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Edit File : quota.h \| Size : 2.38 KB
/* * 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 */ Back

Edit File : quota.h | Size : 2.38 KB

/*
 * 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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