[Xcache] Provide monitoring summary statistics.

src/XrdPosix/XrdPosixStats.hh

@@ -0,0 +1,73 @@
+#ifndef __XRDPOSIXSTATS_HH__
+#define __XRDPOSIXSTATS_HH__
+/******************************************************************************/
+/*                                                                            */
+/*                      X r d P o s i x S t a t s . h h                       */
+/*                                                                            */
+/* (c) 2019 by the Board of Trustees of the Leland Stanford, Jr., University  */
+/*                            All Rights Reserved                             */
+/*   Produced by Andrew Hanushevsky for Stanford University under contract    */
+/*              DE-AC02-76-SFO0515 with the Department of Energy              */
+/*                                                                            */
+/* This file is part of the XRootD software suite.                            */
+/*                                                                            */
+/* XRootD is free software: you can redistribute it and/or modify it under    */
+/* the terms of the GNU Lesser General Public License as published by the     */
+/* Free Software Foundation, either version 3 of the License, or (at your     */
+/* option) any later version.                                                 */
+/*                                                                            */
+/* XRootD is distributed in the hope that it will be useful, but WITHOUT      */
+/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or      */
+/* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public       */
+/* License for more details.                                                  */
+/*                                                                            */
+/* You should have received a copy of the GNU Lesser General Public License   */
+/* along with XRootD in a file called COPYING.LESSER (LGPL license) and file  */
+/* COPYING (GPL license).  If not, see <http://www.gnu.org/licenses/>.        */
+/*                                                                            */
+/* The copyright holder's institutional names and contributor's names may not */
+/* be used to endorse or promote products derived from this software without  */
+/* specific prior written permission of the institution or contributor.       */
+/******************************************************************************/
+
+#include <string.h>
+
+#include "XrdSys/XrdSysAtomics.hh"
+#include "XrdSys/XrdSysPthread.hh"
+
+class XrdPosixStats
+{
+public:
+
+struct PosixStats
+{
+long long Opens;
+long long OpenErrs;
+long long Closes;
+long long CloseErrs;
+}         X;
+
+inline void Get(XrdPosixStats &D)
+               {sMutex.Lock();
+                memcpy(&D.X, &X, sizeof(PosixStats));
+                sMutex.UnLock();
+               }
+
+inline void  Add(long long &Dest, long long Val)
+                {sMutex.Lock(); Dest += Val; sMutex.UnLock();}
+
+inline void  Count(long long &Dest)
+                  {AtomicBeg(sMutex); AtomicInc(Dest); AtomicEnd(sMutex);}
+
+inline void  Set(long long &Dest, long long Val)
+                {sMutex.Lock(); Dest  = Val; sMutex.UnLock();}
+
+inline void  Lock()   {sMutex.Lock();}
+inline void  UnLock() {sMutex.UnLock();}
+
+             XrdPosixStats() {memset(&X, 0, sizeof(PosixStats));}
+            ~XrdPosixStats() {}
+private:
+XrdSysMutex sMutex;
+};
+#endif