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b3577833ef
tuxtxt_cache_lock does not prevent from calling tuxtxt_clear_cache
while the cache thread is in the middle of inserting pages, thus
leading to a hard-to-reproduce crash when trying to start up tuxtxt.
The simplest fix is to use an additional "big hammer" lock arond
the whole critical area. Since tuxtxt_clear_cache is only called
very seldom, there should be no lock contention problem.
Origin commit data
------------------
Commit: 9af56e1852
Author: Stefan Seyfried <seife@tuxbox-git.slipkontur.de>
Date: 2012-07-15 (Sun, 15 Jul 2012)