Multiprocessing and UUID bug on Mac OSX

[GavinRoy]

BPO	8756
Nosy	@ronaldoussoren
Superseder	bpo-8621: uuid.uuid4() generates non-unique values on OSX

^{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 = 'https://github.com/ronaldoussoren'
closed_at = <Date 2010-05-18.18:52:59.752>
created_at = <Date 2010-05-18.18:38:15.470>
labels = ['OS-mac']
title = 'Multiprocessing and UUID bug on Mac OSX'
updated_at = <Date 2010-05-18.18:52:59.751>
user = 'https://bugs.python.org/GavinRoy'

bugs.python.org fields:

activity = <Date 2010-05-18.18:52:59.751>
actor = 'r.david.murray'
assignee = 'ronaldoussoren'
closed = True
closed_date = <Date 2010-05-18.18:52:59.752>
closer = 'r.david.murray'
components = ['macOS']
creation = <Date 2010-05-18.18:38:15.470>
creator = 'Gavin.Roy'
dependencies = []
files = []
hgrepos = []
issue_num = 8756
keywords = []
message_count = 1.0
messages = ['105997']
nosy_count = 2.0
nosy_names = ['ronaldoussoren', 'Gavin.Roy']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '8621'
type = None
url = 'https://bugs.python.org/issue8756'
versions = ['Python 2.6']

[GavinRoy]

import multiprocessing
import uuid

def test():
    print str(uuid.uuid4())

p = multiprocessing.Pool(processes=4)
for x in xrange(0, 4):
  p.apply_async(test)

In MacOS:

Gavin-M-Roys-Office-iMac:kvpbench gmr$ python
Python 2.6.1 (r261:67515, Feb 11 2010, 00:51:29) 
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 
>>> 
>>> 
>>> import multiprocessing
>>> import uuid
>>> 
>>> def test():
...     print str(uuid.uuid4())
... 
>>> p = multiprocessing.Pool(processes=4)
>>> for x in xrange(0, 4):
...   p.apply_async(test)
... 
<multiprocessing.pool.ApplyResult object at 0x10056bb90>
<multiprocessing.pool.ApplyResult object at 0x10064e690>
<multiprocessing.pool.ApplyResult object at 0x10064e750>
<multiprocessing.pool.ApplyResult object at 0x10064e710>
>>> 62c76035-e340-41c4-86b4-908660b73bb7
62c76035-e340-41c4-86b4-908660b73bb7
62c76035-e340-41c4-86b4-908660b73bb7
62c76035-e340-41c4-86b4-908660b73bb7

In Linux:

gmr@binti ~ $ python
Python 2.6.4 (r264:75706, Mar  9 2010, 17:27:45) 
[GCC 4.1.2 (Gentoo 4.1.2 p1.0.2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import multiprocessing
>>> import uuid
>>> 
>>> def test():
...     print str(uuid.uuid4())
... 
>>> p = multiprocessing.Pool(processes=4)
>>> for x in xrange(0, 4):
...   p.apply_async(test)
... 
<multiprocessing.pool.ApplyResult object at 0x7dd990>
<multiprocessing.pool.ApplyResult object at 0x86d310>
<multiprocessing.pool.ApplyResult object at 0x86d390>
<multiprocessing.pool.ApplyResult object at 0x86d410>
>>> 6121782c-008d-42db-9df5-bbf619fb6568
ee7d3ef8-1c54-4ab5-bf06-1eddf5bcf2cb
40efe282-65a5-4160-96ee-b4cc0d14029d
9eb799f2-a46c-41e8-901f-423177f3467d