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>
24 #include <folly/portability/GTest.h>
26 // A simple class that tracks how often instances of the class and
27 // subclasses are created, and the ordering. Also tracks a global
28 // unique counter for each object.
29 std::atomic<size_t> global_counter(19770326);
32 static std::vector<Watchdog*>& creation_order() {
33 static std::vector<Watchdog*> ret;
37 Watchdog() : serial_number(++global_counter) {
38 creation_order().push_back(this);
42 if (creation_order().back() != this) {
43 LOG(FATAL) << "Watchdog destruction order mismatch";
45 creation_order().pop_back();
48 const size_t serial_number;
49 size_t livingWatchdogCount() const { return creation_order().size(); }
51 Watchdog(const Watchdog&) = delete;
52 Watchdog& operator=(const Watchdog&) = delete;
53 Watchdog(Watchdog&&) noexcept = default;
54 Watchdog& operator=(Watchdog&&) noexcept = default;
57 // Some basic types we use for tracking.
58 struct ChildWatchdog : public Watchdog {};
59 struct GlobalWatchdog : public Watchdog {};
60 struct UnregisteredWatchdog : public Watchdog {};