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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* Copyright (C) 2008 University of Chicago.
* See COPYRIGHT notice in top-level directory.
*/
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include "heap-sort.h"
#define NOEXP2
static void heapify(heap_t *heap, int i);
/* From Introduction To Algorithms by Cormen, Leiserson, and Rivest */
static inline int parent(int i) {
return (i/2);
}
static inline int left(int i) {
return (2*i);
}
static inline int right(int i) {
return (2*i + 1);
}
int ADIOI_Heap_create(heap_t *heap, int size) {
heap->size = size;
heap->nodes = (heap_node_t *) ADIOI_Calloc (size, sizeof(heap_node_t));
if (heap->nodes == NULL)
return 1;
else
return 0;
}
void ADIOI_Heap_free(heap_t *heap) {
ADIOI_Free(heap->nodes);
}
/* should suppress unused warnings on GCC */
static void build_heap(heap_t *heap) ATTRIBUTE((unused, used));
static void build_heap(heap_t *heap)
{
int i;
for (i=(heap->size/2-1); i >= 0; i--)
heapify(heap, i);
}
static void heapify(heap_t *heap, int i) {
int l, r, smallest;
heap_node_t *nodes;
heap_node_t tmp_node;
nodes = heap->nodes;
l = left(i);
r = right(i);
if ((l <= heap->size) && (nodes[l].offset < nodes[i].offset))
smallest = l;
else
smallest = i;
if ((r <= heap->size) && (nodes[r].offset < nodes[smallest].offset))
smallest = r;
if (smallest != i) {
tmp_node = nodes[i];
nodes[i] = nodes[smallest];
nodes[smallest] = tmp_node;
heapify(heap, smallest);
}
}
void ADIOI_Heap_insert(heap_t *heap, ADIO_Offset offset, int proc,
ADIO_Offset reg_max_len) {
heap_node_t *nodes;
int i;
nodes = heap->nodes;
i = ++heap->size - 1;
while ((i > 0) && (nodes[parent(i)].offset > offset)) {
nodes[i] = nodes[parent(i)];
i = parent(i);
}
nodes[i].offset = offset;
nodes[i].proc = proc;
nodes[i].reg_max_len = reg_max_len;
}
void ADIOI_Heap_extract_min(heap_t *heap, ADIO_Offset* offset, int *proc,
ADIO_Offset *reg_max_len) {
heap_node_t *nodes;
nodes = heap->nodes;
assert (heap->size > 0);
*offset = nodes[0].offset;
*proc = nodes[0].proc;
*reg_max_len = nodes[0].reg_max_len;
nodes[0] = nodes[heap->size-1];
heap->size--;
heapify(heap, 0);
}
/* should suppress unused warnings on GCC */
static void print_heap(heap_t *heap) ATTRIBUTE((unused, used));
static void print_heap(heap_t *heap)
{
#ifndef NOEXP2
int i;
double level = 0;
int next_level_idx = 1;
printf ("heap->size = %d\n", heap->size);
printf ("offsets:\n");
for (i=0; i < heap->size; i++) {
printf ("%lld ", heap->nodes[i].offset);
if ((i+1) == next_level_idx) {
printf ("\n");
next_level_idx += (int) exp2(level+1);
level++;
}
}
printf ("\n");
#endif
}
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