2 * Copyright 2015 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.
18 namespace folly { namespace fibers {
21 * Observes the execution of a task.
23 class ExecutionObserver {
25 virtual ~ExecutionObserver() { }
28 * Called when a task is about to start executing.
30 virtual void starting() noexcept = 0;
33 * Called just after a task stops executing.
35 virtual void stopped() noexcept = 0;
38 }} // namespace folly::fibers