*** empty log message ***

[IRC.git] / Robust / Transactions / dstm2 / src / dstm2 / SpecialLock.java

diff --git a/Robust/Transactions/dstm2/src/dstm2/SpecialLock.java b/Robust/Transactions/dstm2/src/dstm2/SpecialLock.java
new file mode 100644 (file)
index 0000000..33841af
--- /dev/null
+++ b/Robust/Transactions/dstm2/src/dstm2/SpecialLock.java
@@ -0,0 +1,51 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package dstm2;
+
+
+import java.util.concurrent.locks.ReentrantLock;
+
+/**
+ *
+ * @author navid
+ */
+public class SpecialLock extends ReentrantLock{
+    private static SpecialLock instance = null;
+    private Transaction ownerTransaction = null;
+
+    private SpecialLock() {
+    }
+    
+    
+    public synchronized void lock(Transaction tr){
+        super.lock();
+        setOwnerTransaction(ownerTransaction);
+    }
+    
+    public synchronized void unlock(Transaction tr){
+        super.unlock();
+        setOwnerTransaction(null);
+    }
+    
+    public synchronized void setOwnerTransaction(Transaction tr){
+        ownerTransaction = tr;
+    }
+    
+    public synchronized Transaction getOwnerTransaction(){
+        return ownerTransaction;
+    }
+    
+    public synchronized static SpecialLock getSpecialLock(){
+        if (instance == null){ 
+            instance = new SpecialLock();
+            return instance;
+        }
+        else
+            return instance;    
+        
+    }
+
+}