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Issue #9260: A finer-grained import lock.

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Most of the import sequence now uses per-module locks rather than the
global import lock, eliminating well-known issues with threads and imports.
This commit is contained in:
Antoine Pitrou 2012-05-17 18:55:59 +02:00
parent 5cec9d2ae5
commit ea3eb88bca
12 changed files with 3777 additions and 3041 deletions
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14
Doc/c-api/import.rst
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@ -30,13 +30,13 @@ Importing Modules
.. c:function:: PyObject* PyImport_ImportModuleNoBlock(const char *name)
This version of :c:func:`PyImport_ImportModule` does not block. It's intended
to be used in C functions that import other modules to execute a function.
The import may block if another thread holds the import lock. The function
:c:func:`PyImport_ImportModuleNoBlock` never blocks. It first tries to fetch
the module from sys.modules and falls back to :c:func:`PyImport_ImportModule`
unless the lock is held, in which case the function will raise an
:exc:`ImportError`.
This function is a deprecated alias of :c:func:`PyImport_ImportModule`.
.. versionchanged:: 3.3
This function used to fail immediately when the import lock was held
by another thread. In Python 3.3 though, the locking scheme switched
to per-module locks for most purposes, so this function's special
behaviour isn't needed anymore.
.. c:function:: PyObject* PyImport_ImportModuleEx(char *name, PyObject *globals, PyObject *locals, PyObject *fromlist)