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a489bd2674
With this PR, the second call to `Acquire()` will block unless the lock is released (process exits). Also removed the memory mutex in the previous code since we don't need `Release()` here so no need to save and protect the local fd. Fix #42929.
36 lines
1.0 KiB
Go
36 lines
1.0 KiB
Go
// +build linux darwin freebsd openbsd netbsd dragonfly
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/*
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Copyright 2016 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 flock
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import "syscall"
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// Acquire acquires a lock on a file for the duration of the process. This method
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// is reentrant.
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func Acquire(path string) error {
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fd, err := syscall.Open(path, syscall.O_CREAT|syscall.O_RDWR, 0600)
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if err != nil {
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return err
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}
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// We don't need to close the fd since we should hold
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// it until the process exits.
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return syscall.Flock(fd, syscall.LOCK_EX)
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}
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