ChipSelectManager.hpp

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/*
 * This file is part of the DUDS project. It is subject to the BSD-style
 * license terms in the LICENSE file found in the top-level directory of this
 * distribution and at https://github.com/jjackowski/duds/blob/master/LICENSE.
 * No part of DUDS, including this file, may be copied, modified, propagated,
 * or distributed except according to the terms contained in the LICENSE file.
 *
 * Copyright (C) 2017  Jeff Jackowski
 */
#ifndef CHIPSELECTMANAGER_HPP
#define CHIPSELECTMANAGER_HPP

#include <mutex>
#include <condition_variable>
#include <memory>
#include <boost/noncopyable.hpp>

namespace duds { namespace hardware { namespace interface {

class ChipAccess;

class ChipSelectManager : boost::noncopyable,
public std::enable_shared_from_this<ChipSelectManager> {
    friend class ChipAccess;
protected:
    std::mutex block;
private:
    std::condition_variable selwait;
    ChipAccess *curacc;
    int waiting;
    void retire(ChipAccess *ca);
protected:
    int cid;
    virtual void select() = 0;
    virtual void deselect() = 0;
    void changeChip(int chipId);
    void baseAccess(std::unique_lock<std::mutex> &lock, int chipId);
    void shutdown();
public:
    ChipSelectManager();
    virtual ~ChipSelectManager() = 0;
    bool inUse() const {
        return curacc;
    }
    virtual bool validChip(int chipId) const noexcept = 0;
    std::unique_ptr<ChipAccess> access(int chipId);
    void access(ChipAccess &acc, int chipId);
    std::unique_ptr<ChipAccess> select(int chipId);
    void select(ChipAccess &acc, int chipId);
};

} } }
#endif        //  #ifndef CHIPSELECTMANAGER_HPP