Phil Mayers wrote:

Gabriel Rossetti wrote:

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Gabriel Rossetti wrote:

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Hello,

Is there some sort of mutex/semaphore code that can be used in twisted? I need to run an external subprocess from twisted when I get some data from a client and I'd like to make sure that while one client's data spawned the process to run, some other client will not do the same at the same time, thus my need for a mutex. Maybe there is another way to do this in a more twisted sort of way (pun not intended)? If so I'd love to hear how!

Thanks, Gabriel

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Oh, I forgot to say, I use this for the process :

subprocess.call(["festival", "--tts", filename])

You can't do that. The python "subprocess" module is blocking, and yuo will block the reactor and stop Twisted running.

Ok

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I'm not sure if it is useful for anyone, but I just saw that Twisted has some sort of process code too, though it looks a bit complicated for my needs.

You need to use it.

You can use:

twisted.internet.utils.getProcessOutputAndValue

...if you want to just run a simple command

Ok, yes, that is all I need to do, run a simple command.

As for mutex - since Twisted isn't multithreaded, you can just use a flag variable.

Ok, cool, thanks a lot for your help, Gabriel