test/litmus/seq-lock.cc

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <threads.h>
   4 #include <atomic>
   5
   6 std::atomic_int x;
   7 std::atomic_int y;
   8 std::atomic_int z;
   9
  10 static int N = 1;
  11
  12 static void a(void *obj)
  13 {
  14         for (int i = 0; i < N; i++) {
  15                 x.store(2 * i + 1, std::memory_order_release);
  16                 y.store(i + 1, std::memory_order_release);
  17                 z.store(i + 1, std::memory_order_release);
  18                 x.store(2 * i + 2, std::memory_order_release);
  19         }
  20 }
  21
  22 static void b(void *obj)
  23 {
  24         printf("x: %d\n", x.load(std::memory_order_acquire));
  25         printf("y: %d\n", y.load(std::memory_order_acquire));
  26         printf("z: %d\n", z.load(std::memory_order_acquire));
  27         printf("x: %d\n", x.load(std::memory_order_acquire));
  28 }
  29
  30 int user_main(int argc, char **argv)
  31 {
  32         thrd_t t1, t2;
  33
  34         if (argc > 1)
  35                 N = atoi(argv[1]);
  36
  37         printf("N: %d\n", N);
  38
  39         atomic_init(&x, 0);
  40         atomic_init(&y, 0);
  41         atomic_init(&z, 0);
  42
  43         printf("Main thread: creating 2 threads\n");
  44         thrd_create(&t1, (thrd_start_t)&a, NULL);
  45         thrd_create(&t2, (thrd_start_t)&b, NULL);
  46
  47         thrd_join(t1);
  48         thrd_join(t2);
  49         printf("Main thread is finished\n");
  50
  51         return 0;
  52 }