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Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)
... to be recursive. That means the same thread can lock the same mutex twice and won't deadlock. Of course it also needs to unlock it twice, otherwise no other thread can obtain the mutex. Not all systems supporting pthreads also support recursive mutexes, but if they want to be POSIX conform, they h...
C#: why sign an assembly?
...mblies to be signed with the same key.
Is signing assemblies necessary and what would be wrong with not signing it?
No, it is not necessary but it is a mechanism allowing you to ensure the authenticity of an assembly. It allows you to ensure that an assembly hasn't been tampered with and indee...
How do the Proxy, Decorator, Adapter, and Bridge Patterns differ?
I was looking at the Proxy Pattern, and to me it seems an awful lot like the Decorator, Adapter, and Bridge patterns. Am I misunderstanding something? What's the difference? Why would I use the Proxy pattern versus the others? How have you used them in the past in real world projects?
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Center image horizontally within a div
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I don't think this is a good idea, and also I believe there's some caveats like margin: auto is dependent on the containing element having a designated width value.
– Jared Farrish
Jun 12 '12 at 0:50
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Android and setting alpha for (image) view alpha
...n. The alternative is to use View.setAlpha(float) whose XML counterpart is android:alpha. It takes a range of 0.0 to 1.0 instead of 0 to 255. Use it e.g. like
<ImageView android:alpha="0.4">
However, the latter in available only since API level 11.
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Add a default value to a column through a migration
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I tried it on PostgreSQL and it updated previously created fields.
– Aboozar Rajabi
May 12 '16 at 6:31
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Can't push to GitHub because of large file which I already deleted
...at file. The problem is that the file is present in the history.
This command changes the hashes of your commits which can be a real problem, especially on shared repositories. It should not be performed without understanding the consequences.
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What is the difference between sites-enabled and sites-available directory?
What is use of these two directories in apache2 and how can we do it?
3 Answers
3
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Best way to require all files from a directory in ruby?
...ich can lead to spurious errors. I added my own answer which explains that and shows how to strip the extension.
– Pete Hodgson
Feb 9 '10 at 18:40
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What is copy-on-write?
I would like to know what copy-on-write is and what it is used for? The term 'copy-on-write array' is mentioned several times in the Sun JDK tutorials but I didn't understand what it meant.
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