#include <stdio.h>
#include <stdlib.h>
#include <time.h>

void genschedule ( int n )
{
   int i, j, b, IOmin = 50, CPUmin, CPUmax, IOmod = 151, CPUmod;
   int A = 0;
   FILE *fp;

   fp = (FILE *)fopen("proc.txt", "w");
   fprintf(fp, "%d\n", n);

   for (i=1; i<=n; ++i) {
      fprintf(fp, "%5d %8d", i, A);
      if (rand() % 10) {    /* IO-bound job */
         b = 4 + rand() % 7;
         CPUmin = 1; CPUmax = 15;
      } else {              /* CPU-bound job */
         b = 3 + rand() % 5;
         CPUmin = 100; CPUmax = 300;
      }
      CPUmod = CPUmax - CPUmin + 1;
      for (j=1; j<b; ++j)
         fprintf(fp, " %4d %4d", CPUmin + rand() % CPUmod, IOmin + rand() % IOmod);
      fprintf(fp, " %4d  -1\n", CPUmin + rand() % CPUmod);
      A += rand() % 500;
   }

   fclose(fp);
}

int main ( int argc, char *argv[] )
{
   int n;

   srand((unsigned int)time(NULL));
   n = (argc == 1) ? 100 : atoi(argv[1]);
   genschedule(n);
   exit(0);
}