From e4baba27507ce78e64a150ec6f69fb96f5721a34 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Tue, 27 Sep 2011 11:52:53 +0200
Subject: Lock ChangeSet (fin): Cleanup, fix and enhance RecursiveLock
 implementation

- RecursiveLock _is_ interface.

- Use LockFactory to create a RecursiveLock.

- Impl: RecursiveLockImpl01Unfairish
  - just using notify w/o any queue: fast
  - still enqueuing new lock-applicants if queue full (nice)
  - lock's sync extends AbstractOwnableSynchronizer and uses it (monitor)

- Impl: RecursiveLockImpl01CompleteFair
  - using queue and interrupt for correctness (slow)
  - lock's sync extends AbstractOwnableSynchronizer and uses it (monitor)

- Impl: RecursiveLockImplJava5 for using Java5's concurrency impl.
  - to verify correctness, performance and deviation of locking time

TestRecursiveLock01 new performance measurements incl. simple avrg and deviation
shows best combined performance-deviation w/ our RecursiveLockImpl01Unfairish
os Linux and MacOSX.
RecursiveLockImpl01Unfairish is the default in LockFactory.

Adding 'private' LockDebugUtil, allowing validating all holdings locks
of one thread as stack traces (Throwable).
Besides the AbstractOwnableSynchronizer utilization, this helps debugging deadlocks
and starvation very well.
---
 .../com/jogamp/common/util/locks/LockFactory.java  | 61 ++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 src/java/com/jogamp/common/util/locks/LockFactory.java

(limited to 'src/java/com')

diff --git a/src/java/com/jogamp/common/util/locks/LockFactory.java b/src/java/com/jogamp/common/util/locks/LockFactory.java
new file mode 100644
index 0000000..c374c2d
--- /dev/null
+++ b/src/java/com/jogamp/common/util/locks/LockFactory.java
@@ -0,0 +1,61 @@
+/**
+ * Copyright 2011 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+package com.jogamp.common.util.locks;
+
+import jogamp.common.util.locks.RecursiveLockImpl01CompleteFair;
+import jogamp.common.util.locks.RecursiveLockImpl01Unfairish;
+import jogamp.common.util.locks.RecursiveLockImplJava5;
+
+public class LockFactory {
+
+    public enum ImplType {
+        Int01(0), Java5(1); 
+        
+        public final int id;
+
+        ImplType(int id){
+            this.id = id;
+        }
+    }    
+    
+    /** default is ImplType.Int01, unfair'ish (fastest w/ least deviation) */
+    public static RecursiveLock createRecursiveLock() {
+        return new RecursiveLockImpl01Unfairish();
+    }
+    
+    public static RecursiveLock createRecursiveLock(ImplType t, boolean fair) {
+        switch(t) {
+            case Int01:
+                return fair ? new RecursiveLockImpl01CompleteFair() : new RecursiveLockImpl01Unfairish();
+            case Java5:
+                return new RecursiveLockImplJava5(fair);
+        }
+        throw new InternalError("XXX");
+    }
+    
+}
-- 
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