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multiprocessing cannot spawn child from a Windows service

margin — Wed, 27 Jan 2010 09:51:00 GMT

source: http://bugs.python.org/issue5162

classificationTitle: multiprocessing cannot spawn child from a Windows service
Type: behavior Stage: test needed
Components: Library (Lib) Versions: Python 2.6
processStatus: open Resolution:
Dependencies: Superseder:
Assigned To: jnoller Nosy List: jnoller, orlenko (2)
Priority: normal Keywords patch

Created on 2009-02-06 02:00 by orlenko, last changed 2009-03-29 15:44 by jnoller.

Files
File name Uploaded Description Edit Remove
forking-patch orlenko, 2009-02-06 02:00 Patch of the forking module
Messages (1)
msg81247 - (view) Author: Volodymyr Orlenko (orlenko) Date: 2009-02-06 02:00
I think I've found a small bug with multiprocessing package on
Windows. If you try to start a multiprocessing.Process from a Python-
based Windows service, the child process will fail to run. When
running the parent process as a regular Python program, everything
works as expected.
I've tracked the problem down to how main_path is prepared in
multiprocessing.forking.get_preparation_data() (lines 370-377):
def get_preparation_data(name):
    [...skipped a few lines...]
    if not WINEXE:
        main_path = getattr(sys.modules['__main__'], '__file__', None)
        if not main_path and sys.argv[0] not in ('', '-c'):
            main_path = sys.argv[0]
        if main_path is not None:
            if not os.path.isabs(main_path) and \
                                      process.ORIGINAL_DIR is not
None:
                main_path = os.path.join(process.ORIGINAL_DIR,
main_path)
            d['main_path'] = os.path.normpath(main_path)
    return d
When the program is running as a Windows service, but is not packaged
into a single executable, main_path will become the path to the
service executable (typically, pythonservice.exe). When this data
makes it to the child process, the prepare() function will treat
main_path as a path to a python module, and will try to import it.
This causes it to fail.
My quick-and-dirty solution was to check in get_preparation_data() if
main_path ends with '.exe', and if it does, to not pass it at all.
This solves the problem in my case, but perhaps there's a better way
to fix this? Here is my version of get_preparation_data():
def get_preparation_data(name):
    '''
    Return info about parent needed by child to unpickle process
object
    '''
    from .util import _logger, _log_to_stderr
    d = dict(
        name=name,
        sys_path=sys.path,
        sys_argv=sys.argv,
        log_to_stderr=_log_to_stderr,
        orig_dir=process.ORIGINAL_DIR,
        authkey=process.current_process().authkey,
        )
    if _logger is not None:
        d['log_level'] = _logger.getEffectiveLevel()
    if not WINEXE:
        main_path = getattr(sys.modules['__main__'], '__file__', None)
        if not main_path and sys.argv[0] not in ('', '-c'):
            main_path = sys.argv[0]
        if main_path is not None:
            if not os.path.isabs(main_path) and \
                                      process.ORIGINAL_DIR is not
None:
                main_path = os.path.join(process.ORIGINAL_DIR,
main_path)
            if not main_path.endswith('.exe'):
                d['main_path'] = os.path.normpath(main_path)
    return d

margin 2010-01-27 17:51 发表评论

margin — Mon, 11 Jan 2010 03:56:00 GMT

转自:http://wrsuifeng.javaeye.com/blog/546992

2009-12-12

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文章分类:Python�~�程

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Python2.6可以�?a target=_blank>http://www.python.org/download 下蝲官方的版本安装，也可�?a title=http://www.activestate.com/activepython/ target=_blank>http://www.activestate.com/activepython/下蝲ActivePython安装�Q�后者在windows下��用更加方�ѝ�?/p> MySQLdb版本�Q?MySQL-python-1.2.2.win32-py2.6.exe 下蝲地址�Q?a target=_blank>http://home.netimperia.com/files/misc/MySQL-python-1.2.2.win32-py2.6.exe 参见�Q?a target=_blank>http://sourceforge.net/forum/forum.php?thread_id=2316047&forum_id=70460 常见问题�Q?br>1.ImportError: DLL load failed: 找不到指定的模块�?br>---------------------------------------------------------------------------------------------------- D:\usr\local\Python26>python Python 2.6 (r26:66721, Oct 2 2008, 11:35:03) [MSC v.1500 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import MySQLdb Traceback (most recent call last): File "", line 1, in File "D:\usr\local\Python26\Lib\site-packages\MySQLdb\__init__.py", line 19, in import _mysql ImportError: DLL load failed: 找不到指定的模块�?br>---------------------------------------------------------------------------------------------------- 解决�Ҏ��Q�下载libmmd.dll(附�g)和libguide40.dll(附�g)两个dll文�g�q�复制到python安装目录的Lib\site-packages下�?br>参见�Q?a target=_blank>http://sourceforge.net/forum/message.php?msg_id=5613887 2.ImportError: DLL load failed: 找不到指定的模块�?br>---------------------------------------------------------------------------------------------------- D:\usr\local\Python26>python Python 2.6 (r26:66721, Oct 2 2008, 11:35:03) [MSC v.1500 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import MySQLdb D:\usr\local\Python26\lib\site-packages\MySQLdb\__init__.py:34: DeprecationWarning: the sets module is deprecated from sets import ImmutableSet ---------------------------------------------------------------------------------------------------- 解决�Ҏ��Q?br>1) file "__init__", replace: from sets import ImmutableSet class DBAPISet(ImmutableSet): with class DBAPISet(frozenset) : 2) file "converters.py", remove: from sets import BaseSet, Set 3) file "converters.py", change "Set" by "set" (IMPORTANT: only two places): line 48: return set([ i for i in s.split(',') if i ]) line 128: set: Set2Str, 参见�Q?a target=_blank>http://sourceforge.net/forum/message.php?msg_id=5808948

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