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/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#ifndef ISC_COUNTER_H
#define ISC_COUNTER_H 1

/*****
 ***** Module Info
 *****/

/*! \file isc/counter.h
 *
 * \brief The isc_counter_t object is a simplified version of the
 * isc_quota_t object; it tracks the consumption of limited
 * resources, returning an error condition when the quota is
 * exceeded.  However, unlike isc_quota_t, attaching and detaching
 * from a counter object does not increment or decrement the counter.
 */

/***
 *** Imports.
 ***/

#include <isc/lang.h>
#include <isc/mutex.h>
#include <isc/types.h>

/*****
 ***** Types.
 *****/

ISC_LANG_BEGINDECLS

isc_result_t
isc_counter_create(isc_mem_t *mctx, int limit, isc_counter_t **counterp);
/*%<
 * Allocate and initialize a counter object.
 */

isc_result_t
isc_counter_increment(isc_counter_t *counter);
/*%<
 * Increment the counter.
 *
 * If the counter limit is nonzero and has been reached, then
 * return ISC_R_QUOTA, otherwise ISC_R_SUCCESS. (The counter is
 * incremented regardless of return value.)
 */

unsigned int
isc_counter_used(isc_counter_t *counter);
/*%<
 * Return the current counter value.
 */

void
isc_counter_setlimit(isc_counter_t *counter, int limit);
/*%<
 * Set the counter limit.
 */

void
isc_counter_attach(isc_counter_t *source, isc_counter_t **targetp);
/*%<
 * Attach to a counter object, increasing its reference counter.
 */

void
isc_counter_detach(isc_counter_t **counterp);
/*%<
 * Detach (and destroy if reference counter has dropped to zero)
 * a counter object.
 */

ISC_LANG_ENDDECLS

#endif /* ISC_COUNTER_H */

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✏️ counter.h