diff -r 000000000000 -r 6474c204b198 xpcom/tests/TestThreadPool.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/tests/TestThreadPool.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "nsXPCOM.h"
+#include "nsXPCOMCIDInternal.h"
+#include "nsIThreadPool.h"
+#include "nsComponentManagerUtils.h"
+#include "nsCOMPtr.h"
+#include "nsIRunnable.h"
+
+class Task : public nsIRunnable
+{
+public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  Task(int i) : mIndex(i) {}
+
+  NS_IMETHOD Run()
+  {
+    printf("###(%d) running from thread: %p\n", mIndex, (void *) PR_GetCurrentThread());
+    int r = (int) ((float) rand() * 200 / RAND_MAX);
+    PR_Sleep(PR_MillisecondsToInterval(r));
+    printf("###(%d) exiting from thread: %p\n", mIndex, (void *) PR_GetCurrentThread());
+    return NS_OK;
+  }
+
+private:
+  int mIndex;
+};
+NS_IMPL_ISUPPORTS(Task, nsIRunnable)
+
+static nsresult
+RunTests()
+{
+  nsCOMPtr<nsIThreadPool> pool = do_CreateInstance(NS_THREADPOOL_CONTRACTID);
+  NS_ENSURE_STATE(pool);
+
+  for (int i = 0; i < 100; ++i) {
+    nsCOMPtr<nsIRunnable> task = new Task(i);
+    NS_ENSURE_TRUE(task, NS_ERROR_OUT_OF_MEMORY);
+
+    pool->Dispatch(task, NS_DISPATCH_NORMAL);
+  }
+
+  pool->Shutdown();
+  return NS_OK;
+}
+
+int
+main(int argc, char **argv)
+{
+  if (NS_FAILED(NS_InitXPCOM2(nullptr, nullptr, nullptr)))
+    return -1;
+  RunTests();
+  NS_ShutdownXPCOM(nullptr);
+  return 0;
+}