test/fences2.c

   1 #include <stdio.h>
   2 #include <threads.h>
   3 #include <stdatomic.h>
   4
   5 #include "librace.h"
   6 #include "model-assert.h"
   7
   8 atomic_int x;
   9 atomic_int y;
  10
  11 static void a(void *obj)
  12 {
  13         atomic_store_explicit(&x, 1, memory_order_relaxed);
  14         atomic_thread_fence(memory_order_release);
  15         atomic_store_explicit(&x, 2, memory_order_relaxed);
  16 }
  17
  18 static void b(void *obj)
  19 {
  20         int r1, r2;
  21         r1 = atomic_load_explicit(&x, memory_order_relaxed);
  22         atomic_thread_fence(memory_order_acquire);
  23         r2 = atomic_load_explicit(&x, memory_order_relaxed);
  24
  25         printf("FENCES: r1 = %d, r2 = %d\n", r1, r2);
  26         if (r1 == 2)
  27                 MODEL_ASSERT(r2 != 1);
  28 }
  29
  30 int user_main(int argc, char **argv)
  31 {
  32         thrd_t t1, t2;
  33
  34         atomic_init(&x, 0);
  35         atomic_init(&y, 0);
  36
  37         printf("Main thread: creating 2 threads\n");
  38         thrd_create(&t1, (thrd_start_t)&a, NULL);
  39         thrd_create(&t2, (thrd_start_t)&b, NULL);
  40
  41         thrd_join(t1);
  42         thrd_join(t2);
  43         printf("Main thread is finishing\n");
  44
  45         return 0;
  46 }