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What's the difference between deadlock and livelock?

Can somebody please explain with examples (of code) what is the difference between deadlock and livelock ? 7 Answers ...
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How to identify numpy types in python?

How can one reliably determine if an object has a numpy type? 6 Answers 6 ...
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How to convert a Drawable to a Bitmap?

I would like to set a certain Drawable as the device's wallpaper, but all wallpaper functions accept Bitmap s only. I cannot use WallpaperManager because I'm pre 2.1. ...
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How was the first compiler written?

I heard about the chicken and the egg and bootstrapping. I have a few questions. 6 Answers ...
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PHP append one array to another (not array_push or +)

How to append one array to another without comparing their keys? 12 Answers 12 ...
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What is an application binary interface (ABI)?

I never clearly understood what an ABI is. Please don't point me to a Wikipedia article. If I could understand it, I wouldn't be here posting such a lengthy post. ...
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Does Swift have access modifiers?

In Objective-C instance data can be public , protected or private . For example: 17 Answers ...
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INNER JOIN vs LEFT JOIN performance in SQL Server

I've created SQL command that uses INNER JOIN on 9 tables, anyway this command takes a very long time (more than five minutes). So my folk suggested me to change INNER JOIN to LEFT JOIN because the performance of LEFT JOIN is better, despite what I know. After I changed it, the speed of query got si...
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How to validate an Email in PHP?

How can I validate the input value is a valid email address using php5. Now I am using this code 7 Answers ...
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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?

Following on from this question , can someone explain the following in Scala: 4 Answers ...