add locking around auth info in zhandle_t
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Key: ZOOKEEPER-319
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-319
Project: Zookeeper
Issue Type: Bug
Components: c client
Affects Versions: 3.1.0, 3.0.1, 3.0.0
Reporter: Chris Darroch
Fix For: 3.1.1, 3.2.0
Looking over the zookeeper.c code it appears to me that the zoo_add_auth()
function may be called at any time by the user in their "main" thread. This
function alters the elements of the auth_info structure in the zhandle_t
structure.
Meanwhile, the IO thread may read those elements at any time in such functions
as send_auth_info() and auth_completion_func(). It seems important, then, to
add a lock which prevents data being read by the IO thread while only partially
changed by the user's thread. The attached patch add such a lock.
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