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/osProcessWin.cpp

@@ -0,0 +1,171 @@
+/*
+* 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 "osProcess.h"
+#include <windows.h>
+#include <string>
+#include <stdlib.h>
+#include <psapi.h>
+
+namespace osUtils {
+
+childProcess *
+childProcess::create(const char *p_cmdLine, const char *p_startdir)
+{
+    childProcess *child = new childProcess();
+    if (!child) {
+        return NULL;
+    }
+
+    STARTUPINFOA        si;
+    ZeroMemory(&si, sizeof(si));
+
+    ZeroMemory(&child->m_proc, sizeof(child->m_proc));
+    BOOL ret = CreateProcessA(
+                    NULL ,
+                    (LPSTR)p_cmdLine,
+                    NULL,
+                    NULL,
+                    FALSE,
+                    CREATE_DEFAULT_ERROR_MODE,
+                    NULL,
+                    (p_startdir != NULL ? p_startdir : ".\\"),
+                    &si,
+                    &child->m_proc);
+    if (ret == 0) {
+        delete child;
+        return NULL;
+    }
+
+    // close the thread handle we do not need it,
+    // keep the process handle for wait/trywait operations, will
+    // be closed on destruction
+    CloseHandle(m_proc.hThread);
+
+    return child;
+}
+
+childProcess::~childProcess()
+{
+    if (m_proc.hProcess) {
+        CloseHandle(child->m_proc.hProcess);
+    }
+}
+
+bool
+childProcess::wait(int *exitStatus)
+{
+DWORD _exitStatus;
+
+    if (WaitForSingleObject(m_proc.hProcess, INFINITE) == WAIT_FAILED) {
+        return false;
+    }
+
+    if (!GetExitCodeProcess(m_proc.hProcess, &_exitStatus))
+    {
+        return false;
+    }
+
+    if (exitStatus) {
+        *exitStatus = _exitStatus;
+    }
+
+    return true;
+}
+
+int
+childProcess::tryWait(bool& isAlive)
+{
+    DWORD status = WaitForSingleObject(m_proc.hProcess, 0);
+
+    if(status == WAIT_OBJECT_0)
+    {
+        // process has exited
+        isAlive = false;
+        GetExitCodeProcess(m_proc.hProcess, &status);
+    }
+    else if (status == WAIT_TIMEOUT)
+    {
+        isAlive = true;
+        status = 0;
+    }
+
+    return status;
+
+}
+
+int ProcessGetPID()
+{
+    return GetCurrentProcessId();
+}
+
+int ProcessGetTID()
+{
+    return GetCurrentThreadId();
+}
+
+bool ProcessGetName(char *p_outName, int p_outNameLen)
+{
+    return 0 != GetModuleFileNameEx( GetCurrentProcess(), NULL, p_outName, p_outNameLen);
+}
+
+int KillProcess(int pid, bool wait)
+{
+    DWORD exitStatus = 1;
+    HANDLE hProc = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid);
+
+    if (NULL == hProc) {
+        return 0;
+    }
+
+    //
+    // Terminate the process
+    //
+    TerminateProcess(hProc, 0x55);
+
+    if (wait) {
+        //
+        // Wait for it to be terminated
+        //
+        if(WaitForSingleObject(hProc, INFINITE) == WAIT_FAILED) {
+            CloseHandle(hProc);
+            return 0;
+        }
+
+        if (!GetExitCodeProcess(hProc, &exitStatus)) {
+            CloseHandle(hProc);
+            return 0;
+        }
+    }
+
+    CloseHandle(hProc);
+
+    return exitStatus;
+}
+
+bool isProcessRunning(int pid)
+{
+    bool isRunning = false;
+
+    HANDLE process = OpenProcess(SYNCHRONIZE, FALSE, pid);
+    if (NULL != process) {
+        DWORD ret = WaitForSingleObject(process, 0);
+        CloseHandle(process);
+        isRunning = (ret == WAIT_TIMEOUT);
+    }
+    return isRunning;
+}
+
+} // of namespace osUtils