[jruby-joni] 10/279: JRUBY-1941: Wrap WeakReference around stuff stored in ThreadLocals

[Hideki Yamane]

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henrich pushed a commit to branch debian/sid
in repository jruby-joni.

commit d5e3f294aa28b8c4e2901ffa92f069f71df3b46c
Author: Nick Sieger <nick at nicksieger.com>
Date:   Sat Jan 12 05:56:52 2008 +0000

    JRUBY-1941: Wrap WeakReference around stuff stored in ThreadLocals
    
    
    git-svn-id: http://svn.codehaus.org/jruby/joni/trunk@5555 961051c9-f516-0410-bf72-c9f7e237a7b7
---
 src/org/joni/StackMachine.java | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/org/joni/StackMachine.java b/src/org/joni/StackMachine.java
index 11aa350..7a3076f 100644
--- a/src/org/joni/StackMachine.java
+++ b/src/org/joni/StackMachine.java
@@ -19,6 +19,7 @@
  */
 package org.joni;
 
+import java.lang.ref.WeakReference;
 import static org.joni.BitStatus.bsAt;
 
 import java.util.Arrays;
@@ -66,12 +67,20 @@ abstract class StackMachine extends IntHolder implements StackType {
         stack = newStack;
     }    
     
-    static final ThreadLocal<StackEntry[]> stacks = new ThreadLocal<StackEntry[]>();
+    static final ThreadLocal<WeakReference<StackEntry[]>> stacks
+            = new ThreadLocal<WeakReference<StackEntry[]>>() {
+        @Override
+        protected WeakReference<StackEntry[]> initialValue() {
+            return new WeakReference<StackEntry[]>(allocateStack());
+        }
+    };
+
     private static StackEntry[] fetchStack() {
-        StackEntry[] stack = stacks.get();
+        WeakReference<StackEntry[]> ref = stacks.get();
+        StackEntry[] stack = ref.get();
         if (stack == null) {
-            stacks.set(stack = allocateStack());
-            return stack;
+            ref = new WeakReference<StackEntry[]>(stack = allocateStack());
+            stacks.set(ref);
         }
         return stack;
     }

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