &T, <br> id: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a><br>) -> <a class="type" href="../../futures/type.Poll.html" title="type futures::Poll">Poll</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">()</a>, S::<a class="trait" href="../../futures/sink/trait.Sink.html" title="trait futures::sink::Sink">SinkError</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="../../futures/executor/struct.NotifyHandle.html" title="struct futures::executor::NotifyHandle">NotifyHandle</a>>, </span></code></span></h4>
<div class='docblock'><p>Invokes the underlying <code>poll_complete</code> method with this task in place.</p>
<p>If the underlying operation returns <code>NotReady</code> then the <code>notify</code> value
passed in will receive a notification when the operation is ready to be
attempted again.</p>
</div></div><h2 id='implementations'>Trait Implementations</h2><h3 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>> <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="../../futures/executor/struct.Spawn.html" title="struct futures::executor::Spawn">Spawn</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/mod.rs.html#356-362' title='goto source code'>[src]</a></span></h3>
<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, f: &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></h4>
<div class='docblock'><p>Formats the value using the given formatter.</p>
</div></div></section>
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