/*
- * LICENSING: this file is copied from the Linux kernel. We should therefore
- * assume a GPLv2 license for the code that comes from the Linux mainline.
- */
-
-/*
- * Static-sized priority heap containing pointers. Based on CLR, chapter 7.
+ * prio_heap.c
+ *
+ * Static-sized priority heap containing pointers. Based on CLRS,
+ * chapter 6.
+ *
+ * Copyright 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
*/
#include <linux/slab.h>
#include <linux/prio_heap.h>
-int heap_init(struct ptr_heap *heap, size_t size, gfp_t gfp_mask,
- int (*gt)(void *, void *))
-{
- heap->ptrs = kmalloc(size, gfp_mask);
- if (!heap->ptrs)
- return -ENOMEM;
- heap->size = 0;
- heap->max = size / sizeof(void *);
- heap->gt = gt;
- return 0;
-}
-
-void heap_free(struct ptr_heap *heap)
-{
- kfree(heap->ptrs);
-}
+/*
+ * TODO implement heap_init, heap_free, heap_insert.
+ */
static void heapify(struct ptr_heap *heap, int pos)
{
return res;
}
-void *heap_insert(struct ptr_heap *heap, void *p)
-{
- void **ptrs = heap->ptrs;
- int pos;
-
- if (heap->size < heap->max) {
- /* Heap insertion */
- pos = heap->size++;
- while (pos > 0 && heap->gt(p, ptrs[(pos-1)/2])) {
- ptrs[pos] = ptrs[(pos-1)/2];
- pos = (pos-1)/2;
- }
- ptrs[pos] = p;
- return NULL;
- }
-
- /* The heap is full, so something will have to be dropped */
-
- /* If the new pointer is greater than the current max, drop it */
- if (heap->gt(p, ptrs[0]))
- return p;
-
- /* Replace the current max and heapify */
- return heap_replace_max(heap, p);
-}
-
void *heap_remove(struct ptr_heap *heap)
{
void **ptrs = heap->ptrs;