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