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What are the differences between various threading synchronization options in C#?
... member object of your class.
Monitors
lock(obj) is implemented internally using a Monitor. You should prefer lock(obj) because it prevents you from goofing up like forgetting the cleanup procedure. It 'idiot-proof's the Monitor construct if you will.
Using Monitor is generally preferred over m...
How do I create a dictionary with keys from a list and values defaulting to (say) zero? [duplicate]
...that if 0 is mutable (e.g. list or dict), you get into trouble, because it all refers to the same memory location. For this reason, the accepted answer is safer.
– NumesSanguis
Oct 25 '19 at 7:00
...
Make child visible outside an overflow:hidden parent
In CSS the overflow:hidden is set on parent containers in order to allow it to expand with the height of their floating children.
...
Height of status bar in Android [duplicate]
...I'm also asking if I can assume that the status bar has the same height in all devices.
– hpique
Aug 4 '10 at 22:19
17
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What database does Google use?
...le has successfully
provided a flexible, high-performance
solution for all of these Google
products.
Some features
fast and extremely large-scale DBMS
a sparse, distributed multi-dimensional sorted map, sharing characteristics of both row-oriented and column-oriented databases.
designed to...
Dynamically Changing log4j log level
What are the different approaches for changing the log4j log level dynamically, so that I will not have to redeploy the application. Will the changes be permanent in those cases?
...
Method has the same erasure as another method in type
...ode that still uses raw types.
Here's an illustration of why this was not allowed, drawn from the JLS. Suppose, before generics were introduced to Java, I wrote some code like this:
class CollectionConverter {
List toList(Collection c) {...}
}
You extend my class, like this:
class Overrider e...
Why were pandas merges in python faster than data.table merges in R in 2012?
...els) is large: 10,000.
Does Rprof() reveal most of the time spent in the call sortedmatch(levels(i[[lc]]), levels(x[[rc]])? This isn't really the join itself (the algorithm), but a preliminary step.
Recent efforts have gone into allowing character columns in keys, which should resolve that issue ...
How to read XML using XPath in Java
...PathExpression expr = xpath.compile(<xpath_expression>);
Then you call expr.evaluate() passing in the document defined in that code and the return type you are expecting, and cast the result to the object type of the result.
If you need help with a specific XPath expressions, you should pro...
Android update activity UI from service
I have a service which is checking for new task all the time. If there is new task, I want to refresh the activity UI to show that info.
I did find https://github.com/commonsguy/cw-andtutorials/tree/master/18-LocalService/ this example. Is that a good approch ? Any other examples?
...