.NET Threads taking CPU time while suspended - .NET (Core and Framework) Discussion Boards

VS 2003 IDE issue

matthias s.4-Nov-05 1:56

4-Nov-05 1:56

Hi there,

didn't know where exactly to post this. Hope it's ok here.

I'm just wondering, whether there is a possibility to include/exclude files in different build configurations. Say in Release config, I'd like to distribute this set of *.sql, *.txt and *.config files and in Debug config, there are just different files to go. Any ideas?

Any help is greatly appreciated.

/matthias

I love deadlines. I like the whooshing sound they make as they fly by.
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UrlEditor doesn't display in design time

smoitry3-Nov-05 22:50

smoitry

3-Nov-05 22:50

Hi All,

I've tried to add the UrlEditor window to a property for a custom control I created.

Here is my code :

[
	Category("Data"),
	Description("URL associated with the link."),
	DefaultValue(""),
	EditorAttribute(typeof(System.Web.UI.Design.UrlEditor), typeof(System.Drawing.Design.UITypeEditor))
]
public string urldata
{
	get
	{
		return urlData;
	}
	set
	{
		urlData = value;
	}
}

Then, when I use my custom control, I have the urldata property, I can write any string I want into it, I also see the "..." button at the right, but nothing appears when I click on it.

What did I wrong ? Why does this UrlEditor not show up ?

Thanks ! Stéphane.

file monitoring low level

UgoDeschamps3-Nov-05 6:40

UgoDeschamps

3-Nov-05 6:40

Hi all,
Im looking for a way (.net or not) to monitor file access and permit access to certain application to it...

I want to be able to get an event saying (this file) tries to do "this" to this file

Acess - Deny

Thanks

Re: file monitoring low level

Dave Kreskowiak3-Nov-05 14:05

Dave Kreskowiak

3-Nov-05 14:05

You can check out FileMon on www.SysInternals.com. It uses a custom .DLL to do something very similar. There's no source, but there is a discussion of how it's done. Be warned, it requires a black-belt in NTFS Internals to write it...

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Insert Line of Text in Text File

Rabbit173-Nov-05 6:08

Rabbit17

3-Nov-05 6:08

Anyone know a straight foward way to insert a string at the beginning of a text file that already has data in it? I thought there was an insert function in the StreamWriter, but apparently not.

For my purpose, the insert will always be at the beginning of the file and it doesn't matter if the first line is overwritten or not.

Thanks,
RABB17

Know thy limits, then add 1.

Re: Insert Line of Text in Text File

Rabbit173-Nov-05 7:31

Rabbit17

3-Nov-05 7:31

Figured it out. It was in the FileStream, not the StreamWriter. If anyone ever needs to do this:

System.IO.FileStream f = SupportClass.RandomAccessFileSupport.CreateRandomAccessFile(MyApp.playFileName, "rw");
int fileLength = f.Length;
line = "This is written in front of this many characters: " + fileLength.ToString();
f.Seek(0, System.IO.SeekOrigin.Begin);
//insert blank line at top of file
SupportClass.RandomAccessFileSupport.WriteBytes("/n", f);
//return to top of file
f.Seek(0, System.IO.SeekOrigin.Begin);
SupportClass.RandomAccessFileSupport.WriteBytes(line, f);
//return to end of file
f.Seek(f.Length, System.IO.SeekOrigin.Begin);
f.Close();

Re: Insert Line of Text in Text File

Dave Kreskowiak3-Nov-05 14:03

Dave Kreskowiak

3-Nov-05 14:03

Yeah, to do a true insert of text into the file, you must rewrite the entire file. There's no other way to do it.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

.NET Threads taking CPU time while suspended

khariv2-Nov-05 22:58

khariv

2-Nov-05 22:58

I am running into a very frustrating problem with an application which works with threads.

Basically, what I am doing is creating a number of threads which I use for executing procedures. I cannot use the thread pool as the application does not suit itself to that sort of methodology (I will need to have greater control over the individual threads). For this reason, I am creating threads and keeping them around until I need them and then using them as needed.

Anyway, what I am seeing is that, if I have my threadStart procedure use a "while not terminated" type loop, the thread takes up lots of CPU time. For example, here is the ThreadStart:
private void doSomething()
{
while (fKillThread != true)
{
doSomethingElse()
System.Threading.Thread.CurrentThread.Suspend();
}
}

In theory, this should run ONCE and then suspend itself and take no further CPU time. However that is definitely not the case. Instead, these threads peg the CPU at 100%. It is almost as if it is continuously evaluating the while condition instead of doing it once and suspending.

So, why does .NET Thread.Suspend() not actually put the thread to sleep until it is called inside of a while loop?

If I eliminate the while loop and just call suspend(), it suspends and takes no CPU time at all.

Can anyone shed some light on what is going on here?

thanks

[edit]

I found this post that looks like the same thing is happening:
http://www.highdots.com/forums/visual-studio-net-debugging/thread-suspend-causes-100-cpu-2194189.html

this was from back in 2003 - anyone know if it was ever fixed or is .NET threading just broken until I upgrade to 2.0? Is it fixed there???
khariV

-- modified at 5:02 Thursday 3rd November, 2005

Re: .NET Threads taking CPU time while suspended

akyriako782-Nov-05 23:56

akyriako78

2-Nov-05 23:56

I checked you code in 2.0. Besides the fact that Thread.Suspend() is Obsolete is working fine and you have no CPU penalty.

Re: .NET Threads taking CPU time while suspended

khariv3-Nov-05 5:32

khariv

3-Nov-05 5:32

thanks for the check. While I'm not sure when we'll officially move over to 2.0, it's good to know that when we do this issue will no longer be a problem.

You say that Thread.Suspend() is obsolete - what is the new methodology for suspending threads? Do they recommend you create/free them all the time (Im going to have potentially LOTS of processes, so I figured this would be a lot of overhead).

I know I can avoide using suspend() and instead switch over to events, but is there a new and improved thinking on this for the 2.0 world?

thanks again
khariV

Re: .NET Threads taking CPU time while suspended

akyriako783-Nov-05 10:25

akyriako78

3-Nov-05 10:25

Check this out

http://msdn.microsoft.com/netframework/programming/obsoleteapi/ObsByNamespace.aspx#System.Threading[^]

Re: .NET Threads taking CPU time while suspended

akyriako782-Nov-05 23:57

akyriako78

2-Nov-05 23:57

If you have to use 1.1 try to set your thread as background one.This may eliminate the cpu consumption inside the loop.just a thought.

Re: .NET Threads taking CPU time while suspended

S. Senthil Kumar3-Nov-05 1:02

S. Senthil Kumar

3-Nov-05 1:02

Based on the link you gave, it looks like Thread.Suspend is buggy. How about using some other mechanism to suspend and wakeup threads, like ManualResetEvents, for example?

Regards
Senthil
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OnPaintBackground isn't getting called

OlliesDad2-Nov-05 12:21

OlliesDad

2-Nov-05 12:21

Hello,

I've created a subclass of the Button class and I can't figure out why my OnPaintBackground method never gets called. Have any of you ever encountered this problem?

Gus

Re: OnPaintBackground isn't getting called

OlliesDad2-Nov-05 13:23

OlliesDad

2-Nov-05 13:23

I figured it out:

this->SetStyle(ControlStyles::Opaque, false);

Just FYI...

Gus

PInvokeStackImbalance (Net 2.0)

Angelo Cresta2-Nov-05 3:32

Angelo Cresta

2-Nov-05 3:32

from MS:
The PInvokeStackImbalance managed debugging assistant (MDA) is activated when the CLR detects that the stack depth after a platform invoke call does not match the expected stack depth given the calling convention specified in the DllImportAttribute attribute as well as the declaration of the parameters in the managed signature...
ok, understood, by my code is:

Friend NotInheritable Class NativeMethods
Private Sub New()

End Sub

Declare Function GetKeyState Lib "user32" Alias "GetKeyState" (ByVal _
nVirtKey As Long) As Integer
End Class

Now, how should I change the parameters to match those MDA is looking for?!?
Already tried to disable MDA via registry, but I think a solution is not covering an error ...

Thanks in advance /// Angel

Re: PInvokeStackImbalance (Net 2.0)

Angelo Cresta3-Nov-05 3:29

Angelo Cresta

3-Nov-05 3:29

I've found!I was sure that nVirtKey was a Long, but It's a Short (MSDN[^])

sorry ...
Angel

Waveform audio interface component for .NET

AdamSlosarski2-Nov-05 1:50

AdamSlosarski

2-Nov-05 1:50

at http://republika.pl/dailybuilds/waveform.html[^] website you can use new .net multimedia library

Testing your code against performance will keep you running with good scalability and maintenance for years.
NTime.exe - the free tool for real developers of high scalability applications!

dotfuscation

D.N.1-Nov-05 20:55

D.N.

1-Nov-05 20:55

What is dotfuscation? and when will you go for it?

Re: dotfuscation

enjoycrack2-Nov-05 6:47

enjoycrack

2-Nov-05 6:47

Hi there

This site will answer u
Dotfuscation

<< >>

IDispose

D.N.1-Nov-05 20:53

D.N.

1-Nov-05 20:53

what is the significance of IDispose Interface?

Re: IDispose

Christian Graus2-Nov-05 13:34

Christian Graus

2-Nov-05 13:34

Any object that holds on to things that need to be cleaned up will impliment IDisposable, and you should call the Dispose method on such items when you're finished with them. Common examples would include pretty much anything in the System.Drawing namespaces, or anything else that holds an unmanaged handle of some sort.

We have this interface because a garbage collected system cannot support deterministic destruction.

Christian Graus - Microsoft MVP - C++

Re: IDispose

Colin Angus Mackay3-Nov-05 1:30

Colin Angus Mackay

3-Nov-05 1:30

To add to what Christian said I would also recomment that you use using{} when you use an object that implements the IDisposable interface and it will naturally go out of scope at the end of the method. For example:

using(SomeDisposableClass disposableInstance = new SomeDisposableClass())
{
    // Do stuff with the disposableInstance
}

When the using block is completed the Dispose() method will be called. It will also clean up the object if an exception is causing the stack to unwind.

My: Blog | Photos

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Re: IDispose

Christian Graus3-Nov-05 11:17

Christian Graus

3-Nov-05 11:17

That's if he's using C#, I don't believe VB.NET supports it.

Christian Graus - Microsoft MVP - C++

Re: IDispose

Leather994-Nov-05 2:52

Leather99

4-Nov-05 2:52

It is supported in VB.NET 2.0, so you will be ok if thats what you are working with.

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