/*
 * SharedData.hh
 *
 *  Created on: 5 апр. 2021 г.
 *      Author: titov
 */

#ifndef UMLIBRARY_SYSTEMIC_SHAREDDATA_HH_
#define UMLIBRARY_SYSTEMIC_SHAREDDATA_HH_

#include "../peripheral/ProtectedMemory.hh"

#include <utility>

namespace systemic {

struct SharedData {

    std::pair<peripheral::protected_char *, std::size_t> get() const;

    // exclusive ownership
    void lock();                // blocking
    bool try_lock();
    void unlock();

    // shared ownership
    void lock_shared();         // blocking
    bool try_lock_shared();
    void unlock_shared();

    SharedData();
    SharedData( std::pair<peripheral::protected_char *, std::size_t> data );
    SharedData( peripheral::protected_char * buff, std::size_t size );
    SharedData( const SharedData & );
    SharedData & operator=( SharedData data );
    ~SharedData();

    SharedData part( peripheral::protected_char * buff, std::size_t size );


private:
    std::pair<peripheral::protected_char *, std::size_t> data;
};

struct ProtectedDataView {

    std::pair<const peripheral::protected_char *, std::size_t> get() const;

    // shared ownership
    void lock_shared();         // blocking
    bool try_lock_shared();
    void unlock_shared();

    ProtectedDataView();
    ProtectedDataView( std::pair<const peripheral::protected_char *, std::size_t> data );
    ProtectedDataView( const peripheral::protected_char * buff, std::size_t size );
    ProtectedDataView( const ProtectedDataView & );
    ProtectedDataView & operator=( ProtectedDataView data );
    ~ProtectedDataView();

    ProtectedDataView part( const peripheral::protected_char * buff, std::size_t size );


private:
    std::pair<const peripheral::protected_char *, std::size_t> data;
};

}

#endif /* UMLIBRARY_SYSTEMIC_SHAREDDATA_HH_ */