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Partial fix for RT #2053. The potential for deadlock still exists,

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but it is much less likely to occur because we now only take the ADB lock when the
external reference count reaches zero, not every time it is decremented.
Althought this does not actually fix the bug, it at least lets us make
progress on testing fixes for other bugs affecting shutdown of multithreaded
servers.
This commit is contained in:
Andreas Gustafsson 2001-11-14 22:32:10 +00:00
parent 08e4f1ac94
commit ca50fa0230
1 changed files with 14 additions and 26 deletions
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40
lib/dns/adb.c
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@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: adb.c,v 1.191 2001/11/12 19:05:10 gson Exp $ */
/* $Id: adb.c,v 1.192 2001/11/14 22:32:10 gson Exp $ */
/*
* Implementation notes
@ -1239,27 +1239,6 @@ inc_adb_erefcnt(dns_adb_t *adb) {
UNLOCK(&adb->reflock);
}
static inline void
dec_adb_erefcnt(dns_adb_t *adb, isc_boolean_t lock) {
isc_boolean_t zeroerefcnt;
if (lock)
LOCK(&adb->lock);
INSIST(adb->erefcnt > 0);
LOCK(&adb->reflock);
adb->erefcnt--;
zeroerefcnt = ISC_TF(adb->erefcnt == 0);
UNLOCK(&adb->reflock);
if (zeroerefcnt)
check_exit(adb);
if (lock)
UNLOCK(&adb->lock);
}
static inline void
inc_entry_refcnt(dns_adb_t *adb, dns_adbentry_t *entry, isc_boolean_t lock) {
int bucket;
@ -2367,17 +2346,26 @@ dns_adb_attach(dns_adb_t *adb, dns_adb_t **adbx) {
void
dns_adb_detach(dns_adb_t **adbx) {
dns_adb_t *adb;
isc_boolean_t zeroerefcnt;
REQUIRE(adbx != NULL && DNS_ADB_VALID(*adbx));
adb = *adbx;
*adbx = NULL;
LOCK(&adb->lock);
dec_adb_erefcnt(adb, ISC_FALSE);
if (adb->erefcnt == 0)
INSIST(adb->erefcnt > 0);
LOCK(&adb->reflock);
adb->erefcnt--;
zeroerefcnt = ISC_TF(adb->erefcnt == 0);
UNLOCK(&adb->reflock);
if (zeroerefcnt) {
LOCK(&adb->lock);
check_exit(adb);
INSIST(adb->shutting_down);
UNLOCK(&adb->lock);
UNLOCK(&adb->lock);
}
}
void