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Remove checks for atomic rwlock from rbtdb.cz and zone.c

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This commit is contained in:
Ondřej Surý 2018-08-17 12:54:27 +02:00
parent 2b74478c8f
commit 7fbbf09d21
2 changed files with 0 additions and 56 deletions
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45
lib/dns/rbtdb.c
View file

@ -134,31 +134,10 @@ typedef uint32_t rbtdb_rdatatype_t;
#define RBTDB_RDATATYPE_NCACHEANY \
RBTDB_RDATATYPE_VALUE(0, dns_rdatatype_any)
/*
* We use rwlock for DB lock only when ISC_RWLOCK_USEATOMIC is non 0.
* Using rwlock is effective with regard to lookup performance only when
* it is implemented in an efficient way.
* Otherwise, it is generally wise to stick to the simple locking since rwlock
* would require more memory or can even make lookups slower due to its own
* overhead (when it internally calls mutex locks).
*/
#ifdef ISC_RWLOCK_USEATOMIC
#define DNS_RBTDB_USERWLOCK 1
#else
#define DNS_RBTDB_USERWLOCK 0
#endif
#if DNS_RBTDB_USERWLOCK
#define RBTDB_INITLOCK(l) isc_rwlock_init((l), 0, 0)
#define RBTDB_DESTROYLOCK(l) isc_rwlock_destroy(l)
#define RBTDB_LOCK(l, t) RWLOCK((l), (t))
#define RBTDB_UNLOCK(l, t) RWUNLOCK((l), (t))
#else
#define RBTDB_INITLOCK(l) isc_mutex_init(l)
#define RBTDB_DESTROYLOCK(l) DESTROYLOCK(l)
#define RBTDB_LOCK(l, t) LOCK(l)
#define RBTDB_UNLOCK(l, t) UNLOCK(l)
#endif
/*
* Since node locking is sensitive to both performance and memory footprint,
@ -179,7 +158,6 @@ typedef uint32_t rbtdb_rdatatype_t;
* Note that we cannot use NODE_LOCK()/NODE_UNLOCK() wherever the protected
* section is also protected by NODE_STRONGLOCK().
*/
#if defined(ISC_RWLOCK_USEATOMIC) && defined(DNS_RBT_USEISCREFCOUNT)
typedef isc_rwlock_t nodelock_t;
#define NODE_INITLOCK(l) isc_rwlock_init((l), 0, 0)
@ -193,21 +171,6 @@ typedef isc_rwlock_t nodelock_t;
#define NODE_WEAKLOCK(l, t) NODE_LOCK(l, t)
#define NODE_WEAKUNLOCK(l, t) NODE_UNLOCK(l, t)
#define NODE_WEAKDOWNGRADE(l) isc_rwlock_downgrade(l)
#else
typedef isc_mutex_t nodelock_t;
#define NODE_INITLOCK(l) isc_mutex_init(l)
#define NODE_DESTROYLOCK(l) DESTROYLOCK(l)
#define NODE_LOCK(l, t) LOCK(l)
#define NODE_UNLOCK(l, t) UNLOCK(l)
#define NODE_TRYUPGRADE(l) ISC_R_SUCCESS
#define NODE_STRONGLOCK(l) LOCK(l)
#define NODE_STRONGUNLOCK(l) UNLOCK(l)
#define NODE_WEAKLOCK(l, t) ((void)0)
#define NODE_WEAKUNLOCK(l, t) ((void)0)
#define NODE_WEAKDOWNGRADE(l) ((void)0)
#endif
/*%
* Whether to rate-limit updating the LRU to avoid possible thread contention.
@ -466,11 +429,7 @@ struct dns_rbtdb {
/* Unlocked. */
dns_db_t common;
/* Locks the data in this struct */
#if DNS_RBTDB_USERWLOCK
isc_rwlock_t lock;
#else
isc_mutex_t lock;
#endif
/* Locks the tree structure (prevents nodes appearing/disappearing) */
isc_rwlock_t tree_lock;
/* Locks for individual tree nodes */
@ -4474,10 +4433,6 @@ check_stale_header(dns_rbtnode_t *node, rdatasetheader_t *header,
rbtdb_search_t *search, rdatasetheader_t **header_prev)
{
#if !defined(ISC_RWLOCK_USEATOMIC) || !defined(DNS_RBT_USEISCREFCOUNT)
UNUSED(lock);
#endif
if (!ACTIVE(header, search->now)) {
dns_ttl_t stale = header->rdh_ttl +
search->rbtdb->serve_stale_ttl;

11
lib/dns/zone.c
View file

@ -177,17 +177,10 @@ typedef struct dns_include dns_include_t;
do { result = isc_mutex_trylock(&(z)->lock); } while (0)
#endif
#ifdef ISC_RWLOCK_USEATOMIC
#define ZONEDB_INITLOCK(l) isc_rwlock_init((l), 0, 0)
#define ZONEDB_DESTROYLOCK(l) isc_rwlock_destroy(l)
#define ZONEDB_LOCK(l, t) RWLOCK((l), (t))
#define ZONEDB_UNLOCK(l, t) RWUNLOCK((l), (t))
#else
#define ZONEDB_INITLOCK(l) isc_mutex_init(l)
#define ZONEDB_DESTROYLOCK(l) DESTROYLOCK(l)
#define ZONEDB_LOCK(l, t) LOCK(l)
#define ZONEDB_UNLOCK(l, t) UNLOCK(l)
#endif
#ifdef ENABLE_AFL
extern bool dns_fuzzing_resolver;
@ -203,11 +196,7 @@ struct dns_zone {
isc_mem_t *mctx;
isc_refcount_t erefs;
#ifdef ISC_RWLOCK_USEATOMIC
isc_rwlock_t dblock;
#else
isc_mutex_t dblock;
#endif
dns_db_t *db; /* Locked by dblock */
/* Locked */