/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef PERFETTO_BASE_THREAD_CHECKER_H_
#define PERFETTO_BASE_THREAD_CHECKER_H_

#include <pthread.h>
#include <atomic>

#include "base/logging.h"

namespace perfetto {
namespace base {

class ThreadChecker {
 public:
  ThreadChecker();
  ~ThreadChecker();
  ThreadChecker(const ThreadChecker&);
  ThreadChecker& operator=(const ThreadChecker&);
  bool CalledOnValidThread() const __attribute__((warn_unused_result));
  void DetachFromThread();

 private:
  mutable std::atomic<pthread_t> thread_id_;
};

#if PERFETTO_DCHECK_IS_ON()
#define PERFETTO_THREAD_CHECKER(name) base::ThreadChecker name;
#define PERFETTO_DCHECK_THREAD(name) \
  PERFETTO_DCHECK((name).CalledOnValidThread())
#define PERFETTO_DETACH_FROM_THREAD(name) (name).DetachFromThread()
#else
#define PERFETTO_THREAD_CHECKER(name)
#define PERFETTO_DCHECK_THREAD(name)
#define PERFETTO_DETACH_FROM_THREAD(name)
#endif  // PERFETTO_DCHECK_IS_ON()

}  // namespace base
}  // namespace perfetto

#endif  // PERFETTO_BASE_THREAD_CHECKER_H_