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Monday, December 01, 2008 8:00 AM

ThreadPool.BindHandle

I mentioned that we can use ThreadPool.BindHandle to implement asynchronous IO. Here are roughly the steps necessary to make it happen: 1. Create an overlapped file handle SafeFileHandle handle = CreateFile( filename, Win32.GENERIC_READ_ACCESS, Win32.FILE_SHARE_READ
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Monday, November 24, 2008 8:00 AM

ThreadPool.UnsafeQueueNativeOverlapped

CLR’s thread pool has two pools of threads. The first pool is used by ThreadPool.QueueUserWorkItem . The second pool is an IoCompletionPort thread pool used by ThreadPool.BindHandle and ThreadPool.UnsafeQueueNativeOverlapped . ThreadPool.BindHandle is
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Monday, August 11, 2008 8:00 AM

Conversion between System.String and char *

We can convert a char * to System.String with System.String’s constructor string str = new string((char*)p); And for the reverse: fixed(char *p = str){} Why do we care about conversion between System.String and char *? From this article , this is the
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Monday, July 21, 2008 8:00 AM

Managed ThreadPool vs Win32 ThreadPool (pre-Vista)

The following is a conversation between me and a CLR dev. The conversation is very informative so I quote it here. From: Sent: To: Subject: RE: ThreadPool.QueueUserWorkItem There might be some confusion here around the meaning of the term "I/O Thread."
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Monday, April 28, 2008 8:00 AM

Event Handles “leak”

On our stress run, we saw our process’ handle count steadily increases until certain point, then it stabilizes. However the number of handles is high. Most of those handles are Event handles. We are concerned about it. So we went off and did some investigation.
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Monday, April 14, 2008 8:00 AM

Consider Creating a new class for locking

C# provides keyword lock for synchronized access. A good practice is to create a private object for locking purpose. For example, public class LockExample { private object syncObject = new object (); public void SynchronizedMethod() { lock (syncObject)
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Monday, April 07, 2008 8:00 AM

A case study of a NullReferenceException

We are seeing a NullReferenceException in our stress program. The investigation process may be helpful to some folks. Thread 22 is showing a Watson dialog. This is a register corruption. 0:022> kp ChildEBP RetAddr 091bc9a0 76961220 ntdll!ZwWaitForSingleObject(void)+0x15
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Monday, March 24, 2008 8:00 AM

App Config’s root element should be namespace-less

The root element for Application config file is <configuration> <?xml version="1.0" encoding="utf-8" ?> <configuration > </configuration> The application config file is shared with CLR and Windows SxS. SxS dictates
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Monday, February 25, 2008 8:00 AM

Calculating the size of each GC generation

Sos.dll does not have a command to tell the size of each GC generation. However, you can calculate the size based on the output of !eeheap -gc. For example, 0:000> !eeheap -gc Number of GC Heaps: 1 generation 0 starts at 0x1da6c430 generation 1 starts
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Thursday, February 21, 2008 8:00 AM

Figuring out object allocation graph from a managed memory dump

when debugging a managed memory dump, we can use Sos.dll to inspect managed objects inside the dump. for example, we can do !dumpheap to list the managed objects in GC Heap, we can also use !gcroot to figure out the reference path to a particular object.
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Monday, January 28, 2008 8:00 AM

Reverse P/Invoke and exception

P/Invoke is managed code executing a native function pointer. And Reverse P/Invoke is native code executing a managed delegate as a function pointer, mostly as a callback. When the native code executes the managed delegate function pointer, the call really
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Monday, November 12, 2007 8:00 AM

Assembly Loading and Authorization

CLR does not do anything special regarding authorization during assembly loading. It will try to access the file under the current user. However, if an assembly is already loaded, next time when the assembly is requested, CLR will return the assembly
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Monday, August 13, 2007 8:00 AM

Loading CLR DAC dll from a different path

From .Net framework 2.0, CLR creates a debugger helper dll mscordacwks.dll. The dll is used by Windows Debugger to enumerate CLR data structures. Mscordacwks.dll is part of .Net framework redist. C:\Windows\Microsoft.NET\Framework\v2.0.50727>dir mscordacwks.dll
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Monday, August 06, 2007 8:00 AM

The Unusual Ref/Def Mismatch FileLoadException

One of my colleagues has experienced a very strange Ref/Def Mismatch FileLoadException (The located assembly's manifest definition does not match the assembly reference). After a long investigation, we finally track down the cause. To explain the problem,
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Monday, August 06, 2007 12:18 AM

The sequence of interactions between CLR loader and fusion during Assembly.Load

The following describes roughly the sequence of interactions between CLR loader and fusion during Assembly.Load() in .Net framework 2.0. 1. User calls Assembly.Load. 2. Loader pass the assembly reference to fusion. 3. Fusion checks to see if the assembly
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