fifo_w_cb.h

/*******************************************************************************
 * Copyright 2019 MINRES Technologies GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
 
#pragma once
 
#include <deque>
#include <functional>
#include <sysc/communication/sc_prim_channel.h>

namespace scc {
template <typename T> class fifo_w_cb : public sc_core::sc_prim_channel {
public:
    fifo_w_cb()
    : sc_core::sc_prim_channel(sc_core::sc_gen_unique_name("fifo_w_cb")) {}
 
    fifo_w_cb(const char* name)
    : sc_core::sc_prim_channel(name) {}
 
    virtual ~fifo_w_cb(){};
 
    void push_back(T& t) {
        in_queue.push_back(t);
        request_update();
    }
    void push_back(const T& t) {
        in_queue.push_back(t);
        request_update();
    }
 
    void push_back(T&& t) {
        in_queue.emplace_back(std::move(t));
        request_update();
    }
 
    T& back() { return in_queue.back(); }
    const T& back() const { return in_queue.back(); }
 
    void pop_front() {
        out_queue.pop_front();
        request_update();
        if(empty_cb && !out_queue.size())
            empty_cb();
    }
 
    T& front() { return out_queue.front(); }
    const T& front() const { return out_queue.front(); }
 
    T read() {
        wait(data_written_evt);
        auto val = front();
        pop_front();
        return val;
    }
 
    size_t avail() const { return out_queue.size(); }
    bool empty() const { return out_queue.empty(); }
 
    void set_avail_cb(std::function<void(void)> f) { avail_cb = f; }
    void set_empty_cb(std::function<void(void)> f) { empty_cb = f; }
 
    inline sc_core::sc_event const& data_written_event() const { return data_written_evt; }
 
    inline unsigned num_avail() { return available; }
    inline unsigned num_written() { return written; }
 
protected:
    // the update method (does nothing by default)
    virtual void update() {
        written = 0;
        available = out_queue.size();
        if(in_queue.empty())
            return;
        written = in_queue.size();
        out_queue.insert(out_queue.end(), in_queue.begin(), in_queue.end());
        in_queue.clear();
        available = out_queue.size();
        if(avail_cb)
            avail_cb();
        data_written_evt.notify(sc_core::SC_ZERO_TIME);
    }
 
    std::deque<T> in_queue{};
    std::deque<T> out_queue{};
    std::function<void(void)> avail_cb{};
    std::function<void(void)> empty_cb{};
    unsigned available = 0;
    unsigned written = 0;
    sc_core::sc_event data_written_evt{};
};
 
} /* namespace scc */ // end of scc-sysc