sc_spawn.h

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  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");
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/*****************************************************************************

  sc_spawn.h -- Process spawning support.

  Original Authors: Andy Goodrich, Forte Design Systems, 17 June 2003
                    Stuart Swan, Cadence,
                    Bishnupriya Bhattacharya, Cadence Design Systems,
                    25 August, 2003

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

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

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

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  Description of Modification:

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// $Log: sc_spawn.h,v $
// Revision 1.1.1.1  2006/12/15 20:31:37  acg
// SystemC 2.2
//
// Revision 1.4  2006/04/11 23:13:21  acg
//   Andy Goodrich: Changes for reduced reset support that only includes
//   sc_cthread, but has preliminary hooks for expanding to method and thread
//   processes also.
//
// Revision 1.3  2006/01/13 18:44:30  acg
// Added $Log to record CVS changes into the source.
//

#if !defined(sc_spawn_h_INCLUDED)
#define sc_spawn_h_INCLUDED

#include "sysc/kernel/sc_process_handle.h"
#include "sysc/kernel/sc_spawn_options.h"

namespace sc_core {

class sc_event;
class sc_port_base;
class sc_interface;
class sc_event_finder;
class sc_process_b;

//=============================================================================
// CLASS sc_spawn_object<T>
//
// This templated helper class allows an object to provide the execution 
// semantics for a process via its () operator. An instance of the supplied 
// execution object will be kept to provide the semantics when the process is 
// scheduled for execution. The () operator does not return a value. An example 
// of an object that might be used for this helper function would be void BOOST 
// bound function or method. 
//
// This class is derived from sc_process_host and overloads 
// sc_process_host::semantics to provide the actual semantic content. 
//
//   sc_spawn_object(T object, const char* name, const sc_spawn_options* opt_p)
//     This is the object instance constructor for this class. It makes a
//     copy of the supplied object. The tp_call constructor is called
//     with an indication that this object instance should be reclaimed when
//     execution completes.
//         object   =  object whose () operator will be called to provide
//                     the process semantics.
//         name_p   =  optional name for object instance, or zero.
//         opt_p    -> spawn options or zero.
//
//   virtual void semantics()
//     This virtual method provides the execution semantics for its process.
//     It performs a () operation on m_object.
//=============================================================================
template<typename T>
class sc_spawn_object : public sc_process_host {
  public:
    sc_spawn_object( T object) : m_object(object)
    {
    }

    virtual void semantics()
    {
        m_object();
    }

  protected:
    T                        m_object;
};


//------------------------------------------------------------------------------
//"sc_spawn - semantic object with no return value"
//
// This inline function spawns a process for execution. The execution semantics 
// for the process being spawned will be provided by the supplied object 
// instance via its () operator. (E.g., a BOOST bound function) 
// After creating the process it is registered with the simulator.
//     object   =   object instance providing the execution semantics via its 
//                  () operator.
//     name_p   =   optional name for object instance, or zero.
//     opt_p    ->  optional spawn options for process, or zero for the default.
//------------------------------------------------------------------------------
template <typename T>
inline sc_process_handle sc_spawn( 
    T object, 
    const char* name_p = 0,
    const sc_spawn_options* opt_p = 0)
{
    sc_simcontext*      context_p;
    sc_spawn_object<T>* spawn_p;
    
    context_p = sc_get_curr_simcontext();
    spawn_p = new sc_spawn_object<T>(object);
    if ( !opt_p || !opt_p->is_method() )
    {
            sc_process_handle thread_handle = context_p->create_thread_process( 
            name_p, true,
            SC_MAKE_FUNC_PTR(sc_spawn_object<T>,semantics), 
            spawn_p, opt_p 
        );
        return thread_handle;
    }
    else
    {
            sc_process_handle method_handle = context_p->create_method_process( 
            name_p, true,
            SC_MAKE_FUNC_PTR(sc_spawn_object<T>,semantics), 
            spawn_p, opt_p 
        );
        return method_handle;
    }
}

//=============================================================================
// CLASS sc_spawn_object_v<T> for all compilers except HP aCC
//              or
// CLASS sc_spawn_object_v<T, R> for HP aCC which tries to match this 
// one template argument class when the sc_spawn() declared above is
// invoked with 3 arguments or 2 arguments, and generates compiler errors.
//
// This templated helper class allows an object to provide the execution 
// semantics for a process via its () operator. An instance of the supplied 
// object will be kept to provide the semantics when the process is scheduled 
// for execution. The () operator returns a value, which will be stored at the 
// location specified by the supplied pointer. An example of an object that 
// might be used for this helper function would be valued BOOST bound function 
// or method. 
//
//   sc_spawn_object_v( typename F::result_type* r_p, T f, const char* name_p,
//                      const sc_spawn_options* opt_p )
//       r_p      -> where to place the result of the function invocation.
//       f        =  information to be executed.
//       name_p   =  optional name for object instance, or zero.
//       opt_p    -> optional spawn options for process, or zero for the default
//     This is the object instance constructor for this class. It makes a
//     copy of the supplied object. The tp_call constructor is called
//     with an indication that this object instance should be reclaimed when
//     execution completes.
//         result_p -> where to place the value of the () operator.
//         object   =  object whose () operator will be called to provide
//                     the process semantics.
//
//   virtual void semantics()
//     This virtual method provides the execution semantics for its process.
//     It performs a () operation on m_object, placing the result at m_result_p.
//=============================================================================

//------------------------------------------------------------------------------
//"sc_spawn_object_v - semantic object with return value"
//
// This inline function spawns a process for execution. The execution semantics 
// for the process being spawned will be provided by the supplied object 
// instance via its () operator. (E.g., a BOOST bound function) That operator 
// returns a value, which will be placed in the supplied return location. 
// After creating the process it is registered with the simulator.
//     object   =  object instance providing the execution semantics via its () 
//                 operator.
//     r_p      -> where to place the value of the () operator.
//     name_p   =  optional name for object instance, or zero.
//     opt_p    -> optional spawn options for process, or zero for the default.
//------------------------------------------------------------------------------

#if !defined (__HP_aCC)

template<typename T>
class sc_spawn_object_v : public sc_process_host {
  public:
    sc_spawn_object_v( typename T::result_type* r_p, T object ) :
        m_object(object), m_result_p(r_p)
    {
    }

    virtual void semantics()
    {
        *m_result_p = m_object();
    }

  protected:
    T                        m_object;
    typename T::result_type* m_result_p;
};

template <typename T>
inline sc_process_handle sc_spawn( 
    typename T::result_type* r_p, 
    T object, 
    const char* name_p = 0,
    const sc_spawn_options* opt_p = 0)
{
    sc_simcontext*      context_p;
    sc_spawn_object_v<T>* spawn_p;
    
    context_p = sc_get_curr_simcontext();
    
    spawn_p = new sc_spawn_object_v<T>(r_p, object);
    if ( !opt_p || !opt_p->is_method() )
    {
            sc_process_handle thread_handle = context_p->create_thread_process( 
            name_p, true,
            SC_MAKE_FUNC_PTR(sc_spawn_object_v<T>,semantics), 
            spawn_p, opt_p 
        );
        return thread_handle;
    }
    else
    {
            sc_process_handle method_handle = context_p->create_method_process( 
            name_p, true,
            SC_MAKE_FUNC_PTR(sc_spawn_object_v<T>,semantics), 
            spawn_p, opt_p 
        );
        return method_handle;
    }
}

#else
// for HP aCC
template<typename T, typename R>
class sc_spawn_object_v : public sc_process_host {
  public:
    sc_spawn_object_v( R* r_p, T object) :
        m_object(object), m_result_p(r_p)
    {
    }

    virtual void semantics()
    {
        *m_result_p = m_object();
    }

  protected:
    T  m_object;
    R* m_result_p;
};

template <typename T, typename R>
inline sc_process_handle sc_spawn( 
    R* r_p, 
    T object, 
    const char* name_p = 0,
    const sc_spawn_options* opt_p = 0)
{
    sc_simcontext*      context_p;
    sc_spawn_object_v<T,R>* spawn_p;
    
    context_p = sc_get_curr_simcontext();
    
    spawn_p = new sc_spawn_object_v<T,R>(r_p, object);
    if ( !opt_p || !opt_p->is_method() )
    {
            sc_process_handle thread_handle = context_p->create_thread_process( 
            name_p, true,
            static_cast<sc_core::SC_ENTRY_FUNC>(
                &sc_spawn_object_v<T,R>::semantics),
            spawn_p, opt_p 
        );
        return thread_handle;
    }
    else
    {
            sc_process_handle method_handle = context_p->create_method_process( 
            name_p, true,
            static_cast<sc_core::SC_ENTRY_FUNC>(
                &sc_spawn_object_v<T,R>::semantics), 
            spawn_p, opt_p 
        );
        return method_handle;
    }
}

#endif // HP

} // namespace sc_core

#endif // !defined(sc_spawn_h_INCLUDED)

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