tom/ft_malloc
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add realloc, rename bloc to chunk, start thinking of chunk sizes

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tomoron
2024-12-02 20:18:59 +01:00
parent a15705401e
commit 231b283e0d
5 changed files with 163 additions and 70 deletions
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50
srcs/free.c
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@ -6,14 +6,20 @@
/* By: tomoron <tomoron@student.42angouleme.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2024/11/30 18:46:07 by tomoron #+# #+# */
/* Updated: 2024/12/01 18:47:12 by tomoron ### ########.fr */
/* Updated: 2024/12/02 19:54:00 by tomoron ### ########.fr */
/* */
/* ************************************************************************** */
#include "includes/malloc.h"
t_mem_bloc *get_alloc_bloc(t_alloc *alloc, t_mem_bloc *first, size_t size)
t_mem_chunk *get_alloc_chunk(t_alloc *alloc, t_mem_chunk *first,int is_small)
{
size_t size;
if(is_small)
size = SMALL_CHUNK_SIZE;
else
size = TINY_CHUNK_SIZE;
while(first)
{
if((t_ul)alloc >= (t_ul)first && ((t_ul)alloc - (t_ul)(first + 1)) <= size)
@ -27,6 +33,7 @@ int get_prev_alloc(t_alloc **alloc, t_alloc **res, t_alloc *cur)
{
t_alloc *prev;
*res = 0;
if(cur == *alloc)
return(1);
prev = 0;
@ -49,27 +56,32 @@ int get_prev_alloc(t_alloc **alloc, t_alloc **res, t_alloc *cur)
return(0);
}
int free_prealloc(t_alloc *alloc, t_mem_bloc **main_bloc, size_t size)
int free_prealloc(t_alloc *alloc, t_mem_chunk **main_chunk, int is_small)
{
t_mem_bloc *bloc;
t_mem_chunk *chunk;
t_alloc *prev;
size_t size;
prev = 0;
bloc = get_alloc_bloc(alloc, *main_bloc, size);
if(!bloc)
chunk = get_alloc_chunk(alloc, *main_chunk, is_small);
if(!chunk)
return(0);
if(!get_prev_alloc(&alloc, &prev, bloc->first))
if(!get_prev_alloc(&alloc, &prev, chunk->first))
return(1);
bloc->space_left -= alloc->size + sizeof(t_alloc);
if(bloc->first == alloc)
bloc->first = alloc->next;
chunk->space_left -= alloc->size + sizeof(t_alloc);
if(chunk->first == alloc)
chunk->first = alloc->next;
else if(prev)
prev->next = alloc->next;
if(!bloc->first)
if(!chunk->first)
{
if(*main_bloc == bloc)
*main_bloc = bloc->next;
munmap(bloc, size);
if(*main_chunk == chunk)
*main_chunk = chunk->next;
if(is_small)
size = SMALL_CHUNK_SIZE;
else
size = TINY_CHUNK_SIZE;
munmap(chunk, size);
}
return(1);
}
@ -87,14 +99,16 @@ void free_large(t_alloc *alloc)
munmap(alloc, alloc->size + sizeof(t_alloc));
}
void ft_free(void *ptr)
void free(void *ptr)
{
t_alloc *alloc;
alloc = (t_alloc *)ptr - 1;
if(free_prealloc(alloc, &g_allocs.tiny, TINY_BLOC_SIZE))
if(!ptr)
return ;
if(free_prealloc(alloc, &g_allocs.small, SMALL_BLOC_SIZE))
alloc = (t_alloc *)ptr - 1;
if(free_prealloc(alloc, &g_allocs.tiny, 0))
return ;
if(free_prealloc(alloc, &g_allocs.small, 1))
return ;
free_large(alloc);
}