bool getNextPatternUnlocked(pattern_type & pattern)
{
if ( keep_pairs && pairflag )
{
pairflag = false;
return Preader->getNextPatternUnlocked(pattern);
}
else
{
while ( true )
{
uint64_t const z = rand16() % d;
// RNG keep
if ( z < c )
{
bool const ok = Preader->getNextPatternUnlocked(pattern);
if ( ok )
{
if ( keep_pairs )
pairflag = true;
return true;
}
else
{
// no more reads
return false;
}
}
// RNG drop
else
{
uint64_t const skipcnt = keep_pairs ? 2 : 1;
for ( uint64_t i = 0; i < skipcnt; ++i )
{
bool const ok = Preader->getNextPatternUnlocked(pattern);
if ( ! ok )
return false;
}
}
}
}
}
bool getBuffer(std::pair < char const *, ssize_t > & data)
{
if ( ! (reader.get()) )
return false;
if ( reader->getBuffer(data) )
return true;
if ( ita != ite )
{
while ( ++ita != ite )
{
reader.reset();
reader = UNIQUE_PTR_MOVE(reader_ptr_type(new AsynchronousBufferReader(*ita,numbuffers,bufsize,0)));
if ( reader->getBuffer(data) )
return true;
}
}
return false;
}
/**
* return the last block obtained via getBuffer
**/
void returnBuffer()
{
if ( reader.get() )
reader->returnBuffer();
}
/**
* destructor
**/
~AsynchronousBufferReaderList()
{
if ( reader.get() )
reader->flush();
}
