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//usr/include/isc/counter.h
/* * 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 */
