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Re: Subject : locks, semaphores, and such [message #29027]

Wed, 30 January 2002 03:55

Nigel Wade
Messages: 286
Registered: March 1998

Senior Member

Ken Mankoff wrote:

> On Tue, 29 Jan 2002, Nigel Wade wrote:

>>>
>> If you're going to spawn a process, why not base the directory name on
>> the PID of the spawned process, and return the directory name to IDL? Two
>> concurrent processes cannot have the same PID.
>>
>
> This would work too... a brief expriment tells me that I do not know
> how to capture a pid through IDL. Do you have any ideas (or code? :)
>
> Thanks,
> Ken Mankoff
>

Do you need to know the PID in IDL? I'd just return the directory name
created by the spawned process. Output sent to stdout by a spawned process
is returned to IDL in the final argument to the SPAWN command:

>> spawn,'echo hello',result

would return the output 'hello' in the variable result. So all you would
need to do is echo the name of the directory created (and make sure that's
all that the spawned process outputs) and you get what you need.

--
-----------------------------------------------------------
Nigel Wade, System Administrator, Space Plasma Physics Group,
University of Leicester, Leicester, LE1 7RH, UK
E-mail : nmw@ion.le.ac.uk
Phone : +44 (0)116 2523568, Fax : +44 (0)116 2523555

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[Message index]

		Re: Subject : locks, semaphores, and such By: Nigel Wade on Wed, 30 January 2002 03:55
		Re: Subject : locks, semaphores, and such By: Craig Markwardt on Tue, 29 January 2002 19:25
		Re: Subject : locks, semaphores, and such By: Ken Mankoff on Tue, 29 January 2002 09:20
		Re: Subject : locks, semaphores, and such By: Nigel Wade on Tue, 29 January 2002 08:42
		Re: Subject : locks, semaphores, and such By: Ken Mankoff on Tue, 29 January 2002 07:32
		Re: Subject : locks, semaphores, and such By: Martin Downing on Tue, 29 January 2002 05:28
		Re: Subject : locks, semaphores, and such By: Ken Mankoff on Mon, 28 January 2002 09:17
		Re: Subject : locks, semaphores, and such By: Paul van Delst on Mon, 28 January 2002 07:25
		Re: Subject : locks, semaphores, and such By: Ken Mankoff on Wed, 30 January 2002 15:18

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