/*                     Threads example        S. Murrell,         11-11-99

      first downloading threads.h and threads.c, and this example test.c
      compile and run them like this:
                           cc -c threads.c
                           cc -c test.c
                           cc -pthread threads.o test.o
                           ./a.out
      When you write your own thread-using program in C++, you
      must use CC (capitals, not cc), but cc and CC should not
      be mixed, so you will need to recompile the library too:
                           CC -c threads.c
                           CC -c hw4.cpp
                           CC -pthread threads.o test.o
                           ./a.out

      these instructions are designed for rabbit.
      Other computers will probably differ.
*/

#include <stdio.h>
#include "threads.h"

semaphore s;

int total=0;

void activity(int c)
{ int i;
  for (i=10; i>=0; i-=1)
  { usleep(random_in_range(100000,2000000));
    grab(s);
    total+=1;
    release(s);
    printf("<%c%d>\n",c,i); } }

void main(void)
{ int t1, t2;
  srandomdev();
  s=create_semaphore();
  t1=start_thread(activity, 'X');
  t2=start_thread(activity, 'Y');
  printf("main waiting\n");
  usleep(random_in_range(2500000,5000000));
  printf("main awake!\n");
  wait_for_exit(t1);
  wait_for_exit(t2);
  printf("end, total=%d\n",total); }