Synchronized access to std::cout

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When two thread trying to print some text on to the console using std::cout I'm getting some rubbish. How to achieve the synchronized access to std::cout?

T1:

C++

cout<<"Hello World"<<endl;

T2:

C++

cout<<"Hello Universe"<<endl;

I am getting the output something like:
Hello WHello Universe
orld

Any idea?

Posted 1-Feb-11 20:22pm

Giri Ganji

Updated 1-Feb-11 21:55pm

Henry Minute

v2

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Debojyoti Majumder 2-Feb-11 2:24am

Can you share the code that creating the thread??

3 solutions

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-02-01T20:28:00

Solution 1

The simplest way: create a CriticalSection (is it Windows?) and write a separate output function, sandwich its body with EnterCriticalSection and LeaveCriticalSection; output to console only through this function.

Next time: please always indicate your platform in your question. Other detail may include code, exception dump with indication of code lines where exception is thrown, description of what the code does, the goal of application or a technique, etc.

—SA

Posted 1-Feb-11 20:28pm

Sergey Alexandrovich Kryukov

Updated 15-Jul-11 10:11am

v3

Comments

Olivier Levrey 2-Feb-11 3:47am

I agree. If you are running under windows, then the "critical section" is what you are looking for.

Sergey Alexandrovich Kryukov 15-Jul-11 16:09pm

Thank you, Olivier.
--SA

fjdiewornncalwe 2-Feb-11 14:36pm

We have a winner... +5

Sergey Alexandrovich Kryukov 15-Jul-11 16:11pm

Thank you, Marcus.
--SA

Espen Harlinn 2-Feb-11 16:22pm

Good answer, a nice and simple solution - 5+

Sergey Alexandrovich Kryukov 15-Jul-11 16:11pm

Thank you, Espen.
--SA

Espen Harlinn · Accepted Answer · 2011-02-02T10:29:00

Solution 3

If what you are looking for is a flexible logging solution you should take a look at
ACE[^]

It provides a flexible distributed multi-thread aware logging solution, and a bunch of other features that's very useful if you into serious multi-threaded development.

Here is a nice little tutorial[^]

And here is a nice little list of serious projects using ACE and TAO[^]

Regards
Espen Harlinn

Posted 2-Feb-11 10:29am

Espen Harlinn

Comments

Sergey Alexandrovich Kryukov 2-Feb-11 20:26pm

This is good stuff... my 5. Did you read "The Tao of Pooh" after Benjamin Hoff?
http://www.just-pooh.com/tao.html
--SA

Stephen Hewitt · Accepted Answer · 2011-02-01T21:41:00

Solution 2

How did you create the thread? I suspect you used CreateThread[^] and are using the single-threaded C-runtime library.

PS: Don't use CreateThread to create threads!

Posted 1-Feb-11 21:41pm

Stephen Hewitt

Updated 1-Feb-11 21:42pm

v2