mirror of
https://github.com/ceph/ceph-csi.git
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f87d06ed85
Several packages are only used while running the e2e suite. These packages are less important to update, as the they can not influence the final executable that is part of the Ceph-CSI container-image. By moving these dependencies out of the main Ceph-CSI go.mod, it is easier to identify if a reported CVE affects Ceph-CSI, or only the testing (like most of the Kubernetes CVEs). Signed-off-by: Niels de Vos <ndevos@ibm.com>
59 lines
1.5 KiB
Go
59 lines
1.5 KiB
Go
/*
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Copyright 2018 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 keymutex
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import (
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"hash/fnv"
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"runtime"
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"sync"
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)
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// NewHashed returns a new instance of KeyMutex which hashes arbitrary keys to
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// a fixed set of locks. `n` specifies number of locks, if n <= 0, we use
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// number of cpus.
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// Note that because it uses fixed set of locks, different keys may share same
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// lock, so it's possible to wait on same lock.
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func NewHashed(n int) KeyMutex {
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if n <= 0 {
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n = runtime.NumCPU()
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}
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return &hashedKeyMutex{
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mutexes: make([]sync.Mutex, n),
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}
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}
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type hashedKeyMutex struct {
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mutexes []sync.Mutex
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}
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// Acquires a lock associated with the specified ID.
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func (km *hashedKeyMutex) LockKey(id string) {
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km.mutexes[km.hash(id)%uint32(len(km.mutexes))].Lock()
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}
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// Releases the lock associated with the specified ID.
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func (km *hashedKeyMutex) UnlockKey(id string) error {
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km.mutexes[km.hash(id)%uint32(len(km.mutexes))].Unlock()
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return nil
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}
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func (km *hashedKeyMutex) hash(id string) uint32 {
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h := fnv.New32a()
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h.Write([]byte(id))
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return h.Sum32()
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}
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