forkjoin.cpp

system C源码 一种替代verilog的语言

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

  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2006 by all Contributors.
  All Rights reserved.

  The contents of this file are subject to the restrictions and limitations
  set forth in the SystemC Open Source License Version 2.4 (the "License");
  You may not use this file except in compliance with such restrictions and
  limitations. You may obtain instructions on how to receive a copy of the
  License at http://www.systemc.org/. Software distributed by Contributors
  under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
  ANY KIND, either express or implied. See the License for the specific
  language governing rights and limitations under the License.

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

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

  forkjoin.cpp -- Demo "new" fork/join and dynamic thread
              creation within SystemC 2.1.


  Original Author: Stuart Swan, Cadence Design Systems, Inc., 2002-10-22

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

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

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

      Name, Affiliation, Date: Andy Goodrich, Forte Design Systems, 19 Aug 2003
  Description of Modification: Modified to use 2.1 dynamic process support.

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


#define SC_INCLUDE_DYNAMIC_PROCESSES
#include <systemc.h>


int test_function(double d)
{
  cout << endl << "Test_function sees " << d << endl;
  return int(d);
}

void void_function(double d)
{
  cout << endl << "void_function sees " << d << endl;
}

int ref_function(const double& d)
{
  cout << endl << "ref_function sees " << d << endl;
  return int(d);
}


class top : public sc_module
{
public:
  SC_HAS_PROCESS(top);

  top(sc_module_name name) : sc_module(name) 
  {
     SC_THREAD(main);
  }

  void main()
  {
    int r;
    sc_event e1, e2, e3, e4;

    cout << endl;

    e1.notify(100, SC_NS);

    // Spawn several threads that co-operatively execute in round robin order

    SC_FORK
      sc_spawn(&r,
        sc_bind(&top::round_robin, this, "1", sc_ref(e1), sc_ref(e2), 3), "1") ,
      sc_spawn(&r,
        sc_bind(&top::round_robin, this, "2", sc_ref(e2), sc_ref(e3), 3), "2") ,
      sc_spawn(&r,
        sc_bind(&top::round_robin, this, "3", sc_ref(e3), sc_ref(e4), 3), "3") ,
      sc_spawn(&r,
        sc_bind(&top::round_robin, this, "4", sc_ref(e4), sc_ref(e1), 3), "4") ,
    SC_JOIN

    cout << "Returned int is " << r << endl;
    cout << endl << endl;

    // Test that threads in thread pool are successfully reused ...

    for (int i = 0 ; i < 10; i++)
      sc_spawn(&r, sc_bind(&top::wait_and_end, this, i));

    wait(20, SC_NS);

    // Show how to use sc_spawn_options 

    sc_spawn_options o;
	o.set_stack_size(0);


    // Demo of a function rather than method call, & use return value ...
    
    wait( sc_spawn(&r, sc_bind(&test_function, 3.14159)).terminated_event());

    cout << "Returned int is " << r << endl;

	sc_process_handle handle1 = sc_spawn(sc_bind(&void_function, 1.2345));
	wait(handle1.terminated_event());

    double d = 9.8765;
    wait( sc_spawn(&r, sc_bind(&ref_function, sc_cref(d))).terminated_event() );

    cout << "Returned int is " << r << endl;

    cout << endl << "Done." << endl;
  }

  int round_robin(const char *str, sc_event& receive, sc_event& send, int cnt)
  {
    while (--cnt >= 0)
    {
      wait(receive);
      cout << "Round robin thread " << str <<
                " at time " << sc_time_stamp() << endl;
      wait(10, SC_NS);
      send.notify();
    }

    return 0;
  }

  int wait_and_end(int i)
  {
    wait( i + 1, SC_NS);
    cout << "Thread " << i << " ending." << endl;
    return 0;
  }
};

int sc_main (int argc , char *argv[]) 
{
  top top1("Top1");
  sc_start();

  return 0;
}