© Thomas Kunz 2000
SCE 574
199
Language with Support for Concurrency:
Ada
äExplicit language
support for concurrency
äHas a programming
construct named a task
äEach task is a
thread with its own stack
äTasks are objects
with methods named entries
Task Stack is
Entry Init(....);
Entry Push(...);
Entry Pop(...);
End Stack;
Task body Stack is
Begin
Loop
Select
accept
Init(....) do ......
End
Init;
or
accept
Push(...) do .....
End
Push;
....
End
select;
Other
work....
End
Loop
End Stack;
Task chooses
which
entries it
will accept
calls from
When Ada
code is compiled
these
language keywords such
as accept,
and the rendezvous to
entries are
replaced with subprogram
calls to the
Ada runtime. The
result is a
threaded application described
using the
Ada language