102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/*
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* Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 2000, 2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: quota.c,v 1.18 2007/06/19 23:47:17 tbox Exp $ */
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/*! \file */
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#include <config.h>
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#include <stddef.h>
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#include <isc/quota.h>
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#include <isc/util.h>
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isc_result_t
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isc_quota_init(isc_quota_t *quota, int max) {
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quota->max = max;
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quota->used = 0;
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quota->soft = 0;
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return (isc_mutex_init("a->lock));
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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(quota->used == 0);
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quota->max = 0;
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quota->used = 0;
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quota->soft = 0;
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DESTROYLOCK("a->lock);
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}
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void
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isc_quota_soft(isc_quota_t *quota, int soft) {
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LOCK("a->lock);
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quota->soft = soft;
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UNLOCK("a->lock);
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}
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void
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isc_quota_max(isc_quota_t *quota, int max) {
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LOCK("a->lock);
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quota->max = max;
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UNLOCK("a->lock);
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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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LOCK("a->lock);
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if (quota->max == 0 || quota->used < quota->max) {
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if (quota->soft == 0 || quota->used < quota->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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quota->used++;
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} else
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result = ISC_R_QUOTA;
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UNLOCK("a->lock);
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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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LOCK("a->lock);
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INSIST(quota->used > 0);
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quota->used--;
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UNLOCK("a->lock);
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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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{
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isc_result_t result;
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INSIST(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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return (result);
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}
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void
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isc_quota_detach(isc_quota_t **p)
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{
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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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