Function signal_index_deletion

src/jrd/idx.cpp:2175–2224

static void signal_index_deletion(thread_db* tdbb, jrd_rel* relation, USHORT id)
{
/**************************************
 *
 *	s i g n a l _ i n d e x _ d e l e t i o n
 *
 **************************************
 *
 * Functional description
 *	On delete of an index, force all
 *	processes to get rid of index info.
 *
 **************************************/
	IndexBlock* index_block;
	Lock* lock = NULL;

	SET_TDBB(tdbb);

	// get an exclusive lock on the associated index
	// block (if it exists) to make sure that all other
	// processes flush their cached information about this index

	for (index_block = relation->rel_index_blocks; index_block; index_block = index_block->idb_next)
	{
		if (index_block->idb_id == id)
		{
			lock = index_block->idb_lock;
			break;
		}
	}

	// if one didn't exist, create it

	if (!index_block)
	{
		index_block = IDX_create_index_block(tdbb, relation, id);
		lock = index_block->idb_lock;
	}

	// signal other processes to clear out the index block

	if (lock->lck_physical == LCK_SR) {
		LCK_convert(tdbb, lock, LCK_EX, LCK_WAIT);
	}
	else {
		LCK_lock(tdbb, lock, LCK_EX, LCK_WAIT);
	}

	release_index_block(tdbb, index_block);
}