!7

import java.nio.channels.*;

import java.nio.file.*;

import java.nio.*;

p {

  File path = programFile("lockfile");

  FileChannel channel = FileChannel.open(toPath(path), StandardOpenOption.CREATE, StandardOpenOption.WRITE);

  repeat with sleep 1 {

    {

      temp FileLock lock = channel.tryLock();

      if (lock == null) print("Couldn't lock.");

      else {

        print("Locked!");

        //appendToFile(path, "test\n");

        long size = channel.size();

        print("Size=" + size);

        channel.position(size);

        channel.write(ByteBuffer.wrap(toUtf8("test\n")));

        print("New size=" + channel.size());

        sleepSeconds(1);

      }

    }

  }

}