134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/* ************************************************************************** */
|
|
/* */
|
|
/* ::: :::::::: */
|
|
/* free.c :+: :+: :+: */
|
|
/* +:+ +:+ +:+ */
|
|
/* By: tomoron <tomoron@student.42angouleme.fr> +#+ +:+ +#+ */
|
|
/* +#+#+#+#+#+ +#+ */
|
|
/* Created: 2024/11/30 18:46:07 by tomoron #+# #+# */
|
|
/* Updated: 2024/12/09 19:16:14 by tomoron ### ########.fr */
|
|
/* */
|
|
/* ************************************************************************** */
|
|
|
|
#include "includes/malloc.h"
|
|
|
|
void invalid_pointer(char *fnc);
|
|
|
|
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)
|
|
return (first);
|
|
first = first->next;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int get_prev_alloc(t_alloc **alloc, t_alloc **res, t_alloc *cur, char *fnc)
|
|
{
|
|
t_alloc *prev;
|
|
|
|
*res = 0;
|
|
if (cur == *alloc)
|
|
return (1);
|
|
prev = 0;
|
|
while (cur)
|
|
{
|
|
if (cur->next == *alloc)
|
|
{
|
|
*res = cur;
|
|
return (1);
|
|
}
|
|
if ((cur->next > *alloc || cur->next == 0) && cur <= *alloc && \
|
|
((t_ul)(*alloc) - (t_ul)cur) <= cur->size)
|
|
{
|
|
log_str("invalid pointer but adress is inside of an \
|
|
allocation", 2, 1, 1);
|
|
*alloc = cur;
|
|
*res = prev;
|
|
return (1);
|
|
}
|
|
prev = cur;
|
|
cur = cur->next;
|
|
}
|
|
log_str("invalid pointer inside of a chunk", 2, 1, 1);
|
|
invalid_pointer(fnc);
|
|
return (0);
|
|
}
|
|
|
|
static int free_prealloc(t_alloc *alloc, t_mem_chunk **main_chunk, \
|
|
int is_small)
|
|
{
|
|
t_mem_chunk *chunk;
|
|
t_alloc *prev;
|
|
size_t size;
|
|
|
|
chunk = get_alloc_chunk(alloc, *main_chunk, is_small);
|
|
if (!chunk)
|
|
return (0);
|
|
log_str("free pointer chunk found", 3 ,1 ,1);
|
|
if (!get_prev_alloc(&alloc, &prev, chunk->first, "free"))
|
|
return (1);
|
|
chunk->space_left -= alloc->size + sizeof(t_alloc);
|
|
if (chunk->first == alloc)
|
|
chunk->first = alloc->next;
|
|
else if (prev)
|
|
prev->next = alloc->next;
|
|
if (!chunk->first)
|
|
{
|
|
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);
|
|
}
|
|
|
|
static void free_large(t_alloc *alloc)
|
|
{
|
|
t_alloc *prev;
|
|
|
|
if (!get_prev_alloc(&alloc, &prev, g_allocs.large, "free"))
|
|
{
|
|
log_str("unknown pointer given", 1, 1, 1);
|
|
return ;
|
|
}
|
|
if (alloc == g_allocs.large)
|
|
g_allocs.large = alloc->next;
|
|
else if (prev)
|
|
prev->next = alloc->next;
|
|
log_str("munmap called with size ", 3, 1, 0);
|
|
log_ul(alloc->size + sizeof(t_alloc), 3, 0, 1);
|
|
munmap(alloc, alloc->size + sizeof(t_alloc));
|
|
log_str("free sucessfull", 3, 1, 1);
|
|
}
|
|
|
|
void free(void *ptr)
|
|
{
|
|
t_alloc *alloc;
|
|
|
|
log_str("free function called", 3, 1, 1);
|
|
if (!ptr)
|
|
return ;
|
|
alloc = (t_alloc *)ptr - 1;
|
|
pthread_mutex_lock(&g_mallock);
|
|
if (free_prealloc(alloc, &g_allocs.tiny, 0))
|
|
log_str("free successful", 3, 1, 1);
|
|
else if (free_prealloc(alloc, &g_allocs.small, 1))
|
|
log_str("free successful", 3, 1, 1);
|
|
else
|
|
free_large(alloc);
|
|
pthread_mutex_unlock(&g_mallock);
|
|
}
|