package posix;

/** Make C memory allocated with the <code>malloc</code> posix call
  available to Java.

@author <a href="mailto:stuart@bmsi.com">Stuart D. Gathman</a>
Copyright (C) 1998 Business Management Systems, Inc.  <br>
<p>
This code is distributed under the
<a href="http://www.gnu.org/copyleft/lgpl.html">
GNU Library General Public License </a>
<p>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
<p>
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.
<p>
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA  02111-1307, USA.

 */

public class Malloc extends CPtr {
  public Malloc(int size) {
    super(malloc(size),size);
    if (addr == NULL)
      throw new OutOfMemoryError("malloc");
    if (size < 0) {
      free();
      throw new IllegalArgumentException("malloc");
    }
  }

  protected void finalize() { free(); }

  public synchronized void free() {
    size = 0;	// prevent further access
    free(addr);
    addr = NULL;
  }

  private static native long malloc(int size);
  private static native void free(long caddr);
}