clock.c

来自「自己动手写操作系统的光盘资料,是学习操作系统的很好资料」· C语言 代码 · 共 48 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("#");
	ticks++;

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

	p_proc_ready++;

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

/*======================================================================*
                              milli_delay
 *======================================================================*/
PUBLIC void milli_delay(int milli_sec)
{
	int t = get_ticks();

	while(((get_ticks() - t) * 1000 / HZ) < milli_sec) {}
}