Revert "_ctypes: don't cache library, bug #448858"

This reverts commit 9e37cca4f54260bd8c45a3041fcee00938c71649.
As noted in bug #448858, comment #14, dlclose is not called
automatically, so we may as well cache our library handles.
In order to protect ourselves, we use a fork since commit
7ebb2f54877edb28621c33e380f8777b1b1dc201.

diff --git a/pym/portage/util/_ctypes.py b/pym/portage/util/_ctypes.py
index f419b1926544cf4e3daef9a55008e1f19dde06c8..4e5aa2a6b3ad4414b10c374325dbd2c7ed5663e5 100644 (file)
--- a/pym/portage/util/_ctypes.py
+++ b/pym/portage/util/_ctypes.py
@@ -31,15 +31,17 @@ def find_library(name):
                return None
        return filename
 
+_library_handles = {}
+
 def LoadLibrary(name):
        """
        Calls ctypes.cdll.LoadLibrary(name) if the ctypes module is available,
-       and otherwise returns None. Results are not cached, since that can
-       cause problems when libraries are updated (see bug #448858).
+       and otherwise returns None. Results are cached for future invocations.
        """
-       handle = None
+       handle = _library_handles.get(name)
 
-       if ctypes is not None:
+       if handle is None and ctypes is not None:
                handle = ctypes.cdll.LoadLibrary(name)
+               _library_handles[name] = handle
 
        return handle