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How efficient is locking an unlocked mutex? What is the cost of a mutex?

... 123 I have the choice in between either having a bunch of mutexes or a single one for an object...
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How to check if a string is a valid date

I have a string: "31-02-2010" and want to check whether or not it is a valid date. What is the best way to do it? 14 Answ...
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iPad keyboard will not dismiss if modal ViewController presentation style is UIModalPresentationForm

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What's the fastest algorithm for sorting a linked list?

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Overriding !important style

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How to include jar files with java file and compile in command prompt

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adding directory to sys.path /PYTHONPATH

... 182 This is working as documented. Any paths specified in PYTHONPATH are documented as normally c...
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A fast method to round a double to a 32-bit int explained

... 162 A double is represented like this: and it can be seen as two 32-bit integers; now, the int ...
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Is C++ context-free or context-sensitive?

...mmar; unrestricted grammars are Turing-complete. A context-sensitive (Type-1) grammar allows multiple symbols of context on the left hand side of a production, but the same context must appear on the right hand side of the production (hence the name "context-sensitive"). [1] Context-sensitive gramma...
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How to implement an abstract class in ruby?

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