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How to start background processes in Python?

Posted on 2014-12-24
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Last Modified: 2014-12-28
Hello,

I'm trying to
  * read a file
  * write some data into a folder
  * start another process to process the data
  * resume reading the file while the process works on the data

Is there a good way to go about doing this? Would it be better than starting a bunch of threads?

The reason I'm thinking about it this way, is that I don't really need the processes to communicate with each other, once started, the processes will be working on their own set of data; and I'm hoping Unix would manage running multiple scripts better than Python would manage threads.

Appreciate any advice on this!
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Question by:Errang Genevre
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by:
käµfm³d   👽 earned 350 total points
ID: 40517414
You spawn a process by invoking the subprocess function.

You have a potential race condition in that the second process won't know exactly when the Python process is done writing the file (unless these are fixed-size files), so you might want to use a convention like writing a zero-byte sentinel file to alert the subprocess as to when the file is done being written. Unless, of course, you won't be kicking off the 2nd process until the Python process finishes writing the file.
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Assisted Solution

by:clockwatcher
clockwatcher earned 150 total points
ID: 40518156
Might be a little overkill for what you're after but it sounds like a good candidate for a message queuing system:  https://www.rabbitmq.com/tutorials/tutorial-two-python.html
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Author Closing Comment

by:Errang Genevre
ID: 40520677
Thanks!
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