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How efficient is locking an unlocked mutex? What is the cost of a mutex?
In a low level language (C, C++ or whatever): I have the choice in between either having a bunch of mutexes (like what pthread gives me or whatever the native system library provides) or a single one for an object.
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How can I use redis with Django?
I've heard of redis-cache but how exactly does it work? Is it used as a layer between django and my rdbms, by caching the rdbms queries somehow?
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URL encoding the space character: + or %20?
... (emphasis and link added):
When data that has been entered into HTML forms is submitted, the form field names and values are encoded and sent to the server in an HTTP request message using method GET or POST, or, historically, via email. The encoding used by default is based on a very early ver...
How to analyze a java thread dump?
I am trying to understand more about java, especially about memory management and threads.
For this reason I have recently found interest in looking at thread dumps.
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What is the difference between Amazon SNS and Amazon SQS?
...euing system. Messages are NOT pushed to receivers. Receivers have to poll or pull messages from SQS. Messages can't be received by multiple receivers at the same time. Any one receiver can receive a message, process and delete it. Other receivers do not receive the same message later. Polling inher...
How do I negate a test with regular expressions in a bash script?
...-suse-linux-gnu), I would like to negate a test with Regular Expressions. For example, I would like to conditionally add a path to the PATH variable, if the path is not already there, as in:
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SignalR: Why choose Hub vs. Persistent Connection?
...tent connections.
From the highly up-voted comment below:
Partially correct. You can get topics or groups in persistent connections as well. The big difference is dispatching different types of messages. For example you have different kinds of messages and you want to send different kinds of p...
How do I delete an item or object from an array using ng-click?
...son this is undefined. Plunker/jsfiddle perhaps?
– Tjorriemorrie
Sep 19 '13 at 10:59
11
.indexOf(...
How to declare std::unique_ptr and what is the use of it?
I try to understand how std::unique_ptr works and for that I found this document. The author starts from the following example:
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Should try…catch go inside or outside a loop?
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PERFORMANCE:
There is absolutely no performance difference in where the try/catch structures are placed. Internally, they are implemented as a code-range table in a structure that is created when the method is called. While the ...