pull up r20555 from trunk

 r20555@cathode-dark-space:  jaltman | 2008-07-21 15:43:21 -0400
 ticket: 5895
 tags: pullup
 
 There are two mutex locking issues that Roland Dowdeswell noticed in 
 the memory ccache.  The first one is in cc_memory.c:krb5_mcc_initialize(). 
 When it is free(3)ing the existing credentials it does not lock the 
 data structures and hence two separate threads can run into issues.
 
 The same problem exists in cc_memory.c:krb5_mcc_destroy().
 
 


Commit By: tlyu



Revision: 20562
Changed Files:
_U  branches/krb5-1-6/
U   branches/krb5-1-6/src/lib/krb5/ccache/cc_memory.c