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Hi, I have read the concurrency webpage from the Xapian documentation: http://getting-started-with-xapian.readthedocs.io/en/latest/concepts/concurrency.html But it is still not clear to me how to ensure thread-safety when using libxapian (C++ API). Usually when doing multi-threading many threads can read the same variable concurrently without locking provided none of the threads modifies the

Hi, We have a search service based on xapian, when receving a request, we create several threads to create xapian-query and search in the corresponding databases, and then merge all results together. In some case, we use Xapian::Query::MatchAll to create the query, but it always has Segmentation fault (core dumped). It looks like some pointers are double freed. This is the function that we use