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Annotation of embedaddon/ntp/lib/isc/quota.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
        !             3:  * Copyright (C) 2000, 2001  Internet Software Consortium.
        !             4:  *
        !             5:  * Permission to use, copy, modify, and/or distribute this software for any
        !             6:  * purpose with or without fee is hereby granted, provided that the above
        !             7:  * copyright notice and this permission notice appear in all copies.
        !             8:  *
        !             9:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
        !            10:  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
        !            11:  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
        !            12:  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
        !            13:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
        !            14:  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
        !            15:  * PERFORMANCE OF THIS SOFTWARE.
        !            16:  */
        !            17: 
        !            18: /* $Id: quota.c,v 1.18 2007/06/19 23:47:17 tbox Exp $ */
        !            19: 
        !            20: /*! \file */
        !            21: 
        !            22: #include <config.h>
        !            23: 
        !            24: #include <stddef.h>
        !            25: 
        !            26: #include <isc/quota.h>
        !            27: #include <isc/util.h>
        !            28: 
        !            29: isc_result_t
        !            30: isc_quota_init(isc_quota_t *quota, int max) {
        !            31:        quota->max = max;
        !            32:        quota->used = 0;
        !            33:        quota->soft = 0;
        !            34:        return (isc_mutex_init(&quota->lock));
        !            35: }
        !            36: 
        !            37: void
        !            38: isc_quota_destroy(isc_quota_t *quota) {
        !            39:        INSIST(quota->used == 0);
        !            40:        quota->max = 0;
        !            41:        quota->used = 0;
        !            42:        quota->soft = 0;
        !            43:        DESTROYLOCK(&quota->lock);
        !            44: }
        !            45: 
        !            46: void
        !            47: isc_quota_soft(isc_quota_t *quota, int soft) {
        !            48:        LOCK(&quota->lock);
        !            49:        quota->soft = soft;
        !            50:        UNLOCK(&quota->lock);
        !            51: }
        !            52: 
        !            53: void
        !            54: isc_quota_max(isc_quota_t *quota, int max) {
        !            55:        LOCK(&quota->lock);
        !            56:        quota->max = max;
        !            57:        UNLOCK(&quota->lock);
        !            58: }
        !            59: 
        !            60: isc_result_t
        !            61: isc_quota_reserve(isc_quota_t *quota) {
        !            62:        isc_result_t result;
        !            63:        LOCK(&quota->lock);
        !            64:        if (quota->max == 0 || quota->used < quota->max) {
        !            65:                if (quota->soft == 0 || quota->used < quota->soft)
        !            66:                        result = ISC_R_SUCCESS;
        !            67:                else
        !            68:                        result = ISC_R_SOFTQUOTA;
        !            69:                quota->used++;
        !            70:        } else
        !            71:                result = ISC_R_QUOTA;
        !            72:        UNLOCK(&quota->lock);
        !            73:        return (result);
        !            74: }
        !            75: 
        !            76: void
        !            77: isc_quota_release(isc_quota_t *quota) {
        !            78:        LOCK(&quota->lock);
        !            79:        INSIST(quota->used > 0);
        !            80:        quota->used--;
        !            81:        UNLOCK(&quota->lock);
        !            82: }
        !            83: 
        !            84: isc_result_t
        !            85: isc_quota_attach(isc_quota_t *quota, isc_quota_t **p)
        !            86: {
        !            87:        isc_result_t result;
        !            88:        INSIST(p != NULL && *p == NULL);
        !            89:        result = isc_quota_reserve(quota);
        !            90:        if (result == ISC_R_SUCCESS || result == ISC_R_SOFTQUOTA)
        !            91:                *p = quota;
        !            92:        return (result);
        !            93: }
        !            94: 
        !            95: void
        !            96: isc_quota_detach(isc_quota_t **p)
        !            97: {
        !            98:        INSIST(p != NULL && *p != NULL);
        !            99:        isc_quota_release(*p);
        !           100:        *p = NULL;
        !           101: }