commit a67aa9969843eb9fe6ac8353af4a28381d490e8e
author Sameer Ajmani <sameer@golang.org> Wed Jul 30 12:14:59 2014 -0400
committer Sameer Ajmani <sameer@golang.org> Wed Jul 30 12:14:59 2014 -0400
tree 72c184fddc0d59ee575cdd7ebe31a986fbbe6b83
parent a1f3609ec9087c490cd03f4b6a8e825095ae66d7

go.net/context: split the implementations of Background, WithValue,
WithCancel, and WithTimeout to use different concrete types.  Update the
tests and documentation.

This change reduces the size of context structs, reduces the number of
allocations (see TestAllocs) and removes unnecessary pointers from the
heap, such as the timer field for non-timer contexts.

IMPORTANT: I've removed the code in these functions that handles nil Context parameters.  Passing a nil parent Context will now cause a panic.

LGTM=bcmills
R=bcmills, crawshaw
CC=adonovan, golang-codereviews, rsc
https://golang.org/cl/116400043