code: protected boolean actualWrite(ReadableData readable, ByteBufferProvider bufferProvider) throws IOException {
          if (!isAlive())
              return false;
  
          ByteBufferWrapper bb = readable.getByteBuffer(bufferProvider);
          bb.clear();
          int r = readable.read(bb);
          if (r > 0) {
  //            int written = epoll.write(this, bb.address, bb.offset(), r);
              int written = write(bb, bb.offset(), r);
              bb.clear();
  //            System.out.println("write: " + written + " (" + readable.complete() + "/" + readable.length() + ")" + " to " + this);
              if (written != r) {
                  readable.unread(r - written);
                  return false;
              }
              return true;
          }
          return false;
      }
docs: /*
  @return true if connection is ready to write data