/* -*- C++ -*- */
// $Id$

// ============================================================================
//
// = LIBRARY
//    ace
//
// = FILENAME
//    Malloc.h
//
// = AUTHOR
//    Doug Schmidt and Irfan Pyarali
//
// ============================================================================

#ifndef ACE_MALLOC_H
#define ACE_MALLOC_H
#include "ace/pre.h"

#include "ace/ACE.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#include "ace/Malloc_Base.h"

#if (ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1)
#include "ace/Based_Pointer_T.h"
#endif /* ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1 */

#if defined (ACE_HAS_MALLOC_STATS)
#include "ace/Synch_T.h"
#if defined (ACE_HAS_THREADS)
#define ACE_PROCESS_MUTEX ACE_Process_Mutex
#else
#include "ace/SV_Semaphore_Simple.h"
#define ACE_PROCESS_MUTEX ACE_SV_Semaphore_Simple
#endif /* ACE_HAS_THREADS */

typedef ACE_Atomic_Op<ACE_PROCESS_MUTEX, int> ACE_INT;

/******************************************************************

* Assume that ACE_MALLOC_ALIGN is the number of bytes of the alignment
  of the platform. Usually, this will be 4 on most platforms.  Some
  platforms require this to be 8.  In any case, this macro should
  always be a 2's power.

* Malloc_Header structure.

  Notice that sizeof (ACE_Malloc_Header) must be multiple of
  ACE_MALLOC_ALIGN

   +-----------------------------------------+
   |MALLOC_HEADER_PTR *next_block_;          |
   |   // Points to next free Malloc_Header  |
   |   // in this chain.                     |
   +-----------------------------------------+
   |size_t size_;                            |
   |   // Size of buffer associate with      |
   |   // this Malloc_Header                 |
   }   // The size is in number of           |
   |   // Malloc_Header (including this one.)|
   +-----------------------------------------+
   |long paddings_[ACE_MALLOC_PADDING_SIZE]; |
   |   // Padding long array.  This purpose  |
   |   // of this padding array is to adjust |
   |   // the sizeof (Malloc_Header) to be   |
   |   // multiple of ACE_MALLOC_ALIGN.      |
   |   // If you are sure that               |
   |   //    sizeof (MALLOC_HEADER_PTR)      |
   |   //  + sizeof (size_t) is a multiple   |
   |   // of ACE_MALLOC_ALIGN, then you can  |
   |   // #define ACE_MALLOC_PADDING_SIZE 0  |
   |   // to complete remove this data member|
   |   // from Malloc_Header.  Otherwise,    |
   |   // ACE will try to figure out the     |
   |   // correct value of this macro.       |
   |   // However, the calculation does not  |
   |   // always do the right thing and in   |
   |   // some rare cases, you'll need to    |
   |   // tweak this value by defining the   |
   |   // macro (ACE_MALLOC_PADDING_SIZE)    |
   |   // explicitly.                        |
   +-----------------------------------------+

* Name_Node

  ACE_Malloc allows searching thru it's allocated buffer using names.
  Name_Node is an internal data structure that ACE_Malloc used to
  maintain a linked list that manages this (name, buffer) mappings.

   +-----------------------------------------+
   |char *name_;                             |
   |   // Points to a dynamically allocated  |
   |   // char buffer that holds the name    |
   |   // of this node.  This buffer is      |
   |   // allocated from using this          |
   |   // ACE_MALLOC instance that owns this |
   |   // Name_Node (so it always points to  |
   |   // a buffer owned by its Malloc.      |
   +-----------------------------------------+
   |char *pointer_;                          |
   |   // Points to the content that <name_> |
   |   // referring to.  Like <name_>, the   |
   |   // context always resides within the  |
   |   // Malloc.                            |
   +-----------------------------------------+
   |NAME_NODE_PTR next_;                     |
   +-----------------------------------------+
   |NAME_NODE_PTR prev_;                     |
   |   // Name Node linked list pointers.    |
   +-----------------------------------------+


* Control_Block

  Only the first ACE_Malloc instance that uses
  the shared memory will initialize the control block because all
  later instances are supposed to share the memory with the first
  instance.  The following diagram shows the initial value of a
  Control_Block.

   +-----------------------------------------+
   |NAME_NODE_PTR name_head_;                |<---- NULL
   |   // Entry point for double-linked list.|
   |   // Initialized to NULL pointer to     |
   |   // indicate an empty list.            |
   +-----------------------------------------+
   |MALLOC_HEADER_PTR freep_;                |
   |   // Pointer to last un-allocated       |
   |   // malloc_header linked list.         |---+
   +-----------------------------------------+   |
   |char lock_name_[MAXNAMELEN];             |   |
   |   // The global name of the lock.       |   |
   +-----------------------------------------+   |
   |Malloc_Stats malloc_stats_;              |   |
   |   // (Optional statistic information.   |   |
   |   //  Do not exist if                   |   |
   |   //  ACE_HAS_MALLOC_STATS is not       |   |
   |   //  defined.                          |   |
   +-----------------------------------------+   |
   |long align_[CONTROL_BLOCK_ALIGN_LONGS];  |   |
   |   //                                    |   |
   +-----------------------------------------+   |
   |Malloc_Header base_;                     |<--+
   |  // Dummy node used to anchor the       |
   |  // freelist.                           |<--+
   |                           +-------------+   |
   |                           |next_        |---+
   |                           +-------------+
   |                           |size_        |----> 0
   +-----------------------------------------+

  The first ACE_Malloc initializes the control block by allocating a
  memory block of size equal to or greater than sizeof (control block)
  (rounded to the closest <rounded_bytes>) and invokes the placement
  new's on to initialize the control block and its internal
  pointers/data structures.  If the extra memory (memory after the
  <base_> in the following diagram) is enough to create a
  Malloc_Header chain, one is created and added to the freelist list.
  That is, if the memory size returned by init_acquire() is greater
  than the sizeof Control_Block, the control block is initialized to
  the following diagram:


   +-------------------------------------
   |name_head_;                          |
   +-------------------------------------+
   |MALLOC_HEADER_PTR freep_;            |--+
   +-------------------------------------+  |
   |lock_name_[...];                     |  |
   +-------------------------------------+  |
   |malloc_stats_; (Optional)            |  |
   +-------------------------------------+  |
   |align_[...];                         |  |
   +-------------------------------------+  |
   |Malloc_Header base_;                 |<-+
   |                         +-----------+
   |                         |next_;     |--+
   |                         +-----------+  |
   |                         |size_ = 0; |  |
   +=====================================+  |
   |Malloc_Header base_;                 |<-+
   |                         +-----------+
   |                         |next_;     |
   |                         +-----------+
   |                         |size_ = 3; |
   +-------------------------------------+
   |Malloc_Header base_;                 |
   |                         +-----------+
   |   (Uninitialized)       |next_;     |
   |                         +-----------+
   |                         |size_;     |
   +-------------------------------------+
   |Malloc_Header base_;                 |
   |                         +-----------+
   |   (Uninitialized)       |next_;     |
   |                         +-----------+
   |                         |size_;     |
   +-------------------------------------+

***********************************************************/

struct ACE_Export ACE_Malloc_Stats
// TITLE
//    This keeps stats on the usage of the memory manager.
{
  ACE_Malloc_Stats (void);
  void dump (void) const;

  ACE_INT nchunks_;
  // Coarse-grained unit of allocation.

  ACE_INT nblocks_;
  // Fine-grained unit of allocation.

  ACE_INT ninuse_;
  // Number of blocks in use
};
#define ACE_MALLOC_STATS(X) X
#else
#define ACE_MALLOC_STATS(X)
#endif /* ACE_HAS_MALLOC_STATS */

#if !defined (ACE_MALLOC_PADDING)
// ACE_MALLOC_PADDING allows you to insure that allocated regions are
// at least <ACE_MALLOC_PADDING> bytes long.  It is especially useful
// when you want areas to be at least a page long, or 32K long, or
// something like that.  It doesn't guarantee alignment to an address
// multiple, like 8-byte data alignment, etc.  The allocated area's
// padding to your selected size is done with an added array of long[]
// and your compiler will decide how to align things in memory.

#define ACE_MALLOC_PADDING 1
#endif /* ACE_MALLOC_PADDING */

#if !defined (ACE_MALLOC_ALIGN)
// Align the malloc header size to a multiple of a double.
#define ACE_MALLOC_ALIGN (sizeof (double))
#endif /* ACE_MALLOC_ALIGN */

// ACE_MALLOC_HEADER_SIZE is the normalized malloc header size.
#define ACE_MALLOC_HEADER_SIZE (ACE_MALLOC_PADDING % ACE_MALLOC_ALIGN == 0 \
                                ? ACE_MALLOC_PADDING \
                                : (((ACE_MALLOC_PADDING / ACE_MALLOC_ALIGN) + 1) \
                                   * ACE_MALLOC_ALIGN))

class ACE_Export ACE_Control_Block
{
  // = TITLE
  //    This information is stored in memory allocated by the <Memory_Pool>.
  //
  // = DESCRIPTION
  //    This class defines the "old" control block class for use in
  //    ACE_Malloc_T.  This control block implementation is
  //    considerable more efficient than the "position independent"
  //    one below (ACE_PI_Control_Block) but if you are going to use
  //    it to construct a ACE_Malloc_T and access the memory from
  //    several different processes, you must "map" the underlying
  //    memory pool to the same address.
public:

  class ACE_Export ACE_Malloc_Header
  {
    // = TITLE
    //    This is the control block header.  It's used by <ACE_Malloc>
    //    to keep track of each chunk of data when it's in the free
    //    list or in use.
  public:
    ACE_Malloc_Header (void);

    ACE_Malloc_Header *next_block_;
    // Points to next block if on free list.

    static void init_ptr (ACE_Malloc_Header **ptr,
                          ACE_Malloc_Header *init,
                          void *base_addr);
    // Initialize a malloc header pointer.

    size_t size_;
    // Size of this header control block.

#if defined (ACE_MALLOC_PADDING_SIZE) && (ACE_MALLOC_PADDING_SIZE == 0)
    // No padding required.
#else
# if !defined (ACE_MALLOC_PADDING_SIZE)
#   define ACE_MALLOC_PADDING_SIZE ((int) (ACE_MALLOC_HEADER_SIZE - \
                                    (sizeof (ACE_Malloc_Header*) + sizeof (size_t)))\
                                    / (int) sizeof (long))
# endif /* !ACE_MALLOC_PADDING_SIZE */
    long padding_[ACE_MALLOC_PADDING_SIZE < 1 ? 1 : ACE_MALLOC_PADDING_SIZE];
#endif /* ACE_MALLOC_PADDING_SIZE && ACE_MALLOC_PADDING_SIZE == 0 */

    void dump (void) const;
    // Dump the state of the object.
  };

  class ACE_Export ACE_Name_Node
  {
    // = TITLE
    //    This class supports "named memory regions" within <ACE_Malloc>.
    //
    // = DESCRIPTION
    //   Internally, the named memory regions are stored as a
    //   doubly-linked list within the <Memory_Pool>.  This makes
    //   it easy to iterate over the items in the list in both FIFO
    //   and LIFO order.
  public:
    // = Initialization methods.
    ACE_Name_Node (const char *name,
                   char *name_ptr,
                   char *pointer,
                   ACE_Name_Node *head);
    // Constructor.

    ACE_Name_Node (const ACE_Name_Node &);
    // Copy constructor.

    ACE_Name_Node (void);
    // Constructor.

    ~ACE_Name_Node (void);
    // Constructor.

    static void init_ptr (ACE_Name_Node **ptr,
                          ACE_Name_Node *init,
                          void *base_addr);
    // Initialize a name node pointer.

    const char *name (void) const;
    // Return a pointer to the name of this node.

    void name (const char *);
    // Assign a name;

    char *name_;
    // Name of the Node.

    char *pointer_;
    // Pointer to the contents.

    ACE_Name_Node *next_;
    // Pointer to the next node in the doubly-linked list.

    ACE_Name_Node *prev_;
    // Pointer to the previous node in the doubly-linked list.

    void dump (void) const;
    // Dump the state of the object.
  };

  static void print_alignment_info (void);
  // Print out a bunch of size info for debugging.

  ACE_Name_Node *name_head_;
  // Head of the linked list of Name Nodes.

  ACE_Malloc_Header *freep_;
  // Current head of the freelist.

  char lock_name_[MAXNAMELEN];
  // Name of lock thats ensures mutual exclusion.

#if defined (ACE_HAS_MALLOC_STATS)
  // Keep statistics about ACE_Malloc state and performance.
  ACE_Malloc_Stats malloc_stats_;
#define ACE_CONTROL_BLOCK_SIZE ((int)(sizeof (ACE_Name_Node*) \
                                      + sizeof (ACE_Malloc_Header*) \
                                      + MAXNAMELEN  \
                                      + sizeof (ACE_Malloc_Stats)))
#else
#define ACE_CONTROL_BLOCK_SIZE ((int)(sizeof (ACE_Name_Node*) \
                                      + sizeof (ACE_Malloc_Header*) \
                                      + MAXNAMELEN))
#endif /* ACE_HAS_MALLOC_STATS */

// Notice the casting to int for <sizeof> otherwise unsigned int
// arithmetic is used and some awful things may happen.
#if defined (ACE_CONTROL_BLOCK_ALIGN_LONGS) && (ACE_CONTROL_BLOCK_ALIGN_LONGS == 0)
  // No padding required in control block.
#else
# if !defined (ACE_CONTROL_BLOCK_ALIGN_LONGS)
#   define ACE_CONTROL_BLOCK_ALIGN_LONGS \
            ((ACE_CONTROL_BLOCK_SIZE % ACE_MALLOC_ALIGN != 0 \
              ? ACE_MALLOC_ALIGN - (ACE_CONTROL_BLOCK_SIZE % ACE_MALLOC_ALIGN) \
              : ACE_MALLOC_ALIGN) / int (sizeof (long)))
# endif /* !ACE_CONTROL_BLOCK_ALIGN_LONGS */
  long align_[ACE_CONTROL_BLOCK_ALIGN_LONGS < 1 ? 1 : ACE_CONTROL_BLOCK_ALIGN_LONGS];
  // Force alignment.
#endif /* ACE_CONTROL_BLOCK_ALIGN_LONGS && ACE_CONTROL_BLOCK_ALIGN_LONGS == 0 */

  ACE_Malloc_Header base_;
  // Dummy node used to anchor the freelist.  This needs to come last...

  void dump (void) const;
  // Dump the state of the object.
};

#if (ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1)

// prepare for position independent malloc
class ACE_Export ACE_PI_Control_Block
{
  // = TITLE
  //    This information is stored in memory allocated by the <Memory_Pool>.
  //
  // = DESCRIPTION
  //    This class implements the control block structure that can be
  //    used in a "position indepent" fashion, i.e., you don't need to
  //    "map" the underlying memory pool to the same address in
  //    processes sharing the memory.  The tradoff of this flexibility
  //    is more expensive malloc/free operations.
public:
  class ACE_Malloc_Header;
  class ACE_Name_Node;

  typedef ACE_Based_Pointer<ACE_Malloc_Header> MALLOC_HEADER_PTR;
  typedef ACE_Based_Pointer<ACE_Name_Node> NAME_NODE_PTR;
  typedef ACE_Based_Pointer_Basic<char> CHAR_PTR;

  class ACE_Export ACE_Malloc_Header
  {
    // = TITLE
    //    This is the control block header.  It's used by <ACE_Malloc>
    //    to keep track of each chunk of data when it's in the free
    //    list or in use.
  public:
    ACE_Malloc_Header (void);

    MALLOC_HEADER_PTR next_block_;
    // Points to next block if on free list.

    static void init_ptr (MALLOC_HEADER_PTR *ptr,
                          ACE_Malloc_Header *init,
                          void *base_addr);
    // Initialize a malloc header pointer.

    size_t size_;
    // Size of this header control block.

#if defined (ACE_PI_MALLOC_PADDING_SIZE) && (ACE_PI_MALLOC_PADDING_SIZE == 0)
    // No padding required for PI_Malloc_Header.
#else
# if !defined (ACE_PI_MALLOC_PADDING_SIZE)
#   define ACE_PI_MALLOC_PADDING_SIZE ((int) (ACE_MALLOC_HEADER_SIZE - \
                                       (sizeof (MALLOC_HEADER_PTR) + sizeof (size_t)))\
                                       / (int) sizeof (long))
# endif /* !ACE_PI_MALLOC_PADDING_SIZE */
    long padding_[ACE_PI_MALLOC_PADDING_SIZE < 1 ? 1 : ACE_PI_MALLOC_PADDING_SIZE];
#endif /* ACE_PI_MALLOC_PADDING_SIZE && ACE_PI_MALLOC_PADDING_SIZE == 0 */

    void dump (void) const;
    // Dump the state of the object.

  private:
    ACE_UNIMPLEMENTED_FUNC (void operator= (const ACE_Malloc_Header &))
  };

  class ACE_Export ACE_Name_Node
  {
    // = TITLE
    //    This class supports "named memory regions" within <ACE_Malloc>.
    //
    // = DESCRIPTION
    //   Internally, the named memory regions are stored as a
    //   doubly-linked list within the <Memory_Pool>.  This makes
    //   it easy to iterate over the items in the list in both FIFO
    //   and LIFO order.
  public:
    // = Initialization methods.
    ACE_Name_Node (const char *name,
                   char *name_ptr,
                   char *pointer,
                   ACE_Name_Node *head);
    // Constructor.

    ACE_Name_Node (const ACE_Name_Node &);
    // Copy constructor.

    ACE_Name_Node (void);
    // Constructor.

    ~ACE_Name_Node (void);
    // Constructor.

    static void init_ptr (NAME_NODE_PTR *ptr,
                          ACE_Name_Node *init,
                          void *base_addr);
    // Initialize a name node pointer.

    const char *name (void) const;
    // Return a pointer to the name of this node.

    void name (const char *);
    // Assign a name;

    CHAR_PTR name_;
    // Name of the Node.

    CHAR_PTR pointer_;
    // Pointer to the contents.

    NAME_NODE_PTR next_;
    // Pointer to the next node in the doubly-linked list.

    NAME_NODE_PTR prev_;
    // Pointer to the previous node in the doubly-linked list.

    void dump (void) const;
    // Dump the state of the object.

  private:
    ACE_UNIMPLEMENTED_FUNC (void operator= (const ACE_Name_Node &))
  };

  static void print_alignment_info (void);
  // Print out a bunch of size info for debugging.

  NAME_NODE_PTR name_head_;
  // Head of the linked list of Name Nodes.

  MALLOC_HEADER_PTR freep_;
  // Current head of the freelist.

  char lock_name_[MAXNAMELEN];
  // Name of lock thats ensures mutual exclusion.

#if defined (ACE_HAS_MALLOC_STATS)
  // Keep statistics about ACE_Malloc state and performance.
  ACE_Malloc_Stats malloc_stats_;
#define ACE_PI_CONTROL_BLOCK_SIZE ((int)(sizeof (NAME_NODE_PTR) \
                                         + sizeof (MALLOC_HEADER_PTR) \
                                         + MAXNAMELEN  \
                                         + sizeof (ACE_Malloc_Stats)))
#else
#define ACE_PI_CONTROL_BLOCK_SIZE ((int)(sizeof (NAME_NODE_PTR) \
                                         + sizeof (MALLOC_HEADER_PTR) \
                                         + MAXNAMELEN))
#endif /* ACE_HAS_MALLOC_STATS */

#if defined (ACE_PI_CONTROL_BLOCK_ALIGN_LONGS) && (ACE_PI_CONTROL_BLOCK_ALIGN_LONGS == 0)
  // No padding required for PI_Control_Block.
#else
# if !defined (ACE_PI_CONTROL_BLOCK_ALIGN_LONGS)
// Notice the casting to int for <sizeof> otherwise unsigned int
// arithmetic is used and some awful things may happen.
#   define ACE_PI_CONTROL_BLOCK_ALIGN_LONGS \
            ((ACE_PI_CONTROL_BLOCK_SIZE % ACE_MALLOC_ALIGN != 0 \
              ? ACE_MALLOC_ALIGN - (ACE_PI_CONTROL_BLOCK_SIZE % ACE_MALLOC_ALIGN) \
              : ACE_MALLOC_ALIGN) / int (sizeof (long)))
# endif /* !ACE_PI_CONTROL_BLOCK_ALIGN_LONGS */
  long align_[ACE_PI_CONTROL_BLOCK_ALIGN_LONGS < 1 ? 1 : ACE_PI_CONTROL_BLOCK_ALIGN_LONGS];
  // Force alignment.
#endif /* ACE_PI_CONTROL_BLOCK_ALIGN_LONGS && ACE_PI_CONTROL_BLOCK_ALIGN_LONGS == 0 */

  ACE_Malloc_Header base_;
  // Dummy node used to anchor the freelist.  This needs to come last...

  void dump (void) const;
  // Dump the state of the object.

private:
  ACE_UNIMPLEMENTED_FUNC (void operator= (const ACE_Control_Block &))
};
#endif /* ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1 */

class ACE_Export ACE_New_Allocator : public ACE_Allocator
{
  // = TITLE
  //     Defines a class that provided a simple implementation of
  //     memory allocation.
  //
  // = DESCRIPTION
  //     This class uses the new/delete operators to allocate and free
  //     up memory.  Please note that the only methods that are
  //     supported are malloc and free. All other methods are no-ops.
  //     If you require this functionality, please use:
  //     ACE_Allocator_Adapter <ACE_Malloc <ACE_LOCAL_MEMORY_POOL,
  //     MUTEX> > This will allow you to use the added functionality
  //     of bind/find/etc. while using the new/delete operators.
public:
  virtual void *malloc (size_t nbytes);
  virtual void *calloc (size_t nbytes, char initial_value = '\0');
  virtual void free (void *ptr);
  virtual int remove (void);
  virtual int bind (const char *name, void *pointer, int duplicates = 0);
  virtual int trybind (const char *name, void *&pointer);
  virtual int find (const char *name, void *&pointer);
  virtual int find (const char *name);
  virtual int unbind (const char *name);
  virtual int unbind (const char *name, void *&pointer);
  virtual int sync (ssize_t len = -1, int flags = MS_SYNC);
  virtual int sync (void *addr, size_t len, int flags = MS_SYNC);
  virtual int protect (ssize_t len = -1, int prot = PROT_RDWR);
  virtual int protect (void *addr, size_t len, int prot = PROT_RDWR);
#if defined (ACE_HAS_MALLOC_STATS)
  virtual void print_stats (void) const;
#endif /* ACE_HAS_MALLOC_STATS */
  virtual void dump (void) const;

private:
  // DO NOT ADD ANY STATE (DATA MEMBERS) TO THIS CLASS!!!!  See the
  // <ACE_Allocator::instance> implementation for explanation.
};

class ACE_Export ACE_Static_Allocator_Base : public ACE_Allocator
{
  // = TITLE
  //     Defines a class that provided a highly optimized memory
  //     management scheme for allocating memory statically.
  //
  // = DESCRIPTION
  //     This class manages a fixed-size <POOL_SIZE> of memory.  Every
  //     time <malloc>/<calloc> is called, it simply moves an internal
  //     index forward and returns a pointer to the requested chunk.
  //     All memory is allocated statically (typically via the
  //     <ACE_Static_Allocator> template) and <free> is a no-op.  This
  //     behavior is useful for use-cases where all the memory
  //     allocation needs are known in advance and no deletions ever
  //     occur.
public:
  ACE_Static_Allocator_Base (char *buffer, size_t size);
  virtual void *malloc (size_t nbytes);
  virtual void *calloc (size_t nbytes, char initial_value = '\0');
  virtual void free (void *ptr);
  virtual int remove (void);
  virtual int bind (const char *name, void *pointer, int duplicates = 0);
  virtual int trybind (const char *name, void *&pointer);
  virtual int find (const char *name, void *&pointer);
  virtual int find (const char *name);
  virtual int unbind (const char *name);
  virtual int unbind (const char *name, void *&pointer);
  virtual int sync (ssize_t len = -1, int flags = MS_SYNC);
  virtual int sync (void *addr, size_t len, int flags = MS_SYNC);
  virtual int protect (ssize_t len = -1, int prot = PROT_RDWR);
  virtual int protect (void *addr, size_t len, int prot = PROT_RDWR);
#if defined (ACE_HAS_MALLOC_STATS)
  virtual void print_stats (void) const;
#endif /* ACE_HAS_MALLOC_STATS */
  virtual void dump (void) const;

protected:
  ACE_Static_Allocator_Base (void);
  // Don't allow direct instantiations of this class.

  char *buffer_;
  // Pointer to the buffer.

  size_t size_;
  // Size of the buffer.

  size_t offset_;
  // Pointer to the current offset in the <buffer_>.
};

#if defined (__ACE_INLINE__)
#include "ace/Malloc.i"
#endif /* __ACE_INLINE__ */

// Include the ACE_Malloc templates and ACE_Memory_Pool classes at this point.
#include "ace/Malloc_T.h"
#include "ace/Memory_Pool.h"

#include "ace/post.h"
#endif /* ACE_MALLOC_H */