onCleanup and script
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Hello.
I'm using a parfor loop,but sometimes I stop its execution with ctrl+c, so I would like to execute the command "matlabpool close" immediately in order not to leave the processes on. I have recommended to use onCleanup function,but I have read that I need to use it within a function and not in a script, and I've got a script, owe to that fact I wonder if I could do the same with a try/catch sentence, is it possible?
thanks!
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Walter Roberson
2011-7-27
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No. try/catch cannot catch a control-c .
I would suggest just converting your script in to a function: doing so is likely to be far easier than working around the issue.
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Javier
2011-7-27
Walter Roberson
2011-7-27
Well, you would need an actual function name at the beginning (which must match the name of the file.)
Your cleanup routine does not need to return a value, so you could use
c = onCleanup(@() matlabpool('close'));
and you should define this early on, probably just after you open the pool.
Javier
2011-7-27
Walter Roberson
2011-7-27
The onCleanup function is invoked when the object it returns ("c" in this case) goes out of scope and is destroyed. Normally that happens when the workspace of the function is cleaned up in preparation for returning from the function, but if the object were to be returned or written in to a global or persistent variable, it might get delayed.
onCleanup runs whatever function it is handed. Note that that is _function_: you do not pass it a reference to a particular variable or object.
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Javier
2011-7-27
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1 个评论
Walter Roberson
2011-7-27
onCleanup() should go just after you have created the conditions that need to be cleaned up later -- e.g., just after you have opened the pool.
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