diff options
Diffstat (limited to 'lib/isc/quota.c')
| -rw-r--r-- | lib/isc/quota.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/lib/isc/quota.c b/lib/isc/quota.c new file mode 100644 index 0000000..9290167 --- /dev/null +++ b/lib/isc/quota.c @@ -0,0 +1,101 @@ +/* + * Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 2000, 2001 Internet Software Consortium. + * + * Permission to use, copy, modify, and 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 1.13.18.3 2005/07/27 02:44:21 marka 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; +} |
