Release notes from sync

v0.20.0: errgroup: fix a typo in the documentation

2026-02-23T18:54:42Z

Change-Id: I265cbc977e15a81c0068e7b60933843d8f02fe6a
Reviewed-on: https://go-review.googlesource.com/c/sync/+/747140
Reviewed-by: Alan Donovan [email protected]">[email protected]
Auto-Submit: Alan Donovan [email protected]">[email protected]
LUCI-TryBot-Result: Go LUCI [email protected]">[email protected]
Reviewed-by: Dmitri Shuralyov [email protected]">[email protected]

v0.19.0: errgroup: use consistent read for SetLimit panic

2025-12-04T00:24:39Z

This could produce a confusing panic message if the second len(g.sem)
call returns 0. Avoid that by reading it once.

Change-Id: Ibdb4963f90921bc20427b3f1e2de410638f6cb6b
Reviewed-on: https://go-review.googlesource.com/c/sync/+/726280
Reviewed-by: Alan Donovan [email protected]">[email protected]
Auto-Submit: Alan Donovan [email protected]">[email protected]
Reviewed-by: Sean Liao [email protected]">[email protected]
LUCI-TryBot-Result: Go LUCI [email protected]">[email protected]
Reviewed-by: Dmitri Shuralyov [email protected]">[email protected]

v0.18.0: errgroup: fix some typos in comment

2025-10-21T17:44:11Z

Change-Id: I3dd6df0eb2cc592f8811935cbcbca54a0d9304ce
Reviewed-on: https://go-review.googlesource.com/c/sync/+/713400
Reviewed-by: Alan Donovan [email protected]">[email protected]
LUCI-TryBot-Result: Go LUCI [email protected]">[email protected]
Reviewed-by: David Chase [email protected]">[email protected]
Auto-Submit: Alan Donovan [email protected]">[email protected]

v0.17.0: all: upgrade go directive to at least 1.24.0 [generated]

2025-08-13T14:47:05Z

By now Go 1.25.0 has been released, and Go 1.23 is no longer supported
per the Go Release Policy (see https://go.dev/doc/devel/release#policy).

For golang/go#69095.

[git-generate]
(cd . && go get [email protected] && go mod tidy && go fix ./... && go mod edit -toolchain=none)

Change-Id: Ifa2b9ecc1efe475dfe4d60f41fb3ad2c63896d12
Reviewed-on: https://go-review.googlesource.com/c/sync/+/695358
Reviewed-by: Dmitri Shuralyov [email protected]">[email protected]
LUCI-TryBot-Result: Go LUCI [email protected]">[email protected]
Auto-Submit: Gopher Robot [email protected]">[email protected]
Reviewed-by: David Chase [email protected]">[email protected]

v0.16.0: errgroup: revert propagation of panics

2025-06-20T18:29:35Z

This change reverts CL 644575, which caused panics in the f()
call after group.Go(f) to be propagated to the subsequent
group.Wait call. This caused more problems than it solved.

Also:

preserve some of the doc comment wording of Group.Go.
leave a "tsunami stone" comment in Group.Go.

Fixes golang/go#53757
Updates golang/go#74275
Updates golang/go#74304
Updates golang/go#74306

Change-Id: I6e3992510944db7d69c72eaf241aedf8b84e62dd
Reviewed-on: https://go-review.googlesource.com/c/sync/+/682935
LUCI-TryBot-Result: Go LUCI [email protected]">[email protected]
Reviewed-by: qiu laidongfeng2 [email protected]">[email protected]
Reviewed-by: Junyang Shao [email protected]">[email protected]
Reviewed-by: Sean Liao [email protected]">[email protected]
Auto-Submit: Sean Liao [email protected]">[email protected]

v0.15.0: errgroup: remove duplicated comment

2025-05-28T15:13:15Z

Change-Id: I5cdcc5034ccd87b939a406693e97485553ab60fa
Reviewed-on: https://go-review.googlesource.com/c/sync/+/676715
Reviewed-by: Dmitri Shuralyov [email protected]">[email protected]
Reviewed-by: Alan Donovan [email protected]">[email protected]
Auto-Submit: Alan Donovan [email protected]">[email protected]
LUCI-TryBot-Result: Go LUCI [email protected]">[email protected]

v0.14.0: errgroup: propagate panic and Goexit through Wait

2025-04-07T16:20:50Z

Recovered panic values are wrapped and saved in Group.
Goexits are detected by a sentinel value set after the given function
returns normally. Wait propagates the first instance of a panic or
Goexit.

According to the runtime.Goexit after the code will not be executed,
with a bool, if f not call runtime.Goexit, is true,
determine whether to propagate runtime.Goexit.

Fixes golang/go#53757

Change-Id: Ic6426fc014fd1c4368ebaceef5b0d6163770a099
Reviewed-on: https://go-review.googlesource.com/c/sync/+/644575
Reviewed-by: Sean Liao [email protected]">[email protected]
Auto-Submit: Alan Donovan [email protected]">[email protected]
Commit-Queue: Alan Donovan [email protected]">[email protected]
Reviewed-by: Alan Donovan [email protected]">[email protected]
Reviewed-by: Dmitri Shuralyov [email protected]">[email protected]
LUCI-TryBot-Result: Go LUCI [email protected]">[email protected]

v0.13.0: errgroup: document calling Go before Wait

2025-04-02T15:05:34Z

Fixes golang/go#70284

Change-Id: I31d60ea182226c032b0ffbddcbb5b53675dfd5e6
Reviewed-on: https://go-review.googlesource.com/c/sync/+/660075
LUCI-TryBot-Result: Go LUCI [email protected]">[email protected]
Reviewed-by: Alan Donovan [email protected]">[email protected]
Auto-Submit: Damien Neil [email protected]">[email protected]
Reviewed-by: Damien Neil [email protected]">[email protected]

v0.12.0: errgroup: drop support for Go versions before 1.20

2025-03-04T23:33:19Z

Change-Id: I7de5dfae21c4ffe31d6c16e3df0fed3e2269cb16
Reviewed-on: https://go-review.googlesource.com/c/sync/+/654421
LUCI-TryBot-Result: Go LUCI [email protected]">[email protected]
Reviewed-by: Ian Lance Taylor [email protected]">[email protected]
Auto-Submit: Ian Lance Taylor [email protected]">[email protected]
Commit-Queue: Ian Lance Taylor [email protected]">[email protected]
Reviewed-by: Dmitri Shuralyov [email protected]">[email protected]
Reviewed-by: Dmitri Shuralyov [email protected]">[email protected]

v0.11.0: sync/errgroup: improve documentation for semaphore limit behavior

2025-01-17T15:49:37Z

Updated the documentation for SetLimit and Go functions in the
errgroup package. the note clarifies the behavior when the semaphore
limit is set to zero, which could lead to a deadlock if not handled
properly. the updated documentation warns users to set a positive
semaphore limit to avoid blocking goroutines and potential deadlock

this change improves the clarity of API and helps users understand how
to properly use the semaphore limit to prevent issues in concurrent
execution

Change-Id: Ie62acc38ef804b3590c04bddba00a3cce21e8cef
Reviewed-on: https://go-review.googlesource.com/c/sync/+/642215
Reviewed-by: Michael Knyszek [email protected]">[email protected]
LUCI-TryBot-Result: Go LUCI [email protected]">[email protected]
Reviewed-by: Ian Lance Taylor [email protected]">[email protected]
Auto-Submit: Ian Lance Taylor [email protected]">[email protected]