Function CMP_get_index_lock

src/jrd/cmp.cpp:279–322

IndexLock* CMP_get_index_lock(thread_db* tdbb, jrd_rel* relation, USHORT id)
{
/**************************************
 *
 *	C M P _ g e t _ i n d e x _ l o c k
 *
 **************************************
 *
 * Functional description
 *	Get index lock block for index.  If one doesn't exist,
 *	make one.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* dbb = tdbb->getDatabase();

	DEV_BLKCHK(relation, type_rel);

	if (relation->rel_id < (USHORT) rel_MAX) {
		return NULL;
	}

	// for to find an existing block

	for (IndexLock* index = relation->rel_index_locks; index; index = index->idl_next)
	{
		if (index->idl_id == id) {
			return index;
		}
	}

	IndexLock* index = FB_NEW_POOL(*relation->rel_pool) IndexLock();
	index->idl_next = relation->rel_index_locks;
	relation->rel_index_locks = index;
	index->idl_relation = relation;
	index->idl_id = id;
	index->idl_count = 0;

	Lock* lock = FB_NEW_RPT(*relation->rel_pool, 0) Lock(tdbb, sizeof(SLONG), LCK_idx_exist);
	index->idl_lock = lock;
	lock->setKey((relation->rel_id << 16) | id);

	return index;
}


void CMP_post_access(thread_db* tdbb,