idle.c.svn-base

RT-Thread是发展中的下一代微内核嵌入式实时操作系统

/*
 * File      : idle.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, 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.fayfayspace.org/license/LICENSE.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-03-23     Bernard      the first version
 */

#include <rtthread.h>

/**
 * @addtogroup Kernel
 */

static struct rt_thread idle;
static void (*rt_thread_idle_hook)();
static rt_uint8 rt_thread_stack[256];

static void rt_thread_idle_entry(void* parameter)
{
	while (1)
	{
		/* if there is an idle thread hook */
		if (rt_thread_idle_hook != RT_NULL)
		{
			rt_thread_idle_hook();
		}

		/* nothing */
		;
	}
}

/*@{*/

/**
 * @brief init idle thread
 *
 * 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, 64);

	/* startup */
	rt_thread_startup(&idle);
}

/**
 * @brief set 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;
}

/*@}*/