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For #40221 For #56661 For #57928 Change-Id: Iaf7425bb26eeb9c23235d13c786d5bb572159481 Reviewed-on: https://go-review.googlesource.com/c/go/+/486535 Run-TryBot: Damien Neil <dneil@google.com> Reviewed-by: Sameer Ajmani <sameer@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org>
119 lines
3.3 KiB
HTML
119 lines
3.3 KiB
HTML
<!--{
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"Title": "Go 1.21 Release Notes",
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"Path": "/doc/go1.21"
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}-->
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<!--
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NOTE: In this document and others in this directory, the convention is to
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set fixed-width phrases with non-fixed-width spaces, as in
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<code>hello</code> <code>world</code>.
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Do not send CLs removing the interior tags from such phrases.
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-->
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<style>
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main ul li { margin: 0.5em 0; }
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</style>
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<h2 id="introduction">DRAFT RELEASE NOTES — Introduction to Go 1.21</h2>
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<p>
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<strong>
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Go 1.21 is not yet released. These are work-in-progress
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release notes. Go 1.21 is expected to be released in August 2023.
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</strong>
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</p>
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<h2 id="language">Changes to the language</h2>
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<p>
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TODO: complete this section
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</p>
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<h2 id="ports">Ports</h2>
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<p>
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TODO: complete this section, or delete if not needed
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</p>
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<h2 id="tools">Tools</h2>
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<h3 id="go-command">Go command</h3>
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<p>
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TODO: complete this section, or delete if not needed
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</p>
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<h2 id="runtime">Runtime</h2>
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<p>
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TODO: complete this section, or delete if not needed
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</p>
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<p><!-- https://go.dev/issue/7181 -->
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When printing very deep stacks, the runtime now prints the first 50
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(innermost) frames followed by the bottom 50 (outermost) frames,
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rather than just printing the first 100 frames. This makes it easier
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to see how deeply recursive stacks started, and is especially
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valuable for debugging stack overflows.
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</p>
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<h2 id="compiler">Compiler</h2>
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<p>
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TODO: complete this section, or delete if not needed
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</p>
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<h2 id="linker">Linker</h2>
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<p>
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TODO: complete this section, or delete if not needed
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</p>
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<h2 id="library">Core library</h2>
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<h3 id="minor_library_changes">Minor changes to the library</h3>
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<p>
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As always, there are various minor changes and updates to the library,
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made with the Go 1 <a href="/doc/go1compat">promise of compatibility</a>
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in mind.
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There are also various performance improvements, not enumerated here.
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</p>
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<p>
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TODO: complete this section
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</p>
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<dl id="context"><dt><a href="/pkg/context/">sync</a></dt>
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<dd>
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<p><!-- https://go.dev/issue/40221, CL 479918 -->
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The new <a href="/pkg/context/#WithoutCancel"><code>WithoutCancel</code></a>
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function returns a copy of a context that is not canceled when the original
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context is canceled.
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</p>
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<p><!-- https://go.dev/issue/56661, CL 449318 -->
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The new <a href="/pkg/context/#WithDeadlineCause"><code>WithDeadlineCause</code></a>
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and <a href="/pkg/context/#WithTimeoutCause"><code>WithTimeoutCause</code></a>
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functions provide a way to set a context cancellation cause when a deadline or
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timer expires. The cause may be retrieved with the
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<a href="/pkg/context/#Cause"><code>Cause</code></a> function.
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</p>
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<p><!-- https://go.dev/issue/57928, CL 482695 -->
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The new <a href="/pkg/context/#AfterFunc"><code>AfterFunc</code></a>
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function registers a function to run after a context has been cancelled.
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</p>
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</dd>
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</dl>
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<dl id="sync"><dt><a href="/pkg/sync/">sync</a></dt>
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<dd>
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<p><!-- https://go.dev/issue/56102, CL 451356 -->
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The new <a href="/pkg/sync/#OnceFunc"><code>OnceFunc</code></a>,
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<a href="/pkg/sync/#OnceValue"><code>OnceValue</code></a>, and
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<a href="/pkg/sync/#OnceValues"><code>OnceValues</code></a>
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functions capture a common use of <a href="/pkg/sync/#Once">Once</a> to
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lazily initialize a value on first use.
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</p>
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</dd>
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</dl>
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