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/*
* Copyright (C) 2014 Internet Systems Consortium, Inc. ("ISC")
*
* 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.
*/
#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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