mirror of
https://gitlab.isc.org/isc-projects/bind9
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120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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/*! \file */
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#include <stddef.h>
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#include <isc/atomic.h>
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#include <isc/quota.h>
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#include <isc/util.h>
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void
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isc_quota_init(isc_quota_t *quota, unsigned int max) {
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atomic_init("a->max, max);
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atomic_init("a->used, 0);
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atomic_init("a->soft, 0);
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}
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void
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isc_quota_destroy(isc_quota_t *quota) {
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INSIST(atomic_load("a->used) == 0);
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atomic_store_release("a->max, 0);
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atomic_store_release("a->used, 0);
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atomic_store_release("a->soft, 0);
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}
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void
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isc_quota_soft(isc_quota_t *quota, unsigned int soft) {
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atomic_store_release("a->soft, soft);
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}
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void
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isc_quota_max(isc_quota_t *quota, unsigned int max) {
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atomic_store_release("a->max, max);
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}
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unsigned int
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isc_quota_getmax(isc_quota_t *quota) {
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return (atomic_load_relaxed("a->max));
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}
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unsigned int
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isc_quota_getsoft(isc_quota_t *quota) {
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return (atomic_load_relaxed("a->soft));
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}
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unsigned int
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isc_quota_getused(isc_quota_t *quota) {
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return (atomic_load_relaxed("a->used));
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}
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isc_result_t
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isc_quota_reserve(isc_quota_t *quota) {
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isc_result_t result;
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uint32_t max = atomic_load_acquire("a->max);
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uint32_t soft = atomic_load_acquire("a->soft);
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uint32_t used = atomic_fetch_add_relaxed("a->used, 1);
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if (max == 0 || used < max) {
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if (soft == 0 || used < soft) {
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result = ISC_R_SUCCESS;
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} else {
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result = ISC_R_SOFTQUOTA;
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}
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} else {
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INSIST(atomic_fetch_sub_release("a->used, 1) > 0);
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result = ISC_R_QUOTA;
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}
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return (result);
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}
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void
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isc_quota_release(isc_quota_t *quota) {
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INSIST(atomic_fetch_sub_release("a->used, 1) > 0);
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}
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static isc_result_t
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doattach(isc_quota_t *quota, isc_quota_t **p, bool force) {
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isc_result_t result;
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REQUIRE(p != NULL && *p == NULL);
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result = isc_quota_reserve(quota);
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if (result == ISC_R_SUCCESS || result == ISC_R_SOFTQUOTA) {
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*p = quota;
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} else if (result == ISC_R_QUOTA && force) {
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/* attach anyway */
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atomic_fetch_add_relaxed("a->used, 1);
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*p = quota;
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result = ISC_R_SUCCESS;
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}
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return (result);
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}
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isc_result_t
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isc_quota_attach(isc_quota_t *quota, isc_quota_t **p) {
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return (doattach(quota, p, false));
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}
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isc_result_t
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isc_quota_force(isc_quota_t *quota, isc_quota_t **p) {
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return (doattach(quota, p, true));
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}
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void
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isc_quota_detach(isc_quota_t **p) {
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INSIST(p != NULL && *p != NULL);
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isc_quota_release(*p);
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*p = NULL;
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}
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