Privatae
26 lines
766 B
Go
26 lines
766 B
Go
//go:build windows
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package main
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import (
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"os"
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"golang.org/x/sys/windows"
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)
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// flockFile takes an exclusive lock on f (blocking) via LockFileEx. Released
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// by closing f (Windows releases file locks with the handle).
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func flockFile(f *os.File) error {
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var ol windows.Overlapped
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return windows.LockFileEx(windows.Handle(f.Fd()), windows.LOCKFILE_EXCLUSIVE_LOCK, 0, 1, 0, &ol)
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}
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// flockFileNB is flockFile without the wait — LOCKFILE_FAIL_IMMEDIATELY. Present
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// so the package builds on Windows; the singleton itself is Linux-only today
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// (singleton.go).
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func flockFileNB(f *os.File) error {
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var ol windows.Overlapped
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return windows.LockFileEx(windows.Handle(f.Fd()),
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windows.LOCKFILE_EXCLUSIVE_LOCK|windows.LOCKFILE_FAIL_IMMEDIATELY, 0, 1, 0, &ol)
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}
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