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Virtual_memory Class Reference

Virtual_memory is the allocator/deallocator for virtual memory. More...

#include <virtmem.h>

Collaboration diagram for Virtual_memory:

[legend]List of all members.

Public Methods
void	init ()
void *	alloc (unsigned int request_size)
void	free (void *data_address)
Public Attributes
void *	managed_mem_start
Protected Attributes
Chunk *	curr_free_chunk
Chunk *	free_list_head
Chunk *	free_list_tail

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Detailed Description

Virtual_memory is the allocator/deallocator for virtual memory.

Some ideas are borrowed from malloc_chunk in Doug Lea's malloc implementation, but significiant design differences are necessary due to the persistent nature of the virtual memory space. (You can't just go around accessing swapped-out pages left and right. Well, you can, but it'd be really slow.)

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Member Function Documentation

void * Virtual_memory::alloc (  unsigned int    request_size )

Allocate some virtual memory of the given size in bytes and return it.

void Virtual_memory::free (  void *    data_address )

Free some virtual memory previously allocated by alloc().

void Virtual_memory::init (    )

Initialize the free list of virtual memory.

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Member Data Documentation

Chunk* Virtual_memory::curr_free_chunk [protected]

current chunk of free list.

Chunk* Virtual_memory::free_list_head [protected]

points to first chunk in free list.

Chunk* Virtual_memory::free_list_tail [protected]

points to last chunk in free list.

void* Virtual_memory::managed_mem_start

start of managed memory chunks.

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The documentation for this class was generated from the following files:

• virtmem.h
• virtmem.cc

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Torsion Operating System, Copyright (C) 2000-2002 Dan Helfman