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context: document that Err is unspecified before Done

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It could have been defined the other way, but since the behavior has
been unspecified, this is the conservative approach for people writing
different implementations of the Context interface.

Change-Id: I7334a4c674bc2330cca6874f7cac1eb0eaea3cff
Reviewed-on: https://go-review.googlesource.com/37375
Reviewed-by: Matt Layher <mdlayher@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Sameer Ajmani <sameer@golang.org>
Run-TryBot: Sameer Ajmani <sameer@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Ian Lance Taylor 2017-02-21 12:48:45 -08:00
parent ea48c9d232
commit dc6af19ff8
1 changed files with 1 additions and 0 deletions
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src/context/context.go
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@ -100,6 +100,7 @@ type Context interface {
// Canceled if the context was canceled or DeadlineExceeded if the // Canceled if the context was canceled or DeadlineExceeded if the
// context's deadline passed. No other values for Err are defined. // context's deadline passed. No other values for Err are defined.
// After Done is closed, successive calls to Err return the same value. // After Done is closed, successive calls to Err return the same value.
// Err's return value is unspecified before Done is closed.
Err() error Err() error
// Value returns the value associated with this context for key, or nil // Value returns the value associated with this context for key, or nil