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jeremybenn |
/* Verify that libffi closures aren't deallocated too early.
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Copyright (C) 2007 Free Software Foundation, Inc
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Contributed by Alexandre Oliva <aoliva@redhat.com>
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If libffi closures are released too early, we lose.
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*/
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import java.util.HashSet;
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public class TestClosureGC {
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public static String objId (Object obj) {
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return obj + "/"
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+ Integer.toHexString(obj.getClass().getClassLoader().hashCode());
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}
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public static class cld extends java.net.URLClassLoader {
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static final Object obj = new cl0();
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public cld () throws Exception {
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super(new java.net.URL[] { });
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/* System.out.println (objId (this) + " created"); */
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}
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public void finalize () {
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/* System.out.println (objId (this) + " finalized"); */
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}
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public String toString () {
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return this.getClass().getName() + "@"
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+ Integer.toHexString (hashCode ());
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}
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public Class loadClass (String name) throws ClassNotFoundException {
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try {
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java.io.InputStream IS = getSystemResourceAsStream
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(name + ".class");
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int maxsz = 1024, readsz = 0;
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byte buf[] = new byte[maxsz];
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for(;;) {
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int readnow = IS.read (buf, readsz, maxsz - readsz);
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if (readnow <= 0)
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break;
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readsz += readnow;
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if (readsz == maxsz) {
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byte newbuf[] = new byte[maxsz *= 2];
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System.arraycopy (buf, 0, newbuf, 0, readsz);
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buf = newbuf;
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}
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}
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return defineClass (name, buf, 0, readsz);
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} catch (Exception e) {
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return super.loadClass (name);
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}
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}
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}
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public static class cl0 {
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public cl0 () {
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/* System.out.println (objId (this) + " created"); */
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}
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public void finalize () {
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/* System.out.println (objId (this) + " finalized"); */
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}
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}
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public static class cl1 {
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final HashSet hs;
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static final Object obj = new cl0();
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public cl1 (final HashSet hs) {
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this.hs = hs;
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/* System.out.println (objId (this) + " created"); */
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}
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public void finalize () {
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/* System.out.println (objId (this) + " finalized"); */
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}
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}
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public static class cl2 {
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final HashSet hs;
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static final Object obj = new cl0();
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public cl2 (final HashSet hs) {
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this.hs = hs;
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/* System.out.println (objId (this) + " created"); */
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}
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public void finalize () {
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/* System.out.println (objId (this) + " finalized"); */
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hs.add(this);
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hs.add(new cl0());
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}
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}
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static final HashSet hs = new HashSet();
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static final Object obj = new cl0();
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public static void main(String[] argv) throws Exception {
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{
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Class[] hscs = { HashSet.class };
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Object[] hsos = { hs };
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new cld().loadClass ("TestClosureGC$cl1").
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getConstructor (hscs).newInstance (hsos);
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new cld().loadClass ("TestClosureGC$cl2").
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getConstructor (hscs).newInstance (hsos);
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new cld().loadClass ("TestClosureGC$cl1").
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getConstructor (hscs).newInstance (hsos);
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new cld().loadClass ("TestClosureGC$cl1").
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getConstructor (hscs).newInstance (hsos);
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}
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for (int i = 1; i <= 5; i++) {
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/* System.out.println ("Will run GC and finalization " + i); */
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System.gc ();
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Thread.sleep (100);
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System.runFinalization ();
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Thread.sleep (100);
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if (hs.isEmpty ())
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continue;
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java.util.Iterator it = hs.iterator ();
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while (it.hasNext ()) {
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Object obj = it.next();
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/* System.out.println (objId (obj) + " in ht, removing"); */
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it.remove ();
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}
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}
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System.out.println ("ok");
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}
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}
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