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What is a deadlock?
...xample:
Resource A and resource B are used by process X and process Y
X starts to use A.
X and Y try to start using B
Y 'wins' and gets B first
now Y needs to use A
A is locked by X, which is waiting for Y
The best way to avoid deadlocks is to avoid having processes cross over in this way. Redu...
Bash script to calculate time elapsed
...ound. Instead use the arithmetic expansion:
echo "It takes $(($ENDTIME - $STARTTIME)) seconds to complete this task..."
You could also save the commands in a separate script, commands.sh, and use time command:
time commands.sh
...
Programmer Puzzle: Encoding a chess board state throughout a game
...f the problem for piece layout.
The Problem
This image illustrates the starting Chess position. Chess occurs on an 8x8 board with each player starting with an identical set of 16 pieces consisting of 8 pawns, 2 rooks, 2 knights, 2 bishops, 1 queen and 1 king as illustrated here:
Positions are...
How can I perform a culture-sensitive “starts-with” operation from the middle of a string?
... this CompareInfo compareInfo,
String source, String prefix, int startIndex, CompareOptions options
) {
if(compareInfo.IndexOf(source, prefix, startIndex, options)!=startIndex)
return ~0;
else
// source is started with prefix
// t...
Google App Engine: Is it possible to do a Gql LIKE query?
...r
How do I do a like query (LIKE "foo%")
You can do something like a startWith, or endWith if you reverse the order when stored and searched. You do a range query with the starting value you want, and a value just above the one you want.
String start = "foo";
... = ofy.query(MyEntity.cla...
Best ways to teach a beginner to program? [closed]
...ntation. It's still a work in progress, but I hope it helps.
1) FizzBuzz. Start with command line programs. You can write some fun games, or tools, very quickly, and you learn all of the language features very quickly without having to learn the GUI tools first. These early apps should be simple en...
Circular list iterator in Python
I need to iterate over a circular list, possibly many times, each time starting with the last visited item.
6 Answers
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How can I improve my paw detection?
After my previous question on finding toes within each paw , I started loading up other measurements to see how it would hold up. Unfortunately, I quickly ran into a problem with one of the preceding steps: recognizing the paws.
...
Is it possible to append to innerHTML without destroying descendants' event listeners?
...es (and their event handlers), you'll need to use DOM functions:
function start() {
var myspan = document.getElementById("myspan");
myspan.onclick = function() { alert ("hi"); };
var mydiv = document.getElementById("mydiv");
mydiv.appendChild(document.createTextNode("bar"));
}
Ed...
Asynchronous vs Multithreading - Is there a difference?
...tten and how it is executed. For example, in C#, I can have a method that starts an async task, my method is fully async aware and can do other things without waiting for the task to complete. However, the CLR can also decide to inline my task and execute it synchronously.
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