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authorJohn Ankarström <john@ankarstrom.se>2022-07-19 12:16:15 +0200
committerJohn Ankarström <john@ankarstrom.se>2022-07-19 12:16:15 +0200
commit34c32802122ff80e79d850d44cbc84624d9a5840 (patch)
treeb03f55581dda8ad8560ca8e0fd2f2eb341392345 /pl
parent2a7f4bcd4c04d0e48e580c4b11a94174bc5b09ae (diff)
downloadEpisodeBrowser-34c32802122ff80e79d850d44cbc84624d9a5840.tar.gz
Fix Prolog memory leaks.
Apparently foreign frames ARE needed when calling Prolog from C. The official documentation is very terse and could make this clearer. To summarize, whenever a term is created (e.g., PL_new_term_refs), its reference count is increased by one. It is garbage-collected when its reference count hits zero. But the reference count is never decreased unless (a) control returns to Prolog after executing a foreign predicate -- which does not happen in my application -- or (b) the foreign frame in which the term was created is closed. In other words, terms must be created within a foreign frame. This is achieved by initializing a Frame object before creating the term and destroying it once the term has served its purpose. The destructor for Frame does not DISCARD the frame, only CLOSE it. The former would also invalidate all data bound by the terms, which is usually undesirable.
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