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Simple Singleton Pattern in C#

, 30 Oct 2011
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The problem with alternative 3 and 4 is that it is not multi-threaded.Two threads may check for null, then the two will create the new instance. The race condition only happens at the first accesses. If a single thread accesses the object, then later many threads do the access, there is no...
The problem with alternative 3 and 4 is that it is not multi-threaded.
Two threads may check for null, then the two will create the new instance. The race condition only happens at the first accesses. If a single thread accesses the object, then later many threads do the access, there is no problem, so it is hard to cause that bug... but it is hard to discover it later.
 
EDIT: Sorry. Alternative 3 works well in multi-threaded environments, as it is reading a read-only field that's set during initialization. When I saw it, I got the impression the property was initializing it.

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Paulo Zemek
Architect
Canada Canada
I started to program computers when I was 11 years old, as a hobbist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
 
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do they work easier, faster and with less errors.
 
Want more info or simply want to contact me?
Take a look at: http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
 
Codeproject MVP 2012
Microsoft MVP 2013

Comments and Discussions

 
GeneralReason for my vote of 1 I'm a big fan of alternative 8, that... PinmemberKabwla.Phone6-Nov-11 21:27 

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