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diff --git a/intern/cycles/util/util_task.h b/intern/cycles/util/util_task.h
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+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __UTIL_TASK_H__
+#define __UTIL_TASK_H__
+
+#include "util_list.h"
+#include "util_thread.h"
+#include "util_vector.h"
+
+CCL_NAMESPACE_BEGIN
+
+class Task;
+class TaskPool;
+class TaskScheduler;
+
+typedef boost::function<void(Task*,int)> TaskRunFunction;
+
+/* Task
+ *
+ * Base class for tasks to be executed in threads. */
+
+class Task
+{
+public:
+	Task() {};
+	virtual ~Task() {}
+};
+
+/* Task Pool
+ *
+ * Pool of tasks that will be executed by the central TaskScheduler.For each
+ * pool, we can wait for all tasks to be done, or cancel them before they are
+ * done.
+ *
+ * The run callback that actually executes the task may be create like this:
+ * function_bind(&MyClass::task_execute, this, _1, _2) */
+
+class TaskPool
+{
+public:
+	TaskPool(const TaskRunFunction& run);
+	~TaskPool();
+
+	void push(Task *task, bool front = false);
+
+	void wait();		/* wait until all tasks are done */
+	void cancel();		/* cancel all tasks, keep worker threads running */
+	void stop();		/* stop all worker threads */
+
+	bool cancelled();	/* for worker threads, test if cancelled */
+
+protected:
+	friend class TaskScheduler;
+
+	void done_increase(int done);
+
+	TaskRunFunction run;
+
+	thread_mutex done_mutex;
+	thread_condition_variable done_cond;
+
+	volatile int num, num_done;
+	volatile bool do_cancel;
+};
+
+/* Task Scheduler
+ * 
+ * Central scheduler that holds running threads ready to execute tasks. A singe
+ * queue holds the task from all pools. */
+
+class TaskScheduler
+{
+public:
+	static void init(int num_threads = 0);
+	static void exit();
+
+	static int num_threads() { return threads.size(); }
+
+protected:
+	friend class TaskPool;
+
+	struct Entry {
+		Task *task;
+		TaskPool *pool;
+	};
+
+	static thread_mutex mutex;
+	static int users;
+	static vector<thread*> threads;
+	static volatile bool do_exit;
+
+	static list<Entry> queue;
+	static thread_mutex queue_mutex;
+	static thread_condition_variable queue_cond;
+
+	static void thread_run(int thread_id);
+	static bool thread_wait_pop(Entry& entry);
+
+	static void push(Entry& entry, bool front);
+	static void clear(TaskPool *pool);
+};
+
+CCL_NAMESPACE_END
+
+#endif
+