atomic/atomic_common.h
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 /* 
  * $Id$
  * 
  * Copyright (C) 2006 iptelorg GmbH
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 /*
  * common part for all the atomic operations (atomic_t and common operations)
  *  See atomic_ops.h for more info.
  */
 /* 
  * History:
  * --------
  *  2006-03-08  created by andrei
  *  2007-05-13  split from atomic_ops.h (andrei)
  */
 #ifndef __atomic_common
 #define __atomic_common
 
 /* atomic_t defined as a struct to easily catch non atomic ops. on it,
  * e.g.  atomic_t  foo; foo++  will generate a compile error */
 typedef struct{ volatile int val; } atomic_t; 
 
 
 /* store and load operations are atomic on all cpus, note however that they
  * don't include memory barriers so if you want to use atomic_{get,set} 
  * to implement mutexes you must use the mb_* versions or explicitely use
  * the barriers */
 
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 #define atomic_set_int(pvar, i) (*(int*)(pvar)=i)
 #define atomic_set_long(pvar, i) (*(long*)(pvar)=i)
 #define atomic_get_int(pvar) (*(int*)(pvar))
 #define atomic_get_long(pvar) (*(long*)(pvar))
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 #define atomic_set(at_var, value)	(atomic_set_int(&((at_var)->val), (value)))
 
 inline static int atomic_get(atomic_t *v)
 {
 	return atomic_get_int(&(v->val));
 }
 
 
 #endif