From 7a2e20caac9db6f789a7b3fab344b9758af45335 Mon Sep 17 00:00:00 2001
From: Harvey Harrison <harvey.harrison@gmail.com>
Date: Sun, 19 Apr 2015 21:02:06 -0700
Subject: j3dcore: flatten the directory structure a bit
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
---
src/javax/media/j3d/GeometryLock.java | 85 +++++++++++++++++++++++++++++++++++
1 file changed, 85 insertions(+)
create mode 100644 src/javax/media/j3d/GeometryLock.java
(limited to 'src/javax/media/j3d/GeometryLock.java')
diff --git a/src/javax/media/j3d/GeometryLock.java b/src/javax/media/j3d/GeometryLock.java
new file mode 100644
index 0000000..bb1132c
--- /dev/null
+++ b/src/javax/media/j3d/GeometryLock.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package javax.media.j3d;
+
+
+class GeometryLock {
+
+ // Current thread holding the lock
+ Thread threadId = null;
+
+ // Whether the lock is currently owned
+ boolean lockOwned = false;
+
+ // Count > 1 , if there is nested lock by the same thread
+ int count = 0;
+
+ // Number of outstanding threads waiting for the lock
+ int waiting = 0;
+
+
+ synchronized void getLock() {
+ Thread curThread = Thread.currentThread();
+ // If the thread already has the lock, incr
+ // a count and return
+ if (threadId == curThread) {
+ count++;
+ return;
+ }
+ // Otherwise, wait until the lock is released
+ while (lockOwned) {
+ try {
+ waiting++;
+ wait();
+ } catch (InterruptedException e) {
+ System.err.println(e);
+ }
+ waiting--;
+ }
+ count++;
+ // Acquire the lock
+ lockOwned = true;
+ threadId = curThread;
+ }
+
+ synchronized void unLock() {
+ Thread curThread = Thread.currentThread();
+ if (threadId == curThread) {
+ // If the lock count > 0, then return
+ if (--count > 0) {
+ return;
+ }
+ lockOwned = false;
+ threadId = null;
+ if (waiting > 0) {
+ notify();
+ }
+ }
+
+ }
+
+}
--
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