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Assets/Obi/Scripts/Common/Backends/Interface/JobHandlePool.cs

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+using System.Collections.Generic;
+
+namespace Obi
+{
+
+    /**
+     * Simple pool to avoid allocating job handles at runtime. Only a small number of handles
+     * are expected, so once a handle is borrowed from the pool it cannot be individually returned: all
+     * borrowed handles are returned to the pool at the end of each step. 
+     */
+    public class JobHandlePool<T> where T : IObiJobHandle , new()
+    {
+        private List<T> pool;
+        private int borrowedHandles;
+
+        public JobHandlePool(int initialSize)
+        {
+            borrowedHandles = 0;
+            pool = new List<T>(initialSize);
+            for (int i = 0; i < initialSize; ++i)
+                pool.Add(new T());
+        }
+
+        public T Borrow()
+        {
+            // expand pool if needed (no pool doubling, simply add one extra handle).
+            if (borrowedHandles == pool.Count)
+                pool.Add(new T());
+
+            return pool[borrowedHandles++];
+        }
+
+        public void ReleaseAll()
+        {
+            borrowedHandles = 0;
+            for (int i = 0; i < pool.Count; ++i)
+                pool[i].Release();
+        }
+    }
+}