54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
/*
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Copyright The containerd 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 local
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import (
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"sync"
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"github.com/containerd/containerd/errdefs"
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"github.com/pkg/errors"
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)
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// Handles locking references
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var (
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// locks lets us lock in process
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locks = map[string]struct{}{}
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locksMu sync.Mutex
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)
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func tryLock(ref string) error {
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locksMu.Lock()
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defer locksMu.Unlock()
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if _, ok := locks[ref]; ok {
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return errors.Wrapf(errdefs.ErrUnavailable, "ref %s locked", ref)
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}
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locks[ref] = struct{}{}
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return nil
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}
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func unlock(ref string) {
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locksMu.Lock()
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defer locksMu.Unlock()
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if _, ok := locks[ref]; ok {
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delete(locks, ref)
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}
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}
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