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/*
* Copyright © 2009 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao.h"
#ifndef HAS_MUTEX_TRY
#define HAS_MUTEX_TRY 1
#endif
#if HAS_MUTEX_TRY
uint8_t
ao_mutex_try(__xdata uint8_t *mutex, uint8_t task_id) __reentrant
{
uint8_t ret;
if (*mutex == task_id)
ao_panic(AO_PANIC_MUTEX);
ao_arch_critical(
if (*mutex)
ret = 0;
else {
*mutex = task_id;
ret = 1;
});
return ret;
}
#endif
void
ao_mutex_get(__xdata uint8_t *mutex) __reentrant
{
if (*mutex == ao_cur_task->task_id)
ao_panic(AO_PANIC_MUTEX);
ao_arch_critical(
while (*mutex)
ao_sleep(mutex);
*mutex = ao_cur_task->task_id;
);
}
void
ao_mutex_put(__xdata uint8_t *mutex) __reentrant
{
if (*mutex != ao_cur_task->task_id)
ao_panic(AO_PANIC_MUTEX);
ao_arch_critical(
*mutex = 0;
ao_wakeup(mutex);
);
}
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