source: soft/giet_vm/libs/mwmr_channel.h @ 179

//////////////////////////////////////////////////////////////////////////////////
// File     : mwmr_channel.h         
// Date     : 01/04/2012
// Author   : alain greiner
// Copyright (c) UPMC-LIP6
///////////////////////////////////////////////////////////////////////////////////

#ifndef _MWMR_CHANNEL_H_
#define _MWMR_CHANNEL_H_

///////////////////////////////////////////////////////////////////////////////////
//  MWMR channel structure
// The data array size is defined to obtain sizeof(mwmr_channel_t) = 4096 bytes.
// The actual size can be redefined in the mapping info data structure.
///////////////////////////////////////////////////////////////////////////////////

typedef struct mwmr_channel_s {
    unsigned int        ptr;                    // index of the first valid data word
    unsigned int        ptw;                    // index of the first empty slot 
    unsigned int        sts;                    // number of words available
    unsigned int        depth;                  // max number of words in the channel
    unsigned int        width;                  // number of word in an item    
    unsigned int        lock;                   // exclusive access lock
    unsigned int        data[1];                // circular buffer
} mwmr_channel_t;

//////////////////////////////////////////////////////////////////////////////
//  MWMR access functions
//////////////////////////////////////////////////////////////////////////////

void mwmr_write( mwmr_channel_t*            mwmr, 
                 const unsigned int*    buffer,
                 unsigned int               nitems );

void mwmr_read( mwmr_channel_t*         mwmr, 
                unsigned int*           buffer,
                unsigned int            nitems );
#endif