Updated free list interface

I realized my existing interface wouldn't work
if the coalescing or adding of a new node replaced
the head of the list, as there was no way to
communicate that back to the caller. As a result,
I've updated those interfaces to accept a pointer
to the free list head pointer. This will let them
change the free list head in alloc.c if necessary.

1 files changed, 9 insertions, 2 deletions

diff --git a/include/free_list.h b/include/free_list.h
index 887167b..1993aa7 100644
--- a/include/free_list.h
+++ b/include/free_list.h
@@ -15,6 +15,7 @@
 #include <stdlib.h>
 
 #include "constants.h"
+#include "alloc_header.h"
 
 typedef struct free_nd {
   size_t size;
@@ -34,9 +35,12 @@ free_nd *fl_find_first_fit(free_nd *free_list, size_t size);
  * specified node cannot be split (e.g., it's an exact match for size
  * within alignment restrictions), simply remove it from the list.
  *
+ * If the head of the free list is updated by this operation, the free
+ * list pointer passed as an argument will be updated to reflect this
+ *
  * Returns a pointer to the region of memory removed from the list.
  */
-void *fl_split_node(free_nd *free_list, free_nd *nd, size_t size);
+void *fl_split_node(free_nd **free_list, free_nd *nd, size_t size);
 
 /*
  * Scans the free list for adjacent nodes and merges them together
@@ -46,7 +50,10 @@ void fl_coalesce_nodes(free_nd *free_list);
 /*
  * Scans the free list for the correct location for the specified
  * pointer, and link it into the list at that point.
+ *
+ * If the head of the free list is updated by this operation, the free
+ * list pointer passed as an argument will be updated to reflect this
  */
-void fl_add_node(free_nd *free_list, void *ptr);
+void fl_add_node(free_nd **free_list, void *ptr);
 
 #endif