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

In a low level language (C, C++ or whatever): I have the choice in between either having a bunch of mutexes (like what pthread gives me or whatever the native system library provides) or a single one for an object. ...
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Are there any worse sorting algorithms than Bogosort (a.k.a Monkey Sort)? [closed]

My co-workers took me back in time to my University days with a discussion of sorting algorithms this morning. We reminisced about our favorites like StupidSort , and one of us was sure we had seen a sort algorithm that was O(n!) . That got me started looking around for the "worst" sorting algor...
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How should strace be used?

A colleague once told me that the last option when everything has failed to debug on Linux was to use strace . 12 Answers ...
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Throw keyword in function's signature

What is the technical reason why it is considered bad practice to use the C++ throw keyword in a function signature? 7 An...
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Is it possible to update a localized storyboard's strings?

I localized a part of my application with creating a base.lproj storyboard and 3 string files for it. It was a month ago and after that I added new view controller to app, but this controller's buttons and labels not appear in string files ...
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Convert dmesg timestamp to custom date format

I am trying to understand the dmesg timestamp and find it hard to convert that to change it to java date/custom date format. ...
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Is Javascript a Functional Programming Language?

Just because functions are first class objects, there are closures, and higher order functions, does Javascript deserve to be called a Functional Programming language? The main thing I think it lacks is Pure Functions, and it doesn't 'feel' like other functional languages, like lisp (although thats...
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Cron job every three days

Is it possible to run a cronjob every three days? Or maybe 10 times/month. 11 Answers ...
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Git commit with no commit message

How can I commit changes without specifying commit message? Why is it required by default? 9 Answers ...
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What is the correct way to restore a deleted file from SVN?

I deleted a file from a repo and now want to put it back. The best I can figure out is to: 9 Answers ...