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How efficient is locking an unlocked mutex? What is the cost of a mutex?
... itself manages the scheduling and context switches, this makes sense. But now I have a rough imagination about what the mutex lock/unlock will do internally.
– Albert
Sep 6 '10 at 21:55
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How do I make the first letter of a string uppercase in JavaScript?
...g.prototype (this answer used to as well), but I would advise against this now due to maintainability (hard to find out where the function is being added to the prototype and could cause conflicts if other code uses the same name / a browser adds a native function with that same name in future).
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python plot normal distribution
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To avoid deprecation warnings, now you should use scipy.stats.norm.pdf(x, mu, sigma) instead of mlab.normpdf(x, mu, sigma)
– Leonardo Gonzalez
Mar 10 '19 at 22:44
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Android: What is better - multiple activities or switching views manually?
...e its own Activity.
UPDATE March 2014:
At this point the question should now include the choice of Fragments. I think that Views are probably the least likely choice of the 3: Activity, Fragment, View. If you want to implement screens that make use of the back button then it should be either Activ...
When to use a Content Provider
... with other apps.
So even if you don't need any of these functionalities now, you might need them in future and its good to go the extra mile and implement them right now.
share
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improve this ans...
Two-way encryption: I need to store passwords that can be retrieved
...ime to show you different instances will still properly decrypt the data.
Now, how does it work/why use it over another solution:
Keys
The keys are not directly used. Instead, the key is stretched by a standard PBKDF2 derivation.
The key used for encryption is unique for every encrypted block ...
Java, List only subdirectories from a directory, not files
...ry() && path.toString().contains("test")
or by date:
final long now = System.currentTimeMillis();
final long yesterday = new Date(now - 24 * 60 * 60 * 1000L).getTime();
// modified in the last 24 hours
(path, attributes) -> attributes.isDirectory() && attributes.lastModifiedTi...
How do you get centered content using Twitter Bootstrap?
...tering methods.
Demo Bootstrap 4 Horizontal Centering
Vertical Center
Now that Bootstrap 4 is flexbox by default there are many different approaches to vertical alignment using: auto-margins, flexbox utils, or the display utils along with vertical align utils. At first "vertical align utils" se...
Pandas convert dataframe to array of tuples
I have manipulated some data using pandas and now I want to carry out a batch save back to the database. This requires me to convert the dataframe into an array of tuples, with each tuple corresponding to a "row" of the dataframe.
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How to create enum like type in TypeScript?
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This should now be the accepted answer since it is still working in the RC and is therefore unlikely to break with future versions of TS.
– Adrian Grigore
Mar 6 '14 at 17:18
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