"Jos� Alberto" <HIGHLAND@santandersupernet.com> wrote in message
news:a0eqqq$9dk$1@news.ya.com...
> Hello to everybody,
>
> I need to use semaphores for a concurrent program, but I've been told not
to
> use the entry clause, but I can use the Ada.Synchronous_Task_Control
> package.

You may want to take a look at my article in the patterns archive, on this
very subject:

I'm Queueless, or, Suspension Objects Instead of Entries
http://www.acm.org/archives/wa.cgi?A2=ind9904&L=patterns&P=R7659

See also:

Task Synchronization Using Suspension Objects
http://www.acm.org/archives/wa.cgi?A2=ind9904&L=patterns&P=R4138