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Re: Subject : locks, semaphores, and such [message #29031 is a reply to message #29027]

Tue, 29 January 2002 19:25

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Ken Mankoff <mankoff@I.HATE.SPAM.cs.colorado.edu> writes:
> 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.

I believe there was a "bug" in some versions of IDL 5.2 for Linux
which caused SYSTIME(1) to only return integer values. Do you have
that version? RSI was making a version called 5.2.1L available, or
something like that, which fixed the problem.

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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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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