kamailio/modules/ims_qos/sem.h

/*
 * $Id$
 *
 * Copyright (C) 2012 Smile Communications, [email protected]
 * Copyright (C) 2012 Smile Communications, [email protected]
 * 
 * The initial version of this code was written by Dragos Vingarzan
 * (dragos(dot)vingarzan(at)fokus(dot)fraunhofer(dot)de and the
 * Fruanhofer Institute. It was and still is maintained in a separate
 * branch of the original SER. We are therefore migrating it to
 * Kamailio/SR and look forward to maintaining it from here on out.
 * 2011/2012 Smile Communications, Pty. Ltd.
 * ported/maintained/improved by 
 * Jason Penton (jason(dot)penton(at)smilecoms.com and
 * Richard Good (richard(dot)good(at)smilecoms.com) as part of an 
 * effort to add full IMS support to Kamailio/SR using a new and
 * improved architecture
 * 
 * NB: Alot of this code was originally part of OpenIMSCore,
 * FhG Fokus. 
 * Copyright (C) 2004-2006 FhG Fokus
 * Thanks for great work! This is an effort to 
 * break apart the various CSCF functions into logically separate
 * components. We hope this will drive wider use. We also feel
 * that in this way the architecture is more complete and thereby easier
 * to manage in the Kamailio/SR environment
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * Kamailio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 *
 *
 * History:
 * --------
 *  2011-02-02  initial version (jason.penton)
 */

#ifndef __SEM_H
#define __SEM_H

	#include <semaphore.h>

	typedef sem_t gen_sem_t;

	/**
	 * Create a new unnamed semaphore and initialize it
	 * @param value - 0 if it should be pre-locked, 1 if not, or how many locks until block
	 * @return
	 */
    #define sem_new(sem_ptr,value)\
	do {\
		sem_ptr=shm_malloc(sizeof(gen_sem_t));\
		if (!sem_ptr){\
			LM_ERR("Error allocating %lx bytes of shm!\n",sizeof(gen_sem_t));\
		}	\
		if (sem_init(sem_ptr, 1, value)<0) {\
			LM_ERR("Error > %s\n",strerror(errno));\
		}\
	} while(0)
	
    #define sem_free(sem)\
	do {\
		if (sem) {\
			sem_destroy(sem);\
			shm_free(sem);\
			sem=0;\
		}\
	} while(0)
	
	
	#define sem_get(sem) sem_wait(sem)
	#define sem_tryget(sem) sem_trywait(sem)
	#define sem_timedget(sem,abs_timeout) sem_trywait(sem,abs_timeout)
	
	#define sem_release(sem) sem_post(sem)

#endif