clock.c

来自「一个很简单的操作系统(版本二),是保护模式的编写,让你了解保护模式」· C语言 代码 · 共 36 行

/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                               clock.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                                                    Forrest Yu, 2005
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

#include "type.h"
#include "const.h"
#include "protect.h"
#include "proto.h"
#include "string.h"
#include "proc.h"
#include "global.h"


/*======================================================================*
                           clock_handler
 *======================================================================*/
PUBLIC void clock_handler(int irq)
{
	disp_str("#");

	if (k_reenter != 0) {
		disp_str("!");
		return;
	}

	p_proc_ready++;

	if (p_proc_ready >= proc_table + NR_TASKS) {
		p_proc_ready = proc_table;
	}
}