update name of code to labcodes

2013-09-17 22:21:48 +08:00
parent 759eca9dda
commit 3f8d5876b9
726 changed files with 0 additions and 0 deletions
--- a/labcodes/lab8/user/priority.c
+++ b/labcodes/lab8/user/priority.c
@@ -0,0 +1,80 @@
+#include <ulib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define TOTAL 5
+/* to get enough accuracy, MAX_TIME (the running time of each process) should >1000 mseconds. */
+#define MAX_TIME  2000
+#define SLEEP_TIME 400
+unsigned int acc[TOTAL];
+int status[TOTAL];
+int pids[TOTAL];
+
+static void
+spin_delay(void)
+{
+     int i;
+     volatile int j;
+     for (i = 0; i != 200; ++ i)
+     {
+          j = !j;
+     }
+}
+
+int
+main(void) {
+     int i,time;
+     cprintf("priority process will sleep %d ticks\n",SLEEP_TIME);
+     sleep(SLEEP_TIME);
+     memset(pids, 0, sizeof(pids));
+     lab6_set_priority(TOTAL + 1);
+
+     for (i = 0; i < TOTAL; i ++) {
+          acc[i]=0;
+          if ((pids[i] = fork()) == 0) {
+               lab6_set_priority(i + 1);
+               acc[i] = 0;
+               while (1) {
+                    spin_delay();
+                    ++ acc[i];
+                    if(acc[i]%4000==0) {
+                        if((time=gettime_msec())>MAX_TIME) {
+                            cprintf("child pid %d, acc %d, time %d\n",getpid(),acc[i],time);
+                            exit(acc[i]);
+                        }
+                    }
+               }
+               
+          }
+          if (pids[i] < 0) {
+               goto failed;
+          }
+     }
+
+     cprintf("main: fork ok,now need to wait pids.\n");
+
+     for (i = 0; i < TOTAL; i ++) {
+         status[i]=0;
+         waitpid(pids[i],&status[i]);
+         cprintf("main: pid %d, acc %d, time %d\n",pids[i],status[i],gettime_msec()); 
+     }
+     cprintf("main: wait pids over\n");
+     cprintf("stride sched correct result:");
+     for (i = 0; i < TOTAL; i ++)
+     {
+         cprintf(" %d", (status[i] * 2 / status[0] + 1) / 2);
+     }
+     cprintf("\n");
+
+     return 0;
+
+failed:
+     for (i = 0; i < TOTAL; i ++) {
+          if (pids[i] > 0) {
+               kill(pids[i]);
+          }
+     }
+     panic("FAIL: T.T\n");
+}
+