Also mention errors that implement it.
For #41198
Change-Id: I4f01b112f53b19e2494b701bb012cb2cb52f8962
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For #57436
Change-Id: I99e8b0819c76f1ccf12154a894c9c4c9d68124d4
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For #56539
For #59166
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Also move all the language changes to the same part of the release notes.
For #56351
For #57411
Change-Id: Id1c51b5eb8f7d85e61a2ae44ee7d73bb13036631
Reviewed-on: https://go-review.googlesource.com/c/go/+/498755
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Also mention WTF-8 support in the syscall package.
For #32558
For #58977
For #59971
Change-Id: Id1627889b5e498add498748d9bfc69fb58030b35
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Added Value.Clear, deprecated SliceHeader and StringHeader.
For #55002
For #56906
Change-Id: Ib7497aff830d56fad90c31ec28596e71a448e9ce
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For #46159
Change-Id: Ia9cc0827a89d362532d1a662b791de8eebbfb2fe
Reviewed-on: https://go-review.googlesource.com/c/go/+/498756
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Remove x/ repos changes that aren't part of the 1.21 release.
Change-Id: Ia5cbf02ed6c0cc4dc0ff80d68403723b3f9ae0ba
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One of the changes also affects the os package, so mention it
there too.
For #46259
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Add a short release note blurb on linker dead-coding of global map
variables.
Updates #58645.
Change-Id: Ibfdd3e2b2b78517db4245b1d7eedd5e75a643b47
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For #37708
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For #44855
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For #59488.
Change-Id: Iefabb06014767c5f633082a112a81e9ff5f09a30
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For #57348
Change-Id: I84943711b033d63f0993133f93d9f09ce2af5965
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This includes release notes for several small runtime changes, including
runtime/trace and runtime package changes.
For #58645.
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Generated with relnote. I did my best to put things where they made
sense, but some weren't obvious, like the Unicode upgrade and backward
compatibility stuff.
For #58645.
Change-Id: Ic3cd9ef32cec7591ace4d2df1da40e4afd97d083
Reviewed-on: https://go-review.googlesource.com/c/go/+/496316
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Fix formatting mistakes in my previous CLs -- a missing code tag
and a broken comment tag.
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With CL 408826, CL 413474, etc. reflect.ValueOf no longer
unconditionally escapes its argument, allowing a Value's content
to be allocated on the stack.
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This adds the three functions from #56102 to the sync package. These
provide a convenient API for the most common uses of sync.Once.
The performance of these is comparable to direct use of sync.Once:
$ go test -run ^$ -bench OnceFunc\|OnceVal -count 20 | benchstat -row .name -col /v
goos: linux
goarch: amd64
pkg: sync
cpu: 11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz
│ Once │ Global │ Local │
│ sec/op │ sec/op vs base │ sec/op vs base │
OnceFunc 1.3500n ± 6% 2.7030n ± 1% +100.22% (p=0.000 n=20) 0.3935n ± 0% -70.86% (p=0.000 n=20)
OnceValue 1.3155n ± 0% 2.7460n ± 1% +108.74% (p=0.000 n=20) 0.5478n ± 1% -58.35% (p=0.000 n=20)
The "Once" column represents the baseline of how code would typically
express these patterns using sync.Once. "Global" binds the closure
returned by OnceFunc/OnceValue to global, which is how I expect these
to be used most of the time. Currently, this defeats some inlining
opportunities, which roughly doubles the cost over sync.Once; however,
it's still *extremely* fast. Finally, "Local" binds the returned
closure to a local variable. This unlocks several levels of inlining
and represents pretty much the best possible case for these APIs, but
is also unlikely to happen in practice. In principle the compiler
could recognize that the global in the "Global" case is initialized in
place and never mutated and do the same optimizations it does in the
"Local" case, but it currently does not.
Fixes#56102
Change-Id: If7355eccd7c8de7288d89a4282ff15ab1469e420
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This is relatively easy using the new traceback iterator.
Ancestor tracebacks are now limited to 50 frames. We could keep that
at 100, but the fact that it used 100 before seemed arbitrary and
unnecessary.
Fixes#7181
Updates #54466
Change-Id: If693045881d84848f17e568df275a5105b6f1cb0
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This initial release notes template is based on previous releases.
For #58645.
Change-Id: I8bae25d6dd9778a69963b8b4903a6dc1c180e15f
Reviewed-on: https://go-review.googlesource.com/c/go/+/470296
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