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/osThreadWin.cpp

@@ -0,0 +1,101 @@
+/*
+* 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 "osThread.h"
+
+namespace osUtils {
+
+Thread::Thread() :
+    m_thread(NULL),
+    m_threadId(0),
+    m_isRunning(false)
+{
+}
+
+Thread::~Thread()
+{
+    if(m_thread) {
+        CloseHandle(m_thread);
+    }
+}
+
+bool
+Thread::start()
+{
+    m_isRunning = true;
+    m_thread = CreateThread(NULL, 0, &Thread::thread_main, this, 0, &m_threadId);
+    if(!m_thread) {
+        m_isRunning = false;
+    }
+    return m_isRunning;
+}
+
+bool
+Thread::wait(int *exitStatus)
+{
+    if (!m_isRunning) {
+        return false;
+    }
+
+    if(WaitForSingleObject(m_thread, INFINITE) == WAIT_FAILED) {
+        return false;
+    }
+
+    DWORD retval;
+    if (!GetExitCodeThread(m_thread,&retval)) {
+        return false;
+    }
+
+    m_isRunning = 0;
+
+    if (exitStatus) {
+        *exitStatus = retval;
+    }
+    return true;
+}
+
+bool
+Thread::trywait(int *exitStatus)
+{
+    if (!m_isRunning) {
+        return false;
+    }
+
+    if(WaitForSingleObject(m_thread, 0) == WAIT_OBJECT_0) {
+
+        DWORD retval;
+        if (!GetExitCodeThread(m_thread,&retval)) {
+            return true;
+        }
+
+        if (exitStatus) {
+            *exitStatus = retval;
+        }
+        return true;
+    }
+
+    return false;
+}
+
+DWORD WINAPI
+Thread::thread_main(void *p_arg)
+{
+    Thread *self = (Thread *)p_arg;
+    int ret = self->Main();
+    self->m_isRunning = false;
+    return ret;
+}
+
+} // of namespace osUtils