Re: Some experience with the igc branch

[Gerd Möllmann]

Helmut Eller <eller.helmut@gmail.com> writes:

> On Wed, Dec 25 2024, Gerd Möllmann wrote:
>
>> A problem occurs only, apparently (I've not read the MPS code), when the
>> barrier handling code in MPS is called while being in another signal
>> handler like Emacs' SIGPROF handler.
>>
>>
>> I don't know what exactly the problem is in the end, in MPS. That would
>> be a good question for Richard Brooksby, I think.
>
> The problem is probably simply that MPS uses a non-recursive lock.  The
> SIGSEGV signal handler can't claim the lock when it's already claimed.
>
> See:
> https://memory-pool-system.readthedocs.io/en/latest/design/arena.html#locks
>
> Helmut

Could be, but OTOH then it's strange that things work fine when the
barriers use Mach exceptions.