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if extended c module is calling Windows API waitForSingleObject, it will block other thread. #47277

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if extended c module is calling Windows API waitForSingleObject, it will block other thread.#47277
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interpreter-core(Objects, Python, Grammar, and Parser dirs)

Description

@patrick
patrick
mannequin
opened on Jun 2, 2008
BPO 3027
Files
  • attach.zip: source and output files
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
closed_at = <Date 2008-06-03.07:18:36.343>
created_at = <Date 2008-06-02.09:53:19.632>
labels = ['interpreter-core']
title = 'if extended c module is calling Windows API waitForSingleObject, it will block other thread.'
updated_at = <Date 2008-06-03.07:18:36.308>
user = 'https://bugs.python.org/patrick'

    bugs.python.org fields:

    activity = <Date 2008-06-03.07:18:36.308>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = <Date 2008-06-03.07:18:36.343>
closer = 'georg.brandl'
components = ['Interpreter Core']
creation = <Date 2008-06-02.09:53:19.632>
creator = 'patrick'
dependencies = []
files = ['10502']
hgrepos = []
issue_num = 3027
keywords = []
message_count = 3.0
messages = ['67633', '67634', '67648']
nosy_count = 2.0
nosy_names = ['therve', 'patrick']
pr_nums = []
priority = 'normal'
resolution = 'works for me'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue3027'
versions = ['Python 2.5']

    Activity

    1. patrick commented on Jun 2, 2008

      @patrick
      patrickmannequin
      on Jun 2, 2008
      MannequinAuthor

      The c extend module is as the attached file "WindowsFuncs.cpp", it
      wraps some Windows event APIs

      The python script is as the attached file "test.py", run that script,
      we could find in the new thread, the calling to Windows API
      waitForSingleObject will block the main thread printing, that's really
      strange.

      The output of running is as the attached file "test.output".

    2. patrick
      added
      interpreter-core(Objects, Python, Grammar, and Parser dirs)
      on Jun 2, 2008

    3. therve commented on Jun 2, 2008

      @therve
      thervemannequin
      on Jun 2, 2008
      Mannequin

      You have to release the GIL. See http://docs.python.org/api/threads.html
      for some information.

    4. patrick commented on Jun 3, 2008

      @patrick
      patrickmannequin
      on Jun 3, 2008
      MannequinAuthor

      Yes, after wrapping the calling to block operation with marco
      Py_BEGIN_ALLOW_THREADS and Py_END_ALLOW_THREADS, that issue is gone.
      Thank you.

    5. birkenfeld
      closed this as completedon Jun 3, 2008
    6. ezio-melotti
      transferred this issue fromon Apr 10, 2022
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