JeremyP questions

JeremyP answers

• how to define 2x2 array in ios?
• Enable incoming connections from specified IP-address only
• Get and set owner, group and permissions in Cocoa
• Why can my Swift app not be built with xcodebuild, but it can be built with XCode?
• The posix C write() and thread-safety
• Compilation issue when using blocks with LLVM GCC 4.2
• questions around synchronization in java; when/how/to what extent
• Bitwise carry applications
• Objective-C: static field and implementing singleton pattern
• is there way to check if performSelector:withObject:afterDelay: has been registered?