go.blog/context: an article about go.net/context.Context.

Blog demo (internal):
http://olivia.nyc.corp.google.com:8081/context

Server demo (internal):
http://olivia.nyc.corp.google.com:8080/search?q=golang&timeout=1s

LGTM=bcmills, adg, r
R=r, rsc, adg, bcmills, ken, adonovan, dsymonds, crawshaw, campoy, hakim, dneil
https://golang.org/cl/116820044

1 files changed, 22 insertions, 0 deletions

diff --git a/content/context/tomb/tomb.go b/content/context/tomb/tomb.go
new file mode 100644
index 0000000..8a2142f
--- /dev/null
+++ b/content/context/tomb/tomb.go
@@ -0,0 +1,22 @@
+// Package tomb provides a Context implementation that is canceled when either
+// its parent Context is canceled or a provided Tomb is killed.
+package tomb
+
+import (
+	"code.google.com/p/go.net/context"
+	tomb "gopkg.in/tomb.v2"
+)
+
+// NewContext returns a Context that is canceled either when parent is canceled
+// or when t is Killed.
+func NewContext(parent context.Context, t *tomb.Tomb) context.Context {
+	ctx, cancel := context.WithCancel(parent)
+	go func() {
+		select {
+		case <-t.Dying():
+			cancel()
+		case <-ctx.Done():
+		}
+	}()
+	return ctx
+}