dmmlib/custom_free.c

#include <stdio.h>
#include "custom_free.h"
#include "other.h"
#include "posix_lock.h"
#include "block_header.h"

void custom_free(heap_t* heap, void *ptr) {
	size_t size;
	int fixed_list_id, i;
	maptable_node_t *current_maptable_node;

	size = get_size(ptr);
	fixed_list_id = map_size_to_list(heap, size);
	
	posix_lock(heap);

	if(fixed_list_id != -1) {
		current_maptable_node = heap->maptable_head;		
		if(fixed_list_id == 0) {
			set_next(ptr, current_maptable_node->fixed_list_head);
			current_maptable_node->fixed_list_head = ptr;
		} else {
			for(i = 1; i < fixed_list_id; i++) {
				current_maptable_node = current_maptable_node->next;
			}
			set_next(ptr, current_maptable_node->fixed_list_head);
			current_maptable_node->fixed_list_head = ptr;
		}
		printf("Block of size %d was free'd to a fixed list.\n", size);
	} else { // put it in the free list
		set_next(ptr, heap->free_list_head);
		heap->free_list_head = ptr;
		printf("Block of size %d was free'd to free list.\n", size);
	}

	posix_unlock(heap);
}