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diff --git a/js/src/shell/jsworkers.h b/js/src/shell/jsworkers.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sw=4 et tw=99:
+ *
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is JavaScript shell workers.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Jason Orendorff <jorendorff@mozilla.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef jsworkers_h___
+#define jsworkers_h___
+
+#ifdef JS_THREADSAFE
+
+#include "jsapi.h"
+
+/*
+ * Workers for the JS shell.
+ *
+ * Note: The real implementation of DOM Workers is in dom/src/threads.
+ */
+namespace js {
+    namespace workers {
+        class ThreadPool;
+
+        class WorkerHooks {
+        public:
+            virtual JSObject *newGlobalObject(JSContext *cx) = 0;
+            virtual ~WorkerHooks() {}
+        };
+
+        /*
+	 * Initialize workers. This defines the Worker constructor on global.
+	 * Requires request. rootp must point to a GC root.
+	 *
+	 * On success, *rootp receives a pointer to an object, and init returns
+         * a non-null value. The caller must keep the object rooted and must
+         * pass it to js::workers::finish later.
+	 */
+        ThreadPool *init(JSContext *cx, WorkerHooks *hooks, JSObject *global, JSObject **rootp);
+
+        /* Asynchronously signal for all workers to terminate.
+         *
+         * Call this before calling finish() to shut down without waiting for
+         * all messages to be proceesed.
+         */
+        void terminateAll(JSRuntime *rt, ThreadPool *tp);
+
+	/*
+	 * Finish running any workers, shut down the thread pool, and free all
+	 * resources associated with workers. The application must call this
+	 * before shutting down the runtime, and not during GC.
+	 *
+	 * Requires request.
+	 */
+	void finish(JSContext *cx, ThreadPool *tp);
+    }
+}
+
+#endif /* JS_THREADSAFE */
+
+#endif /* jsworkers_h___ */