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/*
* File : waitqueue.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2018/06/26 Bernard Fix the wait queue issue when wakeup a soon
* to blocked thread.
*/
#include <stdint.h>
#include <rthw.h>
#include <rtdevice.h>
#include <rtservice.h>
void rt_wqueue_add(rt_wqueue_t *queue, struct rt_wqueue_node *node)
{
rt_base_t level;
level = rt_hw_interrupt_disable();
rt_list_insert_before(&(queue->waiting_list), &(node->list));
rt_hw_interrupt_enable(level);
}
void rt_wqueue_remove(struct rt_wqueue_node *node)
{
rt_base_t level;
level = rt_hw_interrupt_disable();
rt_list_remove(&(node->list));
rt_hw_interrupt_enable(level);
}
int __wqueue_default_wake(struct rt_wqueue_node *wait, void *key)
{
return 0;
}
void rt_wqueue_wakeup(rt_wqueue_t *queue, void *key)
{
rt_base_t level;
register int need_schedule = 0;
rt_list_t *queue_list;
struct rt_list_node *node;
struct rt_wqueue_node *entry;
queue_list = &(queue->waiting_list);
level = rt_hw_interrupt_disable();
/* set wakeup flag in the queue */
queue->flag = RT_WQ_FLAG_WAKEUP;
if (!(rt_list_isempty(queue_list)))
{
for (node = queue_list->next; node != queue_list; node = node->next)
{
entry = rt_list_entry(node, struct rt_wqueue_node, list);
if (entry->wakeup(entry, key) == 0)
{
rt_thread_resume(entry->polling_thread);
need_schedule = 1;
rt_wqueue_remove(entry);
break;
}
}
}
rt_hw_interrupt_enable(level);
if (need_schedule)
rt_schedule();
}
int rt_wqueue_wait(rt_wqueue_t *queue, int condition, int msec)
{
int tick;
rt_thread_t tid = rt_thread_self();
rt_timer_t tmr = &(tid->thread_timer);
struct rt_wqueue_node __wait;
rt_base_t level;
/* current context checking */
RT_DEBUG_NOT_IN_INTERRUPT;
tick = rt_tick_from_millisecond(msec);
if ((condition) || (tick == 0))
return 0;
__wait.polling_thread = rt_thread_self();
__wait.key = 0;
__wait.wakeup = __wqueue_default_wake;
rt_list_init(&__wait.list);
level = rt_hw_interrupt_disable();
if (queue->flag == RT_WQ_FLAG_WAKEUP)
{
/* already wakeup */
goto __exit_wakeup;
}
rt_wqueue_add(queue, &__wait);
rt_thread_suspend(tid);
/* start timer */
if (tick != RT_WAITING_FOREVER)
{
rt_timer_control(tmr,
RT_TIMER_CTRL_SET_TIME,
&tick);
rt_timer_start(tmr);
}
rt_hw_interrupt_enable(level);
rt_schedule();
level = rt_hw_interrupt_disable();
__exit_wakeup:
queue->flag = 0;
rt_hw_interrupt_enable(level);
rt_wqueue_remove(&__wait);
return 0;
}
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