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Directly use return value of atomic_compare_exchange_strong_explicit insteaf of comparing expected value

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This commit is contained in:
Ondřej Surý 2018-08-23 15:30:06 +02:00
parent b5709e5531
commit 9d5df99a9d
1 changed files with 8 additions and 6 deletions
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14
lib/isc/rwlock.c
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@ -308,13 +308,13 @@ isc__rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type) {
}
while (1) {
int_fast32_t cntflag2 = 0;
atomic_compare_exchange_strong_explicit
(&rwl->cnt_and_flag, &cntflag2, WRITER_ACTIVE,
memory_order_relaxed, memory_order_relaxed);
if (cntflag2 == 0)
int_fast32_t zero = 0;
if (atomic_compare_exchange_strong_explicit
(&rwl->cnt_and_flag, &zero, WRITER_ACTIVE,
memory_order_relaxed, memory_order_relaxed))
{
break;
}
/* Another active reader or writer is working. */
LOCK(&rwl->lock);
@ -409,7 +409,9 @@ isc_rwlock_trylock(isc_rwlock_t *rwl, isc_rwlocktype_t type) {
if (!atomic_compare_exchange_strong_explicit
(&rwl->cnt_and_flag, &zero, WRITER_ACTIVE,
memory_order_relaxed, memory_order_relaxed))
{
return (ISC_R_LOCKBUSY);
}
/*
* XXXJT: jump into the queue, possibly breaking the writer