// It returns the number of bytes written and an error, if any.
// Since Plan 9 preserves message boundaries, never allow
// a zero-byte write.
func (f *File) write(b []byte) (n int, err error) {
	if err := f.writeLock(); err != nil {
		return 0, err
	}
	defer f.writeUnlock()
	if len(b) == 0 {
		return 0, nil
	}
	return fixCount(syscall.Write(f.fd, b))
}

    }

    @Override
    public Lock readLock() {
      return new WeakSafeLock(delegate.readLock(), this);
    }

    @Override
    public Lock writeLock() {
      return new WeakSafeLock(delegate.writeLock(), this);
    }
  }

  /** Lock object that ensures a strong reference is retained to a specified object. */
  private static final class WeakSafeLock extends ForwardingLock {

// all of it to the socket. This behavior is similar to the Write
// step of an io.Copy in userspace.
func splicePump(sock *FD, pipefd int, inPipe int) (int, error) {
	if err := sock.writeLock(); err != nil {
		return 0, err
	}
	defer sock.writeUnlock()
	if err := sock.pd.prepareWrite(sock.isFile); err != nil {
		return 0, err
	}
	written := 0
	for inPipe > 0 {

    }

    @Override
    public Lock readLock() {
      return new WeakSafeLock(delegate.readLock(), this);
    }

    @Override
    public Lock writeLock() {
      return new WeakSafeLock(delegate.writeLock(), this);
    }
  }

  /** Lock object that ensures a strong reference is retained to a specified object. */
  private static final class WeakSafeLock extends ForwardingLock {

            if (session.getRequest().getDegreeOfConcurrency() > 1) {
                boolean aggregator = mojoDescriptor.isAggregator();
                acquiredAggregatorLock = aggregator ? aggregatorLock.writeLock() : aggregatorLock.readLock();
                acquiredProjectLock = getProjectLock(session);
                if (!acquiredAggregatorLock.tryLock()) {
                    Thread owner = aggregatorLock.getOwner();