[Haskell-cafe] Rewrite NetBSD kernel driver using Ajhc Haskell compiler

Kiwamu Okabe kiwamu at debian.or.jp
Wed Feb 19 15:30:59 UTC 2014

Hi Johnny, I had forgotten important point.

> On Wed, Feb 19, 2014 at 11:57 PM, Johnny Billquist <bqt at update.uu.se> wrote:
>> Maybe someone with more insight could explain to an idiot like me how
>> Haskell garbage collection is handled when running in the kernel?

Running a simple logic in the kernel, it doesn't call GC.


Ajhc Haskell compiler creates program binary that has "context local heap".
A lot of binaries have only one global heap.
If C language code calls Haskell code, Ajhc runtime create new arena for GC.
Sometime Haskell code runs allocator (s_alloc()),
then the runtime allocates Heap area.
Haskell context gets the end of life, the arena and heap are recovered
by the runtime.

In the kernel, the recover is called before the GC.
But I think my custom kernel is ready to call GC in interrupt handler.

Kiwamu Okabe

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