fixup! erts: Fair handover of code permissions to first waiter

Author: sverker

erts/emulator/test/code_SUITE_data/erts_test_sync_tracer.c

@@ -37,7 +37,7 @@ static ERL_NIF_TERM atom_false;
 
 #define ASSERT(expr) assert(expr)
 
-static ERL_NIF_TERM the_trace_enabled;
+static ethr_atomic_t the_trace_enabled; // ERL_NIF_TERM
 static ethr_atomic_t the_sync; // ERL_NIF_TERM
 
 static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
@@ -49,7 +49,7 @@ static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
     atom_true = enif_make_atom(env, "true");
     atom_false = enif_make_atom(env, "false");
 
-    the_trace_enabled = atom_discard;
+    erts_internal_test.ethr_atomic_init(&the_trace_enabled, atom_discard);
     erts_internal_test.ethr_atomic_init(&the_sync, atom_ok);
 
     *priv_data = NULL;
@@ -92,7 +92,7 @@ static ERL_NIF_TERM enabled(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
     //enif_fprintf(stderr, "erts_test_sync_tracer.enabled(%T, %T, %T)\n",
     //             argv[0], argv[1], argv[2]);
 
-    return the_trace_enabled;
+    return (ERL_NIF_TERM) erts_internal_test.ethr_atomic_read(&the_trace_enabled);
 }
 
 static bool term_to_bool(ERL_NIF_TERM term, bool *res)
@@ -116,7 +116,8 @@ static ERL_NIF_TERM enable_trace(ErlNifEnv* env, int argc, const ERL_NIF_TERM ar
     if (!term_to_bool(argv[0], &is_enabled)) {
         return enif_make_badarg(env);
     }
-    the_trace_enabled = is_enabled ? atom_trace : atom_discard;
+    erts_internal_test.ethr_atomic_set(&the_trace_enabled,
+                                       is_enabled ? atom_trace : atom_discard);
     return atom_ok;
 }