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/*
* File : idle.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2009, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2006-03-23 Bernard the first version
*/
#include <rthw.h>
#include <rtthread.h>
#include "kservice.h"
#if defined (RT_USING_HOOK) || defined(RT_USING_HEAP)
#define IDLE_THREAD_STACK_SIZE 256
#else
#define IDLE_THREAD_STACK_SIZE 128
#endif
static struct rt_thread idle;
static rt_uint8_t rt_thread_stack[IDLE_THREAD_STACK_SIZE];
#ifdef RT_USING_HEAP
extern rt_list_t rt_thread_defunct;
#endif
#ifdef RT_USING_HOOK
/**
* @addtogroup Hook
*/
/*@{*/
static void (*rt_thread_idle_hook)();
/**
* This function will set a hook function to idle thread loop.
*
* @param hook the specified hook function
*
* @note the hook function must be simple and never be blocked or suspend.
*/
void rt_thread_idle_sethook(void (*hook)())
{
rt_thread_idle_hook = hook;
}
/*@}*/
#endif
static void rt_thread_idle_entry(void* parameter)
{
while (1)
{
#ifdef RT_USING_HOOK
/* if there is an idle thread hook */
if (rt_thread_idle_hook != RT_NULL) rt_thread_idle_hook();
#endif
#ifdef RT_USING_HEAP
/* check the defunct thread list */
if (!rt_list_isempty(&rt_thread_defunct))
{
rt_base_t lock;
struct rt_thread* thread = rt_list_entry(rt_thread_defunct.next, struct rt_thread, tlist);
/* disable interrupt */
lock = rt_hw_interrupt_disable();
rt_list_remove(&(thread->tlist));
/* enable interrupt */
rt_hw_interrupt_enable(lock);
/* release thread's stack */
rt_free(thread->stack_addr);
#ifdef RT_USING_MODULE
/* release thread point in module */
if(thread->module_parent != RT_NULL)
thread->module_parent->module_thread = RT_NULL;
#endif
/* delete thread object */
rt_object_delete((rt_object_t)thread);
}
#endif
}
}
/**
* @addtogroup SystemInit
*/
/*@{*/
/**
* This function will initialize idle thread, then start it.
*
* @note this function must be invoked when system init.
*/
void rt_thread_idle_init()
{
/* init thread */
rt_thread_init(&idle,
"tidle",
rt_thread_idle_entry, RT_NULL,
&rt_thread_stack[0], sizeof(rt_thread_stack),
RT_THREAD_PRIORITY_MAX - 1, 32);
/* startup */
rt_thread_startup(&idle);
}
/*@}*/
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