| commit | 7148478f1b433caa11c8827657ee1bc61f0b1c5d | [log] [tgz] |
|---|---|---|
| author | Rhys Hiltner <rhys@justin.tv> | Fri Nov 08 10:30:24 2019 -0800 |
| committer | Brad Fitzpatrick <bradfitz@golang.org> | Sat Nov 09 19:31:32 2019 +0000 |
| tree | f5c52805a13b0ba7285133891b22d5424aa059cc | |
| parent | 6e111956ab4849976f9dcf46ecac575fa8105268 [diff] |
sync: yield to the waiter when unlocking a starving mutex When we have already assigned the semaphore ticket to a specific waiter, we want to get the waiter running as fast as possible since no other G waiting on the semaphore can acquire it optimistically. The net effect is that, when a sync.Mutex is contended, the code in the critical section guarded by the Mutex gets a priority boost. Fixes #33747 The original work was done in CL 200577 by Carlo Alberto Ferraris. The change was reverted in CL 205817 because it broke the linux-arm64-packet and solaris-amd64-oraclerel builders. Change-Id: I76d79b1d63fd206ed1c57fe6900cb7ae9e4d46cb Reviewed-on: https://go-review.googlesource.com/c/go/+/206180 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.
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.
Official binary distributions are available at https://golang.org/dl/.
After downloading a binary release, visit https://golang.org/doc/install or load doc/install.html in your web browser for installation instructions.
If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source or load doc/install-source.html in your web browser for source installation instructions.
Go is the work of thousands of contributors. We appreciate your help!
To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html
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.