64 lines
1.7 KiB
C
64 lines
1.7 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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#include "kernel.h"
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#include "thread.h"
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long current_tick = 0;
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void sleep(int ticks)
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{
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int timeout = current_tick + ticks;
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/* always yield at least once */
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do {
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yield();
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} while (TIME_BEFORE( current_tick, timeout ));
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}
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void yield(void)
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{
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switch_thread();
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}
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/****************************************************************************
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* Queue handling stuff
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****************************************************************************/
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void queue_init(struct event_queue *q)
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{
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q->read = 0;
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q->write = 0;
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}
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struct event *queue_wait(struct event_queue *q)
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{
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while(q->read == q->write)
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{
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switch_thread();
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}
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return &q->events[(q->read++) & QUEUE_LENGTH_MASK];
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}
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void queue_post(struct event_queue *q, int id, void *data)
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{
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int wr = (q->write++) & QUEUE_LENGTH_MASK;
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q->events[wr].id = id;
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q->events[wr].data = data;
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}
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