diff options
Diffstat (limited to 'lib/pqueue.c')
| -rw-r--r-- | lib/pqueue.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/lib/pqueue.c b/lib/pqueue.c index 1e41b092..870f8a7c 100644 --- a/lib/pqueue.c +++ b/lib/pqueue.c @@ -56,14 +56,18 @@ trickle_up (int index, struct pqueue *queue) { /* actually trickle up */ queue->array[index] = queue->array[PARENT_OF (index)]; + if (queue->update != NULL) + (*queue->update) (queue->array[index], index); index = PARENT_OF (index); } /* Restore the tmp node to appropriate place. */ queue->array[index] = tmp; + if (queue->update != NULL) + (*queue->update) (tmp, index); } -static void +void trickle_down (int index, struct pqueue *queue) { void *tmp; @@ -90,11 +94,15 @@ trickle_down (int index, struct pqueue *queue) /* Actually trickle down the tmp node. */ queue->array[index] = queue->array[which]; + if (queue->update != NULL) + (*queue->update) (queue->array[index], index); index = which; } /* Restore the tmp node to appropriate place. */ queue->array[index] = tmp; + if (queue->update != NULL) + (*queue->update) (tmp, index); } struct pqueue * @@ -110,6 +118,8 @@ pqueue_create () memset (queue->array, 0, DATA_SIZE * PQUEUE_INIT_ARRAYSIZE); queue->array_size = PQUEUE_INIT_ARRAYSIZE; + /* By default we want nothing to happen when a node changes. */ + queue->update = NULL; return queue; } @@ -146,6 +156,8 @@ pqueue_enqueue (void *data, struct pqueue *queue) return; queue->array[queue->size] = data; + if (queue->update != NULL) + (*queue->update) (data, queue->size); trickle_up (queue->size, queue); queue->size ++; } |