Safe and efficient stack-limit based interrupt checking in C++.

runtime/vm/atomic_test.cc

Index: runtime/vm/atomic_test.cc
diff --git a/runtime/vm/atomic_test.cc b/runtime/vm/atomic_test.cc
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+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "platform/assert.h"
+#include "platform/utils.h"
+#include "vm/atomic.h"
+#include "vm/globals.h"
+#include "vm/unit_test.h"
+
+namespace dart {
+
+UNIT_TEST_CASE(FetchAndIncrement) {
+  uintptr_t v = 42;
+  EXPECT_EQ(42, AtomicOperations::FetchAndIncrement(&v));
+  EXPECT_EQ(43, v);
+}
+
+
+UNIT_TEST_CASE(FetchAndAdd) {
+  intptr_t v = 42;
+  EXPECT_EQ(42, AtomicOperations::FetchAndAdd(&v, 0));
+  EXPECT_EQ(42, v);
+  EXPECT_EQ(42, AtomicOperations::FetchAndAdd(&v, 2));
+  EXPECT_EQ(44, v);
+  EXPECT_EQ(44, AtomicOperations::FetchAndAdd(&v, -2));
+  EXPECT_EQ(42, v);
+}
+
+
+UNIT_TEST_CASE(LoadRelaxed) {
+  uword v = 42;
+  EXPECT_EQ(42, AtomicOperations::LoadRelaxed(&v));
+}
+
+}  // namespace dart