userprog.c

   1 #include <stdio.h>
   2
   3 #include "libthreads.h"
   4 #include "libatomic.h"
   5 #include "librace.h"
   6
   7 static void a(atomic_int *obj)
   8 {
   9         int i;
  10         int ret;
  11
  12         store_32(&i, 10);
  13         printf("load 32 yields: %d\n", load_32(&i));
  14
  15         for (i = 0; i < 2; i++) {
  16                 printf("Thread %d, loop %d\n", thrd_current(), i);
  17                 switch (i % 2) {
  18                 case 1:
  19                         ret = atomic_load(obj);
  20                         printf("Read value: %d\n", ret);
  21                         break;
  22                 case 0:
  23                         atomic_store(obj, i + 1);
  24                         printf("Write value: %d\n", i + 1);
  25                         break;
  26                 }
  27         }
  28 }
  29
  30 void user_main()
  31 {
  32         thrd_t t1, t2;
  33         atomic_int obj;
  34
  35         atomic_init(&obj, 0);
  36
  37         printf("Thread %d: creating 2 threads\n", thrd_current());
  38         thrd_create(&t1, (thrd_start_t)&a, &obj);
  39         thrd_create(&t2, (thrd_start_t)&a, &obj);
  40
  41         thrd_join(t1);
  42         thrd_join(t2);
  43         printf("Thread %d is finished\n", thrd_current());
  44 }