// +build !windows
package dirlock
import (
"fmt"
"os"
"syscall"
)
type DirLock struct {
dir string
f *os.File
}
func New(dir string) *DirLock {
return &DirLock{
dir: dir,
}
}
func (l *DirLock) Lock() error {
f, err := os.Open(l.dir)
if err != nil {
return err
}
l.f = f
err = syscall.Flock(int(f.Fd()), syscall.LOCK_EX|syscall.LOCK_NB)
if err != nil {
return fmt.Errorf("cannot flock directory %s - %s", l.dir, err)
}
return nil
}
func (l *DirLock) Unlock() error {
defer l.f.Close()
return syscall.Flock(int(l.f.Fd()), syscall.LOCK_UN)
}
