sync_point_impl.h

//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).

#include "util/sync_point.h"

#include <assert.h>
#include <atomic>
#include <condition_variable>
#include <functional>
#include <mutex>
#include <string>
#include <thread>
#include <unordered_map>
#include <unordered_set>

#include "port/port.h"
#include "util/random.h"

#pragma once

#ifndef NDEBUG
namespace rocksdb {
struct SyncPoint::Data {
  Data() : enabled_(false) {}
  // Enable proper deletion by subclasses
  virtual ~Data() {}
  // successor/predecessor map loaded from LoadDependency
  std::unordered_map<std::string, std::vector<std::string>> successors_;
  std::unordered_map<std::string, std::vector<std::string>> predecessors_;
  std::unordered_map<std::string, std::function<void(void*)> > callbacks_;
  std::unordered_map<std::string, std::vector<std::string> > markers_;
  std::unordered_map<std::string, std::thread::id> marked_thread_id_;

  std::mutex              mutex_;
  std::condition_variable cv_;
  // sync points that have been passed through
  std::unordered_set<std::string> cleared_points_;
  std::atomic<bool> enabled_;
  int num_callbacks_running_ = 0;

  void LoadDependency(const std::vector<SyncPointPair>& dependencies);
  void LoadDependencyAndMarkers(const std::vector<SyncPointPair>& dependencies,
    const std::vector<SyncPointPair>& markers);
  bool PredecessorsAllCleared(const std::string& point);
  void SetCallBack(const std::string& point,
    const std::function<void(void*)>& callback) {
  std::lock_guard<std::mutex> lock(mutex_);
  callbacks_[point] = callback;
}

  void ClearCallBack(const std::string& point);
  void ClearAllCallBacks();
  void EnableProcessing() {
    enabled_ = true;
  }
  void DisableProcessing() {
    enabled_ = false;
  }
  void ClearTrace() {
    std::lock_guard<std::mutex> lock(mutex_);
    cleared_points_.clear();
  }
  bool DisabledByMarker(const std::string& point,
                        std::thread::id thread_id) {
    auto marked_point_iter = marked_thread_id_.find(point);
    return marked_point_iter != marked_thread_id_.end() &&
           thread_id != marked_point_iter->second;
  }
  void Process(const std::string& point, void* cb_arg);
};
}
#endif // NDEBUG