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/* Code Example 1 */

/* a bit of global data */
int priority = 1;

void prepare_data( ... )
{
        ...
        priority = 1;
        ...
        lump_send( some_data );
        ...
}

void lump_send( data_t some_data )
{
        switch( priority )
        {
        case 1:  /* do one thing */
                break;
        case 2: /* do something else */
                break;
        }
}