Re: Re no blocking wait on Linux

From: Andi Kleen (ak_at_suse.de)
Date: Mon Jan 14 2002 - 10:16:02 GMT

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    On Mon, Jan 14, 2002 at 09:50:50AM +0000, Tom Hughes wrote:
> In message <200201111853.KAA28214_at_hunter>
>         Rod Armstrong <rod_at_san-jose.tt.slb.com> wrote:
> 
> > On Linux, wait3() must be used in order to get interrupts. Maybe
> > someone with a Redhat system could investigate.
> 
> I've found and solved the wait() problem now. In fact wait() does get
> interrupts but the problem is that Linux blocks signals while they are
> being handled and a longjmp() out of the signal handler does not
> cancel that block, so after the first time SIGIO is blocked and we
> don't get interrupted.

The Linux behaviour is specified in POSIX and should be matched by 
every non ancient unix (unless you set SA_NOMASK).

I would use siglongjmp() always, not conditional on OS_LINUX. 


-Andi

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