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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...
Thanks, that mostly answers my question. I didn't knew that the kernel (e.g. the Linux kernel) handles mutexes and you control them via syscalls. But as the Linux itself manages the scheduling and context switches, this makes sense. But now I have a rough imagination about wh...
Configuring diff tool with .gitconfig
... the above keys or define a custom key of your own. If you want to setup a new tool altogether(or a newly released version of well-known tool) which doesn't map to any of the keys listed above then you are free to map it to any of keys listed above or to a new custom key of your own.
What if you ha...
MySQL Multiple Joins in one query?
...unction () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f8974328%2fmysql-multiple-joins-in-one-query%23new-answer', 'question_page');
}
);
...
java.lang.NoClassDefFoundError: Could not initialize class XXX
...he logs or try to log it more appropriately (like force the logging into a new file on the file system)
– John Vint
Aug 9 '16 at 12:08
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Which selector do I need to select an option by its text?
...would suffice. Or do you expect of him to retest all his answers for every new release of jQuery?
– WynandB
Nov 14 '13 at 23:51
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Shorter syntax for casting from a List to a List?
...extension method
This casts each item in the list - not the list itself. A new List<Y> will be created by the call to ToList().
This method does not support custom conversion operators. ( see http://stackoverflow.com/questions/14523530/why-does-the-linq-cast-helper-not-work-with-the-implicit-...
Is there a destructor for Java?
...t the try-with-resources statement. For example:
try (BufferedReader br = new BufferedReader(new FileReader(path))) {
System.out.println(br.readLine());
} catch (Exception e) {
...
} finally {
...
}
Here the resource that is no longer needed is freed in the BufferedReader.close() method. Yo...
Remove items from one list in another
...)).ToList();
Note that Except does not modify either list - it creates a new list with the result.
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Routing with Multiple Parameters using ASP.NET MVC
...ction}/{id}", // URL with parameters
new { controller = "Home", action = "Index", id = "" } // Parameter defaults
);
If you wanted to support a url like
/Artist/GetImages/cher/api-key
you could add a route like:
routes.MapRoute(
"Arti...
defaultdict of defaultdict?
...access a key that doesn't exist. The return value of it will be set as the new value of this key, which means in our case the value of d[Key_doesnt_exist] will be defaultdict(int).
If you try to access a key from this last defaultdict i.e. d[Key_doesnt_exist][Key_doesnt_exist] it will return 0, whi...