Re: Thread safe issue in string operation - C# Discussion Boards

George_George5-Jan-09 22:42

5-Jan-09 22:42

Thanks moon_stick,

I agree with the conclusion. My question is about why. Smile | :)

I think the reason why all methods of string class are thread safe is because string is immutable, i.e. when the string is modified, a new instance is created. Agree or?

regards,
George

moon_stick6-Jan-09 0:34

moon_stick

6-Jan-09 0:34

Immutable objects are inherently thread safe but it's quite possible for an object to be thread safe without being immutable.

I'm done answering questions on this topic now - go and search on google (thread safety) or MSDN if you want more detail.

It definitely isn't definatley

George_George6-Jan-09 0:40

6-Jan-09 0:40

Thanks moon_stick,

I appreciate your help. Smile | :)

My question is for the root cause why string is thread safe, is it because string is immutable (i.e. every update operation on string will create a new instance.)?

(MSDN does not answer this.)

regards,
George

moon_stick6-Jan-09 0:45

moon_stick

6-Jan-09 0:45

As I stated in my last answer, strings are thread safe because strings are immutable and immutable objects are thread safe.

I can't see a valid reason why you'd actually need to know this information anyway (and quite franky, don't care so don't bother telling me).

Now leave me alone before I lose my temper.

It definitely isn't definatley

George_George10-Jan-09 2:42

10-Jan-09 2:42

Thanks moon_stick,

Sorry for any inconvenience. I like to study internals and find why besides just the rules. Smile | :)

It is good that we find the root reason why string class is thread safe because it is immutable.

regards and have a good weekend,
George

J4amieC5-Jan-09 4:19

5-Jan-09 4:19

Im surprised that after being told coutless times to read the docs before asking a question you still don't bother. However this does not change the reality that you still don't.

Do you see how this applies to the current situation?

George_George5-Jan-09 22:43

5-Jan-09 22:43

Thanks J4amieC,

I agree with the conclusion. My question is about why.

I think the reason why all methods of string class are thread safe is because string is immutable, i.e. when the string is modified, a new instance is created. Agree or?

regards,
George

led mike5-Jan-09 5:10

led mike

5-Jan-09 5:10

moon_stick wrote:
Did you not even look at the link I sent you?!

Are you not familiar with George? Yes, he is an odd one, although not sure "odd" does him justice. I believe he has some crazy job that pays him by the number of internet forum posts he makes.

moon_stick wrote:
I'm sure I should be flattered but given that Microsoft wrote the class, I'd probably believe their documentation over anything I have to say.

Do not expect George to understand even the simplest things from any documentation. Oh and, good luck.

led mike

moon_stick5-Jan-09 5:27

moon_stick

5-Jan-09 5:27

led mike wrote:
Are you not familiar with George?

That was my first encounter - I think I get the idea already...!! Laugh | :laugh:

It definitely isn't definatley

George_George5-Jan-09 22:45

5-Jan-09 22:45

I am asking why but you are talking about conclusion. Here is why we have mis-understanding. Smile | :)

You can read here.

http://www.codeproject.com/script/Forums/View.aspx?fid=1649&msg=2867111[^]

regards,
George

George_George5-Jan-09 22:44

5-Jan-09 22:44

Any comments to,

http://www.codeproject.com/script/Forums/View.aspx?fid=1649&msg=2867111[^]

Smile | :)

regards,
George

Abhijit Jana5-Jan-09 2:40

Abhijit Jana

5-Jan-09 2:40

Check Thread Safe Section[^]

cheers,
Abhijit

George_George5-Jan-09 3:30

5-Jan-09 3:30

Thanks Abhijit,

It talks about the general thread safety rule, not about my specific question about thread safety for string. Smile | :)

Any new ideas or comments?

regards,
George

Abhijit Jana5-Jan-09 4:08

Abhijit Jana

5-Jan-09 4:08

George_George wrote:
It talks about the general thread safety rule

Yes, That true. but it could also clear your doubts . Any way hope now your have got your answer.

cheers,
Abhijit

George_George5-Jan-09 22:41

5-Jan-09 22:41

Thanks Abhijit,

I think all string operations are thread-safe. Since when we modify a string, a new string instance will be created. Do you think it is correct? Smile | :)

regards,
George

Abhijit Jana6-Jan-09 0:55

Abhijit Jana

6-Jan-09 0:55

George_George wrote:
Do you think it is correct?

Yes !!!

cheers,
Abhijit
CodeProject.Com MVP

George_George10-Jan-09 2:43

10-Jan-09 2:43

Thanks Abhijit MVP!

regards,
George

J4amieC5-Jan-09 2:47

5-Jan-09 2:47

Thats 2 more "read the docs" answers for you. That makes your tally, what, like a couple of thousand now?

George_George5-Jan-09 3:28

5-Jan-09 3:28

Thanks J4amieC,

After some reading the investigation, I think my understanding is correct. Do you agree? Smile | :)

regards,
George

J4amieC5-Jan-09 3:33

5-Jan-09 3:33

Yes, and no. Mostly yes, but partially no.

George_George5-Jan-09 3:40

5-Jan-09 3:40

More details please? Smile | :)

regards,
George

J4amieC5-Jan-09 4:17

5-Jan-09 4:17

no!

George_George5-Jan-09 22:43

5-Jan-09 22:43

I think the reason why all methods of string class are thread safe is because string is immutable, i.e. when the string is modified, a new instance is created. Agree or?

regards,
George

Jon Rista6-Jan-09 11:53

Jon Rista

6-Jan-09 11:53

OMG dude...you already have the friggin answer.

You've been told the answer is correct several times already.
Your request for agreement has been fulfilled already.
WHAT MORE CAN YOU POSSIBLY EXPECT?

WTF | :WTF:

George_George10-Jan-09 2:44