GNAT Task Scheduling in Linux

[Manuel Carro <boris@lml.ls.fi.upm.es>]

    Hello.  I have a question regarding the (default) task scheduling
policy of GNAT (3.13p) in Linux.  I have a simple program which starts
some tasks which increment a nonprotected variable.  The tasks should
start (almost) at once, so that the variable is incremented
concurrently (and wrongly), and the problem is that every task is
started only after another task has finished.  Hence, the problem of
concurrent access does not show up.

    Changing the adalib and adainclude links in the distribution from
rts-sfu to rts-native solved the issue: the different tasks start
(almost) at once.  The question is if there is any way to force the
latter behavior *without* fiddling around with the links.  I am not
terribly worried about performance, because we will use Ada as an
educational tool in an academic environment.

    Thanks a lot in advance.


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          ||            Manuel Carro -- DLSIIS            ||
          ||           e-mail: mcarro@fi.upm.es           ||
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