pystate.c #ifdef ordering problem

[jimjjewett]

BPO	14569
Nosy	@pitrou, @JimJJewett

^{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 2012-04-13.15:59:57.578>
created_at = <Date 2012-04-12.21:49:06.989>
labels = ['interpreter-core', 'easy', 'build']
title = 'pystate.c #ifdef ordering problem'
updated_at = <Date 2012-04-16.13:50:22.228>
user = 'https://github.com/JimJJewett'

bugs.python.org fields:

activity = <Date 2012-04-16.13:50:22.228>
actor = 'Jim.Jewett'
assignee = 'none'
closed = True
closed_date = <Date 2012-04-13.15:59:57.578>
closer = 'python-dev'
components = ['Interpreter Core']
creation = <Date 2012-04-12.21:49:06.989>
creator = 'Jim.Jewett'
dependencies = []
files = []
hgrepos = []
issue_num = 14569
keywords = ['easy']
message_count = 6.0
messages = ['158174', '158176', '158205', '158209', '158210', '158450']
nosy_count = 3.0
nosy_names = ['pitrou', 'python-dev', 'Jim.Jewett']
pr_nums = []
priority = 'low'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue14569'
versions = ['Python 2.7', 'Python 3.2', 'Python 3.3']

[jimjjewett]

The C linkage is guarded by WITH_THREAD. The 'extern "C" {' and '}' declarations should be in effect regardless of threading.

Note that the bug can only be triggered by compiling without threads, but with a C++ compiler; this is obscure enough that I don't feel strongly about backporting.

[jimjjewett]

http://hg.python.org/cpython/file/0f114b855824/Python/pystate.c#l25

#ifdef WITH_THREAD
#include "pythread.h"
static PyThread_type_lock head_mutex = NULL; /* Protects interp->tstate_head */
#define HEAD_INIT() (void)(head_mutex || (head_mutex = PyThread_allocate_lock()))
#define HEAD_LOCK() PyThread_acquire_lock(head_mutex, WAIT_LOCK)
#define HEAD_UNLOCK() PyThread_release_lock(head_mutex)
 
#ifdef __cplusplus
extern "C" {
#endif

[pitrou]

I don't think you need anyone's permission to commit such a fix :)

[python-dev]

New changeset 5cc359804d61 by Benjamin Peterson in branch '3.2':
take linkage def outside of WITH_THREAD conditional (closes bpo-14569)
http://hg.python.org/cpython/rev/5cc359804d61

[python-dev]

New changeset 508ae5d27c2c by Benjamin Peterson in branch '2.7':
take linkage def outside of WITH_THREAD conditional (closes bpo-14569)
http://hg.python.org/cpython/rev/508ae5d27c2c

[jimjjewett]

On Fri, Apr 13, 2012 at 6:19 AM,
Antoine Pitrou <pitrou@free.fr> added the comment:

I don't think you need anyone's permission to commit such a fix :)

Well, *I* would, since I don't have commit privs, and don't currently
have a C dev environment with which to test.

But I figured testing the various build conditions might be good
documentation-of-ability for someone applying to GSoC or otherwise
trying to get started. (OK, the timing wouldn't be ideal, ...)

That said, I foresee adding build-multiple-ways to the regression
tests (as opposed to a buildbot), so I'll let the next applicant come
up with something else. :D