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305 lines
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<div class="sidebar-menu">☰</div>
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<p class='location'>Struct Builder</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.pool_size">pool_size</a><a href="#method.max_blocking">max_blocking</a><a href="#method.keep_alive">keep_alive</a><a href="#method.name_prefix">name_prefix</a><a href="#method.stack_size">stack_size</a><a href="#method.around_worker">around_worker</a><a href="#method.after_start">after_start</a><a href="#method.before_stop">before_stop</a><a href="#method.custom_park">custom_park</a><a href="#method.build">build</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a></div></div><p class='location'><a href='index.html'>tokio_threadpool</a></p><script>window.sidebarCurrent = {name: 'Builder', 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_threadpool</a>::<wbr><a class="struct" href=''>Builder</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_threadpool/builder.rs.html#58-71' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct Builder { /* fields omitted */ }</pre><div class='docblock'><p>Builds a thread pool with custom configuration values.</p>
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<p>Methods can be chained in order to set the configuration values. The thread
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pool is constructed by calling <a href="#method.build"><code>build</code></a>.</p>
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<p>New instances of <code>Builder</code> are obtained via <a href="#method.new"><code>Builder::new</code></a>.</p>
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<p>See function level documentation for details on the various configuration
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settings.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">futures</span>::<span class="ident">future</span>::{<span class="ident">Future</span>, <span class="ident">lazy</span>};
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::<span class="ident">Duration</span>;
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<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>()
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.<span class="ident">pool_size</span>(<span class="number">4</span>)
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.<span class="ident">keep_alive</span>(<span class="prelude-val">Some</span>(<span class="ident">Duration</span>::<span class="ident">from_secs</span>(<span class="number">30</span>)))
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.<span class="ident">build</span>();
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<span class="ident">thread_pool</span>.<span class="ident">spawn</span>(<span class="ident">lazy</span>(<span class="op">||</span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"called from a worker thread"</span>);
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<span class="prelude-val">Ok</span>(())
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}));
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<span class="comment">// Gracefully shutdown the threadpool</span>
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<span class="ident">thread_pool</span>.<span class="ident">shutdown</span>().<span class="ident">wait</span>().<span class="ident">unwrap</span>();</pre>
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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_threadpool/struct.Builder.html" title="struct tokio_threadpool::Builder">Builder</a></code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/builder.rs.html#73-427' 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_threadpool/struct.Builder.html" title="struct tokio_threadpool::Builder">Builder</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/builder.rs.html#94-115' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Returns a new thread pool builder initialized with default configuration
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values.</p>
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<p>Configuration methods can be chained on the return value.</p>
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<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::<span class="ident">Duration</span>;
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<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>()
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.<span class="ident">pool_size</span>(<span class="number">4</span>)
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.<span class="ident">keep_alive</span>(<span class="prelude-val">Some</span>(<span class="ident">Duration</span>::<span class="ident">from_secs</span>(<span class="number">30</span>)))
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.<span class="ident">build</span>();</pre>
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</div><h4 id='method.pool_size' class="method"><span id='pool_size.v' class='invisible'><code>pub fn <a href='#method.pool_size' class='fnname'>pool_size</a>(&mut self, val: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/builder.rs.html#137-143' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Set the maximum number of worker threads for the thread pool instance.</p>
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<p>This must be a number between 1 and 32,768 though it is advised to keep
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this value on the smaller side.</p>
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<p>The default value is the number of cores available to the system.</p>
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<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>()
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.<span class="ident">pool_size</span>(<span class="number">4</span>)
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.<span class="ident">build</span>();</pre>
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</div><h4 id='method.max_blocking' class="method"><span id='max_blocking.v' class='invisible'><code>pub fn <a href='#method.max_blocking' class='fnname'>max_blocking</a>(&mut self, val: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/builder.rs.html#169-173' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Set the maximum number of concurrent blocking sections.</p>
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<p>When the maximum concurrent <code>blocking</code> calls is reached, any further
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calls to <code>blocking</code> will return <code>NotReady</code> and the task is notified once
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previously in-flight calls to <code>blocking</code> return.</p>
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<p>This must be a number between 1 and 32,768 though it is advised to keep
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this value on the smaller side.</p>
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<p>The default value is 100.</p>
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<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>()
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.<span class="ident">max_blocking</span>(<span class="number">200</span>)
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.<span class="ident">build</span>();</pre>
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</div><h4 id='method.keep_alive' class="method"><span id='keep_alive.v' class='invisible'><code>pub fn <a href='#method.keep_alive' class='fnname'>keep_alive</a>(&mut self, val: <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="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/builder.rs.html#200-203' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Set the worker thread keep alive duration</p>
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<p>If set, a worker thread will wait for up to the specified duration for
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work, at which point the thread will shutdown. When work becomes
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available, a new thread will eventually be spawned to replace the one
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that shut down.</p>
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<p>When the value is <code>None</code>, the thread will wait for work forever.</p>
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<p>The default value is <code>None</code>.</p>
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<h1 id="examples-4" class="section-header"><a href="#examples-4">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::<span class="ident">Duration</span>;
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|
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|||
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<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>()
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.<span class="ident">keep_alive</span>(<span class="prelude-val">Some</span>(<span class="ident">Duration</span>::<span class="ident">from_secs</span>(<span class="number">30</span>)))
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.<span class="ident">build</span>();</pre>
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</div><h4 id='method.name_prefix' class="method"><span id='name_prefix.v' class='invisible'><code>pub fn <a href='#method.name_prefix' class='fnname'>name_prefix</a><S: <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="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>>>(&mut self, val: S) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/builder.rs.html#227-230' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Set name prefix of threads spawned by the scheduler</p>
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<p>Thread name prefix is used for generating thread names. For example, if
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prefix is <code>my-pool-</code>, then threads in the pool will get names like
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<code>my-pool-1</code> etc.</p>
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<p>If this configuration is not set, then the thread will use the system
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default naming scheme.</p>
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<h1 id="examples-5" class="section-header"><a href="#examples-5">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>()
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.<span class="ident">name_prefix</span>(<span class="string">"my-pool-"</span>)
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.<span class="ident">build</span>();</pre>
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</div><h4 id='method.stack_size' class="method"><span id='stack_size.v' class='invisible'><code>pub fn <a href='#method.stack_size' class='fnname'>stack_size</a>(&mut self, val: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/builder.rs.html#253-256' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Set the stack size (in bytes) for worker threads.</p>
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<p>The actual stack size may be greater than this value if the platform
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specifies minimal stack size.</p>
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<p>The default stack size for spawned threads is 2 MiB, though this
|
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particular stack size is subject to change in the future.</p>
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<h1 id="examples-6" class="section-header"><a href="#examples-6">Examples</a></h1>
|
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<pre class="rust rust-example-rendered">
|
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|
|
|
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<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>()
|
|||
|
|
.<span class="ident">stack_size</span>(<span class="number">32</span> <span class="op">*</span> <span class="number">1024</span>)
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|||
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.<span class="ident">build</span>();</pre>
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</div><h4 id='method.around_worker' class="method"><span id='around_worker.v' class='invisible'><code>pub fn <a href='#method.around_worker' class='fnname'>around_worker</a><F>(&mut self, f: F) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(&<a class="struct" href="../tokio_threadpool/struct.Worker.html" title="struct tokio_threadpool::Worker">Worker</a>, &mut <a class="struct" href="../tokio_executor/enter/struct.Enter.html" title="struct tokio_executor::enter::Enter">Enter</a>) + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/builder.rs.html#283-288' title='goto source code'>[src]</a></span></h4>
|
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<div class='docblock'><p>Execute function <code>f</code> on each worker thread.</p>
|
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<p>This function is provided a handle to the worker and is expected to call
|
|||
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<a href="struct.Worker.html#method.run"><code>Worker::run</code></a>, otherwise the worker thread will shutdown without doing
|
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any work.</p>
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<h1 id="examples-7" class="section-header"><a href="#examples-7">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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|
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<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>()
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.<span class="ident">around_worker</span>(<span class="op">|</span><span class="ident">worker</span>, _<span class="op">|</span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"worker is starting up"</span>);
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<span class="ident">worker</span>.<span class="ident">run</span>();
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"worker is shutting down"</span>);
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})
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.<span class="ident">build</span>();</pre>
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</div><h4 id='method.after_start' class="method"><span id='after_start.v' class='invisible'><code>pub fn <a href='#method.after_start' class='fnname'>after_start</a><F>(&mut self, f: F) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>() + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/builder.rs.html#310-315' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<div class='docblock'><p>Execute function <code>f</code> after each thread is started but before it starts
|
|||
|
|
doing work.</p>
|
|||
|
|
<p>This is intended for bookkeeping and monitoring use cases.</p>
|
|||
|
|
<h1 id="examples-8" class="section-header"><a href="#examples-8">Examples</a></h1>
|
|||
|
|
<pre class="rust rust-example-rendered">
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>()
|
|||
|
|
.<span class="ident">after_start</span>(<span class="op">||</span> {
|
|||
|
|
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"thread started"</span>);
|
|||
|
|
})
|
|||
|
|
.<span class="ident">build</span>();</pre>
|
|||
|
|
</div><h4 id='method.before_stop' class="method"><span id='before_stop.v' class='invisible'><code>pub fn <a href='#method.before_stop' class='fnname'>before_stop</a><F>(&mut self, f: F) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>() + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/builder.rs.html#336-341' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<div class='docblock'><p>Execute function <code>f</code> before each thread stops.</p>
|
|||
|
|
<p>This is intended for bookkeeping and monitoring use cases.</p>
|
|||
|
|
<h1 id="examples-9" class="section-header"><a href="#examples-9">Examples</a></h1>
|
|||
|
|
<pre class="rust rust-example-rendered">
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>()
|
|||
|
|
.<span class="ident">before_stop</span>(<span class="op">||</span> {
|
|||
|
|
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"thread stopping"</span>);
|
|||
|
|
})
|
|||
|
|
.<span class="ident">build</span>();</pre>
|
|||
|
|
</div><h4 id='method.custom_park' class="method"><span id='custom_park.v' class='invisible'><code>pub fn <a href='#method.custom_park' class='fnname'>custom_park</a><F, P>(&mut self, f: F) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(&<a class="struct" href="../tokio_threadpool/struct.WorkerId.html" title="struct tokio_threadpool::WorkerId">WorkerId</a>) -> P + 'static,<br> P: <a class="trait" href="../tokio_executor/park/trait.Park.html" title="trait tokio_executor::park::Park">Park</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static,<br> P::<a class="type" href="../tokio_executor/park/trait.Park.html#associatedtype.Error" title="type tokio_executor::park::Park::Error">Error</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/builder.rs.html#372-382' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<div class='docblock'><p>Customize the <code>park</code> instance used by each worker thread.</p>
|
|||
|
|
<p>The provided closure <code>f</code> is called once per worker and returns a <code>Park</code>
|
|||
|
|
instance that is used by the worker to put itself to sleep.</p>
|
|||
|
|
<h1 id="examples-10" class="section-header"><a href="#examples-10">Examples</a></h1>
|
|||
|
|
<pre class="rust rust-example-rendered">
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>()
|
|||
|
|
.<span class="ident">custom_park</span>(<span class="op">|</span>_<span class="op">|</span> {
|
|||
|
|
<span class="kw">use</span> <span class="ident">tokio_threadpool</span>::<span class="ident">park</span>::<span class="ident">DefaultPark</span>;
|
|||
|
|
|
|||
|
|
<span class="comment">// This is the default park type that the worker would use if we</span>
|
|||
|
|
<span class="comment">// did not customize it.</span>
|
|||
|
|
<span class="kw">let</span> <span class="ident">park</span> <span class="op">=</span> <span class="ident">DefaultPark</span>::<span class="ident">new</span>();
|
|||
|
|
|
|||
|
|
<span class="comment">// Decorate the `park` instance, allowing us to customize work</span>
|
|||
|
|
<span class="comment">// that happens when a worker thread goes to sleep.</span>
|
|||
|
|
<span class="ident">decorate</span>(<span class="ident">park</span>)
|
|||
|
|
})
|
|||
|
|
.<span class="ident">build</span>();</pre>
|
|||
|
|
</div><h4 id='method.build' class="method"><span id='build.v' class='invisible'><code>pub fn <a href='#method.build' class='fnname'>build</a>(&self) -> <a class="struct" href="../tokio_threadpool/struct.ThreadPool.html" title="struct tokio_threadpool::ThreadPool">ThreadPool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/builder.rs.html#400-426' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<div class='docblock'><p>Create the configured <code>ThreadPool</code>.</p>
|
|||
|
|
<p>The returned <code>ThreadPool</code> instance is ready to spawn tasks.</p>
|
|||
|
|
<h1 id="examples-11" class="section-header"><a href="#examples-11">Examples</a></h1>
|
|||
|
|
<pre class="rust rust-example-rendered">
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">Builder</span>::<span class="ident">new</span>()
|
|||
|
|
.<span class="ident">build</span>();</pre>
|
|||
|
|
</div></div>
|
|||
|
|
<h2 id='implementations' class='small-section-header'>
|
|||
|
|
Trait Implementations<a href='#implementations' class='anchor'></a>
|
|||
|
|
</h2>
|
|||
|
|
<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_threadpool/struct.Builder.html" title="struct tokio_threadpool::Builder">Builder</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_threadpool/builder.rs.html#429-437' 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, fmt: &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_threadpool/builder.rs.html#430-436' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<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>
|
|||
|
|
</div></div></section>
|
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Prefix searches with a type followed by a colon (e.g.
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Accepted types are: <code>fn</code>, <code>mod</code>,
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and <code>const</code>.
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Search functions by type signature (e.g.
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