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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...s or a single one for an object.
If you have many threads and the access to the object happens often, then multiple locks would increase parallelism. At the cost of maintainability, since more locking means more debugging of the locking.
How efficient is it to lock a mutex? I.e. how much assem...
Simplest way to serve static data from outside the application server in a Java web application
I have a Java web application running on Tomcat. I want to load static images that will be shown both on the Web UI and in PDF files generated by the application. Also new images will be added and saved by uploading via the Web UI.
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How to redirect output to a file and stdout
...ple, if you only care about stdout:
ls -a | tee output.file
If you want to include stderr, do:
program [arguments...] 2>&1 | tee outfile
2>&1 redirects channel 2 (stderr/standard error) into channel 1 (stdout/standard output), such that both is written as stdout. It is also direc...
How to solve the error LNK2019: unresolved external symbol - function?
I get this error, but I don't know how to fix it.
11 Answers
11
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How to use redis PUBLISH/SUBSCRIBE with nodejs to notify clients when data values change?
...lish/subscribe application with NodeJS and Redis. I need an example of how to notify web clients when the data values in Redis change.
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Proxy with express.js
To avoid same-domain AJAX issues, I want my node.js web server to forward all requests from URL /api/BLABLA to another server, for example other_domain.com:3000/BLABLA , and return to user the same thing that this remote server returned, transparently.
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The entity cannot be constructed in a LINQ to Entities query
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You cannot (and should not be able to) project onto a mapped entity. You can, however, project onto an anonymous type or onto a DTO:
public class ProductDTO
{
public string Name { get; set; }
// Other field you may need from the Product entity
}
And...
Draw text in OpenGL ES
...l OpenGL game for the Android platform and I wonder if there's an easy way to render text on top of the rendered frame (like a HUD with the player´s score etc). The text would need to use a custom font also.
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Do zombies exist … in .NET?
...He argued that .NET locking should be avoided on critical systems expected to be under heavy-load if at all possible in order to avoid the admittedly small possibility of a "zombie thread" crashing a system. I routinely use locking and I didn't know what a "zombie thread" was, so I asked. The impr...
When/Why to use Cascading in SQL Server?
...OrderLines will never be shared between multiple orders. If the Order were to vanish, the OrderLine should as well, and a line without an Order would be a problem.
The canonical example for Cascade Delete is SomeObject and SomeObjectItems, where it doesn't make any sense for an items record to ever ...