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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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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...
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...
Why doesn't Java allow generic subclasses of Throwable?
...tinguish the exception instances, and therefore no way to tell which catch block should be executed.
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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)...
Count, size, length…too many choices in Ruby?
...ong n = 0;
if (argc == 0) {
VALUE *p, *pend;
if (!rb_block_given_p())
return LONG2NUM(RARRAY_LEN(ary));
// etc..
}
}
The code for array.count does a few extra checks but in the end calls the exact same code: LONG2NUM(RARRAY_LEN(ary)).
Hashes (source ...
Django Admin - change header 'Django administration' text
...y of the original base_site.html, except putting in your custom title:
{% block branding %}
<h1 id="site-name">{% trans 'my cool admin console' %}</h1>
{% endblock %}
For this to work, you need to have the correct settings for your project, namely in settings.py:
Make sure /projectd...
How do I download a binary file over HTTP?
...
the begin ... ensure ... end is not necessary if the open block form is used. open 'sample.flv' do |f| .... f.write segment
– lab419
Dec 17 '14 at 14:52
1
...
Does :before not work on img elements?
...n.com/g/250/250);
}
/* img:before - firefox */
body:not(:-moz-handler-blocked) img:before {
padding:125px;
background:url(http://placekitten.com/g/250/250) no-repeat;
}
/* img:after */
img:after {
/* width of img:before */
left:250px;
content:url(http://lorempixe...