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From: "G.B." <bauhaus@futureapps.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Exclusive file access
Date: Tue, 1 Sep 2015 18:05:53 +0200
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On 01.09.15 16:05, ahlan@marriott.org wrote:
> So far the only solution I can see is for me to write my own filing system, one that has the ability to open the file for exclusive file access. However I cannot believe that this is what people really do.

If you mean system wide exclusive access to operating system
resources like files needing operating system calls, or else
system defaults, everybody does it that way all the time, I think.

Similarly, access control (users, groups, roles) isn't portable
either, so just calling some ISO language's "file open" with
a Form parameter might or might not be sufficient.

If some tentative call, were it to ever be successful, has

   Name => "//Devices/IO/Network/Card/0",
   Form => "Exclusive"

the effects you mentioned WRT failure, or even just on timeouts,
might be more striking ...