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Add a mention of the new import locks in whatsnew.

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Antoine Pitrou 2012-05-17 21:13:45 +02:00
parent 62110c769f
commit 79341e7865
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Doc/whatsnew/3.3.rst
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@ -573,6 +573,23 @@ Some smaller changes made to the core Python language are:
.. XXX mention new error messages for passing wrong number of arguments to functions
A Finer-Grained Import Lock
===========================
Previous versions of CPython have always relied on a global import lock.
This led to unexpected annoyances, such as deadlocks when importing a module
would trigger code execution in a different thread as a side-effect.
Clumsy workarounds were sometimes employed, such as the
:c:func:`PyImport_ImportModuleNoBlock` C API function.
In Python 3.3, importing a module takes a per-module lock. This correctly
serializes importation of a given module from multiple threads (preventing
the exposure of incompletely initialized modules), while eliminating the
aforementioned annoyances.
(contributed by Antoine Pitrou in :issue:`9260`.)
New and Improved Modules
========================