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Source/Engine/Threading/ConcurrentTaskQueue.h

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "ConcurrentQueue.h"
+#include "Task.h"
+
+/// <summary>
+/// Lock-free implementation of thread-safe tasks queue.
+/// </summary>
+template<typename T = Task>
+class ConcurrentTaskQueue : public ConcurrentQueue<T*>
+{
+public:
+
+    /// <summary>
+    /// Adds item to the collection (thread-safe).
+    /// </summary>
+    /// <param name="item">Item to add.</param>
+    FORCE_INLINE void Add(T* item)
+    {
+        ConcurrentQueue<T*>::enqueue(item);
+    }
+
+    /// <summary>
+    /// Cancels all the tasks from the queue and removes them.
+    /// </summary>
+    void CancelAll()
+    {
+        T* tasks[16];
+        std::size_t count;
+        while ((count = ConcurrentQueue<T*>::try_dequeue_bulk(tasks, ARRAY_COUNT(tasks))) != 0)
+        {
+            for (std::size_t i = 0; i != count; i++)
+            {
+                tasks[i]->Cancel();
+            }
+        }
+    }
+};