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Colin Arnott 2422c5eae5 sync/atomic: add (*Value).Swap and (*Value).CompareAndSwap
The functions SwapPointer and CompareAndSwapPointer can be used to
interact with unsafe.Pointer, however generally it is prefered to work
with Value, due to its safer interface. As such, they have been added
along with glue logic to maintain invariants Value guarantees.

To meet these guarantees, the current implementation duplicates much of
the Store function. Some of this is due to inexperience with concurrency
and desire for correctness, but the lack of generic programming
functionality does not help.

Fixes #39351

Change-Id: I1aa394b1e70944736ac1e19de49fe861e1e46fba
Reviewed-on: https://go-review.googlesource.com/c/go/+/241678
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2021-05-04 00:15:27 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api math: replace float32/64 extrema with exact expressions 2021-05-03 16:23:09 +00:00
doc time: make time.Time print a valid Go string with %#v 2021-05-02 20:59:26 +00:00
lib/time lib/time, time/tzdata: update tzdata to 2021a 2021-01-25 16:08:46 +00:00
misc runtime: rename walltime1 to walltime 2021-04-29 14:15:04 +00:00
src sync/atomic: add (*Value).Swap and (*Value).CompareAndSwap 2021-05-04 00:15:27 +00:00
test cmd/compile: make the stack allocator more careful about register args. 2021-05-03 17:46:12 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS A+C: add Weixie Cui (individual CLA) 2021-04-30 16:27:50 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md
CONTRIBUTORS A+C: add Weixie Cui (individual CLA) 2021-04-30 16:27:50 +00:00
LICENSE
PATENTS
README.md README: pull gopher image from website 2021-02-16 18:25:10 +00:00
SECURITY.md

The Go Programming Language

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