FTL: Add thread safety helpers
Bug: 185536303
Test: ftl_test
Change-Id: I0f0550d0608a11b137741cd94248b5bc533a0304
diff --git a/libs/ftl/fake_guard_test.cpp b/libs/ftl/fake_guard_test.cpp
new file mode 100644
index 0000000..9d36e69
--- /dev/null
+++ b/libs/ftl/fake_guard_test.cpp
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <ftl/fake_guard.h>
+#include <gtest/gtest.h>
+
+#include <functional>
+#include <mutex>
+
+namespace android::test {
+
+// Keep in sync with example usage in header file.
+TEST(FakeGuard, Example) {
+ struct {
+ std::mutex mutex;
+ int x FTL_ATTRIBUTE(guarded_by(mutex)) = -1;
+
+ int f() {
+ {
+ ftl::FakeGuard guard(mutex);
+ x = 0;
+ }
+
+ return FTL_FAKE_GUARD(mutex, x + 1);
+ }
+
+ std::function<int()> g() const {
+ return [this]() FTL_FAKE_GUARD(mutex) { return x; };
+ }
+ } s;
+
+ EXPECT_EQ(s.f(), 1);
+ EXPECT_EQ(s.g()(), 0);
+}
+
+} // namespace android::test