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/osDynLibrary.cpp

@@ -0,0 +1,75 @@
+/*
+* 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.
+*/
+#include "osDynLibrary.h"
+
+#ifndef _WIN32
+#include <dlfcn.h>
+#endif
+#include <stdio.h>
+
+namespace osUtils {
+
+dynLibrary *dynLibrary::open(const char *p_libName)
+{
+    dynLibrary *lib = new dynLibrary();
+    if (!lib) {
+        return NULL;
+    }
+
+#ifdef _WIN32
+    lib->m_lib = LoadLibrary(p_libName);
+#else // !WIN32
+    lib->m_lib = dlopen(p_libName, RTLD_NOW);
+#endif
+
+    if (lib->m_lib == NULL) {
+        delete lib;
+        return NULL;
+    }
+
+    return lib;
+}
+
+dynLibrary::dynLibrary() :
+    m_lib(NULL)
+{
+}
+
+dynLibrary::~dynLibrary()
+{
+    if (NULL != m_lib) {
+#ifdef _WIN32
+        FreeLibrary(m_lib);
+#else // !WIN32
+        dlclose(m_lib);
+#endif
+    }
+}
+
+dynFuncPtr dynLibrary::findSymbol(const char *p_symName)
+{
+    if (NULL == m_lib) {
+        return NULL;
+    }
+
+#ifdef _WIN32
+    return (dynFuncPtr) GetProcAddress(m_lib, p_symName);
+#else // !WIN32
+    return (dynFuncPtr) dlsym(m_lib, p_symName);
+#endif
+}
+
+} // of namespace osUtils