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/*
* File : lfq.h
* Author : Jérémy Zurcher <jeremy@asynk.ch>
* Date : 02/11/09
* License :
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef _LFQ_H_
#define _LFQ_H_
# ifdef __cplusplus
extern "C" {
# endif /* __cplusplus */
typedef union pointer {
struct split {
volatile union pointer *next;
volatile unsigned int count;
} split;
volatile unsigned long long concat;
} pointer_t;
typedef struct queue {
pointer_t head;
pointer_t tail;
} lfq_t;
/* initialize an empty lfq structure */
void lfq_init( lfq_t *q );
/* push a node at the tail of q */
void lfq_push_tail( lfq_t *q, pointer_t *node );
/* pop a node from the head of q */
pointer_t* pop_head( lfq_t *q );
# ifdef __cplusplus
}
# endif /* __cplusplus */
# endif /* _LFQ_H_ */
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