peq_with_get.h

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// 12-Jan-2009  John Aynsley  Bug fix. sc_time argument to notify should be const
// 20-Mar-2009  John Aynsley  Add cancel_all() method


#ifndef __SYSTEMC_EXT_TLM_UTILS_PEQ_WITH_GET_H__
#define __SYSTEMC_EXT_TLM_UTILS_PEQ_WITH_GET_H__

#include <map>

#include "../core/sc_event.hh"
#include "../core/sc_main.hh"
#include "../core/sc_object.hh"
#include "../core/sc_time.hh"

namespace tlm_utils
{

template <class PAYLOAD>
class peq_with_get : public sc_core::sc_object
{
  public:
    typedef PAYLOAD transaction_type;
    typedef std::pair<const sc_core::sc_time, transaction_type *> pair_type;

  public:
    peq_with_get(const char *name) : sc_core::sc_object(name) {}

    void
    notify(transaction_type &trans, const sc_core::sc_time &t)
    {
        m_scheduled_events.insert(pair_type(t + sc_core::sc_time_stamp(),
                    &trans));
        m_event.notify(t);
    }

    void
    notify(transaction_type &trans)
    {
        m_scheduled_events.insert(pair_type(sc_core::sc_time_stamp(), &trans));
        m_event.notify(); // Immediate notification.
    }

    // Needs to be called until it returns NULL
    transaction_type *
    get_next_transaction()
    {
        if (m_scheduled_events.empty()) {
            return nullptr;
        }

        sc_core::sc_time now = sc_core::sc_time_stamp();
        if (m_scheduled_events.begin()->first <= now) {
            transaction_type *trans = m_scheduled_events.begin()->second;
            m_scheduled_events.erase(m_scheduled_events.begin());
            return trans;
        }

        m_event.notify(m_scheduled_events.begin()->first - now);

        return nullptr;
    }

    sc_core::sc_event &get_event() { return m_event; }

    // Cancel all events from the event queue.
    void
    cancel_all()
    {
        m_scheduled_events.clear();
        m_event.cancel();
    }

  private:
    std::multimap<const sc_core::sc_time, transaction_type *>
        m_scheduled_events;
    sc_core::sc_event m_event;
};

} // namespace tlm_utils

#endif /* __SYSTEMC_EXT_TLM_UTILS_PEQ_WITH_GET_H__ */