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lib/isc/quota.c: use proper acquire/release/relaxed memory order semantics

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This commit is contained in:
Ondřej Surý 2019-05-20 16:59:11 +02:00 committed by Witold Kręcicki
parent 244ac0601f
commit cbe8034dc8
1 changed files with 14 additions and 14 deletions
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28
lib/isc/quota.c
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@ -21,27 +21,27 @@
void
isc_quota_init(isc_quota_t *quota, unsigned int max) {
atomic_store(&quota->max, max);
atomic_store(&quota->used, 0);
atomic_store(&quota->soft, 0);
atomic_init(&quota->max, max);
atomic_init(&quota->used, 0);
atomic_init(&quota->soft, 0);
}
void
isc_quota_destroy(isc_quota_t *quota) {
INSIST(atomic_load(&quota->used) == 0);
atomic_store(&quota->max, 0);
atomic_store(&quota->used, 0);
atomic_store(&quota->soft, 0);
atomic_store_release(&quota->max, 0);
atomic_store_release(&quota->used, 0);
atomic_store_release(&quota->soft, 0);
}
void
isc_quota_soft(isc_quota_t *quota, unsigned int soft) {
atomic_store(&quota->soft, soft);
atomic_store_release(&quota->soft, soft);
}
void
isc_quota_max(isc_quota_t *quota, unsigned int max) {
atomic_store(&quota->max, max);
atomic_store_release(&quota->max, max);
}
unsigned int
@ -62,9 +62,9 @@ isc_quota_getused(isc_quota_t *quota) {
isc_result_t
isc_quota_reserve(isc_quota_t *quota) {
isc_result_t result;
uint32_t max = atomic_load(&quota->max);
uint32_t soft = atomic_load(&quota->soft);
uint32_t used = atomic_fetch_add(&quota->used, 1);
uint32_t max = atomic_load_acquire(&quota->max);
uint32_t soft = atomic_load_acquire(&quota->soft);
uint32_t used = atomic_fetch_add_relaxed(&quota->used, 1);
if (max == 0 || used < max) {
if (soft == 0 || used < soft) {
result = ISC_R_SUCCESS;
@ -72,7 +72,7 @@ isc_quota_reserve(isc_quota_t *quota) {
result = ISC_R_SOFTQUOTA;
}
} else {
INSIST(atomic_fetch_sub(&quota->used, 1) > 0);
INSIST(atomic_fetch_sub_release(&quota->used, 1) > 0);
result = ISC_R_QUOTA;
}
return (result);
@ -80,7 +80,7 @@ isc_quota_reserve(isc_quota_t *quota) {
void
isc_quota_release(isc_quota_t *quota) {
INSIST(atomic_fetch_sub(&quota->used, 1) > 0);
INSIST(atomic_fetch_sub_release(&quota->used, 1) > 0);
}
static isc_result_t
@ -93,7 +93,7 @@ doattach(isc_quota_t *quota, isc_quota_t **p, bool force) {
*p = quota;
} else if (result == ISC_R_QUOTA && force) {
/* attach anyway */
atomic_fetch_add(&quota->used, 1);
atomic_fetch_add_relaxed(&quota->used, 1);
*p = quota;
result = ISC_R_SUCCESS;
}