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/*===========================================================================
*
* PUBLIC DOMAIN NOTICE
* National Center for Biotechnology Information
*
* This software/database is a "United States Government Work" under the
* terms of the United States Copyright Act. It was written as part of
* the author's official duties as a United States Government employee and
* thus cannot be copyrighted. This software/database is freely available
* to the public for use. The National Library of Medicine and the U.S.
* Government have not placed any restriction on its use or reproduction.
*
* Although all reasonable efforts have been taken to ensure the accuracy
* and reliability of the software and data, the NLM and the U.S.
* Government do not and cannot warrant the performance or results that
* may be obtained by using this software or data. The NLM and the U.S.
* Government disclaim all warranties, express or implied, including
* warranties of performance, merchantability or fitness for any particular
* purpose.
*
* Please cite the author in any work or product based on this material.
*
* ===========================================================================
*
*/
#ifndef _h_ngs_engine_atomic32_
#define _h_ngs_engine_atomic32_
typedef struct atomic32_t atomic32_t;
struct atomic32_t
{
volatile int counter;
};
#ifdef __cplusplus
extern "C" {
#endif
/* int atomic32_read ( const atomic32_t *v ); */
#define atomic32_read( v ) \
( ( v ) -> counter )
/* void atomic32_set ( atomic32_t *v, int i ); */
#define atomic32_set( v, i ) \
( ( void ) ( ( ( v ) -> counter ) = ( i ) ) )
/* add to v -> counter and return the prior value */
/* int atomic32_read_and_add ( atomic32_t *v, int i ) */
#define atomic32_read_and_add( v, i ) \
__sync_fetch_and_add ( ( volatile unsigned int * ) & ( v ) -> counter, ( i ) )
/* void atomic32_dec ( atomic32_t *v ) */
#define atomic32_dec( v ) \
__sync_sub_and_fetch ( ( volatile unsigned int * ) & ( v ) -> counter, 1 )
/* int atomic32_test_and_set ( atomic32_t *v, int s, int t ) */
#define atomic32_test_and_set( v, s, t ) \
__sync_val_compare_and_swap ( ( volatile unsigned int * ) & ( v ) -> counter, ( t ), ( s ) )
static __inline int atomic32_read_and_add_gt ( atomic32_t *v, int i, int t )
{
int val, val_intern;
for ( val = atomic32_read ( v ); val > t; val = val_intern )
{
val_intern = atomic32_test_and_set ( v, val + i, val );
if ( val_intern == val )
break;
}
return val;
}
#ifdef __cplusplus
}
#endif
#endif /* _h_ngs_engine_atomic32_ */
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