Fixed wrong directory structure.

repos/mml/src/app/thread_test/target.mk

@@ -1,3 +1,3 @@
 TARGET = thread_test
-SRC_CC = std_thread_test.cc 
+SRC_CC = thread_test.cc 
 LIBS += base libc stdcxx

repos/mml/src/app/thread_test/thread_test.cc

@@ -0,0 +1,28 @@
+#include <base/component.h>
+#include <thread>
+#include <iostream>
+#include <chrono>
+
+namespace ThreadTest {
+    struct Main;
+}
+
+struct ThreadTest::Main
+{
+    Genode::Env &_env;
+
+    void execute() 
+    {
+        while(true) {
+            std::cout << "Hello world" << std::endl;
+            std::this_thread::sleep_for(std::chrone::seconds(1));
+        }
+    }
+};
+
+void Component::construct(Genode::Env &env)
+{
+    static ThreadTest::Main main(env);
+    std::thread([main]
+                { main->execute(); });
+}