Thread.sleep

Uri

I would like to describe the following scenario:

1. Start a thread which write something to the screen every 5 seconds
(the thread uses the sleep method by Thread). current Windows time is
15:00.
2. change the Windows clock backwards. current time is: 14:00.
3. the thread doesn't wake up.
4. wait untill 14:01.
5. change the Windows clock forward to 16:00.
6. the thread wakes up the amount of times it missed in a row (in this
case 20 times).

Are you familier with this behaviour ?
Can you tell us what causes this ?
And the Milion dolar question: How can we overcome this issue ????

Jul 17 '05 #1

Subscribe Post Reply

5770

Ian Shef

bu****@motorola.com (Uri) wrote in
news:6d**************************@posting.google.c om:

I would like to describe the following scenario:

1. Start a thread which write something to the screen every 5 seconds
(the thread uses the sleep method by Thread). current Windows time is
15:00.
2. change the Windows clock backwards. current time is: 14:00.
3. the thread doesn't wake up.
4. wait untill 14:01.
5. change the Windows clock forward to 16:00.
6. the thread wakes up the amount of times it missed in a row (in this
case 20 times).

Are you familier with this behaviour ?
Can you tell us what causes this ?
And the Milion dolar question: How can we overcome this issue ????

I believe that Java keeps track of wakeup times on an absolute basis. Thus,
the thread (step 1) will not wake up until the time is greater than or equal
to 15:00:05. This doesn't occur until Step 5.

I can't explain Step 6, but I don't understand your comment about 20 times.
20 x 5 seconds = 100 seconds, not one minute or one hour or two hours.
--
Ian Shef
These are my personal opinions and not those of my employer.

Jul 17 '05 #2

Similar topics

RELEASED Python 2.3.1

by: Anthony Baxter | last post by:

On behalf of the Python development team and the Python community, I'm happy to announce the release of Python 2.3.1 (final). Python 2.3.1 is a pure bug fix release of Python 2.3, released in...

Python

Thread.Sleep...

by: news.microsoft.com | last post by:

Hi, Currently I have a thread thats spinning and doing a Thread.Sleep(someTime). I was thinking of changing this to Thread.Sleep(Timeout.Infinite); then when I have actual data in a...

.NET Framework

Looking for Advice on Thread.Sleep

by: Cider123 | last post by:

I ran into a situation where my Window Service had to process 100,000+ files, when I first noticed I needed to tweak various routines. Everything runs fine, but here's what I ran into: In the...

C# / C Sharp

runaway thread count and asynchronous sockets

by: Matthew Groch | last post by:

Hi all, I've got a server that handles a relatively high number of concurrent transactions (on the magnitude of 1000's per second). Client applications establish socket connections with the...

C# / C Sharp

Thread.uSleep

by: Matthijs | last post by:

Hi, I have a problem coding a UDP Server/client. The server needs to send big amounts of data over UDP. The problem however is that you can't send as fast as you like. (All packets will be dropped...

C# / C Sharp

Thread.Sleep

by: Chris Dunaway | last post by:

According to the docs, calling Thread.Sleep(0) causes the thread to be "suspended to allow other waiting threads to execute." What happens if I call Thread.Sleep(500)? Do other threads not get a...

Visual Basic .NET

GUI Invoke stalls thread

by: k.mellor | last post by:

Hi, I hope someone can help. I have written a simple form to demonstrate my problem/question. The code follows. The form starts a thread, which using delegates updates a label (Every second...

C# / C Sharp

Thread - Hare and Tortoise Program

by: Buckaroo Banzai | last post by:

Hello, newbie here... I'm writing this program but when I click the start button which should initiate either the Hare or the Tortoise, it does not, this is the first time I use threads, so the...

Java

DataTable in Thread

by: =?Utf-8?B?anAybXNmdA==?= | last post by:

I've got a routine that builds a table using different queries, different SQL Tables, and adding custom fields. It takes a while to run (20 - 45 seconds) so I wrote a thread to handle the table...

C# / C Sharp

Stopping a Thread with Time Slicing

by: Steve | last post by:

Hi All, I've been trying to come up with a good way to run a certain process at a timed interval (say every 5 mins) using the SLEEP command and a semaphore flag. The basic thread loop was always...

Python

Basic Javascript concepts

by: aa123db | last post by:

Variable and constants Use var or let for variables and const fror constants. Var foo ='bar'; Let foo ='bar';const baz ='bar'; Functions function $name$ ($parameters$) { } ...

Javascript

Batch import of multiple excel files into the database

by: ryjfgjl | last post by:

If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...

Data Management

Merging data from multiple Excel files

by: ryjfgjl | last post by:

In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...

Data Management

Migrating Website to Cloud - Emmanuel Katto

by: emmanuelkatto | last post by:

Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel

General

Looking to do Android software development, any suggestions? Is flutter better?

by: nemocccc | last post by:

hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?

General

Is that possible of reading the .csv file in column wise and the column have different lengths ?

by: Sonnysonu | last post by:

This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...

C / C++

How to build RAID in BIOS?

by: Hystou | last post by:

There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...

Computer Hardware

What is ONU?

by: marktang | last post by:

ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...

General

Problem With Comparison Operator <=> in G++

by: Oralloy | last post by:

Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers,...

C / C++