Clayton Coleman 501db86fbe DelayingQueue.ShutDown() should be reentrant ...

All queue ShutDown() calls should be able to be invoked multiple times.

```
Observed a panic: "close of closed channel" (close of closed channel)
/go/src/github.com/openshift/cluster-version-operator/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:76
/go/src/github.com/openshift/cluster-version-operator/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:65
/go/src/github.com/openshift/cluster-version-operator/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:51
/usr/local/go/src/runtime/asm_amd64.s:573
/usr/local/go/src/runtime/panic.go:502
/usr/local/go/src/runtime/chan.go:333
/go/src/github.com/openshift/cluster-version-operator/vendor/k8s.io/client-go/util/workqueue/delaying_queue.go:137
```

Use sync.Once to guarantee a single close.

Kubernetes-commit: d2f7eb5235a93556261c8947e7a87342aeeaee2b

2019-04-27 16:16:55 -04:00

..

cert

Updated OWNERS files to include link to docs

2019-01-30 20:05:00 +01:00

certificate

Interrupt WaitForCertificate if desired kubelet serving cert changes

2019-05-15 11:47:23 -04:00

connrotation

Extract connection rotating dialer into a package

2018-05-16 10:30:53 -07:00

exec

sync: initially remove files BUILD */BUILD BUILD.bazel */BUILD.bazel

2018-03-15 09:19:38 +00:00

flowcontrol

replace time.Now().Sub with time.Since

2019-03-18 23:57:26 +08:00

homedir

sync: initially remove files BUILD */BUILD BUILD.bazel */BUILD.bazel

2018-03-15 09:19:38 +00:00

jsonpath

fix increment-decrement lint error

2019-05-06 13:14:51 +08:00

keyutil

Extract new keyutil package from client-go/util/cert

2018-12-09 16:24:38 -08:00

retry

Remove executable file permission from OWNERS files

2019-01-03 12:18:20 -05:00

testing

sync: initially remove files BUILD */BUILD BUILD.bazel */BUILD.bazel

2018-03-15 09:19:38 +00:00

workqueue

DelayingQueue.ShutDown() should be reentrant

2019-04-27 16:16:55 -04:00