[Fedora-directory-devel] Please review: make PAM passthru plugin thread safe

[Richard Megginson]

Since PAM is not thread safe, only 1 thread at a time may access the PAM 
API.  This fix adds a mutex around the critical section where we call 
all of the PAM functions.  I've also added another init function which 
is used to create the mutex.  This has been tested on RHEL4 under a 
moderate load and seems to work fine.
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