FileLock.h

// -*- indent-tabs-mode: nil -*-

#ifndef __ARC_FILELOCK_H__
#define __ARC_FILELOCK_H__

#include <string>

#include <arc/Logger.h>

namespace Arc {


  class FileLock {
  public:
    const static int DEFAULT_LOCK_TIMEOUT;
    const static std::string LOCK_SUFFIX;


    FileLock(const std::string& filename,
             unsigned int timeout=DEFAULT_LOCK_TIMEOUT,
             bool use_pid=true);


    bool acquire(bool& lock_removed);


    bool acquire();


    bool release(bool force=false);


    int check(bool log_error = true);

    static std::string getLockSuffix();

  private:
    std::string filename;
    std::string lock_file;
    int timeout;
    bool use_pid;
    std::string pid;
    std::string hostname;
    static Logger logger;

    bool acquire_(bool& lock_removed);

    bool write_pid(int h);
  };

} // namespace Arc

#endif