public void Truncate(Pid id)
{
if (Cache != null)
{
PgHdr p;
PgHdr next;
for (p = Dirty; p != null; p = next)
{
next = p.DirtyNext;
// This routine never gets call with a positive pgno except right after sqlite3PcacheCleanAll(). So if there are dirty pages, it must be that pgno==0.
Debug.Assert(p.ID > 0);
if (C._ALWAYS(p.ID > id))
{
Debug.Assert((p.Flags & PgHdr.PGHDR.DIRTY) != 0);
MakeClean(p);
}
}
if (id == 0 && Page1 != null)
{
Page1.memsetData(SizePage);
id = 1;
}
Cache.Truncate(id + 1);
}
}
