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doc/go1.13: mention faster sync.Mutex/RWMutex/Once 

Mention faster sync.Mutex/RWMutex/Once in the 1.13 release notes.

Change-Id: I29d8a5004a0af42542e8db82a8c9e2e06a15dbb0
GitHub-Last-Rev: 2995401dab
GitHub-Pull-Request: golang/go#33404
Reviewed-on: https://go-review.googlesource.com/c/go/+/188479
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
This commit is contained in:
Carlo Alberto Ferraris 2019-08-10 13:11:26 +00:00 committed by Emmanuel Odeke
parent 9c1f14f376
commit 3928915ec7
1 changed files with 8 additions and 0 deletions
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@ -892,6 +892,14 @@ godoc
<dl id="sync"><dt><a href="/pkg/sync/">sync</a></dt>
<dd>
<p><!-- CL 148958, CL 148959, CL 152697, CL 152698 -->
The fast paths of <a href="/pkg/sync/#Mutex.Lock"><code>Mutex.Lock</code></a>, <a href="/pkg/sync/#Mutex.Unlock"><code>Mutex.Unlock</code></a>,
<a href="/pkg/sync/#RWMutex.Lock"><code>RWMutex.Lock</code></a>, <a href="/pkg/sync/#Mutex.RUnlock"><code>RWMutex.RUnlock</code></a>, and
<a href="/pkg/sync/#Once.Do"><code>Once.Do</code></a> are now inlined in their callers.
For the uncontended cases on amd64, these changes make <a href="/pkg/sync/#Once.Do"><code>Once.Do</code></a> twice as fast, and the
<a href="/pkg/sync/#Mutex"><code>Mutex</code></a>/<a href="/pkg/sync/#RWMutex"><code>RWMutex</code></a> methods up to 10% faster.
</p>
<p><!-- CL 166960 -->
Large <a href="/pkg/sync/#Pool"><code>Pool</code></a> no longer increase stop-the-world pause times.
</p>