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What is the difference between user and kernel modes in operating systems?

... CPU instruction and reference any memory address. Kernel mode is generally reserved for the lowest-level, most trusted functions of the operating system. Crashes in kernel mode are catastrophic; they will halt the entire PC. User Mode In User mode, the executing code has no abili...
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SQL UPDATE SET one column to be equal to a value in a related table referenced by a different column

... Without the update-and-join notation (not all DBMS support that), use: UPDATE QuestionTrackings SET QuestionID = (SELECT QuestionID FROM AnswerTrackings WHERE AnswerTrackings.AnswerID = QuestionTrackings.AnswerID) ...
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CSS selector with period in ID

The HTML spec allows for periods (.) in an id: 2 Answers 2 ...
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Python Git Module experiences? [closed]

.../kennethreitz/legit/blob/develop/legit/scm.py – forivall Sep 17 '12 at 17:17 9 Based on this answ...
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How can I use “sizeof” in a preprocessor macro?

.... Following snippets will produce no code if sizeof(someThing) equals PAGE_SIZE; otherwise they will produce a compile-time error. 1. C11 way Starting with C11 you can use static_assert (requires #include <assert.h>). Usage: static_assert(sizeof(someThing) == PAGE_SIZE, "Data structure do...
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Initializing a static std::map in C++

... Every time I see something like that done with C++, I think of all the horrendous template code that must be behind it. Good example! – Greg Hewgill Sep 26 '08 at 10:22 ...
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How can one display images side by side in a GitHub README.md?

...refer to specify the image as a percentage of the total width, e.g. width="32%" when aligning 3 images – Igor Fobia Jun 26 at 13:42 add a comment  |  ...
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Storing sex (gender) in database

... I'd call the column "gender". Data Type Bytes Taken Number/Range of Values ------------------------------------------------ TinyINT 1 255 (zero to 255) INT 4 - 2,147,483,...
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dismissModalViewControllerAnimated deprecated

... The word modal has been removed; As it has been for the presenting API call: [self presentViewController:vc animated:NO completion:nil]; The reasons were discussed in the 2012 WWDC Session 236 - The Evolution of View Controllers on iOS Video. Essentially, view controllers presented by this API...
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What's the difference between BaseAdapter and ArrayAdapter?

... Here is the difference: BaseAdapter is a very generic adapter that allows you to do pretty much whatever you want. However, you have to do a bit more coding yourself to get it working. ArrayAdapter is a more complete implementation that works well for data in arrays or ArrayLists. Similarly,...