2 * Copyright 2016 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
22 #include <glog/logging.h>
23 #include <gtest/gtest.h>
25 // A simple class that tracks how often instances of the class and
26 // subclasses are created, and the ordering. Also tracks a global
27 // unique counter for each object.
28 std::atomic<size_t> global_counter(19770326);
31 static std::vector<Watchdog*>& creation_order() {
32 static std::vector<Watchdog*> ret;
36 Watchdog() : serial_number(++global_counter) {
37 creation_order().push_back(this);
41 if (creation_order().back() != this) {
42 LOG(FATAL) << "Watchdog destruction order mismatch";
44 creation_order().pop_back();
47 const size_t serial_number;
48 size_t livingWatchdogCount() const { return creation_order().size(); }
50 Watchdog(const Watchdog&) = delete;
51 Watchdog& operator=(const Watchdog&) = delete;
52 Watchdog(Watchdog&&) noexcept = default;
53 Watchdog& operator=(Watchdog&&) noexcept = default;
56 // Some basic types we use for tracking.
57 struct ChildWatchdog : public Watchdog {};
58 struct GlobalWatchdog : public Watchdog {};
59 struct UnregisteredWatchdog : public Watchdog {};