test/releaseseq.c

   1 /*
   2  * This test performs some relaxes, release, acquire opeations on a single
   3  * atomic variable. It can give some rough idea of release sequence support but
   4  * probably should be improved to give better information.
   5  */
   6
   7 #include <stdio.h>
   8
   9 #include "libthreads.h"
  10 #include "librace.h"
  11 #include "stdatomic.h"
  12
  13 atomic_int x;
  14
  15 static void a(void *obj)
  16 {
  17         atomic_store_explicit(&x, 1, memory_order_release);
  18         atomic_store_explicit(&x, 42, memory_order_relaxed);
  19 }
  20
  21 static void b(void *obj)
  22 {
  23         int r = atomic_load_explicit(&x, memory_order_acquire);
  24         printf("r = %u\n", r);
  25 }
  26
  27 static void c(void *obj)
  28 {
  29         atomic_store_explicit(&x, 2, memory_order_relaxed);
  30 }
  31
  32 void user_main()
  33 {
  34         thrd_t t1, t2, t3;
  35
  36         atomic_init(&x, 0);
  37
  38         printf("Thread %d: creating 3 threads\n", thrd_current());
  39         thrd_create(&t1, (thrd_start_t)&a, NULL);
  40         thrd_create(&t2, (thrd_start_t)&b, NULL);
  41         thrd_create(&t3, (thrd_start_t)&c, NULL);
  42
  43         thrd_join(t1);
  44         thrd_join(t2);
  45         thrd_join(t3);
  46         printf("Thread %d is finished\n", thrd_current());
  47 }