mirror of
https://github.com/git/git.git
synced 2024-11-24 10:26:17 +08:00
da24b1044f
Use the prio-queue data structure to implement a priority queue of commits sorted by committer date, when handling --date-order. The structure can also be used as a simple LIFO stack, which is a good match for --topo-order processing. Signed-off-by: Junio C Hamano <gitster@pobox.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
#include "cache.h"
|
|
#include "commit.h"
|
|
#include "prio-queue.h"
|
|
|
|
void prio_queue_reverse(struct prio_queue *queue)
|
|
{
|
|
int i, j;
|
|
|
|
if (queue->compare != NULL)
|
|
die("BUG: prio_queue_reverse() on non-LIFO queue");
|
|
for (i = 0; i <= (j = (queue->nr - 1) - i); i++) {
|
|
struct commit *swap = queue->array[i];
|
|
queue->array[i] = queue->array[j];
|
|
queue->array[j] = swap;
|
|
}
|
|
}
|
|
|
|
void clear_prio_queue(struct prio_queue *queue)
|
|
{
|
|
free(queue->array);
|
|
queue->nr = 0;
|
|
queue->alloc = 0;
|
|
queue->array = NULL;
|
|
}
|
|
|
|
void prio_queue_put(struct prio_queue *queue, void *thing)
|
|
{
|
|
prio_queue_compare_fn compare = queue->compare;
|
|
int ix, parent;
|
|
|
|
/* Append at the end */
|
|
ALLOC_GROW(queue->array, queue->nr + 1, queue->alloc);
|
|
queue->array[queue->nr++] = thing;
|
|
if (!compare)
|
|
return; /* LIFO */
|
|
|
|
/* Bubble up the new one */
|
|
for (ix = queue->nr - 1; ix; ix = parent) {
|
|
parent = (ix - 1) / 2;
|
|
if (compare(queue->array[parent], queue->array[ix],
|
|
queue->cb_data) <= 0)
|
|
break;
|
|
|
|
thing = queue->array[parent];
|
|
queue->array[parent] = queue->array[ix];
|
|
queue->array[ix] = thing;
|
|
}
|
|
}
|
|
|
|
void *prio_queue_get(struct prio_queue *queue)
|
|
{
|
|
void *result, *swap;
|
|
int ix, child;
|
|
prio_queue_compare_fn compare = queue->compare;
|
|
|
|
if (!queue->nr)
|
|
return NULL;
|
|
if (!compare)
|
|
return queue->array[--queue->nr]; /* LIFO */
|
|
|
|
result = queue->array[0];
|
|
if (!--queue->nr)
|
|
return result;
|
|
|
|
queue->array[0] = queue->array[queue->nr];
|
|
|
|
/* Push down the one at the root */
|
|
for (ix = 0; ix * 2 + 1 < queue->nr; ix = child) {
|
|
child = ix * 2 + 1; /* left */
|
|
if ((child + 1 < queue->nr) &&
|
|
(compare(queue->array[child], queue->array[child + 1],
|
|
queue->cb_data) >= 0))
|
|
child++; /* use right child */
|
|
|
|
if (compare(queue->array[ix], queue->array[child],
|
|
queue->cb_data) <= 0)
|
|
break;
|
|
|
|
swap = queue->array[child];
|
|
queue->array[child] = queue->array[ix];
|
|
queue->array[ix] = swap;
|
|
}
|
|
return result;
|
|
}
|