Locker.h

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#ifndef SJEF_LIB_LOCKER_H_
#define SJEF_LIB_LOCKER_H_
#include <filesystem>
#include <map>
#include <mutex>
#include <string>
#include <thread>
namespace fs = std::filesystem;
 
namespace boost::interprocess {
class file_lock; 
}
 
namespace sjef::util {
class Locker {
public:
  explicit Locker(fs::path path);
  virtual ~Locker();
  const fs::path& path() const { return m_path; }
 
  void add_bolt();
  void remove_bolt();
 
private:
  const fs::path m_path;
  std::unique_ptr<std::scoped_lock<std::mutex>> m_lock;
  std::mutex m_mutex;
  int m_bolts = 0;
  const std::unique_ptr<boost::interprocess::file_lock> m_file_lock;
  std::thread::id m_owning_thread;
 
public:
  // RAII
  struct Bolt {
    explicit Bolt(Locker& locker);
    ~Bolt();
    Bolt() = delete;
    Bolt(const Bolt&) = delete;
    Bolt& operator=(const Bolt&) = delete;
 
  private:
    Locker& m_locker;
  };
  Bolt bolt();
};
 
} // namespace sjef::util
#endif // SJEF_LIB_LOCKER_H_