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 // Created on: 2011-10-05
 // Created by: Kirill GAVRILOV
 // Copyright (c) 2013-2014 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef OSD_MemInfo_HeaderFile
 #define OSD_MemInfo_HeaderFile
 
 #include <TCollection_AsciiString.hxx>
 
 //! This class provide information about memory utilized by current process.
 //! This information includes:
 //!  - Private Memory - synthetic value that tries to filter out the memory
 //!                     usage only by the process itself (allocated for data
 //!                     and stack), excluding dynamic libraries.
 //!                     These pages may be in RAM or in SWAP.
 //!  - Virtual Memory - amount of reserved and committed memory in the
 //!                     user-mode portion of the virtual address space.
 //!                     Notice that this counter includes reserved memory
 //!                     (not yet in used) and shared between processes memory (libraries).
 //!  - Working Set    - set of memory pages in the virtual address space of the process
 //!                     that are currently resident in physical memory (RAM).
 //!                     These pages are available for an application to use
 //!                     without triggering a page fault.
 //!  - Pagefile Usage - space allocated for the pagefile, in bytes.
 //!                     Those pages may or may not be in memory (RAM)
 //!                     thus this counter couldn't be used to estimate
 //!                     how many active pages doesn't present in RAM.
 //!
 //! Notice that none of these counters can be used as absolute measure of
 //! application memory consumption!
 //!
 //! User should analyze all values in specific case to make correct decision
 //! about memory (over)usage. This is also prefferred to use specialized
 //! tools to detect memory leaks.
 //!
 //! This also means that these values should not be used for intellectual
 //! memory management by application itself.
 class OSD_MemInfo
 {
 
 public:
 
   enum Counter
   {
     MemPrivate = 0,    //!< Virtual memory allocated for data and stack excluding libraries
     MemVirtual,        //!< Reserved and committed memory of the virtual address space
     MemWorkingSet,     //!< Memory pages that are currently resident in physical memory
     MemWorkingSetPeak, //!< Peak working set size
     MemSwapUsage,      //!< Space allocated for the pagefile
     MemSwapUsagePeak,  //!< Peak space allocated for the pagefile
     MemHeapUsage,      //!< Total space allocated from the heap
     MemCounter_NB      //!< Indicates total counters number
   };
 
 public:
 
   //! Create and initialize. By default all countes are active
   Standard_EXPORT OSD_MemInfo (const Standard_Boolean theImmediateUpdate = Standard_True);
 
   //! Return true if the counter is active
   Standard_Boolean IsActive (const OSD_MemInfo::Counter theCounter) const { return myActiveCounters[theCounter]; }
 
   //! Set all counters active. The information is collected for active counters.
   //! @param theActive state for counters
   Standard_EXPORT void SetActive (const Standard_Boolean theActive);
 
   //! Set the counter active. The information is collected for active counters.
   //! @param theCounter type of counter
   //! @param theActive state for the counter
   void SetActive (const OSD_MemInfo::Counter theCounter, const Standard_Boolean theActive) { myActiveCounters[theCounter] = theActive; }
 
   //! Clear counters
   Standard_EXPORT void Clear();
 
   //! Update counters
   Standard_EXPORT void Update();
 
   //! Return the string representation for all available counter.
   Standard_EXPORT TCollection_AsciiString ToString() const;
 
   //! Return value of specified counter in bytes.
   //! Notice that NOT all counters are available on various systems.
   //! Standard_Size(-1) means invalid (unavailable) value.
   Standard_EXPORT Standard_Size Value (const OSD_MemInfo::Counter theCounter) const;
 
   //! Return value of specified counter in MiB.
   //! Notice that NOT all counters are available on various systems.
   //! Standard_Size(-1) means invalid (unavailable) value.
   Standard_EXPORT Standard_Size ValueMiB (const OSD_MemInfo::Counter theCounter) const;
 
   //! Return floating value of specified counter in MiB.
   //! Notice that NOT all counters are available on various systems.
   //! Standard_Real(-1) means invalid (unavailable) value.
   Standard_EXPORT Standard_Real ValuePreciseMiB (const OSD_MemInfo::Counter theCounter) const;
 
 public:
 
   //! Return the string representation for all available counter.
   Standard_EXPORT static TCollection_AsciiString PrintInfo();
 
 protected:
 
   //! Return true if the counter is active and the value is valid
   Standard_Boolean hasValue (const OSD_MemInfo::Counter theCounter) const
   { return IsActive (theCounter) && myCounters[theCounter] != Standard_Size(-1); }
 
 private:
 
   Standard_Size myCounters[MemCounter_NB]; //!< Counters' values, in bytes
   Standard_Boolean myActiveCounters[MemCounter_NB]; //!< container of active state for a counter
 
 };
 
 #endif // _OSD_MemInfo_H__

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