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Java > Open Source Codes > org > armedbear > lisp > gc


1 /*
2  * gc.java
3  *
4  * Copyright (C) 2003 Peter Graves
5  * $Id: gc.java,v 1.1 2003/10/14 12:47:18 piso Exp $
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version 2
10  * of the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20  */

21
22 package org.armedbear.lisp;
23
24 // ### gc
25
public final class gc extends Primitive0
26 {
27     private gc()
28     {
29         super("gc", PACKAGE_EXT);
30     }
31
32     public LispObject execute()
33     {
34         Runtime JavaDoc runtime = Runtime.getRuntime();
35         long free = 0;
36         long maxFree = 0;
37         while (true) {
38             try {
39                 runtime.gc();
40                 Thread.currentThread().sleep(100);
41                 runtime.runFinalization();
42                 Thread.currentThread().sleep(100);
43                 runtime.gc();
44                 Thread.currentThread().sleep(100);
45             }
46             catch (InterruptedException JavaDoc e) {}
47             free = runtime.freeMemory();
48             if (free > maxFree)
49                 maxFree = free;
50             else
51                 break;
52         }
53         return number(free);
54     }
55
56     private static final gc GC = new gc();
57 }
58
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