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/*
* Defines for low level queue management
*
* Author: Ralf Corsepius (corsepiu@faw.uni-ulm.de)
*
* COPYRIGHT (c) 1997-1998, Ralf Corsepius, Germany
*
* This program 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.
*
*
* COPYRIGHT (c) 1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*
*/
#ifndef _io_queue_h
#define _io_queue_h
#include <stdlib.h> /* size_t */
/*
* NOTE: size needs to be a power of 2
*/
#define IO_QUEUE(type,size,name) \
typedef struct { \
volatile type queue[size] ; \
volatile unsigned short tail ; \
volatile unsigned short head ; \
} name ;
#define IO_QUEUE_FULL(queue, size) \
((queue)->tail == (((queue)->head+1) & ((size)-1)))
#define IO_QUEUE_EMPTY(queue) \
(((queue)->tail) == ((queue)->head))
#define IO_QUEUE_INIT(queue) \
(queue)->tail = (queue)->head = 0
#define IO_QUEUE_ADD(queue,size) \
(queue)->head = (((queue)->head + 1) & ((size)-1))
#define IO_QUEUE_SUB(queue,size) \
(queue)->tail = (((queue)->tail + 1) & ((size)-1))
#define IO_QUEUE_PUT(_queue,item) \
{ \
size_t i; \
unsigned char* dest = (unsigned char*) ((_queue)->queue[(_queue)->head]); \
unsigned char* src = (unsigned char*) (item); \
for( i = 0; i < sizeof(item); i++) \
{ \
dest[i] = src[i]; \
} \
}
#define IO_QUEUE_GET(_queue,item) \
{\
size_t i; \
unsigned char *src = (unsigned char*) (_queue)->queue[(_queue)->tail]; \
unsigned char *dest = (unsigned char*) (item); \
for( i=0; i< sizeof(item); i++)\
{\
dest[i] = src[i]; \
}\
}
#endif
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