atomic_ops.c
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 /* 
  * $Id$
  * 
  * Copyright (C) 2006 iptelorg GmbH
  *
  * This file is part of ser, a free SIP server.
  *
  * ser 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
  *
  * For a license to use the ser software under conditions
  * other than those described here, or to purchase support for this
  * software, please contact iptel.org by e-mail at the following addresses:
  *    info@iptel.org
  *
  * ser 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
  */
 /*
  *  atomic operations init
  */
 /* 
  * History:
  * --------
  *  2006-03-08  created by andrei
  */
 
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 #include "atomic_ops_init.h"
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 #include "atomic_ops.h"
 
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 #if defined ATOMIC_OPS_USE_LOCK  || defined MEMBAR_USES_LOCK
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 #include "locking.h"
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 #endif
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 #ifdef MEMBAR_USES_LOCK
 gen_lock_t* __membar_lock=0; /* init in atomic_ops.c */
 #endif
 
 #ifdef ATOMIC_OPS_USE_LOCK
 gen_lock_t* _atomic_lock=0;
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 #endif
 
 
 /* returns 0 on success, -1 on error */
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 int init_atomic_ops()
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 {
 	
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 #ifdef MEMBAR_USES_LOCK
 	if ((__membar_lock=lock_alloc())==0){
 		goto error;
 	}
 	if (lock_init(__membar_lock)==0){
 		lock_dealloc(__membar_lock);
 		__membar_lock=0;
 		goto error;
 	}
 	_membar_lock; /* start with the lock "taken" so that we can safely use
 					 unlock/lock sequences on it later */
 #endif
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 #ifdef ATOMIC_OPS_USE_LOCK
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 	if ((_atomic_lock=lock_alloc())==0){
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 		goto error;
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 	}
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 	if (lock_init(_atomic_lock)==0){
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 		lock_dealloc(_atomic_lock);
 		_atomic_lock=0;
 		goto error;
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 	}
 #endif
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 	return 0;
 #if defined MEMBAR_USES_LOCK || defined ATOMIC_OPS_USE_LOCK
 error:
 	destroy_atomic_ops();
 	return -1;
 #endif
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 }
 
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 void destroy_atomic_ops()
 {
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 #ifdef MEMBAR_USES_LOCK
 	if (__membar_lock!=0){
 		lock_destroy(__membar_lock);
 		lock_dealloc(__membar_lock);
 		__membar_lock=0;
 	}
 #endif
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 #ifdef ATOMIC_OPS_USE_LOCK
 	if (_atomic_lock!=0){
 		lock_destroy(_atomic_lock);
 		lock_dealloc(_atomic_lock);
 		_atomic_lock=0;
 	}
 #endif
 }