This was answered by [Mr. Jon Skeet][1] on another [site][2].

Quote from Post

&gt; It&#39;s the equivalent to putting lock(this) round the whole method call.

The post has more example code.


  [1]: https://stackoverflow.com/users/22656/jon-skeet
  [2]: http://bytes.com/topic/c-sharp/answers/253333-does-methodimpl-methodimploptions-synchronized-lock-entire-object#post1021344

For static methods it&#39;s the same as: 

    public class MyClass
    {
        public static void Method()
        {
            lock(typeof(MyClass))
            {
               MethodImpl();
            }
        }
    }

http://social.msdn.microsoft.com/Forums/en-US/b6a72e00-d4cc-4f29-a6a0-b27551f78b9b/methodimploptionssynchronized-vs-lock

Yes it is.
See [MethodImplOptions Enumeration][1]


  [1]: http://msdn.microsoft.com/en-us/library/system.runtime.compilerservices.methodimploptions.aspx

I have done a ModelForm adding some extra fields that **are not** in the model. I use these fields for some calcualtions when saving the form.

The extra fields appear on the form and they are sent in the POST request when uploading the form. The problem is they are not added to the `cleaned_data` dictionary when I validate the form. How can I access them?

Django ModelForm with extra fields that are not in the model

I have a long-living application with frequent memory allocation-deallocation. Will any `malloc` implementation return freed memory back to the system?

What is, in this respect, the behavior of:

 - ptmalloc 1, 2 (glibc default) or 3
 - dlmalloc 
 - tcmalloc (google threaded malloc)
 - solaris 10-11 default malloc and mtmalloc
 - FreeBSD 8 default malloc (jemalloc)
 - Hoard malloc?

### Update ###
If I have an application whose memory consumption can be very different in daytime and nighttime (e.g.), can I force any of `malloc`&#39;s to return freed memory to the system? 

Without such return freed memory will be swapped out and in many times, but such memory contains only garbage.

Will malloc implementations return free-ed memory back to the system?

What does `MethodImplOptions.Synchronized` do? 

Is the code below

    [MethodImpl(MethodImplOptions.Synchronized)]
    public void Method()
    {
        MethodImpl();
    }

equivalent to 

    public void Method()
    {
        lock(this)
        {
            MethodImpl();
        }
    }



What does MethodImplOptions.Synchronized do?

What does <code>MethodImplOptions.Synchronized</code> do?
Is the code below
<pre><code class="hljs language-csharp">[MethodImpl(MethodImplOptions.Synchronized)]
public void Method()
{
 MethodImpl();
}
</code></pre>
equivalent to
<pre><code class="hljs language-csharp">public void Method()
{
 lock(this)
 {
 MethodImpl();
 }
}
</code></pre>

Is there a Page.Refresh type of command to refresh a page?

I don&#39;t want to redirect to the page or refresh in JavaScript.


Refresh Page C# ASP.NET

What is marshalling and why do we need it?

I find it hard to believe that I cannot send an `int` over the wire from C# to C and have to marshall it. Why can&#39;t C# just send the 32 bits over with a starting and terminating signal, telling C code that it has received an `int`?

&lt;sub&gt;If there are any good tutorials or sites about why we need marshalling and how to use it, that would be great.&lt;/sub&gt;

Marshaling – what is it and why do we need it?

Let&#39;s say I wanted to create a static text file which ships with each release. I want the file to be updated with the version number of the release (as specified in `AssemblyInfo.cs`), but I don&#39;t want to have to do this manually.

I was hoping I could use a post-build event and feed the version number to a batch file like this:

    call foo.bat $(AssemblyVersion)

However I can&#39;t find any suitable variable or macro to use. 

Is there a way to achieve this that I&#39;ve missed?


Determine assembly version during a post-build event

Can someone describe what the difference between the two are for my project.

Currently I have a `List&lt;MyClass&gt;` and set the BindingSource to that and a DataGridView to the BindingSource.

I have implemented `IEditableObject` so when CancelEdit is called I revert my object back to what it was with a `Memberwise.Clone()`

Will changing my List to a BindingList solve any of this and what are the advantages of using a BindingList?

List&lt;T&gt; vs BindingList&lt;T&gt; Advantages/DisAdvantages

I&#39;ve been using the `Split()` method to split strings, but this only appears to work if you are splitting a string by a character. Is there a way to split a `string`, with another string being the split by parameter?

I&#39;ve tried converting the splitter into a character array, with no luck.

In other words, I&#39;d like to split the `string`:

&gt; THExxQUICKxxBROWNxxFOX

by `xx`, and return an array with values:

&gt; THE, QUICK, BROWN, FOX


Split a string by another string in C#

Does anybody know of a way to lock down individual threads within a Java process to specific CPU cores (on Linux)? I&#39;ve done this in C, but can&#39;t find how to do this in Java. My instincts are that this will require a JNI call, but I was hoping someone here might have some insight or might have done it before.

Thanks!

Java thread affinity

I&#39;m trying to use Java&#39;s `ThreadPoolExecutor` class to run a large number of heavy weight tasks with a fixed number of threads. Each of the tasks has many places during which it may fail due to exceptions.

I&#39;ve subclassed `ThreadPoolExecutor` and I&#39;ve overridden the `afterExecute` method which is supposed to provide any uncaught exceptions encountered while running a task. However, I can&#39;t seem to make it work.

For example:

    public class ThreadPoolErrors extends ThreadPoolExecutor {
    	public ThreadPoolErrors() {
    		super(	1, // core threads
    				1, // max threads
    				1, // timeout
    				TimeUnit.MINUTES, // timeout units
    				new LinkedBlockingQueue&lt;Runnable&gt;() // work queue
    		);
    	}
    	
    	protected void afterExecute(Runnable r, Throwable t) {
    		super.afterExecute(r, t);
    		if(t != null) {
    			System.out.println(&quot;Got an error: &quot; + t);
    		} else {
    			System.out.println(&quot;Everything&#39;s fine--situation normal!&quot;);
    		}
    	}
    	
    	public static void main( String [] args) {
    		ThreadPoolErrors threadPool = new ThreadPoolErrors();
    		threadPool.submit( 
    				new Runnable() {
    					public void run() {
    						throw new RuntimeException(&quot;Ouch! Got an error.&quot;);
    					}
    				}
    		);
    		threadPool.shutdown();
    	}
    }

The output from this program is &quot;Everything&#39;s fine--situation normal!&quot; even though the only Runnable submitted to the thread pool throws an exception. Any clue to what&#39;s going on here?

Thanks!

Handling exceptions from Java ExecutorService tasks

In MSDN, the description of the Thread.Abort() method says: &quot;Calling this method **usually** terminates the thread.&quot; 

Why not ALWAYS? 

In which cases it doesn&#39;t terminate the thread? 

Are there any other possibility to terminate threads?

C# Thread Termination and Thread.Abort()

I want to run a thread for some fixed amount of time. If it is not completed within that time, I want to either kill it, throw some exception, or handle it in some way. How can it be done?

One way of doing it as I figured out from [this thread](http://groups.google.com.br/group/comp.lang.java.programmer/msg/0fea9dd5f0117a7f)
is to use a TimerTask inside the run() method of the Thread.

Are there any better solutions for this?

&amp;nbsp;  
EDIT: Adding a bounty as I needed a clearer answer. The ExecutorService code given below does not address my problem. Why should I sleep() after executing (some code - I have no handle over this piece of code)? If the code is completed and the sleep() is interrupted, how can that be a timeOut?

The task that needs to be executed is not in my control. It can be any piece of code. The problem is this piece of code might run into an infinite loop. I don&#39;t want that to happen. So, I just want to run that task in a separate thread. The parent thread has to wait till that thread finishes and needs to know the status of the task (i.e whether it timed out or some exception occured or if its a success). If the task goes into an infinite loop, my parent thread keeps on waiting indefinitely, which is not an ideal situation.

How to timeout a thread

Yes, I have read many materials related to operating system. And I am still reading. But it seems all of them are describing the process and thread in a &quot;abstract&quot; way, which makes a lot of high level elabration on their behavior and logic orgnization. **I am wondering what are they *physically*?** In my opinion, they are just some in-memory &quot;data structures&quot; which are maintained and used by the kernel codes to facilitate the execution of program. For example, operating system use *some process data structure (PCB)* to describe the aspects of the process assigned for a certain program, such as its priority, its address space and so on.  Is this all right?

Content Type	Original Author	Original Content on Stackoverflow
Question	Amitabh	View Question on Stackoverflow
Solution 1 - .Net	David Basarab	View Answer on Stackoverflow
Solution 2 - .Net	Rico Suter	View Answer on Stackoverflow
Solution 3 - .Net	Michael Stoll	View Answer on Stackoverflow

What does MethodImplOptions.Synchronized do?

.Net Problem Overview

.Net Solutions

Solution 1 - .Net

Solution 2 - .Net

Solution 3 - .Net

Will malloc implementations return free-ed memory back to the system?

Django ModelForm with extra fields that are not in the model

Attributions