You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lockfile.go
    path of file: ./repos/podman/vendor/github.com/containers/storage/pkg/lockfile
    
    the code of the file until where you have to start completion: package lockfile

import (
	"fmt"
	"os"
	"path/filepath"
	"sync"
	"time"
)

// A Locker represents a file lock where the file is used to cache an
// identifier of the last party that made changes to whatever's being protected
// by the lock.
//
// Deprecated: Refer directly to *LockFile, the provided implementation, instead.
type Locker interface {
	// Acquire a writer lock.
	// The default unix implementation panics if:
	// - opening the lockfile failed
	// - tried to lock a read-only lock-file
	Lock()

	// Unlock the lock.
	// The default unix implementation panics if:
	// - unlocking an unlocked lock
	// - if the lock counter is corrupted
	Unlock()

	// Acquire a reader lock.
	RLock()

	// Touch records, for others sharin
    
func (l *LockFile) AssertLocked() {
	// DO NOT provide a variant that returns the value of l.locked.
	//
	// If the caller does not hold the lock, l.locked might nevertheless be true because another goroutine does hold it, and
	// we can’t tell the difference.
	//
	// Hence, this “AssertLocked” method, which exists only for sanity checks.

	// Don’t even bother with l.stateMutex: The caller is expected to hold the lock, and in that case l.locked is constant true
	// with no possible writers.
	// If the caller does not hold the lock, we are violating the locking/memory model anyway, and accessing the data
	// without the lock is more efficient for callers, and potentially more visible to lock analysers for incorrect callers.
	if !l.locked {
		panic("internal error: lock is not held by the expected owner")
	}
}