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Xcode 6 beta 2 issue exporting .ipa: “Your account already has a valid iOS distribution certificate”

... This is what worked for me. On my machine I kept both Xcode 5 and Xcode 6 beta. From Xcode 6 beta, Archive the project. Close Xcode 6. Open Xcode 5, go to Organizer and export as Ad Hoc build with proper provisioning profile. That's it! ...
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Are static variables shared between threads?

...y the JVM's memory model. Here's an article talking about the memory model and how writes become visible to threads. You can't count on changes one thread makes becoming visible to other threads in a timely manner (actually the JVM has no obligation to make those changes visible to you at all, in an...
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Difference between jar and war in Java

What is the difference between a .jar and a .war file? Is it only the file extension or is there something more? 13 A...
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Why doesn't .NET/C# optimize for tail-call recursion?

...ugh analysis to keep the application competitive in the long term with a standard ahead-of-time compilation. Interestingly the NGen compilation steps are not targeted to being more aggressive in their optimizations. I suspect this is because they simply don't want to have bugs where the behaviour i...
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Why is Thread.Sleep so harmful

...it mentioned that Thread.Sleep(); should not be used, but I can't understand why this is so. If Thread.Sleep(); can cause trouble, are there any alternative solutions with the same result that would be safe? ...
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Single script to run in both Windows batch and Linux Bash?

...rite a single script file which executes in both Windows (treated as .bat) and Linux (via Bash)? 11 Answers ...
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What is the difference between pylab and pyplot? [duplicate]

What is the difference between matplotlib.pyplot and matplotlib.pylab? 1 Answer 1 ...
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What is the difference between g++ and gcc?

What is the difference between g++ and gcc? Which one of them should be used for general c++ development? 10 Answers ...
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Volatile vs. Interlocked vs. lock

...he point of volatile is that multiple threads running on multiple CPUs can and will cache data and re-order instructions. If it is not volatile, and CPU A increments a value, then CPU B may not actually see that incremented value until some time later, which may cause problems. If it is volatile, th...
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What is the difference between Serialization and Marshaling?

...d techniques (such as RPC), the term "Marshaling" is used but don't understand how it differs from Serialization. Aren't they both transforming objects into series of bits? ...