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git/reftable/pq.c
Patrick Steinhardt 24e0ade65b reftable: introduce REFTABLE_FREE_AND_NULL()
We have several calls to `FREE_AND_NULL()` in the reftable library,
which of course uses free(3P). As the reftable allocators are pluggable
we should rather call the reftable specific function, which is
`reftable_free()`.

Introduce a new macro `REFTABLE_FREE_AND_NULL()` and adapt the callsites
accordingly.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2024-10-02 07:53:56 -07:00

74 lines
1.5 KiB
C

/*
Copyright 2020 Google LLC
Use of this source code is governed by a BSD-style
license that can be found in the LICENSE file or at
https://developers.google.com/open-source/licenses/bsd
*/
#include "pq.h"
#include "reftable-error.h"
#include "reftable-record.h"
#include "system.h"
#include "basics.h"
int pq_less(struct pq_entry *a, struct pq_entry *b)
{
int cmp = reftable_record_cmp(a->rec, b->rec);
if (cmp == 0)
return a->index > b->index;
return cmp < 0;
}
struct pq_entry merged_iter_pqueue_remove(struct merged_iter_pqueue *pq)
{
size_t i = 0;
struct pq_entry e = pq->heap[0];
pq->heap[0] = pq->heap[pq->len - 1];
pq->len--;
while (i < pq->len) {
size_t min = i;
size_t j = 2 * i + 1;
size_t k = 2 * i + 2;
if (j < pq->len && pq_less(&pq->heap[j], &pq->heap[i]))
min = j;
if (k < pq->len && pq_less(&pq->heap[k], &pq->heap[min]))
min = k;
if (min == i)
break;
SWAP(pq->heap[i], pq->heap[min]);
i = min;
}
return e;
}
int merged_iter_pqueue_add(struct merged_iter_pqueue *pq, const struct pq_entry *e)
{
size_t i = 0;
REFTABLE_ALLOC_GROW(pq->heap, pq->len + 1, pq->cap);
if (!pq->heap)
return REFTABLE_OUT_OF_MEMORY_ERROR;
pq->heap[pq->len++] = *e;
i = pq->len - 1;
while (i > 0) {
size_t j = (i - 1) / 2;
if (pq_less(&pq->heap[j], &pq->heap[i]))
break;
SWAP(pq->heap[j], pq->heap[i]);
i = j;
}
return 0;
}
void merged_iter_pqueue_release(struct merged_iter_pqueue *pq)
{
REFTABLE_FREE_AND_NULL(pq->heap);
memset(pq, 0, sizeof(*pq));
}