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Is volatile expensive?
...now that it will be accessed from multiple threads outside of synchronized blocks. Even then you should consider whether volatile is the best choice versus synchronized, AtomicReference and its friends, the explicit Lock classes, etc.
...
Understanding dispatch_async
... order in which they are received).
So, if you send 1000 dispatch_async() blocks to DISPATCH_QUEUE_PRIORITY_DEFAULT, those tasks will start executing in the order you sent them into the queue. Likewise for the HIGH, LOW, and BACKGROUND queues. Anything you send into any of these queues is executed ...
JavaScript + Unicode regexes
...character classes and has no concept of POSIX character classes or Unicode blocks/sub-ranges.
Issues with Unicode in JavaScript regular expressions
Check your expectations here: Javascript RegExp Unicode Character Class tester (Edit: the original page is down, the Internet Archive still has a copy...
Easy way to write contents of a Java InputStream to an OutputStream
... stream. This method does not close
either stream.
This method may block indefinitely reading from the
input stream, or writing to the output stream. The behavior for the
case where the input and/or output stream is asynchronously closed, or
the thread interrupted during the transfer, ...
Is GridFS fast and reliable enough for production?
... since it's up and running. The resize and store stuff is done by a simple php script... but for sure, a python script, or something like java could be faster.
Current data size : 11.23g
Current storage size : 12.5g
Indices : 5
Index size : 849.65m
About the reliability : This is very reliable....
What is the best way to convert an array to a hash in Ruby
...na,2] ].to_h #=> {apple: 1, banana: 2}
Note that to_h also accepts a block:
[:apple, :banana].to_h { |fruit| [fruit, "I like #{fruit}s"] }
# => {apple: "I like apples", banana: "I like bananas"}
Note: to_h accepts a block in Ruby 2.6.0+; for early rubies you can use my backports gem a...
What is the global interpreter lock (GIL) in CPython?
...sion. C extension writers need to release the GIL when their extensions do blocking I/O, so that other threads in the Python process get a chance to run.
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How do I create a file and write to it in Java?
...at each of the code samples below may throw IOException. Try/catch/finally blocks have been omitted for brevity. See this tutorial for information about exception handling.
Note that each of the code samples below will overwrite the file if it already exists
Creating a text file:
PrintWriter writ...
How do I detect “shift+enter” and generate a new line in Textarea?
...S6 here's the simplest way
shift + enter New Line at any position
enter Blocked
class App extends React.Component {
constructor(){
super();
this.state = {
message: 'Enter is blocked'
}
}
onKeyPress = (e) => {
if (e.keyCode === 13 && e.shiftKey)...
Spinlock versus Semaphore
...ore efficient. Also, for realtime applications it may not be acceptable to block and wait for the scheduler to come back to them at some far away time in the future.
A semaphore, by contrast, either does not spin at all, or only spins for a very short time (as an optimization to avoid the syscall o...