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.
23 * Observes the execution of a task.
25 class ExecutionObserver {
27 virtual ~ExecutionObserver() { }
30 * Called when a task is about to start executing.
32 * @param id Unique id for the task which is starting.
34 virtual void starting(uintptr_t id) noexcept = 0;
37 * Called when a task is ready to run.
39 * @param id Unique id for the task which is ready to run.
41 virtual void runnable(uintptr_t id) noexcept = 0;
44 * Called just after a task stops executing.
46 * @param id Unique id for the task which stopped.
48 virtual void stopped(uintptr_t id) noexcept = 0;