Posts

Nice article about Thread Concurrency and Synchronisation in C++11

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I came across this nice article about modern thread usage patters in C++11:

http://www.baptiste-wicht.com/2012/03/cpp11-concurrency-part1-start-threads/

It has a good summary of the synchronisation primitives available in C++11

GCC, std::thread – type ‘sleep_for’ is not a member of ‘std::this_thread’

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If you are trying to use sleep_for() in the standard C++ thread library via GCC and are getting an error like the following:

 

‘sleep_for’ is not a member of ‘std::this_thread’

 

The you may have to define the following symbol:

 
 _GLIBCXX_USE_NANOSLEEP

More information can be found here.

 

Eclipse CDT – Using boost thread library with eclipse

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If you are scratching your head about how to setup Eclipse and CDT to use the boost thread library then have a look at the first post in this thread:

 

http://www.eclipse.org/forums/index.php/m/787571/

 

It explains which project settings need to be changed.

 

Thanks to Robert!

 

.NET WPF, Set Bitmap – Must create DependencySource on same Thread as the DependencyObject error

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In WPF when you try to assign a bitmap to a property that’s bound to a UI element from a worker thread you may get the following error:

 

“Must create DependencySource on same Thread as the DependencyObject”

 

A simple way around this problem without having to jump through hoops and dispatch to the UI thread is to just freeze the bitmap before assigning it, like this:

 


var bitmap = new BitmapImage(new Uri(CurrentImageFilePath));
bitmap.Freeze();
this.CurrentImage = bitmap;

 

I hope this helps someone who’s stuck with this annoying error!