MGM: use thread safe versions of common::LRU cache

Since these function calls are accessed by multiple threads with
only the namespace read lock, make sure cache access is safe
when EOS_MGM_LISTING_CACHE is set

Fixes: EOS-6535
Signed-off-by: Abhishek Lekshmanan <abhishek.lekshmanan@cern.ch>

Author: theanalyst

mgm/XrdMgmOfsDirectory.cc

@@ -45,7 +45,7 @@
 #endif
 
 
-eos::common::LRU::Cache<std::string, std::shared_ptr<XrdMgmOfsDirectory::listing_t>>
+eos::common::LRU::Cache<std::string, std::shared_ptr<XrdMgmOfsDirectory::listing_t>, std::mutex>
     XrdMgmOfsDirectory::dirCache(1024, 0);
 
 //------------------------------------------------------------------------------

mgm/XrdMgmOfsDirectory.hh

@@ -135,7 +135,7 @@ public:
 
   typedef std::set<std::string> listing_t;
 
-  static eos::common::LRU::Cache<std::string, std::shared_ptr<listing_t>>
+  static eos::common::LRU::Cache<std::string, std::shared_ptr<listing_t>,std::mutex>
       dirCache;
 
 private:

mgm/proc/user/Ls.cc

@@ -65,7 +65,7 @@ ProcCommand::Ls()
       return cacheentry;
     }
   };
-  static eos::common::LRU::Cache<std::string, struct result> dirCache;
+  static eos::common::LRU::Cache<std::string, struct result, std::mutex> dirCache;
   static bool use_cache = (getenv("EOS_MGM_LISTING_CACHE") &&
                            (dirCache.setMaxSize(atoi(getenv("EOS_MGM_LISTING_CACHE")))));
   std::ostringstream oss;