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What is the difference between lock and Mutex?
...re are several other "minor" differences, like how abandonment is handled, etc.
The same can be said about ReaderWriterLock and ReaderWriterLockSlim in 3.5, Semaphore and the new SemaphoreSlim in .NET 4.0 etc.
It is true that the latter xxSlim classes cannot be used as a system-wide sync primitives...
Why doesn't Python have a sign function?
...didn't agree on what it should return in all the edge cases (+/-0, +/-nan, etc)
So they decided to implement only copysign, which (although more verbose) can be used to delegate to the end user the desired behavior for edge cases - which sometimes might require the call to cmp(x,0).
I don't know...
Changing the image source using jQuery
...ot waiting for image load to do afterward actions like maturing image size etc.
You will need to use jQuery .load() method to do stuff after image load.
$('yourimageselector').attr('src', 'newsrc').load(function(){
this.width; // Note: $(this).width() will not work for in memory images
});
...
GIF Animated 扩展：可点击透明背景动画GIF播放器 · App Inventor 2 中文网
...权信息
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目前AppInventor2用于显示图片的组件是“图像”组件，不过如果设置图片为gif的话，设计视图中图片预览会展示动图，但是通过AI伴侣测试或编译成apk真机测试，就会发现图片不会动，只会展示静态图...
What is the difference between String.Empty and “” (empty string)?
...t. The JIT will unfold for() loops, remove redundant code, inline methods, etc better and at more appropriate times than either I or the C# compiler could ever anticipate before hand. Let the JIT do its job :)
share
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How Drupal works? [closed]
...s theming/skinning system. There, it's wrapped in sidebars/headers/widgets/etc..
The rendered page is then handed back to apache and it gets sent back to the user's browser.
During that entire process, Drupal and third-party plugin modules are firing off events, and listening for them to respond. ...
Vim: apply settings on files in directory
...t-specific variables before expanding templates (which is quite useful to fetch the current project root directory and trim it from the pathnames expanded)
– Luc Hermitte
Dec 1 '10 at 16:08
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Trouble comparing time with RSpec
...need a gem; B) it works for any type of value (integer, float, date, time, etc.); C) it's natively part of RSpec
– notaceo
Feb 17 '15 at 19:25
3
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Pass in an array of Deferreds to $.when()
...his' deferred.resolveWith(this, [Array.prototype.slice.call(arguments)]) etc
– Jamie Pate
Aug 21 '13 at 20:49
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Create subdomains on the fly with .htaccess (PHP)
...ne you can tell Apache to look at the right place, with directory hashing, etc.
For example, the line:
VirtualDocumentRoot /http/users/%3.1/%3.2/%3
would tell Apache to set the document root to /http/users/s/u/subdomain when requested for subdomain.yourdomain.c