!7

import java.nio.channels.*;
import java.nio.file.*;

static volatile S status;

p {
  File path = dummyFileForLockTest();
  FileChannel channel = FileChannel.open(toPath(path), StandardOpenOption.CREATE, StandardOpenOption.WRITE);
  temp FileLock lock = channel.tryLock();
  if (lock == null) print(status = "Couldn't lock.");
  else print(status = "Locked!");
  bot("Lock a file.");
}

answer {
  if "status" ret status;
}

Began life as a copy of #1016917