1 /*
2  * Copyright (c) Facebook, Inc. and its affiliates.
3  *
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
7  *
8  *     http://www.apache.org/licenses/LICENSE-2.0
9  *
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.
15  */
16 
17 #include <folly/test/SingletonTestStructs.h>
18 
19 #include <atomic>
20 
21 namespace {
22 // A simple class that tracks how often instances of the class and
23 // subclasses are created, and the ordering.  Also tracks a global
24 // unique counter for each object.
25 std::atomic<size_t> global_counter(19770326);
26 } // namespace
27 
creation_order()28 std::vector<Watchdog*>& Watchdog::creation_order() {
29   static std::vector<Watchdog*> ret;
30   return ret;
31 }
32 
Watchdog()33 Watchdog::Watchdog() : serial_number(++global_counter) {
34   creation_order().push_back(this);
35 }
36