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What exactly are “spin-locks”?
...ritical sections etc), operating system puts your thread in the WAIT state and preempts it by scheduling other threads on the same core. This has a performance penalty if the wait time is really short, because your thread now has to wait for a preemption to receive CPU time again.
Besides, kernel ob...
INSERT IF NOT EXISTS ELSE UPDATE?
... the ID column: In the replacement case the statement would set it to NULL and then a fresh ID would be allocated.
This approach can also be used if you want to leave particular field values alone if the row in the replacement case but set the field to NULL in the insert case.
For example, assumin...
How to sort by two fields in Java?
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@Ralph: I have amended my answer, and added a brief description.
– Richard H
Jan 26 '11 at 14:53
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pull/push from multiple remote locations
The short: is there a way to have a git repo push to and pull from a list of remote repos (rather than a single "origin")?
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How often should you use git-gc?
... on how much the repository is used. With one user checking in once a day and a branch/merge/etc operation once a week you probably don't need to run it more than once a year.
With several dozen developers working on several dozen projects each checking in 2-3 times a day, you might want to run it...
Best way to parse RSS/Atom feeds with PHP [closed]
...r Atom feed isn't well formed. Are there any other options for parsing RSS and Atom feeds with PHP?
10 Answers
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How to convert JSON data into a Python object
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UPDATE
With Python3, you can do it in one line, using SimpleNamespace and object_hook:
import json
from types import SimpleNamespace
data = '{"name": "John Smith", "hometown": {"name": "New York", "id": 123}}'
# Parse JSON into an object with attributes corresponding to dict keys.
x = json.lo...
Difference between Build Solution, Rebuild Solution, and Clean Solution in Visual Studio?
What is the difference between Build Solution, Rebuild Solution, and Clean Solution in Visual Studio?
12 Answers
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How to play audio?
I am making a game with HTML5 and JavaScript.
19 Answers
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What does “SyntaxError: Missing parentheses in call to 'print'” mean in Python?
..."Missing parentheses in call to print" case is a compile time syntax error and hence has access to the raw source code, it's able to include the full text on the rest of the line in the suggested replacement. However, it doesn't currently try to work out the appropriate quotes to place around that e...