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Re: GNUstep and valgrind


From: Richard Frith-Macdonald
Subject: Re: GNUstep and valgrind
Date: Wed, 14 Mar 2018 09:22:45 +0000


> On 13 Mar 2018, at 23:53, amon <address@hidden> wrote:
> 
> Perhaps someone can tell me if my guess on the following is
> correct. After an afternoon of trying to figure out where the
> large number of leaks reported by valgrind were coming from, I
> went all the way back to basics. What it seems to show is that
> the GNUStep run time allocates a bunch of stuff at start up and
> never clears it.

Yes, there's a whole lot of stuff cached ... not just on startup but also on 
demand (ie the first time the program uses some feature).

If you look at the NSObject extensions documentation (or the 
GNUstep/NSObject+GNUstepBase.h header) you will see festures for handling 
cleanup of that sort of thing on process exit.
Be aware though that, because it's normally a bad idea to explicitly free stuff 
on exit, cleanup is not normally enabled (with the +setShouldCleanUp: method or 
the GNUSTEP_SHOULD_CLEAN_UP environment variable) so it's a relatively untested 
feature and is definitely incomplete (many classes that could support cleanup 
of their cached information just don't implement it).
If you are interested in contributing additional cleanup code it would be 
welcome for those cases where people want to use valgrind on processes that 
terminate.
Mostly I deal with code that runs 24x7 so cleanup of cached memory is not an 
issue and I only worry about actual leaks,  but it's reassuring to have 
valgrind tell you that a process frees all memory before exit anyway.




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