From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fdb77,764cbe34e0365b81 X-Google-Attributes: gidfdb77,public X-Google-Thread: 103376,4438af6225b2af65 X-Google-Attributes: gid103376,public X-Google-Thread: 109fba,4438af6225b2af65 X-Google-Attributes: gid109fba,public From: "Charles R. Lyttle" Subject: Re: Real time Java? Huh? Date: 1998/11/07 Message-ID: <3644BFAC.B9AB22F0@flash.net>#1/1 X-Deja-AN: 409510503 Content-Transfer-Encoding: 7bit References: <363E1DE8.4189EBAC@solaris.ok> <364024f5.3575731@news.demon.co.uk> <364071C4.619D@world.std.com> <3641ca4b.23637018@news.demon.co.uk> <3641B718.DBF4C37C@tisny.com> <36431ca0.301400410@news.netcomuk.co.uk> <364224FB.7FCF@world.std.com> <71tpsr$hva$1@supernews.com> <36427517.27089188@news.nmia.com> <36428b55.0@blushng.jps.net> <3642a327.38883600@news.nmia.com> <71vhli$hul$1@nnrp1.dejanews.com> Content-Type: text/plain; charset=us-ascii Organization: self Mime-Version: 1.0 Newsgroups: comp.lang.java.advocacy,comp.lang.ada,comp.lang.c++ Date: 1998-11-07T00:00:00+00:00 List-Id: oopster@my-dejanews.com wrote: > > In article <3642a327.38883600@news.nmia.com>, > joconnor@roadrunner.com wrote: > > On Thu, 05 Nov 1998 21:36:10 -0800, Joseph <**********@*******.**> > > wrote: > > > > >I missed way too much of this thread. Java as a real time language? > > >Tell me that this is a hoax, please. > > > > That gist of it is that some companies are breaking with Sun and > > trying to establish a standard for Java in real time systems. > > More accurately, the gist is that Sun has a proposed standard for real-time > Java, and a group of other companies has also formed a consortium to promote > a somewhat different realtime Java standard. The main issue seems to be the > licensing terms for Sun Embedded Java. > > HP has already produced a competing embedded Java VM, which they are also > licensing to other companies. > > > I remember being at a Alsys demonstration once where one of the Ada > > compiler writers warned against using exception handling in hard real > > time systems because you couldn't guarantee how long it would take to > > unwind to find the handler for the raised exception. I wonder if such > > conditions esist for exception handling in Java? (Or dynamic > > dispatch, for that matter) > > Is it still the case that Ada exceptions are to be avoided for real-time? > Not a good thing if true... > > It seems clear that deterministic exception handling will be critical to > real-time Java efforts. I'm sure you can find out more about this at the > various real-time Java websites if you're interested. > > -----------== Posted via Deja News, The Discussion Network ==---------- > http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own Exceptions are never to be used in Ada ( or Java) for any reason other than to catch totaly unpredictable disasters. Java IOStreams will have to be completely re-written if Java is to be used in hard real-time systems. Until then don't use ^D or ^Z to end an input stream. -- Russ Lyttle, PE