sc_join.cpp

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

  sc_join.cpp -- Join Process Synchronization Implementation

  Original Author: Andy Goodrich, Forte Design Systems, 5 May 2003

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

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  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
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// $Log: sc_join.cpp,v $
// Revision 1.1.1.1  2006/12/15 20:31:37  acg
// SystemC 2.2
//
// Revision 1.3  2006/01/13 18:44:29  acg
// Added $Log to record CVS changes into the source.
//

#include <cassert>
#include <cstdlib>
#include <cstddef>

#include "sysc/kernel/sc_process_handle.h"
#include "sysc/kernel/sc_simcontext.h"
#include "sysc/kernel/sc_simcontext_int.h"
#include "sysc/kernel/sc_kernel_ids.h"
#include "sysc/kernel/sc_thread_process.h"
#include "sysc/kernel/sc_join.h"

namespace sc_core {

//------------------------------------------------------------------------------
//"sc_join::add_process - sc_process_b*"
//
// This method adds a process to this join object instance. This consists of
// incrementing the count of processes in the join process and adding this 
// object instance to the supplied thread's monitoring queue.
//     process_p -> thread to be monitored.
//------------------------------------------------------------------------------
void sc_join::add_process( sc_process_b* process_p )
{
    sc_thread_handle handle = DCAST<sc_thread_handle>(process_p);
    assert( handle != 0 );
    m_threads_n++;
    handle->add_monitor( this );
}


//------------------------------------------------------------------------------
//"sc_join::add_process - sc_process_handle"
//
// This method adds a process to this join object instance. This consists of
// incrementing the count of processes in the join process and adding this 
// object instance to the supplied thread's monitoring queue.
//     process_h = handle for process to be monitored.
//------------------------------------------------------------------------------
void sc_join::add_process( sc_process_handle process_h )
{
    sc_thread_handle thread_p; // Thread within process_h.

    thread_p = process_h.operator sc_thread_handle();
    if ( thread_p )
    {
        m_threads_n++;
        thread_p->add_monitor( this );
    }
    else
    {
        SC_REPORT_ERROR( SC_ID_JOIN_ON_METHOD_HANDLE_, 0 ); 
    }
}


//------------------------------------------------------------------------------
//"sc_join::signal"
//
// This virtual method is called when a process being monitored by this object
// instance sends a signal. If the signal type is spm_exit and the count of 
// threads that we are waiting to terminate on goes to zero we fire our join 
// event.
//     thread_p -> thread that is signalling.
//     type     =  type of signal being sent.
//------------------------------------------------------------------------------
void sc_join::signal(sc_thread_handle thread_p, int type)
{
    switch ( type )
    {
      case sc_process_monitor::spm_exit:
        thread_p->remove_monitor(this);
        if ( --m_threads_n == 0 ) m_join_event.notify();
        break;
    }
}

} // namespace sc_core

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