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80 строки
1.9 KiB
80 строки
1.9 KiB
#include <ulib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#define TOTAL 5
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/* to get enough accuracy, MAX_TIME (the running time of each process) should >1000 mseconds. */
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#define MAX_TIME 2000
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#define SLEEP_TIME 400
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unsigned int acc[TOTAL];
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int status[TOTAL];
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int pids[TOTAL];
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static void
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spin_delay(void)
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{
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int i;
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volatile int j;
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for (i = 0; i != 200; ++ i)
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{
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j = !j;
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}
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}
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int
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main(void) {
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int i,time;
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cprintf("priority process will sleep %d ticks\n",SLEEP_TIME);
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sleep(SLEEP_TIME);
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memset(pids, 0, sizeof(pids));
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lab6_set_priority(TOTAL + 1);
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for (i = 0; i < TOTAL; i ++) {
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acc[i]=0;
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if ((pids[i] = fork()) == 0) {
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lab6_set_priority(i + 1);
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acc[i] = 0;
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while (1) {
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spin_delay();
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++ acc[i];
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if(acc[i]%4000==0) {
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if((time=gettime_msec())>MAX_TIME) {
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cprintf("child pid %d, acc %d, time %d\n",getpid(),acc[i],time);
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exit(acc[i]);
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}
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}
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}
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}
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if (pids[i] < 0) {
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goto failed;
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}
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}
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cprintf("main: fork ok,now need to wait pids.\n");
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for (i = 0; i < TOTAL; i ++) {
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status[i]=0;
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waitpid(pids[i],&status[i]);
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cprintf("main: pid %d, acc %d, time %d\n",pids[i],status[i],gettime_msec());
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}
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cprintf("main: wait pids over\n");
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cprintf("stride sched correct result:");
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for (i = 0; i < TOTAL; i ++)
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{
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cprintf(" %d", (status[i] * 2 / status[0] + 1) / 2);
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}
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cprintf("\n");
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return 0;
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failed:
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for (i = 0; i < TOTAL; i ++) {
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if (pids[i] > 0) {
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kill(pids[i]);
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}
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}
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panic("FAIL: T.T\n");
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}
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