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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.28.2/src/runtime/task/raw.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>raw.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../../normalize.css"><link rel="stylesheet" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../dark.css" disabled><link rel="stylesheet" href="../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../storage.js"></script><script defer src="../../../../source-script.js"></script><script defer src="../../../../source-files.js"></script><script defer src="../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../tokio/index.html"><div class="logo-container"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../../tokio/index.html"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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</pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::future::Future;
<span class="kw">use </span><span class="kw">crate</span>::runtime::task::core::{Core, Trailer};
<span class="kw">use </span><span class="kw">crate</span>::runtime::task::{Cell, Harness, Header, Id, Schedule, State};
<span class="kw">use </span>std::ptr::NonNull;
<span class="kw">use </span>std::task::{Poll, Waker};
<span class="doccomment">/// Raw task handle
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>RawTask {
ptr: NonNull&lt;Header&gt;,
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Vtable {
<span class="doccomment">/// Polls the future.
</span><span class="kw">pub</span>(<span class="kw">super</span>) poll: <span class="kw">unsafe fn</span>(NonNull&lt;Header&gt;),
<span class="doccomment">/// Schedules the task for execution on the runtime.
</span><span class="kw">pub</span>(<span class="kw">super</span>) schedule: <span class="kw">unsafe fn</span>(NonNull&lt;Header&gt;),
<span class="doccomment">/// Deallocates the memory.
</span><span class="kw">pub</span>(<span class="kw">super</span>) dealloc: <span class="kw">unsafe fn</span>(NonNull&lt;Header&gt;),
<span class="doccomment">/// Reads the task output, if complete.
</span><span class="kw">pub</span>(<span class="kw">super</span>) try_read_output: <span class="kw">unsafe fn</span>(NonNull&lt;Header&gt;, <span class="kw-2">*mut </span>(), <span class="kw-2">&amp;</span>Waker),
<span class="doccomment">/// The join handle has been dropped.
</span><span class="kw">pub</span>(<span class="kw">super</span>) drop_join_handle_slow: <span class="kw">unsafe fn</span>(NonNull&lt;Header&gt;),
<span class="doccomment">/// An abort handle has been dropped.
</span><span class="kw">pub</span>(<span class="kw">super</span>) drop_abort_handle: <span class="kw">unsafe fn</span>(NonNull&lt;Header&gt;),
<span class="doccomment">/// Scheduler is being shutdown.
</span><span class="kw">pub</span>(<span class="kw">super</span>) shutdown: <span class="kw">unsafe fn</span>(NonNull&lt;Header&gt;),
<span class="doccomment">/// The number of bytes that the `trailer` field is offset from the header.
</span><span class="kw">pub</span>(<span class="kw">super</span>) trailer_offset: usize,
<span class="doccomment">/// The number of bytes that the `scheduler` field is offset from the header.
</span><span class="kw">pub</span>(<span class="kw">super</span>) scheduler_offset: usize,
<span class="doccomment">/// The number of bytes that the `id` field is offset from the header.
</span><span class="kw">pub</span>(<span class="kw">super</span>) id_offset: usize,
}
<span class="doccomment">/// Get the vtable for the requested `T` and `S` generics.
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>vtable&lt;T: Future, S: Schedule&gt;() -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Vtable {
<span class="kw-2">&amp;</span>Vtable {
poll: poll::&lt;T, S&gt;,
schedule: schedule::&lt;S&gt;,
dealloc: dealloc::&lt;T, S&gt;,
try_read_output: try_read_output::&lt;T, S&gt;,
drop_join_handle_slow: drop_join_handle_slow::&lt;T, S&gt;,
drop_abort_handle: drop_abort_handle::&lt;T, S&gt;,
shutdown: shutdown::&lt;T, S&gt;,
trailer_offset: OffsetHelper::&lt;T, S&gt;::TRAILER_OFFSET,
scheduler_offset: OffsetHelper::&lt;T, S&gt;::SCHEDULER_OFFSET,
id_offset: OffsetHelper::&lt;T, S&gt;::ID_OFFSET,
}
}
<span class="doccomment">/// Calling `get_trailer_offset` directly in vtable doesn&#39;t work because it
/// prevents the vtable from being promoted to a static reference.
///
/// See this thread for more info:
/// &lt;https://users.rust-lang.org/t/custom-vtables-with-integers/78508&gt;
</span><span class="kw">struct </span>OffsetHelper&lt;T, S&gt;(T, S);
<span class="kw">impl</span>&lt;T: Future, S: Schedule&gt; OffsetHelper&lt;T, S&gt; {
<span class="comment">// Pass `size_of`/`align_of` as arguments rather than calling them directly
// inside `get_trailer_offset` because trait bounds on generic parameters
// of const fn are unstable on our MSRV.
</span><span class="kw">const </span>TRAILER_OFFSET: usize = get_trailer_offset(
std::mem::size_of::&lt;Header&gt;(),
std::mem::size_of::&lt;Core&lt;T, S&gt;&gt;(),
std::mem::align_of::&lt;Core&lt;T, S&gt;&gt;(),
std::mem::align_of::&lt;Trailer&gt;(),
);
<span class="comment">// The `scheduler` is the first field of `Core`, so it has the same
// offset as `Core`.
</span><span class="kw">const </span>SCHEDULER_OFFSET: usize = get_core_offset(
std::mem::size_of::&lt;Header&gt;(),
std::mem::align_of::&lt;Core&lt;T, S&gt;&gt;(),
);
<span class="kw">const </span>ID_OFFSET: usize = get_id_offset(
std::mem::size_of::&lt;Header&gt;(),
std::mem::align_of::&lt;Core&lt;T, S&gt;&gt;(),
std::mem::size_of::&lt;S&gt;(),
std::mem::align_of::&lt;Id&gt;(),
);
}
<span class="doccomment">/// Compute the offset of the `Trailer` field in `Cell&lt;T, S&gt;` using the
/// `#[repr(C)]` algorithm.
///
/// Pseudo-code for the `#[repr(C)]` algorithm can be found here:
/// &lt;https://doc.rust-lang.org/reference/type-layout.html#reprc-structs&gt;
</span><span class="kw">const fn </span>get_trailer_offset(
header_size: usize,
core_size: usize,
core_align: usize,
trailer_align: usize,
) -&gt; usize {
<span class="kw">let </span><span class="kw-2">mut </span>offset = header_size;
<span class="kw">let </span>core_misalign = offset % core_align;
<span class="kw">if </span>core_misalign &gt; <span class="number">0 </span>{
offset += core_align - core_misalign;
}
offset += core_size;
<span class="kw">let </span>trailer_misalign = offset % trailer_align;
<span class="kw">if </span>trailer_misalign &gt; <span class="number">0 </span>{
offset += trailer_align - trailer_misalign;
}
offset
}
<span class="doccomment">/// Compute the offset of the `Core&lt;T, S&gt;` field in `Cell&lt;T, S&gt;` using the
/// `#[repr(C)]` algorithm.
///
/// Pseudo-code for the `#[repr(C)]` algorithm can be found here:
/// &lt;https://doc.rust-lang.org/reference/type-layout.html#reprc-structs&gt;
</span><span class="kw">const fn </span>get_core_offset(header_size: usize, core_align: usize) -&gt; usize {
<span class="kw">let </span><span class="kw-2">mut </span>offset = header_size;
<span class="kw">let </span>core_misalign = offset % core_align;
<span class="kw">if </span>core_misalign &gt; <span class="number">0 </span>{
offset += core_align - core_misalign;
}
offset
}
<span class="doccomment">/// Compute the offset of the `Id` field in `Cell&lt;T, S&gt;` using the
/// `#[repr(C)]` algorithm.
///
/// Pseudo-code for the `#[repr(C)]` algorithm can be found here:
/// &lt;https://doc.rust-lang.org/reference/type-layout.html#reprc-structs&gt;
</span><span class="kw">const fn </span>get_id_offset(
header_size: usize,
core_align: usize,
scheduler_size: usize,
id_align: usize,
) -&gt; usize {
<span class="kw">let </span><span class="kw-2">mut </span>offset = get_core_offset(header_size, core_align);
offset += scheduler_size;
<span class="kw">let </span>id_misalign = offset % id_align;
<span class="kw">if </span>id_misalign &gt; <span class="number">0 </span>{
offset += id_align - id_misalign;
}
offset
}
<span class="kw">impl </span>RawTask {
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new&lt;T, S&gt;(task: T, scheduler: S, id: Id) -&gt; RawTask
<span class="kw">where
</span>T: Future,
S: Schedule,
{
<span class="kw">let </span>ptr = Box::into_raw(Cell::&lt;<span class="kw">_</span>, S&gt;::new(task, scheduler, State::new(), id));
<span class="kw">let </span>ptr = <span class="kw">unsafe </span>{ NonNull::new_unchecked(ptr <span class="kw">as </span><span class="kw-2">*mut </span>Header) };
RawTask { ptr }
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>from_raw(ptr: NonNull&lt;Header&gt;) -&gt; RawTask {
RawTask { ptr }
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>header_ptr(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; NonNull&lt;Header&gt; {
<span class="self">self</span>.ptr
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>trailer_ptr(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; NonNull&lt;Trailer&gt; {
<span class="kw">unsafe </span>{ Header::get_trailer(<span class="self">self</span>.ptr) }
}
<span class="doccomment">/// Returns a reference to the task&#39;s header.
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>header(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>Header {
<span class="kw">unsafe </span>{ <span class="self">self</span>.ptr.as_ref() }
}
<span class="doccomment">/// Returns a reference to the task&#39;s trailer.
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>trailer(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>Trailer {
<span class="kw">unsafe </span>{ <span class="kw-2">&amp;*</span><span class="self">self</span>.trailer_ptr().as_ptr() }
}
<span class="doccomment">/// Returns a reference to the task&#39;s state.
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>state(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>State {
<span class="kw-2">&amp;</span><span class="self">self</span>.header().state
}
<span class="doccomment">/// Safety: mutual exclusion is required to call this function.
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>poll(<span class="self">self</span>) {
<span class="kw">let </span>vtable = <span class="self">self</span>.header().vtable;
<span class="kw">unsafe </span>{ (vtable.poll)(<span class="self">self</span>.ptr) }
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>schedule(<span class="self">self</span>) {
<span class="kw">let </span>vtable = <span class="self">self</span>.header().vtable;
<span class="kw">unsafe </span>{ (vtable.schedule)(<span class="self">self</span>.ptr) }
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>dealloc(<span class="self">self</span>) {
<span class="kw">let </span>vtable = <span class="self">self</span>.header().vtable;
<span class="kw">unsafe </span>{
(vtable.dealloc)(<span class="self">self</span>.ptr);
}
}
<span class="doccomment">/// Safety: `dst` must be a `*mut Poll&lt;super::Result&lt;T::Output&gt;&gt;` where `T`
/// is the future stored by the task.
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>try_read_output(<span class="self">self</span>, dst: <span class="kw-2">*mut </span>(), waker: <span class="kw-2">&amp;</span>Waker) {
<span class="kw">let </span>vtable = <span class="self">self</span>.header().vtable;
(vtable.try_read_output)(<span class="self">self</span>.ptr, dst, waker);
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>drop_join_handle_slow(<span class="self">self</span>) {
<span class="kw">let </span>vtable = <span class="self">self</span>.header().vtable;
<span class="kw">unsafe </span>{ (vtable.drop_join_handle_slow)(<span class="self">self</span>.ptr) }
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>drop_abort_handle(<span class="self">self</span>) {
<span class="kw">let </span>vtable = <span class="self">self</span>.header().vtable;
<span class="kw">unsafe </span>{ (vtable.drop_abort_handle)(<span class="self">self</span>.ptr) }
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>shutdown(<span class="self">self</span>) {
<span class="kw">let </span>vtable = <span class="self">self</span>.header().vtable;
<span class="kw">unsafe </span>{ (vtable.shutdown)(<span class="self">self</span>.ptr) }
}
<span class="doccomment">/// Increment the task&#39;s reference count.
///
/// Currently, this is used only when creating an `AbortHandle`.
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>ref_inc(<span class="self">self</span>) {
<span class="self">self</span>.header().state.ref_inc();
}
}
<span class="kw">impl </span>Clone <span class="kw">for </span>RawTask {
<span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
RawTask { ptr: <span class="self">self</span>.ptr }
}
}
<span class="kw">impl </span>Copy <span class="kw">for </span>RawTask {}
<span class="kw">unsafe fn </span>poll&lt;T: Future, S: Schedule&gt;(ptr: NonNull&lt;Header&gt;) {
<span class="kw">let </span>harness = Harness::&lt;T, S&gt;::from_raw(ptr);
harness.poll();
}
<span class="kw">unsafe fn </span>schedule&lt;S: Schedule&gt;(ptr: NonNull&lt;Header&gt;) {
<span class="kw">use </span><span class="kw">crate</span>::runtime::task::{Notified, Task};
<span class="kw">let </span>scheduler = Header::get_scheduler::&lt;S&gt;(ptr);
scheduler
.as_ref()
.schedule(Notified(Task::from_raw(ptr.cast())));
}
<span class="kw">unsafe fn </span>dealloc&lt;T: Future, S: Schedule&gt;(ptr: NonNull&lt;Header&gt;) {
<span class="kw">let </span>harness = Harness::&lt;T, S&gt;::from_raw(ptr);
harness.dealloc();
}
<span class="kw">unsafe fn </span>try_read_output&lt;T: Future, S: Schedule&gt;(
ptr: NonNull&lt;Header&gt;,
dst: <span class="kw-2">*mut </span>(),
waker: <span class="kw-2">&amp;</span>Waker,
) {
<span class="kw">let </span>out = <span class="kw-2">&amp;mut *</span>(dst <span class="kw">as </span><span class="kw-2">*mut </span>Poll&lt;<span class="kw">super</span>::Result&lt;T::Output&gt;&gt;);
<span class="kw">let </span>harness = Harness::&lt;T, S&gt;::from_raw(ptr);
harness.try_read_output(out, waker);
}
<span class="kw">unsafe fn </span>drop_join_handle_slow&lt;T: Future, S: Schedule&gt;(ptr: NonNull&lt;Header&gt;) {
<span class="kw">let </span>harness = Harness::&lt;T, S&gt;::from_raw(ptr);
harness.drop_join_handle_slow()
}
<span class="kw">unsafe fn </span>drop_abort_handle&lt;T: Future, S: Schedule&gt;(ptr: NonNull&lt;Header&gt;) {
<span class="kw">let </span>harness = Harness::&lt;T, S&gt;::from_raw(ptr);
harness.drop_reference();
}
<span class="kw">unsafe fn </span>shutdown&lt;T: Future, S: Schedule&gt;(ptr: NonNull&lt;Header&gt;) {
<span class="kw">let </span>harness = Harness::&lt;T, S&gt;::from_raw(ptr);
harness.shutdown()
}
</code></pre></div>
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