* prof_int.h: Define USE_PTHREADS and include pthread.h if on MacOS X.

* prof_int.h: Define USE_PTHREADS and include pthread.h if on MacOS X.
(struct global_shared_profile_data) [USE_PTHREADS]: Add a mutex.
(g_shared_trees_mutex) [USE_PTHREADS]: New macro, references the global mutex.
(prof_mutex_lock, prof_mutex_unlock) [SHARE_TREE_DATA]: Define to use pthread
functions or do nothing.
(profile_free_file_data): Delete declaration.
(profile_dereference_data): Declare.
* prof_file.c (profile_free_file_data): Now static.
(profile_open_file, profile_dereference_data) [SHARE_TREE_DATA]: Grab lock
while manipulating global data list or its contents.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@15061 dc483132-0cff-0310-8789-dd5450dbe970