Move repositories to 'repos/' subdirectory

This patch changes the top-level directory layout as a preparatory
step for improving the tools for managing 3rd-party source codes.
The rationale is described in the issue referenced below.

Issue #1082

repos/base-linux/src/test/lx_hybrid_pthread_ipc/main.cc

@@ -0,0 +1,62 @@
+/*
+ * \brief  Test for performing IPC from a pthread created outside of Genode
+ * \author Norman Feske
+ * \date   2011-12-20
+ */
+
+/*
+ * Copyright (C) 2011-2013 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+/* Genode includes */
+#include <base/thread.h>
+#include <base/printf.h>
+
+/* libc includes */
+#include <pthread.h>
+
+
+static Genode::Lock *main_wait_lock()
+{
+	static Genode::Lock inst(Genode::Lock::LOCKED);
+	return &inst;
+}
+
+
+static void *pthread_entry(void *)
+{
+	PINF("first message");
+
+	/*
+	 * Without the lazy initialization of 'Thread_base' objects for threads
+	 * created w/o Genode's Thread API, the printing of the first message will
+	 * never return because the IPC reply could not be delivered.
+	 *
+	 * With the on-demand creation of 'Thread_base' objects, the second message
+	 * will appear in the LOG output.
+	 */
+
+	PINF("second message");
+
+	main_wait_lock()->unlock();
+	return 0;
+}
+
+
+int main(int, char **)
+{
+	Genode::printf("--- pthread IPC test ---\n");
+
+	/* create thread w/o Genode's thread API */
+	pthread_t pth;
+	pthread_create(&pth, 0, pthread_entry, 0);
+
+	/* wait until 'pthread_entry' finished */
+	main_wait_lock()->lock();
+
+	Genode::printf("--- finished pthread IPC test ---\n");
+	return 0;
+}

repos/base-linux/src/test/lx_hybrid_pthread_ipc/target.mk

@@ -0,0 +1,3 @@
+TARGET = test-lx_hybrid_pthread_ipc
+SRC_CC = main.c
+LIBS   = lx_hybrid