/* -*- c++ -*- */
/*
 * Copyright 2004,2009,2010,2013 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gnuradio/block.h>
#include <gnuradio/block_detail.h>
#include <gnuradio/block_registry.h>
#include <gnuradio/buffer.h>
#include <gnuradio/logger.h>
#include <gnuradio/prefs.h>
#include <iostream>
#include <stdexcept>

namespace gr {

// Moved from flat_flowgraph.cc
// 32Kbyte buffer size between blocks
#define GR_FIXED_BUFFER_SIZE (32 * (1L << 10))

static const unsigned int s_fixed_buffer_size = GR_FIXED_BUFFER_SIZE;

block::block(const std::string& name,
             io_signature::sptr input_signature,
             io_signature::sptr output_signature)
    : basic_block(name, input_signature, output_signature),
      d_output_multiple(1),
      d_output_multiple_set(false),
      d_unaligned(0),
      d_is_unaligned(false),
      d_relative_rate(1.0),
      d_mp_relative_rate(1.0),
      d_history(1),
      d_attr_delay(0),
      d_fixed_rate(false),
      d_max_noutput_items_set(false),
      d_max_noutput_items(0),
      d_min_noutput_items(0),
      d_tag_propagation_policy(TPP_ALL_TO_ALL),
      d_priority(-1),
      d_pc_rpc_set(false),
      d_update_rate(false),
      d_max_output_buffer(std::max(output_signature->max_streams(), 1), -1),
      d_min_output_buffer(std::max(output_signature->max_streams(), 1), -1),
      d_pmt_done(pmt::intern("done")),
      d_system_port(pmt::intern("system"))
{
    global_block_registry.register_primitive(d_symbol_name, this);
    message_port_register_in(d_system_port);
    set_msg_handler(d_system_port, [this](pmt::pmt_t msg) { this->system_handler(msg); });
}

block::~block() { global_block_registry.unregister_primitive(symbol_name()); }

unsigned block::history() const { return d_history; }

void block::set_history(unsigned history) { d_history = history; }

void block::declare_sample_delay(unsigned delay)
{
    d_attr_delay = delay;
    if (d_detail) {
        unsigned int nins = static_cast<unsigned int>(d_detail->ninputs());
        for (unsigned int n = 0; n < nins; n++) {
            d_detail->input(n)->declare_sample_delay(d_attr_delay);
        }
    }
}

void block::declare_sample_delay(int which, unsigned delay)
{
    d_attr_delay = delay;
    if (d_detail) {
        d_detail->input(which)->declare_sample_delay(d_attr_delay);
    }
}

unsigned block::sample_delay(int which) const { return d_attr_delay; }

// stub implementation:  1:1

void block::forecast(int noutput_items, gr_vector_int& ninput_items_required)
{
    unsigned ninputs = ninput_items_required.size();
    for (unsigned i = 0; i < ninputs; i++)
        ninput_items_required[i] = noutput_items + history() - 1;
}

// default implementation

bool block::start() { return true; }

bool block::stop() { return true; }

void block::set_output_multiple(int multiple)
{
    if (multiple < 1)
        throw std::invalid_argument("block::set_output_multiple");

    d_output_multiple_set = true;
    d_output_multiple = multiple;
}

void block::set_alignment(int multiple)
{
    if (multiple < 1)
        throw std::invalid_argument("block::set_alignment_multiple");

    d_output_multiple = multiple;
}

void block::set_unaligned(int na)
{
    // unaligned value must be less than 0 and it doesn't make sense
    // that it's larger than the alignment value.
    if ((na < 0) || (na > d_output_multiple))
        throw std::invalid_argument("block::set_unaligned");

    d_unaligned = na;
}

void block::set_is_unaligned(bool u) { d_is_unaligned = u; }

void block::set_relative_rate(double relative_rate)
{
    if (relative_rate <= 0.0)
        throw std::invalid_argument(
            "block::set_relative_rate: relative rate must be > 0.0");

    d_relative_rate = relative_rate;
    d_mp_relative_rate = mpq_class(relative_rate);
}

void block::set_inverse_relative_rate(double inverse_relative_rate)
{
    if (inverse_relative_rate <= 0.0)
        throw std::invalid_argument(
            "block::set_inverse_relative_rate: inverse relative rate must be > 0.0");

    mpq_class inv_rr_q(inverse_relative_rate);
    set_relative_rate((uint64_t)inv_rr_q.get_den().get_ui(),
                      (uint64_t)inv_rr_q.get_num().get_ui());
}

void block::set_relative_rate(uint64_t interpolation, uint64_t decimation)
{
    mpz_class interp, decim;
    if (interpolation < 1)
        throw std::invalid_argument(
            "block::set_relative_rate: interpolation rate cannot be 0");

    if (decimation < 1)
        throw std::invalid_argument(
            "block::set_relative_rate: decimation rate cannot be 0");

    mpz_import(interp.get_mpz_t(), 1, 1, sizeof(interpolation), 0, 0, &interpolation);
    mpz_import(decim.get_mpz_t(), 1, 1, sizeof(decimation), 0, 0, &decimation);
    d_mp_relative_rate = mpq_class(interp, decim);
    d_mp_relative_rate.canonicalize();
    d_relative_rate = d_mp_relative_rate.get_d();
}

void block::consume(int which_input, int how_many_items)
{
    d_detail->consume(which_input, how_many_items);
}

void block::consume_each(int how_many_items) { d_detail->consume_each(how_many_items); }

void block::produce(int which_output, int how_many_items)
{
    d_detail->produce(which_output, how_many_items);
}

int block::fixed_rate_ninput_to_noutput(int ninput)
{
    throw std::runtime_error("Unimplemented");
}

int block::fixed_rate_noutput_to_ninput(int noutput)
{
    throw std::runtime_error("Unimplemented");
}

uint64_t block::nitems_read(unsigned int which_input)
{
    if (d_detail) {
        return d_detail->nitems_read(which_input);
    } else {
        // throw std::runtime_error("No block_detail associated with block yet");
        return 0;
    }
}

uint64_t block::nitems_written(unsigned int which_output)
{
    if (d_detail) {
        return d_detail->nitems_written(which_output);
    } else {
        // throw std::runtime_error("No block_detail associated with block yet");
        return 0;
    }
}

void block::add_item_tag(unsigned int which_output, const tag_t& tag)
{
    d_detail->add_item_tag(which_output, tag);
}

void block::remove_item_tag(unsigned int which_input, const tag_t& tag)
{
    d_detail->remove_item_tag(which_input, tag, unique_id());
}

void block::get_tags_in_range(std::vector<tag_t>& v,
                              unsigned int which_input,
                              uint64_t start,
                              uint64_t end)
{
    d_detail->get_tags_in_range(v, which_input, start, end, unique_id());
}

void block::get_tags_in_range(std::vector<tag_t>& v,
                              unsigned int which_input,
                              uint64_t start,
                              uint64_t end,
                              const pmt::pmt_t& key)
{
    d_detail->get_tags_in_range(v, which_input, start, end, key, unique_id());
}

void block::get_tags_in_window(std::vector<tag_t>& v,
                               unsigned int which_input,
                               uint64_t start,
                               uint64_t end)
{
    d_detail->get_tags_in_range(v,
                                which_input,
                                nitems_read(which_input) + start,
                                nitems_read(which_input) + end,
                                unique_id());
}

void block::get_tags_in_window(std::vector<tag_t>& v,
                               unsigned int which_input,
                               uint64_t start,
                               uint64_t end,
                               const pmt::pmt_t& key)
{
    d_detail->get_tags_in_range(v,
                                which_input,
                                nitems_read(which_input) + start,
                                nitems_read(which_input) + end,
                                key,
                                unique_id());
}

block::tag_propagation_policy_t block::tag_propagation_policy()
{
    return d_tag_propagation_policy;
}

void block::set_tag_propagation_policy(tag_propagation_policy_t p)
{
    d_tag_propagation_policy = p;
}

int block::max_noutput_items() { return d_max_noutput_items; }

void block::set_max_noutput_items(int m)
{
    if (m <= 0)
        throw std::runtime_error("block::set_max_noutput_items: value for "
                                 "max_noutput_items must be greater than 0.");

    d_max_noutput_items = m;
    d_max_noutput_items_set = true;
}

void block::unset_max_noutput_items() { d_max_noutput_items_set = false; }

bool block::is_set_max_noutput_items() { return d_max_noutput_items_set; }

void block::set_processor_affinity(const std::vector<int>& mask)
{
    d_affinity = mask;
    if (d_detail) {
        d_detail->set_processor_affinity(d_affinity);
    }
}

void block::unset_processor_affinity()
{
    d_affinity.clear();
    if (d_detail) {
        d_detail->unset_processor_affinity();
    }
}

int block::active_thread_priority()
{
    if (d_detail) {
        return d_detail->thread_priority();
    }
    return -1;
}

int block::thread_priority() { return d_priority; }

int block::set_thread_priority(int priority)
{
    d_priority = priority;
    if (d_detail) {
        return d_detail->set_thread_priority(priority);
    }
    return d_priority;
}

void block::expand_minmax_buffer(int port)
{
    if ((size_t)port >= d_max_output_buffer.size())
        set_max_output_buffer(port, -1);
    if ((size_t)port >= d_min_output_buffer.size())
        set_min_output_buffer(port, -1);
}

long block::max_output_buffer(size_t i)
{
    if (i >= d_max_output_buffer.size())
        throw std::invalid_argument("basic_block::max_output_buffer: port out of range.");
    return d_max_output_buffer[i];
}

void block::set_max_output_buffer(long max_output_buffer)
{
    for (int i = 0; i < output_signature()->max_streams(); i++) {
        set_max_output_buffer(i, max_output_buffer);
    }
}

void block::set_max_output_buffer(int port, long max_output_buffer)
{
    if ((size_t)port >= d_max_output_buffer.size())
        d_max_output_buffer.push_back(max_output_buffer);
    else
        d_max_output_buffer[port] = max_output_buffer;
}

long block::min_output_buffer(size_t i)
{
    if (i >= d_min_output_buffer.size())
        throw std::invalid_argument("basic_block::min_output_buffer: port out of range.");
    return d_min_output_buffer[i];
}

void block::set_min_output_buffer(long min_output_buffer)
{
    d_logger->info(
        "set_min_output_buffer on block {:d} to {:d}", unique_id(), min_output_buffer);
    for (int i = 0; i < output_signature()->max_streams(); i++) {
        set_min_output_buffer(i, min_output_buffer);
    }
}

void block::set_min_output_buffer(int port, long min_output_buffer)
{
    if ((size_t)port >= d_min_output_buffer.size())
        d_min_output_buffer.push_back(min_output_buffer);
    else
        d_min_output_buffer[port] = min_output_buffer;
}

void block::set_blkd_input_timer_value(unsigned int value)
{
    d_blkd_input_timer_value = value;
}

unsigned int block::blkd_input_timer_value() { return d_blkd_input_timer_value; }

void block::allocate_detail(int ninputs,
                            int noutputs,
                            const std::vector<int>& downstream_max_nitems_vec,
                            const std::vector<uint64_t>& downstream_lcm_nitems_vec,
                            const std::vector<uint32_t>& downstream_max_out_mult_vec)
{
    block_detail_sptr detail = make_block_detail(ninputs, noutputs);

    d_debug_logger->debug("Creating block detail for {:s}", identifier());

    for (int i = 0; i < noutputs; i++) {
        expand_minmax_buffer(i);

        buffer_sptr buffer = allocate_buffer(i,
                                             downstream_max_nitems_vec[i],
                                             downstream_lcm_nitems_vec[i],
                                             downstream_max_out_mult_vec[i]);
        d_debug_logger->debug("Allocated buffer for output {:s} {:d}", identifier(), i);
        detail->set_output(i, buffer);

        // Update the block's max_output_buffer based on what was actually allocated.
        if ((max_output_buffer(i) != buffer->bufsize()) && (max_output_buffer(i) != -1))
            d_logger->warn("Block ({:s}) max output buffer set to {:d}"
                           " instead of requested {:d}",
                           alias(),
                           buffer->bufsize(),
                           max_output_buffer(i));
        set_max_output_buffer(i, buffer->bufsize());
    }

    // Store the block_detail that was created above
    set_detail(detail);
}

buffer_sptr
block::replace_buffer(size_t src_port, size_t dst_port, block_sptr block_owner)
{
    block_detail_sptr detail_ = detail();
    buffer_sptr orig_buffer = detail_->output(src_port);

    buffer_type buftype = block_owner->output_signature()->stream_buffer_type(dst_port);

    // Make a new buffer but this time use the passed in block as the owner
    buffer_sptr new_buffer =
        buftype.make_buffer(orig_buffer->bufsize(),
                            orig_buffer->get_sizeof_item(),
                            orig_buffer->get_downstream_lcm_nitems(),
                            orig_buffer->get_max_reader_output_multiple(),
                            shared_from_base<block>(),
                            block_owner);

    detail_->set_output(src_port, new_buffer);
    return new_buffer;
}

bool block::update_rate() const { return d_update_rate; }

void block::enable_update_rate(bool en) { d_update_rate = en; }

buffer_sptr block::allocate_buffer(size_t port,
                                   int downstream_max_nitems,
                                   uint64_t downstream_lcm_nitems,
                                   uint32_t downstream_max_out_mult)
{
    int item_size = output_signature()->sizeof_stream_item(port);

    // *2 because we're now only filling them 1/2 way in order to
    // increase the available parallelism when using the TPB scheduler.
    // (We're double buffering, where we used to single buffer)
    int nitems = s_fixed_buffer_size * 2 / item_size;

    // Make sure there are at least twice the output_multiple no. of items
    if (nitems < 2 * output_multiple()) // Note: this means output_multiple()
        nitems = 2 * output_multiple(); // can't be changed by block dynamically

    // Limit buffer size if indicated
    if (max_output_buffer(port) > 0) {
        // std::cout << "constraining output items to " << block->max_output_buffer(port)
        // << "\n";
        nitems = std::min((long)nitems, (long)max_output_buffer(port));
        nitems -= nitems % output_multiple();
        if (nitems < 1)
            throw std::runtime_error("problems allocating a buffer with the given max "
                                     "output buffer constraint!");
    } else if (min_output_buffer(port) > 0) {
        nitems = std::max((long)nitems, (long)min_output_buffer(port));
        nitems -= nitems % output_multiple();
        if (nitems < 1)
            throw std::runtime_error("problems allocating a buffer with the given min "
                                     "output buffer constraint!");
    }

    // If any downstream blocks are decimators and/or have a large output_multiple,
    // ensure we have a buffer at least twice their decimation factor*output_multiple
    nitems = std::max(nitems, downstream_max_nitems);

    // We're going to let this fail once and retry. If that fails, throw and exit.
    buffer_sptr buf;

#ifdef BUFFER_DEBUG
    d_logger->debug("Block: {:s} allocated buffer for output {:s}", name(), identifier());
#endif

    // Grab the buffer type associated with the output port and use it to
    // create the specified type of buffer
    buffer_type buftype = output_signature()->stream_buffer_type(port);

    try {
#ifdef BUFFER_DEBUG
        std::ostringstream msg;
        msg << "downstream_max_nitems: " << downstream_max_nitems
            << " -- downstream_lcm_nitems: " << downstream_lcm_nitems
            << " -- output_multiple(): " << output_multiple()
            << " -- out_mult_set: " << output_multiple_set() << " -- nitems: " << nitems
            << " -- history: " << history() << " -- relative_rate: " << relative_rate();
        if (relative_rate() != 1.0) {
            msg << " (" << relative_rate_i() << " / " << relative_rate_d() << ")";
        }
        msg << " -- fixed_rate: " << fixed_rate();
        if (fixed_rate()) {
            int num_inputs = fixed_rate_noutput_to_ninput(1) - (history() - 1);
            msg << " (" << num_inputs << " -> "
                << fixed_rate_ninput_to_noutput(num_inputs + (history() - 1)) << ")";
        }
        d_logger->debug(msg.str());
#endif
        buf = buftype.make_buffer(nitems,
                                  item_size,
                                  downstream_lcm_nitems,
                                  downstream_max_out_mult,
                                  shared_from_base<block>(),
                                  shared_from_base<block>());

    } catch (std::bad_alloc&) {
        buf = buftype.make_buffer(nitems,
                                  item_size,
                                  downstream_lcm_nitems,
                                  downstream_max_out_mult,
                                  shared_from_base<block>(),
                                  shared_from_base<block>());
    }

    // Set the max noutput items size here to make sure it's always
    // set in the block and available in the start() method.
    // But don't overwrite if the user has set this externally.
    if (!is_set_max_noutput_items())
        set_max_noutput_items(nitems);

    return buf;
}

float block::pc_noutput_items()
{
    if (d_detail) {
        return d_detail->pc_noutput_items();
    } else {
        return 0;
    }
}

float block::pc_noutput_items_avg()
{
    if (d_detail) {
        return d_detail->pc_noutput_items_avg();
    } else {
        return 0;
    }
}

float block::pc_noutput_items_var()
{
    if (d_detail) {
        return d_detail->pc_noutput_items_var();
    } else {
        return 0;
    }
}

float block::pc_nproduced()
{
    if (d_detail) {
        return d_detail->pc_nproduced();
    } else {
        return 0;
    }
}

float block::pc_nproduced_avg()
{
    if (d_detail) {
        return d_detail->pc_nproduced_avg();
    } else {
        return 0;
    }
}

float block::pc_nproduced_var()
{
    if (d_detail) {
        return d_detail->pc_nproduced_var();
    } else {
        return 0;
    }
}

float block::pc_input_buffers_full(int which)
{
    if (d_detail) {
        return d_detail->pc_input_buffers_full(static_cast<size_t>(which));
    } else {
        return 0;
    }
}

float block::pc_input_buffers_full_avg(int which)
{
    if (d_detail) {
        return d_detail->pc_input_buffers_full_avg(static_cast<size_t>(which));
    } else {
        return 0;
    }
}

float block::pc_input_buffers_full_var(int which)
{
    if (d_detail) {
        return d_detail->pc_input_buffers_full_var(static_cast<size_t>(which));
    } else {
        return 0;
    }
}

std::vector<float> block::pc_input_buffers_full()
{
    if (d_detail) {
        return d_detail->pc_input_buffers_full();
    } else {
        return std::vector<float>(1, 0);
    }
}

std::vector<float> block::pc_input_buffers_full_avg()
{
    if (d_detail) {
        return d_detail->pc_input_buffers_full_avg();
    } else {
        return std::vector<float>(1, 0);
    }
}

std::vector<float> block::pc_input_buffers_full_var()
{
    if (d_detail) {
        return d_detail->pc_input_buffers_full_var();
    } else {
        return std::vector<float>(1, 0);
    }
}

float block::pc_output_buffers_full(int which)
{
    if (d_detail) {
        return d_detail->pc_output_buffers_full(static_cast<size_t>(which));
    } else {
        return 0;
    }
}

float block::pc_output_buffers_full_avg(int which)
{
    if (d_detail) {
        return d_detail->pc_output_buffers_full_avg(static_cast<size_t>(which));
    } else {
        return 0;
    }
}

float block::pc_output_buffers_full_var(int which)
{
    if (d_detail) {
        return d_detail->pc_output_buffers_full_var(static_cast<size_t>(which));
    } else {
        return 0;
    }
}

std::vector<float> block::pc_output_buffers_full()
{
    if (d_detail) {
        return d_detail->pc_output_buffers_full();
    } else {
        return std::vector<float>(1, 0);
    }
}

std::vector<float> block::pc_output_buffers_full_avg()
{
    if (d_detail) {
        return d_detail->pc_output_buffers_full_avg();
    } else {
        return std::vector<float>(1, 0);
    }
}

std::vector<float> block::pc_output_buffers_full_var()
{
    if (d_detail) {
        return d_detail->pc_output_buffers_full_var();
    } else {
        return std::vector<float>(1, 0);
    }
}

float block::pc_work_time()
{
    if (d_detail) {
        return d_detail->pc_work_time();
    } else {
        return 0;
    }
}

float block::pc_work_time_avg()
{
    if (d_detail) {
        return d_detail->pc_work_time_avg();
    } else {
        return 0;
    }
}

float block::pc_work_time_var()
{
    if (d_detail) {
        return d_detail->pc_work_time_var();
    } else {
        return 0;
    }
}

float block::pc_work_time_total()
{
    if (d_detail) {
        return d_detail->pc_work_time_total();
    } else {
        return 0;
    }
}

float block::pc_throughput_avg()
{
    if (d_detail) {
        return d_detail->pc_throughput_avg();
    } else {
        return 0;
    }
}

void block::reset_perf_counters()
{
    if (d_detail) {
        d_detail->reset_perf_counters();
    }
}


void block::system_handler(pmt::pmt_t msg)
{
    // d_logger->info("system handler {:s}", msg);
    pmt::pmt_t op = pmt::car(msg);
    if (pmt::eqv(op, d_pmt_done)) {
        d_finished = pmt::to_long(pmt::cdr(msg));
        global_block_registry.notify_blk(d_symbol_name);
    } else {
        d_logger->warn("bad message op on system port!");
        pmt::print(msg);
    }
}

void block::set_log_level(const std::string& level) { d_logger->set_level(level); }

std::string block::log_level()
{
    std::string level;
    d_logger->get_level(level);
    return level;
}

void block::notify_msg_neighbors()
{
    size_t len = pmt::length(d_message_subscribers);
    pmt::pmt_t port_names = pmt::make_vector(len, pmt::PMT_NIL);
    pmt::pmt_t keys = pmt::dict_keys(d_message_subscribers);
    for (size_t i = 0; i < len; i++) {
        // for each output port
        pmt::pmt_t oport = pmt::nth(i, keys);

        // for each subscriber on this port
        pmt::pmt_t currlist = pmt::dict_ref(d_message_subscribers, oport, pmt::PMT_NIL);

        // iterate through subscribers on port
        while (pmt::is_pair(currlist)) {
            pmt::pmt_t target = pmt::car(currlist);

            pmt::pmt_t block = pmt::car(target);

            currlist = pmt::cdr(currlist);
            basic_block_sptr blk = global_block_registry.block_lookup(block);
            blk->post(d_system_port, pmt::cons(d_pmt_done, pmt::mp(true)));
        }
    }
}

bool block::finished()
{
    if (detail()->ninputs() != 0)
        return false;
    else
        return d_finished;
}


void block::setup_pc_rpc()
{
    d_pc_rpc_set = true;
#if defined(GR_CTRLPORT) && defined(GR_PERFORMANCE_COUNTERS)
#include <gnuradio/rpcregisterhelpers.h>
    d_rpc_vars.emplace_back(
        new rpcbasic_register_trigger<block>(alias(),
                                             "reset_perf_counters",
                                             &block::reset_perf_counters,
                                             "Reset the Performance Counters",
                                             RPC_PRIVLVL_MIN));

    d_rpc_vars.emplace_back(
        new rpcbasic_register_get<block, float>(alias(),
                                                "noutput_items",
                                                &block::pc_noutput_items,
                                                pmt::mp(0),
                                                pmt::mp(32768),
                                                pmt::mp(0),
                                                "",
                                                "noutput items",
                                                RPC_PRIVLVL_MIN,
                                                DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(
        new rpcbasic_register_get<block, float>(alias(),
                                                "avg noutput_items",
                                                &block::pc_noutput_items_avg,
                                                pmt::mp(0),
                                                pmt::mp(32768),
                                                pmt::mp(0),
                                                "",
                                                "Average noutput items",
                                                RPC_PRIVLVL_MIN,
                                                DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(
        new rpcbasic_register_get<block, float>(alias(),
                                                "var noutput_items",
                                                &block::pc_noutput_items_var,
                                                pmt::mp(0),
                                                pmt::mp(32768),
                                                pmt::mp(0),
                                                "",
                                                "Var. noutput items",
                                                RPC_PRIVLVL_MIN,
                                                DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(
        new rpcbasic_register_get<block, float>(alias(),
                                                "nproduced",
                                                &block::pc_nproduced,
                                                pmt::mp(0),
                                                pmt::mp(32768),
                                                pmt::mp(0),
                                                "",
                                                "items produced",
                                                RPC_PRIVLVL_MIN,
                                                DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(
        new rpcbasic_register_get<block, float>(alias(),
                                                "avg nproduced",
                                                &block::pc_nproduced_avg,
                                                pmt::mp(0),
                                                pmt::mp(32768),
                                                pmt::mp(0),
                                                "",
                                                "Average items produced",
                                                RPC_PRIVLVL_MIN,
                                                DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(
        new rpcbasic_register_get<block, float>(alias(),
                                                "var nproduced",
                                                &block::pc_nproduced_var,
                                                pmt::mp(0),
                                                pmt::mp(32768),
                                                pmt::mp(0),
                                                "",
                                                "Var. items produced",
                                                RPC_PRIVLVL_MIN,
                                                DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(
        new rpcbasic_register_get<block, float>(alias(),
                                                "work time",
                                                &block::pc_work_time,
                                                pmt::mp(0),
                                                pmt::mp(1e9),
                                                pmt::mp(0),
                                                "",
                                                "clock cycles in call to work",
                                                RPC_PRIVLVL_MIN,
                                                DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(
        new rpcbasic_register_get<block, float>(alias(),
                                                "avg work time",
                                                &block::pc_work_time_avg,
                                                pmt::mp(0),
                                                pmt::mp(1e9),
                                                pmt::mp(0),
                                                "",
                                                "Average clock cycles in call to work",
                                                RPC_PRIVLVL_MIN,
                                                DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(
        new rpcbasic_register_get<block, float>(alias(),
                                                "var work time",
                                                &block::pc_work_time_var,
                                                pmt::mp(0),
                                                pmt::mp(1e9),
                                                pmt::mp(0),
                                                "",
                                                "Var. clock cycles in call to work",
                                                RPC_PRIVLVL_MIN,
                                                DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(
        new rpcbasic_register_get<block, float>(alias(),
                                                "total work time",
                                                &block::pc_work_time_total,
                                                pmt::mp(0),
                                                pmt::mp(1e9),
                                                pmt::mp(0),
                                                "",
                                                "Total clock cycles in calls to work",
                                                RPC_PRIVLVL_MIN,
                                                DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(new rpcbasic_register_get<block, float>(
        alias(),
        "avg throughput",
        &block::pc_throughput_avg,
        pmt::mp(0),
        pmt::mp(1e9),
        pmt::mp(0),
        "items/s",
        "Average items throughput in call to work",
        RPC_PRIVLVL_MIN,
        DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(new rpcbasic_register_get<block, std::vector<float>>(
        alias(),
        "input \% full",
        &block::pc_input_buffers_full,
        pmt::make_f32vector(0, 0),
        pmt::make_f32vector(0, 1),
        pmt::make_f32vector(0, 0),
        "",
        "how full input buffers are",
        RPC_PRIVLVL_MIN,
        DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(new rpcbasic_register_get<block, std::vector<float>>(
        alias(),
        "avg input \% full",
        &block::pc_input_buffers_full_avg,
        pmt::make_f32vector(0, 0),
        pmt::make_f32vector(0, 1),
        pmt::make_f32vector(0, 0),
        "",
        "Average of how full input buffers are",
        RPC_PRIVLVL_MIN,
        DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(new rpcbasic_register_get<block, std::vector<float>>(
        alias(),
        "var input \% full",
        &block::pc_input_buffers_full_var,
        pmt::make_f32vector(0, 0),
        pmt::make_f32vector(0, 1),
        pmt::make_f32vector(0, 0),
        "",
        "Var. of how full input buffers are",
        RPC_PRIVLVL_MIN,
        DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(new rpcbasic_register_get<block, std::vector<float>>(
        alias(),
        "output \% full",
        &block::pc_output_buffers_full,
        pmt::make_f32vector(0, 0),
        pmt::make_f32vector(0, 1),
        pmt::make_f32vector(0, 0),
        "",
        "how full output buffers are",
        RPC_PRIVLVL_MIN,
        DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(new rpcbasic_register_get<block, std::vector<float>>(
        alias(),
        "avg output \% full",
        &block::pc_output_buffers_full_avg,
        pmt::make_f32vector(0, 0),
        pmt::make_f32vector(0, 1),
        pmt::make_f32vector(0, 0),
        "",
        "Average of how full output buffers are",
        RPC_PRIVLVL_MIN,
        DISPTIME | DISPOPTSTRIP));

    d_rpc_vars.emplace_back(new rpcbasic_register_get<block, std::vector<float>>(
        alias(),
        "var output \% full",
        &block::pc_output_buffers_full_var,
        pmt::make_f32vector(0, 0),
        pmt::make_f32vector(0, 1),
        pmt::make_f32vector(0, 0),
        "",
        "Var. of how full output buffers are",
        RPC_PRIVLVL_MIN,
        DISPTIME | DISPOPTSTRIP));
#endif /* defined(GR_CTRLPORT) && defined(GR_PERFORMANCE_COUNTERS) */
}

std::string block::identifier() const
{
    return d_name + "(" + std::to_string(d_unique_id) + ")";
}

std::ostream& operator<<(std::ostream& os, const block* m)
{
    os << "<block " << m->identifier() << ">";
    return os;
}

int block::general_work(int noutput_items,
                        gr_vector_int& ninput_items,
                        gr_vector_const_void_star& input_items,
                        gr_vector_void_star& output_items)
{
    throw std::runtime_error("block::general_work() not implemented");
    return 0;
}

} /* namespace gr */
