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kernel: when using julia_gc, call jl_atexit_hook in SyExit #2931

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merged 2 commits into from
Oct 19, 2018

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fingolfin
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... as recommended by https://docs.julialang.org/en/v1/manual/embedding/index.html

This makes it possible to collect coverage data in Julia code (as that is written to disk via that atexit hook).

@fingolfin fingolfin added topic: kernel release notes: not needed PRs introducing changes that are wholly irrelevant to the release notes backport-to-4.10 labels Oct 18, 2018
@ChrisJefferson
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The changes to Panic/SyExit are sensible and good.

One random question -- why doesn't julia_gc just pass jl_atexit_hook to atexit?

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This looks sensible

src/saveload.c Outdated
@@ -374,8 +374,7 @@ static void LoadBagData ( void )

if (TNAM_TNUM(type) == NULL)
{
Pr("Bad type %d, size %d\n",type,size);
exit(1);
Panic("Bad type %d, size %d\n",type,size);
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The compiler seems to complain about the %d

@fingolfin
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@ChrisJefferson fair question, I also wondered. One thing is that jl_atexit_hook expects the exit code as an argument, which is (AFAIK) unknown in regular atexit handlers. I am not aware of other reasons, but that doesn't mean there aren't any. I'll try to find out.

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Wanting the exit code is a good enough reason, in that case I'm happy to merge it (it's not going to effect GAP without Julia anyway of course)

@fingolfin fingolfin merged commit 9d49231 into gap-system:master Oct 19, 2018
@fingolfin fingolfin deleted the mh/jl_atexit_hook branch October 19, 2018 14:08
@fingolfin
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Backported via 19aafe0

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3 participants