1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
121 */
122 private static Reference pending = null;
123
124 /* High-priority thread to enqueue pending References
125 */
126 private static class ReferenceHandler extends Thread {
127
128 ReferenceHandler(ThreadGroup g, String name) {
129 super(g, name);
130 }
131
132 public void run() {
133 for (;;) {
134 Reference r;
135 synchronized (lock) {
136 if (pending != null) {
137 r = pending;
138 pending = r.discovered;
139 r.discovered = null;
140 } else {
141 try {
142 lock.wait();
143 } catch (InterruptedException x) { }
144 continue;
145 }
146 }
147
148 // Fast path for cleaners
149 if (r instanceof Cleaner) {
150 ((Cleaner)r).clean();
151 continue;
152 }
153
154 ReferenceQueue q = r.queue;
155 if (q != ReferenceQueue.NULL) q.enqueue(r);
156 }
157 }
158 }
159
160 static {
161 ThreadGroup tg = Thread.currentThread().getThreadGroup();
162 for (ThreadGroup tgn = tg;
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1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
121 */
122 private static Reference pending = null;
123
124 /* High-priority thread to enqueue pending References
125 */
126 private static class ReferenceHandler extends Thread {
127
128 ReferenceHandler(ThreadGroup g, String name) {
129 super(g, name);
130 }
131
132 public void run() {
133 for (;;) {
134 Reference r;
135 synchronized (lock) {
136 if (pending != null) {
137 r = pending;
138 pending = r.discovered;
139 r.discovered = null;
140 } else {
141 // The waiting on the lock may cause an OOME because it may try to allocate
142 // exception objects, so also catch OOME here to avoid silent exit of the
143 // reference handler thread.
144 //
145 // Explicitly define the order of the two exceptions we catch here
146 // when waiting for the lock.
147 //
148 // We do not want to try to potentially load the InterruptedException class
149 // (which would be done if this was its first use, and InterruptedException
150 // were checked first) in this situation.
151 //
152 // This may lead to the VM not ever trying to load the InterruptedException
153 // class again.
154 try {
155 try {
156 lock.wait();
157 } catch (OutOfMemoryError x) { }
158 } catch (InterruptedException x) { }
159 continue;
160 }
161 }
162
163 // Fast path for cleaners
164 if (r instanceof Cleaner) {
165 ((Cleaner)r).clean();
166 continue;
167 }
168
169 ReferenceQueue q = r.queue;
170 if (q != ReferenceQueue.NULL) q.enqueue(r);
171 }
172 }
173 }
174
175 static {
176 ThreadGroup tg = Thread.currentThread().getThreadGroup();
177 for (ThreadGroup tgn = tg;
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