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/usr/include/kannel/gwlib/counter.h is in kannel-dev 1.4.4-2build1.

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/* ==================================================================== 
 * The Kannel Software License, Version 1.0 
 * 
 * Copyright (c) 2001-2014 Kannel Group  
 * Copyright (c) 1998-2001 WapIT Ltd.   
 * All rights reserved. 
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in 
 *    the documentation and/or other materials provided with the 
 *    distribution. 
 * 
 * 3. The end-user documentation included with the redistribution, 
 *    if any, must include the following acknowledgment: 
 *       "This product includes software developed by the 
 *        Kannel Group (http://www.kannel.org/)." 
 *    Alternately, this acknowledgment may appear in the software itself, 
 *    if and wherever such third-party acknowledgments normally appear. 
 * 
 * 4. The names "Kannel" and "Kannel Group" must not be used to 
 *    endorse or promote products derived from this software without 
 *    prior written permission. For written permission, please  
 *    contact org@kannel.org. 
 * 
 * 5. Products derived from this software may not be called "Kannel", 
 *    nor may "Kannel" appear in their name, without prior written 
 *    permission of the Kannel Group. 
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED.  IN NO EVENT SHALL THE KANNEL GROUP OR ITS CONTRIBUTORS 
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,  
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT  
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR  
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,  
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE  
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,  
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 * ==================================================================== 
 * 
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Kannel Group.  For more information on  
 * the Kannel Group, please see <http://www.kannel.org/>. 
 * 
 * Portions of this software are based upon software originally written at  
 * WapIT Ltd., Helsinki, Finland for the Kannel project.  
 */ 

/*
 * gwlib/counter.h - a counter object
 *
 * Kannel has monotonously growing counters in some places, and these need
 * to work even when several threads use them. This header defines the
 * type Counter that provides such a counter. The counter is a long, and
 * if it reaches LONG_MAX, it wraps around to zero (_NOT_ LONG_MIN).
 *
 * Lars Wirzenius.
 *
 * Changed the counter type 'long' into 'unsigned long' so it wraps
 * by itself. Just keep increasing it.
 * Also added a counter_increase_with function.
 * harrie@lisanza.net
 */


#ifndef COUNTER_H
#define COUNTER_H

typedef struct Counter Counter;

/* create a new counter object. PANIC if fails */
Counter *counter_create(void);

/* destroy it */
void counter_destroy(Counter *counter);

/* return the current value of the counter and increase counter by one */
unsigned long counter_increase(Counter *counter);

/* return the current value of the counter and increase counter by value */
unsigned long counter_increase_with(Counter *counter, unsigned long value);

/* return the current value of the counter */
unsigned long counter_value(Counter *counter);

/* return the current value of the counter and decrease counter by one */
unsigned long counter_decrease(Counter *counter);

/* return the current value of the counter and set it to the supplied value */
unsigned long counter_set(Counter *, unsigned long);

#endif