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To: Ken Brown <kbrown@cornell.edu>
Subject: RE: mmap failure [was: cygrunsrv + sshd + rsync = 20 times too slow
 -- throttled?]
Thread-Topic: mmap failure [was: cygrunsrv + sshd + rsync = 20 times too slow
 -- throttled?]
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Date: Tue, 7 Sep 2021 21:52:01 +0000
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From: "Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\] via Cygwin" <cygwin@cygwin.com>
Reply-To: "Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\]" <lavr@ncbi.nlm.nih.gov>
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> >
> > With undocumented structure member initialization an issue, maybe better to
> > future proof using e.g.
> >
> >      MEM_EXTENDED_PARAMETER mmap_ext = { 0 }; // or memset or bzero
> 
> I don't see what this would accomplish.  We're already initializing every member
> after Corinna's last patch.
> 

Well, if one day MS decides to use some of the Reserved field by splinting off a new
named field out of that bulk of bits, the code will be in trouble again...
While with memset, bzero or C-style initializer, everything is guaranteed to be zapped with 0.

Anton Lavrentiev
Contractor NIH/NLM/NCBI


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