sch_demo.h

操作系统实验教程核心技术与编程实例书中地例子代码

#define pcb_count 10
typedef
struct regist
{
   int flag;
   int ax;
   int bx;
   int cx;
   int dx;
   int si;
   int di;
   int bp;
   int ds;
   int es;
   int sp;
   int ss;
   int ip;
   int cs;
}regx;
struct pcb
{
   char name[20];
   int id;
   struct regist rega;
   int priority;
   char status;
   struct pcb far *next;
}pcba[pcb_count];

union  REGS inregs,outregs;
struct SREGS segs;
unsigned old_segment,old_offset;

struct pcb far *ready_head,far *run;
char far *indos;
int dos_ss,dos_sp;
int process_kill_off,process_kill_seg,process_kill_id,to_gsch;
int ss0[2048]={0},ss1[2048]={0},ss2[2048]={0},ss3[2048]={0};
int sys=0;/* 0:sytem state  1: user sate*/
char *name0="gsch";
char *name1="pp1";
char *name2="pp2";
char *name3="pp3";
int time_sch,time_count;
int gsch_off,gsch_seg,sys_ss,sys_sp;
int r_flag,r_ax,r_bx,r_cx,r_dx,r_si,r_di,r_bp,r_ds,r_es,r_sp,r_ss,r_ip,r_cs;
int tt,t1,t2,t3,adpcbreg0,done;