55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Björn Stenberg
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef _KERNEL_H_
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#define _KERNEL_H_
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/* wrap-safe macros for tick comparison */
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#define TIME_AFTER(a,b) ((long)(b) - (long)(a) < 0)
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#define TIME_BEFORE(a,b) TIME_AFTER(b,a)
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#define HZ 100 /* number of ticks per second */
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#define QUEUE_LENGTH 16 /* MUST be a power of 2 */
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#define QUEUE_LENGTH_MASK (QUEUE_LENGTH - 1)
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struct event
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{
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int id;
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void *data;
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};
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struct event_queue
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{
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struct event events[QUEUE_LENGTH];
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unsigned int read;
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unsigned int write;
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};
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/* global tick variable */
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extern long current_tick;
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/* kernel functions */
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extern void yield(void);
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extern void sleep(int ticks);
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extern void queue_init(struct event_queue *q);
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extern struct event *queue_wait(struct event_queue *q);
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extern void queue_post(struct event_queue *q, int id, void *data);
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#endif
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