[issue30574] Document why embedding the interpreter can sometimes crash.

[Paul Moore]

Changes by Paul Moore :


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nosy:  -paul.moore

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[issue30574] Document why embedding the interpreter can sometimes crash.

[R. David Murray]

Changes by R. David Murray :


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nosy:  -r.david.murray

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Decorater]

Decorater added the comment:

turns out it was crashing because I forgot to add in Py_Initialize.

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Decorater]

Decorater added the comment:

I found where the crash was at. It was at my call to PyRun_SimpleString.

Something in the string caused it to crash.

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Zachary Ware]

Changes by Zachary Ware :


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assignee: docs@python -> 
nosy:  -docs@python, zach.ware

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Decorater]

Decorater added the comment:

E:\Users\Elsword\Documents\GitHub\TinyURL\app>call "E:\Program Files (x86)\Micro
soft Visual Studio 14.0\Common7\Tools\VsDevCmd.bat"

E:\Users\Elsword\Documents\GitHub\TinyURL\app>cd "E:\Users\Elsword\Documents\Git
Hub\TinyURL\app\"

E:\Users\Elsword\Documents\GitHub\TinyURL\app>RC.exe /r TinyURL.rc
Microsoft (R) Windows (R) Resource Compiler Version 10.0.10011.16384
Copyright (C) Microsoft Corporation.  All rights reserved.


E:\Users\Elsword\Documents\GitHub\TinyURL\app>cl.exe /Tc "TinyURL.c" /I 
E:\Python360\include E:\Python360\libs\python36.lib /link /OUT:"TinyURL.exe" 
/SUBSYSTEM:CONSOLE "TinyURL.res" /FIXED
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.24215.1 for x86
Copyright (C) Microsoft Corporation.  All rights reserved.

TinyURL.c
TinyURL.c(204): warning C4129: '/': unrecognized character escape sequence
Microsoft (R) Incremental Linker Version 14.00.24215.1
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:TinyURL.exe
/OUT:TinyURL.exe
/SUBSYSTEM:CONSOLE
TinyURL.res
/FIXED
TinyURL.obj
E:\Python360\libs\python36.lib

Wait a minute, it seems the build tools are a bit out of date.

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Decorater]

Decorater added the comment:

Wait a minute, I think it is because the 32 and 64 bit python36.lib files are 
in the path environment variable so that might be the reason for the crash.

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Decorater]

Decorater added the comment:

I am compiling and linking to 32 bit python based on the folder I entered for 
the lib file. Unless the lib file in the lib folder is somehow for the 64 bit 
one.

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[issue30574] Document why embedding the interpreter can sometimes crash.

[R. David Murray]

R. David Murray added the comment:

Agreed, there's nothing for us to do here.  It sounds like you may need to go 
to a help forum to work through your crash.

If you learn things that you think it would be valuable to add to the docs, 
please do submit a doc enhancement issue/PR.

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nosy: +r.david.murray
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Paul Moore]

Paul Moore added the comment:

My bet is still on something like you compiling your code 32-bit and linking to 
64-bit Python, or something like that.

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Decorater]

Decorater added the comment:

Well looks like with cl.exe it is still crashing.

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Decorater]

Decorater added the comment:

hmm, maybe it was because I was compiling it inside of the VS2015 IDE in an 
project file and not with cl.exe directly.

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Paul Moore]

Paul Moore added the comment:

Worked fine for me:

>cl .\pyc.c /I $env:LOCALAPPDATA\Programs\Python\Python36\include 
>$env:LOCALAPPDATA\Programs\Python\Python36\libs\python36.lib
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.24213.1 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

pyc.c
Microsoft (R) Incremental Linker Version 14.00.24213.1
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:pyc.exe
pyc.obj
...\Programs\Python\Python36\libs\python36.lib

>.\pyc.exe
Today is Mon Jun  5 15:27:45 2017

So it doesn't look like the problem is with the code, so much as with how 
you've done the build. The problem here is that there are so many possibilities 
for C compilation environments, that there's simply no way we could give a 
"this is how you set up to build an embedding application".

If you have specific suggestions for how to improve the documentation, a patch 
would be welcome. But in the absence of specifics, I don't think there's 
anything actionable in this report.

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Decorater]

Decorater added the comment:

Well the example I linked if I compile it and try to run it it instantly 
crashes with no explainable reason. I am using the same compiler used to build 
the core too and the normal interpreter works just fine with the code I am 
trying to embed. So it seems to definitely be the Py_DecodeLocale or the 
Py_SetProgramName line.

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Paul Moore]

Paul Moore added the comment:

I'm a bit confused what you're asking for here.

Certainly if you embed Python, you can get crashes, just as with any other C 
program. Pass an invalid pointer to a Python API, build your application and 
the Python DLL with incompatible C runtimes, free memory you don't own, ...

That's not really something we need to cover in the Python documentation, 
though, it's just things you need to understand if you're doing anything beyond 
the most trivial C programming.

If there's a specific issue that you're having, we'd need more details to say 
anything else.

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[issue30574] Document why embedding the interpreter can sometimes crash.

[Decorater]

New submission from Decorater:

According to this example at 
https://docs.python.org/3/extending/embedding.html#very-high-level-embedding 
you can use something similar on embedding the interpreter.

However for some reason it can crash on Windows and probably some other 
platforms no matter what python code you enter in the string. I am currently 
getting that issue on Windows even with the python DLL's being in the same 
folder of the embedded executable it seems (when I open the crash dump in 
VS2010 express) that it tried to access an memory address that it has no 
permissions to.

However I have been thinking as to why that might be. The system should have 
plenty of memory left for it to allocate and run just fine unless it wants to 
use an already active python process (why would that be when other applications 
that embed the interpreter seem to work just fine).

I think documenting there on when and iff the compiled code crashes with 
suggestions on how to fix them would be best to do on the page.

it could be that the example actually compiles but does not work anymore too. 
But why would it be on the page if it would compile but crash on any string put 
into it? Something makes me think the crash is on the Py_DecodeLocale line with 
the size_t * param being NULL.

--
assignee: docs@python
components: Documentation, Windows
messages: 295187
nosy: Decorater, docs@python, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Document why embedding the interpreter can sometimes crash.
versions: Python 3.5, Python 3.6, Python 3.7

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