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Changkun Ou 2e8dbae85c sync: add new Map method LoadAndDelete 
This CL implements a LoadAndDelete method in sync.Map. Benchmark:

name                                              time/op
LoadAndDeleteBalanced/*sync_test.RWMutexMap-12    98.8ns ± 1%
LoadAndDeleteBalanced/*sync.Map-12                10.3ns ±11%
LoadAndDeleteUnique/*sync_test.RWMutexMap-12      99.2ns ± 2%
LoadAndDeleteUnique/*sync.Map-12                  6.63ns ±10%
LoadAndDeleteCollision/*sync_test.DeepCopyMap-12   140ns ± 0%
LoadAndDeleteCollision/*sync_test.RWMutexMap-12   75.2ns ± 2%
LoadAndDeleteCollision/*sync.Map-12               5.21ns ± 5%

In addition, Delete is bounded and more efficient if many collisions:

DeleteCollision/*sync_test.DeepCopyMap-12   120ns ± 2%   125ns ± 1%   +3.80%  (p=0.000 n=10+9)
DeleteCollision/*sync_test.RWMutexMap-12   73.5ns ± 3%  79.5ns ± 1%   +8.03%  (p=0.000 n=10+9)
DeleteCollision/*sync.Map-12               97.8ns ± 3%   5.9ns ± 4%  -94.00%  (p=0.000 n=10+10)

Fixes #33762

Change-Id: Ic8469a7861d27ab0edeface0078aad8af9b26c2f
Reviewed-on: https://go-review.googlesource.com/c/go/+/205899
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2020-02-25 14:31:55 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api sync: add new Map method LoadAndDelete 2020-02-25 14:31:55 +00:00
doc sync: add new Map method LoadAndDelete 2020-02-25 14:31:55 +00:00
lib/time lib/time: update tz data to 2019c 2019-11-26 12:03:08 +00:00
misc misc/cgo/testshared: explicitly set GOBIN (instead of unsetting it) 2020-02-24 20:47:43 +00:00
src sync: add new Map method LoadAndDelete 2020-02-25 14:31:55 +00:00
test cmd/compile: don't allow NaNs in floating-point constant ops 2020-02-25 02:21:53 +00:00
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AUTHORS A+C: change email address for Akhil Indurti 2019-09-09 15:30:38 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
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README.md

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