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Re: process monitoring panic
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Re: process monitoring panic


  • Subject: Re: process monitoring panic
  • From: Ken Thomases <email@hidden>
  • Date: Wed, 3 Sep 2008 00:45:43 -0500

On Sep 3, 2008, at 12:03 AM, Paul Archibald wrote:

Okay, this has me stumped. Does Xcode somehow pipe the output of the CLP to my app when it is present, and when its not there that pipe is never "hooked up"?

It is your responsibility to establish the pipe between the subprocess and your application. You need to be doing that explicitly.


This CLP is a major hog, it grabs 85+% of the CPU when it runs, does that make a difference? I thought my app would work better if Xcode was not using half the available memory itself.

Shouldn't matter.


Anyone have any ideas what to look at here? I am using an NSTask wrapper class (TaskWrapper) I adapted from the Moriarity sample to do the sublaunch and monitoring stuff. ( I have a fix for it under Leopard which I will report on later, just to try to put something back into the pot.)

It sounds like your subprocess is buffering its output. See the setvbuf man page. Until the subprocess writes enough to fill its buffer, it won't put anything on the pipe. When the process shuts down, it flushes all of its buffers.


Xcode may have convinced the subprocess that its output is to a tty, which is line buffered rather than block buffered. I'm not sure why that would happen since you are (or should be) controlling the nature of the subprocess's output.

Cheers,
Ken

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 >process monitoring panic (From: Paul Archibald <email@hidden>)

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