CArena Class Reference

A Concrete Class for Dynamic Memory Management. More...

#include <Arena.H>

Inheritance diagram for CArena:

[legend]Collaboration diagram for CArena:

[legend]List of all members.


Public Types
enum	{ DefaultHunkSize = 1024*1024 }
	The default memory hunk size to grab from the heap. More...
Public Member Functions
	CArena (size_t a_hunk_size=0)
virtual	~CArena ()
	The destructor.
virtual void *	alloc (size_t a_nbytes)
	Allocate some memory.
virtual void	free (void *a_vp)
void *	calloc (size_t a_nmemb, size_t a_size)
void *	realloc (void *a_ptr, size_t a_size)
Protected Types
typedef set< Node >	NL
Protected Attributes
std::vector< void * >	m_alloc
NL	m_freelist
NL	m_busylist
size_t	m_hunk
Classes
class	Node

Detailed Description

A Concrete Class for Dynamic Memory Management.

This is a coalescing memory manager. It allocates (possibly) large chunks of heap space and apportions it out as requested. It merges together neighboring chunks on each free().

Member Typedef Documentation

typedef set< Node > CArena::NL [protected]

Member Enumeration Documentation

anonymous enum

The default memory hunk size to grab from the heap.

Enumeration values:

DefaultHunkSize

Constructor & Destructor Documentation

CArena::CArena ( size_t a_hunk_size = 0 )

: Construct a coalescing memory manager. `a_hunk_size' is the minimum size of hunks of memory to allocate from the heap. If a_hunk_size == 0 we use DefaultHunkSize as specified below.

virtual CArena::~CArena ( ) [virtual]

The destructor.

Member Function Documentation

virtual void* CArena::alloc ( size_t a_nbytes ) [virtual]

Allocate some memory.

Implements Arena.

void* CArena::calloc ( size_t a_nmemb,

size_t a_size

)

Mirror the C calloc() function. Returns zero'd memory of size a_nmemb*a_size. This is here so that we can implement malloc(3) and family. User's shouldn't use this function.

virtual void CArena::free ( void * a_vp ) [virtual]

Free up allocated memory. Merge neighboring free memory chunks into largest possible chunk.
Implements Arena.

void* CArena::realloc ( void * a_ptr,

size_t a_size

)

Mirror the C realloc() function. This is here so that we can implement malloc(3) and family. User's shouldn't use this function.