TAO/tao/MMAP_Allocator.h

   1 // -*- C++ -*-
   2
   3 //=============================================================================
   4 /**
   5  *  @file    MMAP_Allocator.h
   6  *
   7  *  @author Ossama Othman <ossama@dre.vanderbilt.edu>
   8  */
   9 //=============================================================================
  10
  11 #ifndef TAO_MMAP_ALLOCATOR_H
  12 #define TAO_MMAP_ALLOCATOR_H
  13
  14 #include /**/ "ace/pre.h"
  15
  16 #include "tao/orbconf.h"
  17
  18 #if !defined (ACE_LACKS_PRAGMA_ONCE)
  19 # pragma once
  20 #endif /* ACE_LACKS_PRAGMA_ONCE */
  21
  22 #if TAO_HAS_SENDFILE == 1
  23
  24 #include "ace/Malloc_T.h"
  25 #include "ace/MMAP_Memory_Pool.h"
  26 #include "ace/Thread_Mutex.h"
  27
  28
  29 TAO_BEGIN_VERSIONED_NAMESPACE_DECL
  30
  31 // An ACE_Lite_MMAP_Memory_Pool is used since sync()ing is not
  32 // needed.  All memory allocated by the TAO_MMAP_Allocator is meant
  33 // for strictly transient data, not persistent.
  34 typedef ACE_Allocator_Adapter <ACE_Malloc<ACE_LITE_MMAP_MEMORY_POOL, TAO_SYNCH_MUTEX> > TAO_MMAP_Allocator_Base;
  35
  36 /**
  37  * @class TAO_MMAP_Allocator
  38  *
  39  * @brief mmap-based allocator.
  40  *
  41  * This class utilizes and
  42  */
  43 class TAO_MMAP_Allocator
  44   : public TAO_MMAP_Allocator_Base
  45 {
  46 public:
  47   /// Constructor
  48   TAO_MMAP_Allocator ();
  49
  50   /// Destructor.
  51   virtual ~TAO_MMAP_Allocator ();
  52
  53   /// Return backing store handle.
  54   ACE_HANDLE handle ();
  55
  56   /// Return offset in backing store file for memory address @a p. If @a p
  57   /// is not coming from this allocator -1 is returned.
  58   off_t offset (void * p);
  59
  60 private:
  61   TAO_MMAP_Allocator (TAO_MMAP_Allocator const &) = delete;
  62   void operator= (TAO_MMAP_Allocator const &) = delete;
  63   TAO_MMAP_Allocator (TAO_MMAP_Allocator &&) = delete;
  64   void operator= (TAO_MMAP_Allocator &&) = delete;
  65 };
  66
  67 TAO_END_VERSIONED_NAMESPACE_DECL
  68
  69 #endif  /* TAO_HAS_SENDFILE==1 */
  70
  71 #include /**/ "ace/post.h"
  72
  73 #endif  /* TAO_MMAP_ALLOCATOR_H */