Nate Williams writes:

> > I have serious problems with " Runtime.getRuntime ().exec ()" : either
> > it hangs or gives a spinning mutex running at 99% cpu.

>
> This is a Java FAQ,


Oops. Sorry for the noise ....

> and is unrelated to FreeBSD. This program will hang
> on any OS once you reach a certain threshold of unread output that the
> OS will block the process until something 'reads' the data.
>
> What you need to do is once you execute the command, you need to have a
> process that reads the output from the process.


OK. I see (and most often do); but indeed I didn't in cases where I were just
interested in the exit value of the command (and then afterwards
read "proc.getErrorStream" to see what went wrong ... ).

Thank you very much for your help.

> [ .. ]
> Here is my (trivial) implementation, use it as you see fit.
> [ .. ]


Thanx! I'l try.

> Why it works on linux-sun-jdk15 is probably due to the fact that there
> is more stack space allocated to processes, but if you modified the
> process to generate more output ('ls -R /'), it will eventually fail.



Yop, you're right.

Best,

Arno (a bit ashamed)
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