/**
* Get a copy of the Data (non allocating).
* If pull has reserved enough memory to store the copy,
* no memory will be allocated.
*
* @param pull A copy of the data.
*/
virtual void Get( DataType& pull ) const
{
PtrType reading;
// loop to combine Read/Modify of counter
// This avoids a race condition where read_ptr
// could become write_ptr ( then we would read corrupted data).
do {
reading = read_ptr; // copy buffer location
oro_atomic_inc(&reading->counter); // lock buffer, no more writes
if ( reading != read_ptr ) // if read_ptr changed,
oro_atomic_dec(&reading->counter); // better to start over.
else
break;
} while ( true );
// from here on we are sure that 'reading'
// is a valid buffer to read from.
pull = reading->data; // takes some time
oro_atomic_dec(&reading->counter); // release buffer
}
void dec() { oro_atomic_dec( &_val ); }
