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with this work for additional information regarding copyright ownership.
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*****************************************************************************/
/*****************************************************************************
sc_fifo.h -- The sc_fifo<T> primitive channel class.
Original Author: Martin Janssen, Synopsys, Inc., 2001-05-21
CHANGE LOG IS AT THE END OF THE FILE
*****************************************************************************/
#ifndef SC_FIFO_H
#define SC_FIFO_H
#include "sysc/communication/sc_communication_ids.h"
#include "sysc/communication/sc_prim_channel.h"
#include "sysc/communication/sc_fifo_ifs.h"
#include "sysc/kernel/sc_event.h"
#include "sysc/kernel/sc_simcontext.h"
#include "sysc/tracing/sc_trace.h"
#include <typeinfo>
namespace sc_core {
// ----------------------------------------------------------------------------
// CLASS : sc_fifo<T>
//
// The sc_fifo<T> primitive channel class.
// ----------------------------------------------------------------------------
template <class T>
class sc_fifo
: public sc_fifo_in_if<T>,
public sc_fifo_out_if<T>,
public sc_prim_channel
{
public:
// constructors
explicit sc_fifo( int size_ = 16 )
: sc_prim_channel( sc_gen_unique_name( "fifo" ) ),
m_data_read_event(
(std::string(SC_KERNEL_EVENT_PREFIX)+"_read_event").c_str()),
m_data_written_event(
(std::string(SC_KERNEL_EVENT_PREFIX)+"_write_event").c_str())
{ init( size_ ); }
explicit sc_fifo( const char* name_, int size_ = 16 )
: sc_prim_channel( name_ ),
m_data_read_event(
(std::string(SC_KERNEL_EVENT_PREFIX)+"_read_event").c_str()),
m_data_written_event(
(std::string(SC_KERNEL_EVENT_PREFIX)+"_write_event").c_str())
{ init( size_ ); }
// destructor
virtual ~sc_fifo()
{ delete [] m_buf; }
// interface methods
virtual void register_port( sc_port_base&, const char* );
// blocking read
virtual void read( T& );
virtual T read();
// non-blocking read
virtual bool nb_read( T& );
// get the number of available samples
virtual int num_available() const
{ return ( m_num_readable - m_num_read ); }
// get the data written event
virtual const sc_event& data_written_event() const
{ return m_data_written_event; }
// blocking write
virtual void write( const T& );
// non-blocking write
virtual bool nb_write( const T& );
// get the number of free spaces
virtual int num_free() const
{ return ( m_size - m_num_readable - m_num_written ); }
// get the data read event
virtual const sc_event& data_read_event() const
{ return m_data_read_event; }
// other methods
operator T ()
{ return read(); }
sc_fifo<T>& operator = ( const T& a )
{ write( a ); return *this; }
void trace( sc_trace_file* tf ) const;
virtual void print( ::std::ostream& = ::std::cout ) const;
virtual void dump( ::std::ostream& = ::std::cout ) const;
virtual const char* kind() const
{ return "sc_fifo"; }
protected:
virtual void update();
// support methods
void init( int );
void buf_init( int );
bool buf_write( const T& );
bool buf_read( T& );
protected:
int m_size; // size of the buffer
T* m_buf; // the buffer
int m_free; // number of free spaces
int m_ri; // index of next read
int m_wi; // index of next write
sc_port_base* m_reader; // used for static design rule checking
sc_port_base* m_writer; // used for static design rule checking
int m_num_readable; // #samples readable
int m_num_read; // #samples read during this delta cycle
int m_num_written; // #samples written during this delta cycle
sc_event m_data_read_event;
sc_event m_data_written_event;
private:
// disabled
sc_fifo( const sc_fifo<T>& );
sc_fifo& operator = ( const sc_fifo<T>& );
};
// IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
template <class T>
inline
void
sc_fifo<T>::register_port( sc_port_base& port_,
const char* if_typename_ )
{
std::string nm( if_typename_ );
if( nm == typeid( sc_fifo_in_if<T> ).name() ||
nm == typeid( sc_fifo_blocking_in_if<T> ).name()
) {
// only one reader can be connected
if( m_reader != 0 ) {
SC_REPORT_ERROR( SC_ID_MORE_THAN_ONE_FIFO_READER_, 0 );
}
m_reader = &port_;
} else if( nm == typeid( sc_fifo_out_if<T> ).name() ||
nm == typeid( sc_fifo_blocking_out_if<T> ).name()
) {
// only one writer can be connected
if( m_writer != 0 ) {
SC_REPORT_ERROR( SC_ID_MORE_THAN_ONE_FIFO_WRITER_, 0 );
}
m_writer = &port_;
}
else
{
SC_REPORT_ERROR( SC_ID_BIND_IF_TO_PORT_,
"sc_fifo<T> port not recognized" );
}
}
// blocking read
template <class T>
inline
void
sc_fifo<T>::read( T& val_ )
{
while( num_available() == 0 ) {
sc_core::wait( m_data_written_event );
}
m_num_read ++;
buf_read( val_ );
request_update();
}
template <class T>
inline
T
sc_fifo<T>::read()
{
T tmp;
read( tmp );
return tmp;
}
// non-blocking read
template <class T>
inline
bool
sc_fifo<T>::nb_read( T& val_ )
{
if( num_available() == 0 ) {
return false;
}
m_num_read ++;
buf_read( val_ );
request_update();
return true;
}
// blocking write
template <class T>
inline
void
sc_fifo<T>::write( const T& val_ )
{
while( num_free() == 0 ) {
sc_core::wait( m_data_read_event );
}
m_num_written ++;
buf_write( val_ );
request_update();
}
// non-blocking write
template <class T>
inline
bool
sc_fifo<T>::nb_write( const T& val_ )
{
if( num_free() == 0 ) {
return false;
}
m_num_written ++;
buf_write( val_ );
request_update();
return true;
}
template <class T>
inline
void
sc_fifo<T>::trace( sc_trace_file* tf ) const
{
#if defined(DEBUG_SYSTEMC)
char buf[32];
std::string nm = name();
for( int i = 0; i < m_size; ++ i ) {
std::sprintf( buf, "_%d", i );
sc_trace( tf, m_buf[i], nm + buf );
}
#endif
}
template <class T>
inline
void
sc_fifo<T>::print( ::std::ostream& os ) const
{
if( m_free != m_size ) {
int i = m_ri;
do {
os << m_buf[i] << ::std::endl;
i = ( i + 1 ) % m_size;
} while( i != m_wi );
}
}
template <class T>
inline
void
sc_fifo<T>::dump( ::std::ostream& os ) const
{
os << "name = " << name() << ::std::endl;
if( m_free != m_size ) {
int i = m_ri;
int j = 0;
do {
os << "value[" << i << "] = " << m_buf[i] << ::std::endl;
i = ( i + 1 ) % m_size;
j ++;
} while( i != m_wi );
}
}
template <class T>
inline
void
sc_fifo<T>::update()
{
if( m_num_read > 0 ) {
m_data_read_event.notify(SC_ZERO_TIME);
}
if( m_num_written > 0 ) {
m_data_written_event.notify(SC_ZERO_TIME);
}
m_num_readable = m_size - m_free;
m_num_read = 0;
m_num_written = 0;
}
// support methods
template <class T>
inline
void
sc_fifo<T>::init( int size_ )
{
buf_init( size_ );
m_reader = 0;
m_writer = 0;
m_num_readable = 0;
m_num_read = 0;
m_num_written = 0;
}
template <class T>
inline
void
sc_fifo<T>::buf_init( int size_ )
{
if( size_ <= 0 ) {
SC_REPORT_ERROR( SC_ID_INVALID_FIFO_SIZE_, 0 );
}
m_size = size_;
m_buf = new T[m_size];
m_free = m_size;
m_ri = 0;
m_wi = 0;
}
template <class T>
inline
bool
sc_fifo<T>::buf_write( const T& val_ )
{
if( m_free == 0 ) {
return false;
}
m_buf[m_wi] = val_;
m_wi = ( m_wi + 1 ) % m_size;
m_free --;
return true;
}
template <class T>
inline
bool
sc_fifo<T>::buf_read( T& val_ )
{
if( m_free == m_size ) {
return false;
}
val_ = m_buf[m_ri];
m_buf[m_ri] = T(); // clear entry for boost::shared_ptr, et al.
m_ri = ( m_ri + 1 ) % m_size;
m_free ++;
return true;
}
// ----------------------------------------------------------------------------
template <class T>
inline
::std::ostream&
operator << ( ::std::ostream& os, const sc_fifo<T>& a )
{
a.print( os );
return os;
}
} // namespace sc_core
//$Log: sc_fifo.h,v $
//Revision 1.6 2011/08/26 20:45:40 acg
// Andy Goodrich: moved the modification log to the end of the file to
// eliminate source line number skew when check-ins are done.
//
//Revision 1.5 2011/03/23 16:17:22 acg
// Andy Goodrich: hide the sc_events that are kernel related.
//
//Revision 1.4 2011/02/18 20:23:45 acg
// Andy Goodrich: Copyright update.
//
//Revision 1.3 2009/10/14 19:05:40 acg
// Andy Goodrich: added check for blocking interfaces in addition to the
// combined blocking/nonblocking interface.
//
//Revision 1.2 2009/05/22 16:06:24 acg
// Andy Goodrich: process control updates.
//
//Revision 1.1.1.1 2006/12/15 20:20:04 acg
//SystemC 2.3
//
//Revision 1.4 2006/01/24 20:46:31 acg
//Andy Goodrich: changes to eliminate use of deprecated features. For instance,
//using notify(SC_ZERO_TIME) in place of notify_delayed().
//
//Revision 1.3 2006/01/13 20:41:59 acg
//Andy Goodrich: Changes to add port registration to the things that are
//checked when SC_NO_WRITE_CHECK is not defined.
//
//Revision 1.2 2006/01/03 23:18:26 acg
//Changed copyright to include 2006.
//
//Revision 1.1.1.1 2005/12/19 23:16:43 acg
//First check in of SystemC 2.1 into its own archive.
//
//Revision 1.12 2005/09/15 23:01:51 acg
//Added std:: prefix to appropriate methods and types to get around
//issues with the Edison Front End.
//
//Revision 1.11 2005/06/10 22:43:55 acg
//Added CVS change log annotation.
//
#endif
// Taf!