mirror of
https://github.com/ceph/ceph-csi.git
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07b05616a0
Bumps [k8s.io/kubernetes](https://github.com/kubernetes/kubernetes) from 1.26.2 to 1.27.2. - [Release notes](https://github.com/kubernetes/kubernetes/releases) - [Commits](https://github.com/kubernetes/kubernetes/compare/v1.26.2...v1.27.2) --- updated-dependencies: - dependency-name: k8s.io/kubernetes dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>
71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package promise
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import (
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"sync"
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)
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// promise implements the WriteOnce interface.
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type promise struct {
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doneCh <-chan struct{}
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doneVal interface{}
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setCh chan struct{}
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onceler sync.Once
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value interface{}
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}
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var _ WriteOnce = &promise{}
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// NewWriteOnce makes a new thread-safe WriteOnce.
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//
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// If `initial` is non-nil then that value is Set at creation time.
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//
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// If a `Get` is waiting soon after `doneCh` becomes selectable (which
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// never happens for the nil channel) then `Set(doneVal)` effectively
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// happens at that time.
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func NewWriteOnce(initial interface{}, doneCh <-chan struct{}, doneVal interface{}) WriteOnce {
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p := &promise{
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doneCh: doneCh,
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doneVal: doneVal,
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setCh: make(chan struct{}),
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}
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if initial != nil {
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p.Set(initial)
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}
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return p
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}
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func (p *promise) Get() interface{} {
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select {
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case <-p.setCh:
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case <-p.doneCh:
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p.Set(p.doneVal)
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}
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return p.value
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}
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func (p *promise) Set(value interface{}) bool {
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var ans bool
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p.onceler.Do(func() {
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p.value = value
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close(p.setCh)
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ans = true
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})
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return ans
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}
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