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What is a deadlock?
...ocess X and process Y
X starts to use A.
X and Y try to start using B
Y 'wins' and gets B first
now Y needs to use A
A is locked by X, which is waiting for Y
The best way to avoid deadlocks is to avoid having processes cross over in this way. Reduce the need to lock anything as much as you can.
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test a file upload using rspec - rails
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See bit.ly/OSrL7R (stack overflow question 3966263) if you are getting file does not exist errors. A different form is needed in Rails 3.2: @file = Rack::Test::UploadedFile.new(Rails.root.join('spec/fixtures/files/test.csv'), 'te...
How do I remove/delete a folder that is not empty?
...a directory tree on Windows where
some of the files have their read-only bit set. It uses the onerror
callback to clear the readonly bit and reattempt the remove. Any
subsequent failure will propagate.
import os, stat
import shutil
def remove_readonly(func, path, _):
"Clear the readonly ...
Getting the class name from a static method in Java
...will supersede this unofficial Reflection.getCallerClass() thing. It’s a bit complicated for his trivial operation, i.e. Optional<Class<?>> myself = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE) .walk(s -> s.map(StackWalker.StackFrame::getDeclaringClass) .findFi...
Dynamically adding a form to a Django formset with Ajax
...m
They both make use of jQuery and are django-specific. The first seems a bit more polished and offers a download that comes w/demos which are excellent.
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How to check if all elements of a list matches a condition?
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this way is a bit more flexible than using all():
my_list = [[1, 2, 0], [1, 2, 0], [1, 2, 0]]
all_zeros = False if False in [x[2] == 0 for x in my_list] else True
any_zeros = True if True in [x[2] == 0 for x in my_list] else False
or mo...
How to set the style -webkit-transform dynamically using JavaScript?
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win.style.transform ="translate(-50%)" not working
– Momin
Dec 20 '17 at 4:02
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Saving image from PHP URL
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Bit of an old thread... but don't forget file permissions for the directory you are saving into. Just wasted ten minutes forgetting the obvious.
– Squiggs.
Nov 23 '10 at 9:28
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AngularJS ui-router login authentication
...e successfully
return $q.when()
} else {
// The next bit of code is asynchronously tricky.
$timeout(function() {
// This code runs after the authentication promise has been rejected.
// Go to the log-in page
$state.go('logInPage')
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Check number of arguments passed to a Bash script
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