85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "prio-queue.h"
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void prio_queue_reverse(struct prio_queue *queue)
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{
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int i, j;
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if (queue->compare != NULL)
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die("BUG: prio_queue_reverse() on non-LIFO queue");
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for (i = 0; i <= (j = (queue->nr - 1) - i); i++) {
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struct commit *swap = queue->array[i];
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queue->array[i] = queue->array[j];
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queue->array[j] = swap;
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}
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}
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void clear_prio_queue(struct prio_queue *queue)
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{
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free(queue->array);
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queue->nr = 0;
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queue->alloc = 0;
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queue->array = NULL;
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}
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void prio_queue_put(struct prio_queue *queue, void *thing)
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{
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prio_queue_compare_fn compare = queue->compare;
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int ix, parent;
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/* Append at the end */
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ALLOC_GROW(queue->array, queue->nr + 1, queue->alloc);
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queue->array[queue->nr++] = thing;
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if (!compare)
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return; /* LIFO */
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/* Bubble up the new one */
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for (ix = queue->nr - 1; ix; ix = parent) {
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parent = (ix - 1) / 2;
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if (compare(queue->array[parent], queue->array[ix],
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queue->cb_data) <= 0)
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break;
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thing = queue->array[parent];
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queue->array[parent] = queue->array[ix];
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queue->array[ix] = thing;
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}
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}
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void *prio_queue_get(struct prio_queue *queue)
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{
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void *result, *swap;
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int ix, child;
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prio_queue_compare_fn compare = queue->compare;
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if (!queue->nr)
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return NULL;
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if (!compare)
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return queue->array[--queue->nr]; /* LIFO */
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result = queue->array[0];
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if (!--queue->nr)
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return result;
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queue->array[0] = queue->array[queue->nr];
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/* Push down the one at the root */
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for (ix = 0; ix * 2 + 1 < queue->nr; ix = child) {
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child = ix * 2 + 1; /* left */
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if ((child + 1 < queue->nr) &&
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(compare(queue->array[child], queue->array[child + 1],
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queue->cb_data) >= 0))
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child++; /* use right child */
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if (compare(queue->array[ix], queue->array[child],
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queue->cb_data) <= 0)
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break;
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swap = queue->array[child];
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queue->array[child] = queue->array[ix];
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queue->array[ix] = swap;
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}
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return result;
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}
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