True when Action is true for all solutions of Generate.
This has the same semantics as forall/2,
but the Action goals are executed in multiple threads.
Notable a failing Action or a Action throwing an
exception signals the calling thread which in turn aborts all workers
and fails or re-throws the generated error. Options:
Number of threads to use. The default is determined by the Prolog flag cpu_count.
To be done
Ideally we would grow the set of workers dynamically, similar to dynamic
scheduling of HTTP worker threads. This would avoid creating threads
that are never used if Generate is too slow or does not
provide enough answers and would further raise the number of threads if Action
is I/O bound rather than CPU bound.
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