userprog.c

   1 #include <stdio.h>
   2
   3 #include "libthreads.h"
   4 #include "libatomic.h"
   5
   6 static void a(atomic_int *obj)
   7 {
   8         int i;
   9         int ret;
  10
  11         for (i = 0; i < 10; i++) {
  12                 printf("Thread %d, loop %d\n", thrd_current(), i);
  13                 switch (i % 4) {
  14                 case 1:
  15                         ret = atomic_load(obj);
  16                         printf("Read value: %d\n", ret);
  17                         break;
  18                 case 3:
  19                         atomic_store(obj, i);
  20                         printf("Write value: %d\n", i);
  21                         break;
  22                 }
  23         }
  24 }
  25
  26 void user_main()
  27 {
  28         thrd_t t1, t2;
  29         atomic_int obj;
  30
  31         atomic_init(&obj, 0);
  32
  33         printf("Thread %d: creating 2 threads\n", thrd_current());
  34         thrd_create(&t1, (thrd_start_t)&a, &obj);
  35         thrd_create(&t2, (thrd_start_t)&a, &obj);
  36
  37         thrd_join(t1);
  38         thrd_join(t2);
  39         printf("Thread %d is finished\n", thrd_current());
  40 }