1 files changed, 11 insertions, 0 deletions
diff --git a/src/com/jogamp/opencl/util/concurrent/CLCommandQueuePool.java b/src/com/jogamp/opencl/util/concurrent/CLCommandQueuePool.java
index 9ea960ae..e8bd0124 100644
--- a/src/com/jogamp/opencl/util/concurrent/CLCommandQueuePool.java
+++ b/src/com/jogamp/opencl/util/concurrent/CLCommandQueuePool.java
@@ -29,6 +29,7 @@ public class CLCommandQueuePool<C extends CLQueueContext> implements CLResource
     private List<CLQueueContext> contexts;
     private ExecutorService excecutor;
     private FinishAction finishAction = FinishAction.DO_NOTHING;
+    private boolean released;
 
     private CLCommandQueuePool(CLQueueContextFactory factory, Collection<CLCommandQueue> queues) {
         this.contexts = initContexts(queues, factory);
@@ -157,7 +158,12 @@ public class CLCommandQueuePool<C extends CLQueueContext> implements CLResource
     /**
      * Releases all queues.
      */
+    @Override
     public void release() {
+        if(released) {
+            throw new RuntimeException(getClass().getSimpleName()+" already released");
+        }
+        released = true;
         excecutor.shutdown();
         for (CLQueueContext context : contexts) {
             context.queue.finish().release();
@@ -187,6 +193,11 @@ public class CLCommandQueuePool<C extends CLQueueContext> implements CLResource
         return finishAction;
     }
 
+    @Override
+    public boolean isReleased() {
+        return released;
+    }
+
     /**
      * Sets the action which is run after every completed task.
      * This is mainly intended for debugging, default value is {@link FinishAction#DO_NOTHING}.