7.9.2 Status and future of shared tabling

Currently, shared tabling has many restrictions. The implementation does not verify that the limitations are met and violating these restrictions may cause incorrect results or crashes. Future versions are expected to resolve these issues.

• Shared tabling currently only handles the basic scenario and cannot yet deal with well formed semantics or incremental tabling.
• As described in section 7.9.1, abolishing shared tables may cause unnecessary waiting for threads to complete the table.
• Only the answers of shared tables can be reclaimed, not the answer table itself.

SWI-Prolog's continuation based tabling offers the opportunity to perform completion using multiple threads.