0
  :   -ˆl–Ãa¾”d*j"TÚzã@¸Ø”Å£Äƒ|O¹Ãa–ß=¿JJj"TâÆ…q¦ÔÅ£È $P    -#
# Code used to start processes when using the spawn or forkserver
# start methods.
#
# multiprocessing/spawn.py
#
# Copyright (c) 2006-2008, R Oudkerk
# Licensed to PSF under a Contributor Agreement.
#

import os
import sys
import runpy
import types

from . import get_start_method, set_start_method
from . import process
from .context import reduction
from . import util

__all__ = ['_main', 'freeze_support', 'set_executable', 'get_executable',
           'get_preparation_data', 'get_command_line', 'import_main_path']

#
# _python_exe is the assumed path to the python executable.
# People embedding Python want to modify it.
#

if sys.platform != 'win32':
    WINEXE = False
    WINSERVICE = False
else:
    WINEXE = getattr(sys, 'frozen', False)
    WINSERVICE = sys.executable.lower().endswith("pythonservice.exe")

if WINSERVICE:
    _python_exe = os.path.join(sys.exec_prefix, 'python.exe')
else:
    _python_exe = sys.executable

def set_executable(exe):
    global _python_exe
    _python_exe = exe

def get_executable():
    return _python_exe

#
#
#

def is_forking(argv):
    '''
    Return whether commandline indicates we are forking
    '''
    if len(argv) >= 2 and argv[1] == '--multiprocessing-fork':
        return True
    else:
        return False


def freeze_support():
    '''
    Run code for process object if this in not the main process
    '''
    if is_forking(sys.argv):
        kwds = {}
        for arg in sys.argv[2:]:
            name, value = arg.split('=')
            if value == 'None':
                kwds[name] = None
            else:
                kwds[name] = int(value)
        spawn_main(**kwds)
        sys.exit()


def get_command_line(**kwds):
    '''
    Returns prefix of command line used for spawning a child process
    '''
    if getattr(sys, 'frozen', False):
        return ([sys.executable, '--multiprocessing-fork'] +
                ['%s=%r' % item for item in kwds.items()])
    else:
        prog = 'from multiprocessing.spawn import spawn_main; spawn_main(%s)'
        prog %= ', '.join('%s=%r' % item for item in kwds.items())
        opts = util._args_from_interpreter_flags()
        return [_python_exe] + opts + ['-c', prog, '--multiprocessing-fork']


def spawn_main(pipe_handle, parent_pid=None, tracker_fd=None):
    '''
    Run code specified by data received over pipe
    '''
    assert is_forking(sys.argv), "Not forking"
    if sys.platform == 'win32':
        import msvcrt
        import _winapi

        if parent_pid is not None:
            source_process = _winapi.OpenProcess(
                _winapi.SYNCHRONIZE | _winapi.PROCESS_DUP_HANDLE,
                False, parent_pid)
        else:
            source_process = None
        new_handle = reduction.duplicate(pipe_handle,
                                         source_process=source_process)
        fd = msvcrt.open_osfhandle(new_handle, os.O_RDONLY)
        parent_sentinel = source_process
    else:
        from . import resource_tracker
        resource_tracker._resource_tracker._fd = tracker_fd
        fd = pipe_handle
        parent_sentinel = os.dup(pipe_handle)
    exitcode = _main(fd, parent_sentinel)
    sys.exit(exitcode)


def _main(fd, parent_sentinel):
    with os.fdopen(fd, 'rb', closefd=True) as from_parent:
        process.current_process()._inheriting = True
        try:
            preparation_data = reduction.pickle.load(from_parent)
            prepare(preparation_data)
            self = reduction.pickle.load(from_parent)
        finally:
            del process.current_process()._inheriting
    return self._bootstrap(parent_sentinel)


def _check_not_importing_main():
    if getattr(process.current_process(), '_inheriting', False):
        raise RuntimeError('''
        An attempt has been made to start a new process before the
        current process has finished its bootstrapping phase.

        This probably means that you are not using fork to start your
        child processes and you have forgotten to use the proper i