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// -*- C++ -*-
//==========================================================================
/**
* @file PI_Malloc.h
*
* $Id$
*
* @author Priyanka Gontla <pgontla@ece.uci.edu>
* @author Based on code that existed in other ACE files.
*/
//==========================================================================
#ifndef ACE_PI_MALLOC_H
#define ACE_PI_MALLOC_H
#include /**/ "ace/pre.h"
#include "ace/ACE_export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#if (ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1)
#include "ace/Malloc.h"
#include "ace/Based_Pointer_T.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
// prepare for position independent malloc
/**
* @class ACE_PI_Control_Block
*
* @brief This information is stored in memory allocated by the Memory_Pool.
*
* 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.
*/
class ACE_Export ACE_PI_Control_Block
{
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_Malloc_Header
*
* @brief 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.
*/
class ACE_Export ACE_Malloc_Header
{
public:
ACE_Malloc_Header (void);
/// Points to next block if on free list.
MALLOC_HEADER_PTR next_block_;
/// Initialize a malloc header pointer.
static void init_ptr (MALLOC_HEADER_PTR *ptr,
ACE_Malloc_Header *init,
void *base_addr);
/// Size of this header control block.
size_t size_;
# if !defined (ACE_PI_MALLOC_PADDING_SIZE)
# define ACE_PI_MALLOC_PADDING_SIZE ACE_MALLOC_ROUNDUP (ACE_MALLOC_HEADER_SIZE + sizeof (MALLOC_HEADER_PTR) + sizeof (size_t), ACE_MALLOC_ALIGN) - (sizeof (MALLOC_HEADER_PTR) + sizeof (size_t))
# endif /* !ACE_PI_MALLOC_PADDING_SIZE */
char padding_[(ACE_PI_MALLOC_PADDING_SIZE) ? ACE_PI_MALLOC_PADDING_SIZE : ACE_MALLOC_ALIGN];
/// Dump the state of the object.
void dump (void) const;
private:
// Disallow assignment.
void operator= (const ACE_Malloc_Header &);
};
/**
* @class ACE_Name_Node
*
* @brief This class supports "named memory regions" within ACE_Malloc.
*
* 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.
*/
class ACE_Export ACE_Name_Node
{
public:
// = Initialization methods.
/// Constructor.
ACE_Name_Node (const char *name,
char *name_ptr,
char *pointer,
ACE_Name_Node *head);
/// Copy constructor.
ACE_Name_Node (const ACE_Name_Node &);
/// Constructor.
ACE_Name_Node (void);
/// Constructor.
~ACE_Name_Node (void);
/// Initialize a name node pointer.
static void init_ptr (NAME_NODE_PTR *ptr,
ACE_Name_Node *init,
void *base_addr);
/// Return a pointer to the name of this node.
const char *name (void) const;
/// Assign a name;
void name (const char *);
/// Name of the Node.
CHAR_PTR name_;
/// Pointer to the contents.
CHAR_PTR pointer_;
/// Pointer to the next node in the doubly-linked list.
NAME_NODE_PTR next_;
/// Pointer to the previous node in the doubly-linked list.
NAME_NODE_PTR prev_;
/// Dump the state of the object.
void dump (void) const;
private:
// Disallow assignment.
void operator= (const ACE_Name_Node &);
};
/// Print out a bunch of size info for debugging.
static void print_alignment_info (void);
/// Reference counter.
int ref_counter_;
/// Head of the linked list of Name Nodes.
NAME_NODE_PTR name_head_;
/// Current head of the freelist.
MALLOC_HEADER_PTR freep_;
/// Name of lock thats ensures mutual exclusion.
char lock_name_[MAXNAMELEN];
#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) \
+ sizeof (int) \
+ MAXNAMELEN \
+ sizeof (ACE_Malloc_Stats)))
#else
#define ACE_PI_CONTROL_BLOCK_SIZE ((int)(sizeof (NAME_NODE_PTR) \
+ sizeof (MALLOC_HEADER_PTR) \
+ sizeof (int) \
+ MAXNAMELEN))
#endif /* ACE_HAS_MALLOC_STATS */
# if !defined (ACE_PI_CONTROL_BLOCK_ALIGN_BYTES)
# define ACE_PI_CONTROL_BLOCK_ALIGN_BYTES \
ACE_MALLOC_ROUNDUP (ACE_PI_CONTROL_BLOCK_SIZE, ACE_MALLOC_ALIGN) - ACE_PI_CONTROL_BLOCK_SIZE
# endif /* !ACE_PI_CONTROL_BLOCK_ALIGN_LONGS */
/// Force alignment.
char align_[(ACE_PI_CONTROL_BLOCK_ALIGN_BYTES) ? ACE_PI_CONTROL_BLOCK_ALIGN_BYTES : ACE_MALLOC_ALIGN];
/// Dummy node used to anchor the freelist. This needs to come last...
ACE_Malloc_Header base_;
/// Dump the state of the object.
void dump (void) const;
private:
// Disallow assignment.
void operator= (const ACE_Control_Block &);
};
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "ace/PI_Malloc.inl"
#endif /* __ACE_INLINE__ */
#endif /* ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1 */
#include /**/ "ace/post.h"
#endif /* ACE_PI_MALLOC_H */
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