Method UnlockFile

src/leveldb/util/env_posix.cc:665–674

  }

  Status UnlockFile(FileLock* lock) override {
    PosixFileLock* posix_file_lock = static_cast<PosixFileLock*>(lock);
    if (LockOrUnlock(posix_file_lock->fd(), false) == -1) {
      return PosixError("unlock " + posix_file_lock->filename(), errno);
    }
    locks_.Remove(posix_file_lock->filename());
    ::close(posix_file_lock->fd());
    delete posix_file_lock;
    return Status::OK();
  }

  void Schedule(void (*background_work_function)(void* background_work_arg),
                void* background_work_arg) override;