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Lock, mutex, semaphore… what's the difference?
... thread.
Thread thread = new Thread(new ParameterizedThreadStart(Guest));
thread.Start(i);
}
}
public static void Guest(object args)
{
// Wait to enter the nightclub (a semaphore to be released).
Console.Wri...
Java 8 Streams: multiple filters vs. complex condition
... always complex filter giving better results, irrespective of which thread starts first. Below are the results. Test #1: {count=100, sum=7207, min=65, average=72.070000, max=91} Test #3: {count=100, sum=7959, min=72, average=79.590000, max=97} Test #2: {count=100, sum=8869, min=79, average=88.690000...
ByteBuffer.allocate() vs. ByteBuffer.allocateDirect()
...st attempted that, but we can see many many problems with it's benchmark, starting with "the results fluctuate widely depending on the OS". Also, what if there's a black sheep that do horrible stuff like buffer copying on every I/O? Then because of that sheep, we may be forced to prevent writing c...
Why is C so fast, and why aren't other languages as fast or faster? [closed]
...ess thousands of lines of data in less time then Java or .NET programs can start up. It is one of the frustrations that I have with the more modern languages. C is great for lean programs that need minimal runtime requirements. PowerBasic is great for that also.
– bruceatk
...
STL or Qt containers?
...
I started by using std::(w)string and the STL containers exclusively and converting to/from the Qt equivalents, but I have already switched to QString and I find that I'm using Qt's containers more and more.
When it comes to s...
Saving an Object (Data persistence)
...est bet is to use dill, which can serialize almost anything in python.
We start with a class…
Python 2.7.8 (default, Jul 13 2014, 02:29:54)
[GCC 4.2.1 Compatible Apple Clang 4.1 ((tags/Apple/clang-421.11.66))] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>...
What's the rationale for null terminated strings?
...for the main use of strings : constant text read
sequentially from a known start
(mostly messages to the user).
the terminating zero is not even mandatory, all necessary tools
to manipulate chars like a bunch of
bytes are available. When performing
array initialisation in C, you can
even avoid the N...
Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
... functions. If you need to modify a local copy, then call x=copy(x) at the start of the function. But, remember data.table is for large data (as well as faster programming advantages for small data). We deliberately don't want to copy large objects (ever). As a result we don't need to allow for the ...
Volatile vs. Interlocked vs. lock
...ould use interlocked for a genuine single counter. I just wouldn't want to start messing around trying to work out interactions between multiple lock-free updates to variables.
– Jon Skeet
Mar 22 '12 at 20:30
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Custom HTTP headers : naming conventions
...
The recommendation is was to start their name with "X-". E.g. X-Forwarded-For, X-Requested-With. This is also mentioned in a.o. section 5 of RFC 2047.
Update 1: On June 2011, the first IETF draft was posted to deprecate the recommendation of using the...