diff --git a/src/thread/thread.h b/src/thread/thread.h
new file mode 100644
--- /dev/null
+++ b/src/thread/thread.h
@@ -0,0 +1,73 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD 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, version 2.
+ * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file thread.h Base of all threads. */
+
+#ifndef THREAD_H
+#define THREAD_H
+
+typedef void (*OTTDThreadFunc)(void *);
+
+class OTTDThreadExitSignal { };
+
+/**
+ * A Thread Object which works on all our supported OSes.
+ */
+class ThreadObject {
+public:
+	/**
+	 * Virtual destructor to allow 'delete' operator to work properly.
+	 */
+	virtual ~ThreadObject() {};
+
+	/**
+	 * Exit this thread.
+	 */
+	virtual bool Exit() = 0;
+
+	/**
+	 * Join this thread.
+	 */
+	virtual void Join() = 0;
+
+	/**
+	 * Create a thread; proc will be called as first function inside the thread,
+	 *  with optinal params.
+	 * @param proc The procedure to call inside the thread.
+	 * @param param The params to give with 'proc'.
+	 * @param thread Place to store a pointer to the thread in. May be NULL.
+	 * @return True if the thread was started correctly.
+	 */
+	static bool New(OTTDThreadFunc proc, void *param, ThreadObject **thread = NULL);
+};
+
+/**
+ * Cross-platform Mutex
+ */
+class ThreadMutex {
+public:
+	static ThreadMutex *New();
+
+	/**
+	 * Virtual Destructor to avoid compiler warnings.
+	 */
+	virtual ~ThreadMutex() {};
+
+	/**
+	 * Begin the critical section
+	 */
+	virtual void BeginCritical() = 0;
+
+	/**
+	 * End of the critical section
+	 */
+	virtual void EndCritical() = 0;
+};
+
+#endif /* THREAD_H */