Created on 2008-12-09 10:13 by mortenab, last changed 2009-01-10 20:55 by facundobatista. This issue is now closed.
| Messages (3) | |||
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| msg77401 - (view) | Author: Morten Bentsen (mortenab) | Date: 2008-12-09 10:13 | |
The uuid module uses a single global buffer for storing random values
obtained from the system. This can (and does) cause non-uniqueness of
generated id's when using the uuid4 function in a multithreaded program.
The following snippet shows the problem - _buffer is the global buffer:
# When the system provides a version-4 UUID generator, use it.
if _uuid_generate_random:
_uuid_generate_random(_buffer)
return UUID(bytes=_buffer.raw)
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| msg77402 - (view) | Author: STINNER Victor (haypo) *  |
Date: 2008-12-09 10:31 | |
It looks like the bug is already fixed in Python trunk:
def uuid4():
"""Generate a random UUID."""
# When the system provides a version-4 UUID generator, use it.
if _uuid_generate_random:
_buffer = ctypes.create_string_buffer(16)
_uuid_generate_random(_buffer)
return UUID(bytes=_buffer.raw)
...
Changeset: r67318. The changeset was not related to this issue, but
#4363 (Make uuid module functions usable without ctypes).
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| msg79574 - (view) | Author: Facundo Batista (facundobatista) * |
Date: 2009-01-10 20:55 | |
Yes, _buffer is not longer global. Thanks for the report! |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2009-01-10 20:55:11 | facundobatista | set | status: open -> closed resolution: out of date messages: + msg79574 nosy: + facundobatista |
| 2008-12-09 10:32:00 | haypo | set | nosy:
+ haypo messages: + msg77402 |
| 2008-12-09 10:13:32 | mortenab | create | |