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quota.h
/* * 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_QUOTA_H #define ISC_QUOTA_H 1 /***** ***** Module Info *****/ /*! \file isc/quota.h * * \brief The isc_quota_t object is a simple helper object for implementing * quotas on things like the number of simultaneous connections to * a server. It keeps track of the amount of quota in use, and * encapsulates the locking necessary to allow multiple tasks to * share a quota. */ /*** *** Imports. ***/ #include <isc/lang.h> #include <isc/mutex.h> #include <isc/types.h> /***** ***** Types. *****/ ISC_LANG_BEGINDECLS /*% isc_quota structure */ struct isc_quota { isc_mutex_t lock; /*%< Locked by lock. */ int max; int used; int soft; }; isc_result_t isc_quota_init(isc_quota_t *quota, int max); /*%< * Initialize a quota object. * * Returns: * ISC_R_SUCCESS * Other error Lock creation failed. */ void isc_quota_destroy(isc_quota_t *quota); /*%< * Destroy a quota object. */ void isc_quota_soft(isc_quota_t *quota, int soft); /*%< * Set a soft quota. */ void isc_quota_max(isc_quota_t *quota, int max); /*%< * Re-set a maximum quota. */ isc_result_t isc_quota_reserve(isc_quota_t *quota); /*%< * Attempt to reserve one unit of 'quota'. * * Returns: * \li #ISC_R_SUCCESS Success * \li #ISC_R_SOFTQUOTA Success soft quota reached * \li #ISC_R_QUOTA Quota is full */ void isc_quota_release(isc_quota_t *quota); /*%< * Release one unit of quota. */ isc_result_t isc_quota_attach(isc_quota_t *quota, isc_quota_t **p); /*%< * Like isc_quota_reserve, and also attaches '*p' to the * quota if successful (ISC_R_SUCCESS or ISC_R_SOFTQUOTA). */ isc_result_t isc_quota_force(isc_quota_t *quota, isc_quota_t **p); /*%< * Like isc_quota_attach, but will attach '*p' to the quota * even if the hard quota has been exceeded. */ void isc_quota_detach(isc_quota_t **p); /*%< * Like isc_quota_release, and also detaches '*p' from the * quota. */ unsigned int isc_quota_getused(isc_quota_t *quota); /*%< * Get the current usage of quota. */ ISC_LANG_ENDDECLS #endif /* ISC_QUOTA_H */
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