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From: Ted Dennison<dennison@telepath.com>
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Subject: Re: why not
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In article <tu0gfdn5h25i11@corp.supernews.com>, Matthew Heaney says...
>
>We certainly do NOT agree that data structures should be "task safe."  If a
>user needs a data structure to work in the presence of multiple threads,
>then he needs to build those semantics himself using other primitives
>provided by the language.  This is completely consistent with how Text_IO
>and Numerics.Discrete_Random (for example) are defined.

I'm not particularly happy that Text_IO works that way (its a tremendous source
of errors), but I think I have to agree. It'd be nice to have task safe
versions, but given the state of the rest of the standard Ada library, it would
probably be more consistent *not* to have them. However, an instantiation of the
facility should be task safe when *different* container objects are being used
(no globals).


>
>> No question. But then it's harder to precisely specify what the behavior
>> is without saying "it behaves like this implementation."
>
>You need to specify time and space semantics for any abstraction.  This is a
>solved problem.
>
>> > Since apparently C++ has succeeded in including a similar library in its
>> > standard, I wouldn't think the task is either impossible or totally
>> > undesirable. I'd just favor a more gradual approach.
>>
>> But have they succeeded? It took years before any of the STL
>> implementations were compatible and correct, IIRC.
>
>FUD.  Of course they succeeded.  C++ is vastly simpler to use now that the
>STL is part of the standard.
>
>
>
>

---
T.E.D.    homepage   - http://www.telepath.com/dennison/Ted/TED.html

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