[issue43263] threading module unable to run

[twoone3]

twoone3 <3197653...@qq.com> added the comment:

That's a pity. I'm going to send the Python source code to my project to 
compile it, and see if it can solve the problem. Of course, I can also try 
compiling it into a static library

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[issue43263] threading module unable to run

[Steve Dower]

Steve Dower  added the comment:

Sorry, I can't help. My employer has strict rules about reviewing GPL code like 
that in your linked repository.

I'd suggest checking your thread management in native code. Each new thread 
created in Python will create a new native thread, and they're all trying to 
acquire the GIL, so make sure you release it. I have no idea how you are 
waiting for the threads to complete their work, but you'll need to release the 
GIL while waiting (and maybe periodically reacquire it to check).

In general, I find it's best to treat embedded CPython as running as a separate 
process, even if it's just in separate threads. If you try and mix arbitrary 
Python code into your own application, things like this happen all the time. 
Whereas if you are doing inter-thread communication as if there are no shared 
objects, you'll often be fine.

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[issue43263] threading module unable to run

[twoone3]

Change by twoone3 <3197653...@qq.com>:


--
components: +Windows
nosy: +paul.moore, steve.dower, tim.golden, zach.ware
resolution: works for me -> wont fix
type:  -> behavior

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[issue43263] threading module unable to run

[twoone3]

twoone3 <3197653...@qq.com> added the comment:

After adding GIL, the problem still exists. If you think this problem is 
incomprehensible, it may be because I used Google Translation ..

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Added file: https://bugs.python.org/file49835/Screenshot_20210225_224118.jpg

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[issue43263] threading module unable to run

[Mark Dickinson]

Change by Mark Dickinson :


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nosy:  -mark.dickinson

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[issue43263] threading module unable to run

[Mark Dickinson]

Mark Dickinson  added the comment:

@twoone3: Shouldn't you be calling PyGILState_Ensure() before calling into 
Python from the C++ code?

In any case, I'm removing myself from the nosy list on this issue, because I 
don't have access to Windows to try to reproduce.

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[issue43263] threading module unable to run

[twoone3]

twoone3 <3197653...@qq.com> added the comment:

Run Project1\x64\Release\Project2.exe

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[issue43263] threading module unable to run

[twoone3]

twoone3 <3197653...@qq.com> added the comment:

After my test, when the exe calls the dll, the dll calls Python. If the Python 
code involves multiple threads, the process will be stuck.

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Added file: https://bugs.python.org/file49831/test.zip

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[issue43263] threading module unable to run

[Mark Dickinson]

Mark Dickinson  added the comment:

[twoone3]

> Have you been studying this problem?

Not personally, no. Sorry, but I'm afraid this really isn't an actionable bug 
report as it stands: we still don't have an effective way to reproduce, and 
it's far from clear that this is actually a bug in CPython as opposed to a bug 
somewhere in the BDSpyrunner code.

If you're able to produce (and attach to this issue) a minimal self-contained 
C++ file that exhibits the issue, that could help increase the chances that we 
can confirm the existence of a CPython bug. Even better, if you're able to 
diagnose the issue yourself to the point where there's a clear CPython bug to 
report, that's much more likely to lead to a fix. (And those two actions - 
producing a minimal example, and diagnosis, should be largely compatible.)

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[issue43263] threading module unable to run

[twoone3]

twoone3 <3197653...@qq.com> added the comment:

Have you been studying this problem?

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[issue43263] threading module unable to run

[twoone3]

twoone3 <3197653...@qq.com> added the comment:

Sorry, I didn't make the question clear yesterday.
My operating system is Windows and the compiler used is VS2019. My project 
address: https://github.com/twoone-3/BDSpyrunner
When I use Python.dll to import Python files, the program is stuck. After 
checking, I found that as long as I use multi-threading, the program will be 
stuck. Of course, this Python file can be directly run by Python.exe, but from  
My program cannot run normally when calling Python.dll

The file:
import threading
import time
 
def worker():
 print "worker"
 time.sleep( 1 )
 return
 
for i in xrange ( 5 ):
 t = threading.Thread(target = worker)
 t.start()

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status: pending -> open

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[issue43263] threading module unable to run

[Mark Dickinson]

Change by Mark Dickinson :


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resolution:  -> works for me
status: open -> pending

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[issue43263] threading module unable to run

[Mark Dickinson]

Mark Dickinson  added the comment:

Sorry, but as Ronald says there's not nearly enough information here. Some 
questions:

- What do you mean by "embedded Python"?
- What is "the exe" that you refer to in your second mesasge? Is that 
python.exe? Is that an executable you compiled from your Python code somehow? 
If so, how?
- What operating system are you using?
- What exact version of Python are you using, and where did you get it from? 
(Conda? python.org install? OS package manager? Pre-installed?)
- What other dependencies are you using? Any 3rd party packages?
- What's the exact Python code that you're running? (Please attach all the 
Python code, preferably after first reducing to a minimal example that exhibits 
the issue.)
- What are the precise steps you used to invoke the Python code? (Are you 
running as a script from a command-line prompt? Interactively in IDLE / PyCharm 
/ VS Code / some other IDE?)
- What exactly happened?
- What did you expect to happen, and why?
- What steps have you taken to eliminate the possibility that this is a bug in 
your own code rather than in Python?

These notes may help: https://www.chiark.greenend.org.uk/~sgtatham/bugs.html

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components: +Library (Lib) -C API
nosy: +mark.dickinson

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[issue43263] threading module unable to run

[twoone3]

twoone3 <3197653...@qq.com> added the comment:

I use cpython to running .py file,the file created a new thread,but the exe 
can't continue to run

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[issue43263] threading module unable to run

[Ronald Oussoren]

Ronald Oussoren  added the comment:

Please add more information about what you're doing.  Your report does not 
contain enough information to try to reproduce the problem.

This is supposed to work just fine, and does work for me.

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[issue43263] threading module unable to run

[twoone3]

New submission from twoone3 <3197653...@qq.com>:

When I use embedded Python to import and use threading module,The program will 
hang,I tested it in versions 3.6.5 and 3.9.1.

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components: C API
messages: 387293
nosy: twoone3
priority: normal
severity: normal
status: open
title: threading module unable to run
versions: Python 3.6, Python 3.9

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