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Michael Anthony Knyszek 6508fdad9d runtime: formalize and fix gcPercent synchronization 
Currently gcController.gcPercent is read non-atomically by
gcControllerState.revise and gcTrigger.test, but these users may
execute concurrently with an update to gcPercent.

Although revise's results are best-effort, reading it directly in this
way is, generally speaking, unsafe.

This change makes gcPercent atomically updated for concurrent readers
and documents the complete synchronization semantics.

Because gcPercent otherwise only updated with the heap lock held or the
world stopped, all other reads can remain unsynchronized.

For #44167.

Change-Id: If09af103aae84a1e133e2d4fed8ab888d4b8f457
Reviewed-on: https://go-review.googlesource.com/c/go/+/308690
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
2021-10-21 18:19:51 +00:00
.github .github: update IRC server 2021-09-30 19:56:27 +00:00
api cmd/go: stamp VCS revision and uncommitted status into binaries 2021-10-14 18:44:37 +00:00
doc doc/go1.18: add release notes for build and VCS info 2021-10-15 20:29:48 +00:00
lib/time lib/time: fix RFC 6557 url 2021-08-15 02:18:46 +00:00
misc misc/wasm: expect environment to provide polyfills 2021-10-16 14:50:21 +00:00
src runtime: formalize and fix gcPercent synchronization 2021-10-21 18:19:51 +00:00
test test/codegen: updated comparison test to verify on ppc64,ppc64le 2021-10-21 13:05:07 +00:00
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.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
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SECURITY.md

README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

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Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.