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//go:build windows
package hostos
import (
"os"
"golang.org/x/sys/windows"
)
const (
LockShared = 1
LockExclusive = 2
LockNonBlocking = 4
)
func Lock(f *os.File, how int) error {
flags := uint32(0)
if how&LockExclusive != 0 {
flags |= windows.LOCKFILE_EXCLUSIVE_LOCK
}
if how&LockNonBlocking != 0 {
flags |= windows.LOCKFILE_FAIL_IMMEDIATELY
}
var overlapped windows.Overlapped
return windows.LockFileEx(windows.Handle(f.Fd()), flags, 0, 1, 0, &overlapped)
}
func Unlock(f *os.File) error {
var overlapped windows.Overlapped
return windows.UnlockFileEx(windows.Handle(f.Fd()), 0, 1, 0, &overlapped)
}
