Re: Ada 95 tasking problems with Ada 83 code

[Simon Wright <simon@pogner.demon.co.uk>]

Wayne Lydecker <wayne@mtws.visicom.com> writes:

> That was exactly what I had in mind.  The majority of our tasks (~75)
> are used to synchronize access to the databases.  Most of the rest are
> for alarm clocks, which were poorly implemented.  I agree 100% that a
> good tasking model works fine for 100+ tasks, but when the tasks have
> infinite loops with a "delay duration'small" to allow a context switch
> for a type of "round robin" scheduling, it's time for a redesign (which
> is really what I want to do).

Good plan! (you may need to look at protected types and semaphores,
mutexes built on them for the synchronisation aspects).

Did you spot Jeff Creem's post about the GNAT tasking implementations
available on Linux? the default (rts-fsu) runs all tasks in the
context of one process -- block one on I/O and you've blocked them
all. Switch to rts-native.