[Python-bugs-list] [ python-Bugs-221327 ] threads within an embedded python interpreter

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Bugs item #221327, was opened at 2000-11-03 21:31
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https://sourceforge.net/tracker/?func=detail&atid=105470&aid=221327&group_id=5470

Category: Documentation
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Fred L. Drake, Jr. (fdrake)
Summary: threads within an embedded python interpreter

Initial Comment:
I have an application which I am required to embedd a python interpreter inside of a C++ application. The python script creates a separate thread of control to handle a TCP/IP socket connection. The thread can send data just find but hangs on the socket 'recv' fnction.

After a dya of debugging my code I went into the python socketmodule.c and at line 1082 I commented out the thread protection code:

/*Py_BEGIN_ALLOW_THREADS*/
n = recv(s->sock_fd, PyString_AsString(buf), len, flags);
/*Py_END_ALLOW_THREADS*/

I then recompiled the python library and then recompiled my C++ app and everything worked just fine.

The problem does not exist when I run the script alone using the python interpreter. Only when I embedd the interpreter, so this is some sort of configuration issue.

David Schere
Email: david_schere@yahoo.com





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>Comment By: Martin v. Löwis (loewis)
Date: 2002-08-04 11:47

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Doc/api/init.tex already has a paragraph about calling
Python from a C thread; this patch adds a cookbook example.

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Comment By: Guido van Rossum (gvanrossum)
Date: 2002-03-01 23:58

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but is it a doco bug or not?

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Comment By: Jeremy Hylton (jhylton)
Date: 2002-03-01 23:34

Message:
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Probably ought to fix this for 2.3


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Comment By: Nobody/Anonymous (nobody)
Date: 2001-08-31 21:57

Message:
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Now u pay,.

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Comment By: Guido van Rossum (gvanrossum)
Date: 2000-11-03 21:44

Message:
Most likely, the problem is not the socket module but how you call Python code from a thread that was started from C/C++. Look at t_bootstrap() in threadmodule.c for an example on what to do. (And yes, it's tricky.) There should also be something in the Python/C API documentation about this.

I'm not closing the bug report since this is really a documentation issue; it needs to be documented better. I'll assign it to Fred.

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