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From: Vadim Godunko <vgodunko@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Robert Dewar's great article about the Strengths of Ada over
	other langauges in multiprocessing!
Date: Tue, 11 Mar 2008 08:41:44 -0700 (PDT)
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On Mar 11, 4:58 pm, george.p...@gmail.com wrote:
>
> This code is not multi-core safe.  Are you sure that QString has
> Vtab?  If not then comparison will be unfair.
What is it "Vtab"?

QString implemented in the same way as Universal_String. Both classes
internally use shared data - actual string and reference counter.
Operations on both classes are "reentrant" (see 1) and not "thread-
safe" (see 2). Both classes will be even not "reentrant" without
atomic increment/decrement operations.

PS.

(1) A reentrant function can be called simultaneously by multiple
threads provided that each invocation of the function references
unique data.

(2) A thread-safe function can be called simultaneously by multiple
threads when each invocation references shared data. All access to the
shared data is serialized.