Initial commit of OpenSPARC T2 design and verification files.

[OpenSPARC-T2-DV] / verif / model / vendor / TLM-2006-11-29 / tlm / tlm_core / tlm_fifo / tlm_fifo_peek.h

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

 The following code is derived, directly or indirectly, from the SystemC
 source code Copyright (c) 1996-2004 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.

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


#ifndef TLM_FIFO_PEEK_HEADER
#define TLM_FIFO_PEEK_HEADER

#ifndef TLM_FIFO_HEADER
#include "tlm_core/tlm_fifo/tlm_fifo.h"
#endif

template < typename T>
inline
T
tlm_fifo<T>::peek( tlm_tag<T> * ) const {

 while( is_empty() ) {

   // this const cast is only needed because sc_prim_channel::wait(.) is
   // for some unknown reason, not const

   const_cast< tlm_fifo<T> * >( this )->wait( m_data_written_event );

 }

 return buffer->read_data();

}

template < typename T>
inline
bool
tlm_fifo<T>::nb_peek( T &t ) const {

 if( used() < 1 ) {
   return false;
 }

 t = buffer->peek_data( 0 );
 return true;

}

template < typename T>
inline
bool
tlm_fifo<T>::nb_peek( T &t , int n ) const {

 if( n >= used() || n < -1 ) {
   return false;
 }
 
 if( n == -1 ) {
   n = used() - 1;
 }

 t = buffer->peek_data( n );
 return true;

}
   
template< typename T >
inline
bool
tlm_fifo<T>::nb_can_peek( tlm_tag<T> * ) const
{
 return !is_empty();
}

template < typename T>
inline
bool
tlm_fifo<T>::nb_poke( const T &t , int n ) {

 if( n >= used() || n < 0 ) {
   return false;
 }

 buffer->poke_data( n ) = t;
 return true;

}

#endif