Re: spoonbill vs. -HEAD

Stefan Kaltenbrunner <stefan@kaltenbrunner.cc> writes:
> On 04/03/2013 12:59 AM, Tom Lane wrote:
>> BTW, on further thought it seems like maybe this is an OpenBSD bug,
>> at least in part: what is evidently happening is that the temporary
>> blockage of SIGINT during the handler persists even after we've
>> longjmp'd back to the main loop.  But we're using sigsetjmp(..., 1)
>> to establish that longjmp handler --- so why isn't the original signal
>> mask reinstalled when we return to the main loop?
>>
>> If (your version of) OpenBSD is getting this wrong, it'd explain why
>> we've not seen similar behavior elsewhere.

> hmm trolling the openbsd cvs history brings up this:
> http://www.openbsd.org/cgi-bin/cvsweb/src/sys/arch/sparc64/sparc64/machdep.c?r1=1.143;sortby=date#rev1.143

That's about alternate signal stacks, which we're not using.

I put together a simple test program (attached) and tried it on
spoonbill, and it says that the signal *does* get unblocked when control
returns to the sigsetjmp(...,1).  So now I'm really confused.  Somehow
the results we're getting in a full-fledged backend do not match up with
the results gotten by this test program ... but why?

            regards, tom lane