Managed memory allocator
[Memory functions]

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Detailed Description

The managed memory allocator is a fragmentation-free memory manager.

It keeps the allocated memory free from fragmentation by compacting the memory when blocks are freed. A program that uses the managed memory module cannot be sure that allocated memory stays in place. Therefore, a level of indirection is used: access to allocated memory must always be done using a special macro.

Note:

This module has not been heavily tested.

Files
file	mmem.h
	Header file for the managed memory allocator.
file	mmem.c
	Implementation of the managed memory allocator.
Data Structures
struct	mmem
Defines
#define	MMEM_PTR(m)
	Get a pointer to the managed memory.
#define	MMEM_SIZE   4096
Functions
int	mmem_alloc (struct mmem *m, unsigned int size)
	Allocate a managed memory block.
void	mmem_free (struct mmem *m)
	Deallocate a managed memory block.
void	mmem_init (void)
	Initialize the managed memory module.
Variables
unsigned int	avail_memory

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Define Documentation

#define MMEM_PTR (  m   )

Get a pointer to the managed memory. Parameters: m  A pointer to the struct mmem Returns: A pointer to the memory block, or NULL if memory could not be allcated. Author: Adam Dunkels This macro is used to get a pointer to a memory block allocated with mmem_alloc(). Definition at line 76 of file mmem.h.

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Function Documentation

int mmem_alloc (  struct mmem *  m, unsigned int  size )

Allocate a managed memory block. Parameters: m  A pointer to a struct mmem. size  The size of the requested memory block Returns: Non-zero if the memory could be allocated, zero if memory was not available. Author: Adam Dunkels This function allocates a chunk of managed memory. The memory allocated with this function must be deallocated using the mmem_free() function. Note: This function does NOT return a pointer to the allocated memory, but a pointer to a structure that contains information about the managed memory. The macro MMEM_PTR() is used to get a pointer to the allocated memory. Definition at line 80 of file mmem.c. References avail_memory, list_add(), MMEM_SIZE, ptr, and size.

void mmem_free (  struct mmem *  m  )

Deallocate a managed memory block. Parameters: m  A pointer to the managed memory block Author: Adam Dunkels This function deallocates a managed memory block that previously has been allocated with mmem_alloc(). Definition at line 116 of file mmem.c. References avail_memory, list_remove(), MMEM_SIZE, next, NULL, ptr, and size.

void mmem_init (  void   )

Initialize the managed memory module. Author: Adam Dunkels This function initializes the managed memory module and should be called before any other function from the module. Definition at line 149 of file mmem.c. References avail_memory, list_init(), and MMEM_SIZE.

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