src/systemc/tests/systemc/communication/sc_signal/check_writer/test15/test15.cpp

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  with this work for additional information regarding copyright ownership.
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/*****************************************************************************

  test15.cpp -- sc_writer_policy: check conflicts within an evaluation phase

  Original Author: Philipp A. Hartmann, Intel, 2017-05-12

 *****************************************************************************/

// see https://github.com/OSCI-WG/systemc/issues/222

#define SC_INCLUDE_DYNAMIC_PROCESSES
#include <systemc>
#include <iomanip>
#include <sstream>

using sc_core::SC_NS;
using sc_core::SC_ZERO_TIME;

SC_MODULE(dut)
{
    static const int num_drivers = 4;

    SC_CTOR(dut)
      : sig("sig")
    {
        SC_THREAD(run);
        for(int id=1; id <= num_drivers; ++id) {
          // first and last driver write the same values
          spawn_driver( id, (id-1) % (num_drivers-1) + 1 );
        }
    }

private:
    void spawn_driver(int id, int value) {
      sc_assert( id > 0 && id <= num_drivers );
      sc_core::sc_spawn_options sp;
      sp.set_sensitivity(&ev[id-1]);
      sp.spawn_method();
      sp.dont_initialize();

      std::stringstream nm;
      nm << "p" << id;
      sc_spawn( sc_bind(&dut::driver, this, value), nm.str().c_str(), &sp );
    }

    void run() {
      wait(1, SC_NS);

      std::cout << "\n*** trigger each driver in individual delta cycles" << std::endl;
      for(int id=1; id <= num_drivers; ++id) {
        trigger(id);
        wait(SC_ZERO_TIME);
        log();
      }

      wait(1, SC_NS);
      std::cout << "\n*** trigger 1-2-3 in the same delta cycle" << std::endl;
      trigger(1);
      trigger(2); // error expected
      trigger(3); // error expected
      wait(SC_ZERO_TIME);
      log();

      wait(1, SC_NS);
      std::cout << "\n*** trigger 2-3-1 in the same delta cycle" << std::endl;
      trigger(2);
      trigger(3); // error expected
      trigger(1); // error expected
      wait(SC_ZERO_TIME);
      log();

      wait(1, SC_NS);
      std::cout << "\n*** trigger 3-1-2 in the same delta cycle" << std::endl;
      trigger(3);
      trigger(1); // error expected
      trigger(2); // error expected
      wait(SC_ZERO_TIME);
      log();

      wait(1, SC_NS);
      std::cout << "\n*** trigger 1-2-1-2 in the same delta cycle" << std::endl;
      trigger(1);
      trigger(2); // error expected
      trigger(1); // NO error expected (original process)
      trigger(2); // error expected
      wait(SC_ZERO_TIME);
      log();

      wait(1, SC_NS);
      std::cout << "\n*** trigger 2-1 in the same delta cycle" << std::endl;
      trigger(2);
      trigger(1); // error expected
      wait(SC_ZERO_TIME);
      log();

      wait(1, SC_NS);
      std::cout << "\n*** trigger 1-3 in the same delta cycle" << std::endl;
      trigger(1);
      trigger(3); // error expected
      wait(SC_ZERO_TIME);
      log();

      wait(1, SC_NS);
      std::cout << "\n*** trigger 1-4-1 in the same delta cycle" << std::endl;
      trigger(1);
      trigger(4); // error expected? (same value)
      trigger(1); // NO error expected (original process)
      wait(SC_ZERO_TIME);
      log();

      wait(1, SC_NS);
      std::cout << "\n*** trigger 4-1 in the same delta cycle" << std::endl;
      trigger(4);
      trigger(1); // error expected? (same value)
      wait(SC_ZERO_TIME);
      log();
    }

    void trigger(int id) {
      sc_assert( id > 0 && id <= num_drivers );
      ev[id-1].notify();
      wait(ev_schedule);
    }

    void driver(int value) {
        log(value);
        try {
            sig.write(value);
        } catch (const sc_core::sc_report& msg ) {
            std::cout << "\n" << msg.what() << "\n" << std::endl;
        }
        ev_schedule.notify();
    }

    void log(int value = -1) {
        std::cout
          << std::setw(8) << sc_core::sc_get_current_process_handle().name() << ": "
          << std::setw(5) << sc_core::sc_time_stamp()
          << " @ " << std::setw(2) << sc_core::sc_delta_count() << ": "
          << ( (value!=-1) ? "writing " : "reading " )
          << sig.name() << " = "
          << ( (value!=-1) ? value : sig.read() )
          << std::endl;
    }

    sc_core::sc_signal<int, sc_core::SC_MANY_WRITERS> sig;
    sc_core::sc_event ev_schedule, ev[num_drivers];
};

int sc_main( int, char*[] )
{
    dut top("dut");
    sc_core::sc_start();
    std::cout << "\nProgram completed" << std::endl;
    return 0;
}