heap.c File Reference

#include "heap.h"
#include "../lib/types.h"
#include "../lib/err.h"

Include dependency graph for heap.c:

Go to the source code of this file.

Functions
void	__hinit (arena_t *arena, void *start, uint32_t size)
	initializes a central heap rather then child arena
void *	__alc (arena_t *arena, uint32_t size)
	allocates memory to a heap
void	__res (arena_t *arena)
	resets a arena or heap by setting current to start and overriding data
arena_t *	__anew (arena_t *parent, uint32_t size)
	creates a child arena under a central heap

Function Documentation

__alc()

void * __alc	(	arena_t *	arena,
		uint32_t	size )

allocates memory to a heap

alc is a function that allocates memory from a central heap

Parameters

arena,the	ptr to the arena to allocate from
size,the	amount to allocate

using alc is done with

#include "../mem/heap.h" //or just heap.h
void* myspace = alc(&myarena, 16); //allocate 16 bytes

See also

res(), anew()

Definition at line 51 of file heap.c.

References assert, arena_t::current, NULL, panic, arena_t::size, and arena_t::start.

__anew()

arena_t * __anew	(	arena_t *	parent,
		uint32_t	size )

creates a child arena under a central heap

anew is a function that makes a child arena under a parent heap

Parameters

parent,the	ptr to the parent arena
size,the	size of the arena

using anew is done with

#include "../mem/heap.h" //or just heap.h
#define MYARENA_SIZE (256 * 1024) //256kb child arena
arena_t *myarena
myarena = anew(&myheap, MYARENA_SIZE);

and you can reset this new arena or use it!

See also

res()

Definition at line 105 of file heap.c.

References alc, assert, hinit, and NULL.

__hinit()

void __hinit	(	arena_t *	arena,
		void *	start,
		uint32_t	size )

initializes a central heap rather then child arena

hinit is a function used to initliaze a new central heap, like kheap

Parameters

arena,in	hinit this is the ptr to your heap
start,this	should be a buffer like 'static uint8_t mem[HEAP_SIZE]' using the size of your heap
size,the	size of the heap using 'sizeof(mem)'

using hinit is done with

#include "../mem/heap.h" //or just heap.h
#define MYHEAP_SIZE (1024 * 1024) //the size of your heap, in this case 1mb, this is in bytes, so 1024 is 1kb, 1024 * 1024 is 1mb, and etc
arena_t myheap; //your heap
static uint8_t mymem[MYHEAP_SIZE] //that actual size
//now lets call hinit
hinit(&myheap, mymem, sizeof(mymem));

it initializes the heap by making the start and size be your set size but the current heap addr the start

See also

kheap, alc(), res(), anew(), arena_t

Definition at line 30 of file heap.c.

References arena_t::current, arena_t::size, and arena_t::start.

__res()

void __res

(

arena_t *

arena

)

resets a arena or heap by setting current to start and overriding data

Parameters

arena,the

arena or heap to reset

Definition at line 82 of file heap.c.

References arena_t::current, and arena_t::start.