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Code Issues Releases Wiki Activity

lib/dns/dbtable.c: use isc_refcount_t

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Ondřej Surý 2019-05-20 16:22:15 +02:00 committed by Witold Kręcicki
parent 757cff6644
commit d108e86cc8
1 changed files with 8 additions and 29 deletions
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37
lib/dns/dbtable.c
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@ -25,10 +25,9 @@ struct dns_dbtable {
unsigned int magic;
isc_mem_t * mctx;
dns_rdataclass_t rdclass;
isc_mutex_t lock;
isc_rwlock_t tree_lock;
/* Locked by lock. */
unsigned int references;
/* Protected by atomics */
isc_refcount_t references;
/* Locked by tree_lock. */
dns_rbt_t * rbt;
dns_db_t * default_db;
@ -65,8 +64,6 @@ dns_dbtable_create(isc_mem_t *mctx, dns_rdataclass_t rdclass,
if (result != ISC_R_SUCCESS)
goto clean1;
isc_mutex_init(&dbtable->lock);
result = isc_rwlock_init(&dbtable->tree_lock, 0, 0);
if (result != ISC_R_SUCCESS)
goto clean3;
@ -76,15 +73,13 @@ dns_dbtable_create(isc_mem_t *mctx, dns_rdataclass_t rdclass,
isc_mem_attach(mctx, &dbtable->mctx);
dbtable->rdclass = rdclass;
dbtable->magic = DBTABLE_MAGIC;
dbtable->references = 1;
isc_refcount_init(&dbtable->references, 1);
*dbtablep = dbtable;
return (ISC_R_SUCCESS);
clean3:
isc_mutex_destroy(&dbtable->lock);
dns_rbt_destroy(&dbtable->rbt);
clean1:
@ -120,13 +115,7 @@ dns_dbtable_attach(dns_dbtable_t *source, dns_dbtable_t **targetp) {
REQUIRE(VALID_DBTABLE(source));
REQUIRE(targetp != NULL && *targetp == NULL);
LOCK(&source->lock);
INSIST(source->references > 0);
source->references++;
INSIST(source->references != 0);
UNLOCK(&source->lock);
isc_refcount_increment(&source->references);
*targetp = source;
}
@ -134,25 +123,15 @@ dns_dbtable_attach(dns_dbtable_t *source, dns_dbtable_t **targetp) {
void
dns_dbtable_detach(dns_dbtable_t **dbtablep) {
dns_dbtable_t *dbtable;
bool free_dbtable = false;
REQUIRE(dbtablep != NULL);
dbtable = *dbtablep;
REQUIRE(VALID_DBTABLE(dbtable));
LOCK(&dbtable->lock);
INSIST(dbtable->references > 0);
dbtable->references--;
if (dbtable->references == 0)
free_dbtable = true;
UNLOCK(&dbtable->lock);
if (free_dbtable)
dbtable_free(dbtable);
*dbtablep = NULL;
if (isc_refcount_decrement(&dbtable->references) == 1) {
dbtable_free(dbtable);
}
}
isc_result_t