Hi,
I've uploaded SWI-Prolog 5.6.12. The reason for the quick update is the
discovery of a possible crash calling Prolog from C. Plain Prolog
execution rarely does this (only with_mutex/2 and some things related to
the development environment). Various packages are affected more
seriously. Examples of packages frequently using this style of callback
are XPCE, JPL and XML parser in call-back mode (used by the RDF parser).
The bug is old, probably present in all versions since the introduction
of multi-threading (it affects both single- and multi-threaded versions).
Enjoy --- Jan
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