Ada 95 Quality and Style Guide | Chapter 7 |
A discussion of Ada tasking dependencies when employed in a distributed
target environment is beyond the scope of this book. For example,
multiprocessor task scheduling, interprocessor rendezvous, and
the distributed sense of time through package Calendar
are all subject to differences between implementations. For more
information, Nissen and Wallis (1984) and ARTEWG (1986) touch
on these issues, and Volz et al. (1985) is one of many research
articles available.
If the Real-Time Systems Annex is supported, then many concurrency
aspects are fully defined and, therefore, a program can rely on
these features while still being portable to other implementations
that conform to the
Real-Time Systems Annex. The following sections provide
guidelines based on the absence of this annex.
7.4 TASKING
The definition of tasking in the Ada language leaves many characteristics
of the tasking model up to the implementor. This allows a vendor
to make appropriate tradeoffs for the intended application domain,
but it also diminishes the portability of designs and code employing
the tasking features. In some respects, this diminished portability
is an inherent characteristic of concurrency approaches (see Nissen
and Wallis 1984, 37).
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