emulator opengl: add OpenglOsUtils library, a set of OS utils.

This is just a set of OS dependant functionality needed by the
emulator OpenGL host renderer. It currently has implementation for
Linux and Windows only.

osDynLibrary - dlopen/dlsym abstraction
osProcess    - interface to launch a new process, wait and kill it.
osThread     - abstraction interface for creating a thread.

Change-Id: Ib0264592d8c87e865da87acf5c94e2b331801ca4

tools/emulator/opengl/shared/OpenglOsUtils/osThread.h

@@ -0,0 +1,60 @@
+/*
+* Copyright (C) 2011 The Android Open Source Project
+*
+* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+#ifndef _OSUTILS_THREAD_H
+#define _OSUTILS_THREAD_H
+
+#ifdef _WIN32
+#include <windows.h>
+#else // !WIN32
+#include <pthread.h>
+#endif
+
+namespace osUtils {
+
+class Thread
+{
+public:
+    Thread();
+    virtual ~Thread();
+
+    virtual int Main() = 0;
+
+    bool start();
+    bool  wait(int *exitStatus);
+    bool trywait(int *exitStatus);
+
+private:
+#ifdef _WIN32
+    static DWORD WINAPI thread_main(void *p_arg);
+#else // !WIN32
+    static void* thread_main(void *p_arg);
+#endif
+
+private:
+#ifdef _WIN32
+    HANDLE m_thread;
+    DWORD m_threadId;
+#else // !WIN32
+    pthread_t m_thread;
+    int       m_exitStatus;
+    pthread_mutex_t m_lock;
+#endif
+    bool m_isRunning;
+};
+
+} // of namespace osUtils
+
+#endif