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Re: Subject : locks, semaphores, and such [message #29042 is a reply to message #29041]

Tue, 29 January 2002 08:42

Nigel Wade
Messages: 286
Registered: March 1998

Senior Member

Ken Mankoff wrote:

> On Tue, 29 Jan 2002, Martin Downing wrote:
>> "Ken Mankoff" <mankoff@I.HATE.SPAM.cs.colorado.edu> wrote in message
>>> [ snip ]
>>> Actually, you gave me a very good solution. I will append the users IP
>>> address to the directory. That way, I only have to worry about users
>>> from the same IP accessing the page in the same second. This is much
>>> less likely. Also, rather than use SYSTIME( 1 ) to get the seconds, I
>>> will use a millisecond timestamp.
>>
>> Systime(1) seems to have a resolution of roughly 10 milliseconds (at
>> least on my system). Whats the timestamp you are thinking of which gives
>> millisecond steps?
>
> I get 1 second resolution (I think) using the IDL systime(1) command.
> I had not yet found a way in IDL to get higher resolution timestamps,
> and am currently looking into getting them from a spawned command in
> unix.
>
> Ken Mankoff
>

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.

--
-----------------------------------------------------------
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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