fix Access Denied error on windows XP

if mswindows:

    # from http://www.madebuild.org/blog/?p=30

    from ctypes import byref, windll

    # adapted from http://www.madebuild.org/blog/?p=30

    from ctypes import byref, windll, WinError

    from ctypes.wintypes import DWORD

    # GetExitCodeProcess uses a special exit code to indicate that the process is

    # still running.

    # still running. It also requires non-default permissions, otherwise we get

    # Access Denied even for running processes. For more details, see

    # http://msdn.microsoft.com/en-us/library/windows/desktop/ms683189%28v=vs.85%29.aspx

    # http://msdn.microsoft.com/en-us/library/windows/desktop/ms684880%28v=vs.85%29.aspx

    _STILL_ACTIVE = 259

    _SYNCHRONIZE = 0x00100000

    _PROCESS_QUERY_INFORMATION = 0x0400

    def proc_is_alive(pid):

        """Check if a pid is still running."""

        handle = windll.kernel32.OpenProcess(1, 0, pid)

        handle = windll.kernel32.OpenProcess(

            _SYNCHRONIZE | _PROCESS_QUERY_INFORMATION, 0, pid)

        if handle == 0:

            return False

        # If the process exited recently, a pid may still exist for the handle.

        # So, check if we can get the exit code.

        exit_code = DWORD()

        is_running = (

            windll.kernel32.GetExitCodeProcess(handle, byref(exit_code)) == 0)

        rval = windll.kernel32.GetExitCodeProcess(handle, byref(exit_code))

        windll.kernel32.CloseHandle(handle)

        # See if we couldn't get the exit code or the exit code indicates that the

        # process is still running.

        return is_running or exit_code.value == _STILL_ACTIVE

        if rval == 0: # GetExitCodeProcess failure

            raise WinError()

        return exit_code.value == _STILL_ACTIVE

else:

    # adapted from http://stackoverflow.com/questions/568271/check-if-pid-is-not-in-use-in-python