C++ (Cpp) log_mapping Exemples

Exemple #1

Fichier : file_storage.cpp Projet : RojavaCrypto/libbitcoin-database

// Map the database file and signal start.
// Open is not idempotent (should be called on single thread).
bool file_storage::open()
{
    // Critical Section
    ///////////////////////////////////////////////////////////////////////////
    mutex_.lock_upgrade();

    if (!closed_)
    {
        mutex_.unlock_upgrade();
        //---------------------------------------------------------------------
        return false;
    }

    mutex_.unlock_upgrade_and_lock();
    //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    std::string error_name;

    // Initialize data_.
    if (!map(file_size_))
        error_name = "map";
    else if (madvise(data_, 0, MADV_RANDOM) == FAIL)
        error_name = "madvise";
    else
        closed_ = false;

    mutex_.unlock();
    ///////////////////////////////////////////////////////////////////////////

    // Keep logging out of the critical section.
    if (!error_name.empty())
        return handle_error(error_name, filename_);

    log_mapping();
    return true;
}

Exemple #2

Fichier : memory_map.cpp Projet : pmienk/libbitcoin-database

// Map the database file and signal start.
bool memory_map::open()
{
    // Critical Section (internal/unconditional)
    ///////////////////////////////////////////////////////////////////////////
    mutex_.lock_upgrade();

    if (!closed_)
    {
        mutex_.unlock_upgrade();
        //---------------------------------------------------------------------
        // Open is not idempotent (should be called on single thread).
        return false;
    }

    mutex_.unlock_upgrade_and_lock();
    //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    std::string error_name;

    // Initialize data_.
    if (!map(file_size_))
        error_name = "map";
    else if (madvise(data_, 0, MADV_RANDOM) == FAIL)
        error_name = "madvise";
    else
        closed_ = false;

    mutex_.unlock();
    ///////////////////////////////////////////////////////////////////////////

    // Keep logging out of the critical section.
    if (!error_name.empty())
        return handle_error(error_name, filename_);

    log_mapping();
    return true;
}