Exec actor (was Re: [kepler-dev] 2d display widget?)

[Dan Higgins]

I forgot to send this to everybody !

The 'gobble' threads are really a 'fix' to the limited size of io 
buffers on the Windows OS.Without them, subprocesses often hang under 
Windows. stdin/stdout are handled much better on Unix machines and such 
threads are probably not needed.

And I think that it is the Windows version of exec() that is especially 
crude!

Dan

Christopher Brooks wrote:

>The Java exec() is rather crude.
>
>My understanding is that we want to read from Process as we go along
>because there are limits to the size of the buffer.  I vaguely
>remember there also being problems if we did not start reading
>from the Process rather promptly.
>
>The Exec actor I hacked up is documented at
>http://ptolemy.eecs.berkeley.edu/ptolemyII/ptII4.0/ptII4.0/doc/codeDoc/ptolemy/actor/lib/Exec.html
>The documentation has a typo in one of the resource URLs, the correct
>URL is
>http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html
>another URL is
>http://mindprod.com/jgloss/exec.html
>
>
>-Christopher
>
>--------
>
>    On Wed, 28 Jul 2004, Dan Higgins wrote:
>    
>    > dir which uses an actor called 'InteractiveExec'. This was a rought
>    
>    Why does the Exec / InteractiveExec actor spawn off threads to 'gobble'
>    input from the underlying process's stdout?
>    
>    Would it be possible to just let the operating system buffer the standard
>    i/o streams, and then read all available data from stdout in the fire()
>    method?
>    
>    Tobin
>    
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-- 
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Dan Higgins                                  higgins at nceas.ucsb.edu
http://www.nceas.ucsb.edu/    Ph: 805-892-2531
National Center for Ecological Analysis and Synthesis (NCEAS) 
735 State Street - Room 205
Santa Barbara, CA 93195
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