xref: /gem5/src/systemc/tests/systemc/1666-2011-compliance/old_event_bug/old_event_bug.cpp

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// old_event_bug.cpp -- test for
//
//  Original Author: John Aynsley, Doulos, Inc.
//
// MODIFICATION LOG - modifiers, enter your name, affiliation, date and
//
// $Log: old_event_bug.cpp,v $
// Revision 1.2  2011/05/08 19:18:46  acg
//  Andy Goodrich: remove extraneous + prefixes from git diff.
//

// Longstanding bug when checking for events in signals

#define SC_INCLUDE_DYNAMIC_PROCESSES

#include <systemc>

using namespace sc_core;
using std::cout;
using std::endl;

struct Top: sc_module
{
  Top(sc_module_name _name)
  : counti(0)
  , countb(0)
  , reached_the_end(false)
  {
    SC_THREAD(T);

    SC_METHOD(MI);
      sensitive << sigi;
      dont_initialize();

    SC_METHOD(MB);
      sensitive << sigb;
      dont_initialize();

    sigi.write(0);
    sigb.write(false);
    sigi_dummy.write(0);
    sigb_dummy.write(false);
  }

  int counti;
  int countb;
  bool reached_the_end;

  sc_signal<int>  sigi;
  sc_signal<bool> sigb;

  sc_signal<int>  sigi_dummy;
  sc_signal<bool> sigb_dummy;

  void T()
  {
    sc_assert( sigi.event() == false );
    sc_assert( sigb.event() == false );
    sc_assert( sigb.posedge() == false );
    sc_assert( sigb.negedge() == false );

    sigi.write(1);
    wait(sigi.value_changed_event());
    sc_assert( sigi.event() );

    sigb.write(true);
    wait(sigb.value_changed_event());
    sc_assert( sigb.event() );
    sc_assert( sigb.posedge() );
    sc_assert( sigb.negedge() == false );

    wait(1, SC_NS);

    sc_assert( sigi.event() == false );
    sc_assert( sigb.event() == false );

    sigi.write(2);
    sigb.write(false);

    wait(1, SC_NS);

    sc_assert( sigi.event() == false );
    sc_assert( sigb.event() == false );
    sc_assert( sigb.posedge() == false );
    sc_assert( sigb.negedge() == false );

    sigi_dummy.write(1);
    sigb_dummy.write(true);

    wait(1, SC_NS);

    sc_assert( sigi_dummy.event() == false );
    sc_assert( sigb_dummy.event() == false );
    sc_assert( sigb_dummy.posedge() == false );
    sc_assert( sigb_dummy.negedge() == false );

    reached_the_end = true;
  }

  void MI()
  {
    sc_assert( sigi.event() );
    ++counti;
  }

  void MB()
  {
    sc_assert( sigb.event() );
    ++countb;
  }

  SC_HAS_PROCESS(Top);
};

int sc_main(int argc, char* argv[])
{
  Top top("top");

  sc_start();

  sc_assert( top.counti == 2 );
  sc_assert( top.countb == 2 );
  sc_assert( top.reached_the_end );

  cout << endl << "Success" << endl;
  return 0;
}