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text/template: clarify the safety of Template.New

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In particular, the returned template isn't independent from the parent.
For example, it can't be parsed concurrently with other children
templates. Only methods which are explicitly safe for concurrent use,
like Execute, may be used concurrently.

Fixes #30281.

Change-Id: Idc84bf4199c035316cdb83b950fd4a8f2a71cd0c
Reviewed-on: https://go-review.googlesource.com/c/go/+/172297
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
This commit is contained in:
Daniel Martí 2019-04-16 22:13:47 +09:00
parent 7647fcd392
commit eb2fabf2fa
1 changed files with 4 additions and 0 deletions
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4
src/text/template/template.go
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@ -50,6 +50,10 @@ func (t *Template) Name() string {
// New allocates a new, undefined template associated with the given one and with the same
// delimiters. The association, which is transitive, allows one template to
// invoke another with a {{template}} action.
//
// Because associated templates share underlying data, template construction
// cannot be done safely in parallel. Once the templates are constructed, they
// can be executed in parallel.
func (t *Template) New(name string) *Template {
t.init()
nt := &Template{