david thanks for chasing this difference. I would love to be able to help but I'm concurrently bad :).
Stef > Hi Adrian, > > Overall, it does look like the basic OSProcess functions that most people > would use are working as long as an up to date plugin is available. > > The remaining issue that is relevant to the Pharo image (as opposed to > OSProcess running on any other image) is this CommandShellTestCase issue. > I think we are seeing different, but presumably related, symptoms of some > underlying problem. The tests in CommandShellTestCase do some rather complex > things with lots of processes, semaphore synchronization and so on. So I > think I will need to somehow whittle the problem down to some simpler test > that can provide some more reproduceable symptoms. > > My working assumption is that one of the following is true: > > 1) There is something different in Pharo versus Squeak that is exposing > an existing bug in OSProcess/CommandShell. This is quite likely. > > 2) The CommandShellTestCase is exposing an issue in Pharo related to > Semaphore handling, Delay scheduling, or Process scheduling. The seems > less likely than #1, but still possible because these tests do drive > a lot of interacting processes, and might expose an issue the "normal" > users would never see. > > One thing that I know could produce the sort of symptoms that I am seeing > would be anything that intermittently permitted a signal to a Semaphore > to be missed. This type of problem causes OSProcess to "miss" the exit > of one of its external processes, leading to zombie Unix processes and > tests in Pharo/Squeak that fail to run to completion. > > For that reason, if anyone can think of any changes to process scheduling > and semaphore handling, that might give me an idea of where to look. > > Thanks for all the help, > Dave > > > _______________________________________________ > Pharo-project mailing list > [email protected] > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project _______________________________________________ Pharo-project mailing list [email protected] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
