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BIO与NIO、AIO的区别(这个容易理解) - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...IO是否完成，那么为什么说是阻塞的呢？因为此时是通过select系统调用来完成的，而select函数本身的实现方式是阻塞的，而采用select函数有个好处就是它可以同时监听多个文件句柄，从而提高系统的并发性！
异步非阻塞IO:在此...
How to cherry-pick multiple commits
....
Press F5 in gitk. Nothing changes. But no HEAD is marked.
Run git branch selection
Press F5 in gitk. The new branch with its commits appears.
This should clarify things:
Commit a is the new root destination of the group.
Commit b is the commit before the first commit of the group (exclusive).
...
Node.js Best Practice Exception Handling
...any different sources on this topic including code example and quotes from selected blog posts. The complete list of best practices can be found here
Best practices of Node.JS error handling
Number1: Use promises for async error handling
TL;DR: Handling async errors in callback style is proba...
Namespace not recognized (even though it is there)
...u can check/change this by right-clicking your project (not the solution), select Properties -> Application -> Target framework. The target framework is a dropdown on that page.
This is a problem in Visual Studio (I would even go so far as to call it a bug). AutoMapper requires assemblies ...
ASP.NET MVC Yes/No Radio Buttons with Strongly Bound Model MVC
...
The second parameter is selected, so use the ! to select the no value when the boolean is false.
<%= Html.RadioButton("blah", !Model.blah) %> Yes
<%= Html.RadioButton("blah", Model.blah) %> No
...
SQL : BETWEEN vs =
...tion.
Use an alternative longer syntax where BETWEEN doesn't work e.g.
Select EventId,EventName from EventMaster
where EventDate >= '10/15/2009' and EventDate < '10/18/2009'
(Note < rather than <= in second condition.)
...
How can I delete a service in Windows?
...hing for the command prompt on your start menu and then right-clicking and selecting "Run as administrator". Note to PowerShell users: sc is aliased to set-content. So sc delete service will actually create a file called delete with the content service. To do this in Powershell, use sc.exe delete se...
How do you change Background for a Button MouseOver in WPF?
...), you can use the Visual Studio XAML Designer:
While editing your XAML, select the "Design" tab.
In the "Design" tab, find the button for which you want to disable the effect.
Right-click that button, and choose "Edit Template/Edit a Copy...". Select in the prompt you get where you want the new t...
Zooming MKMapView to fit annotation pins?
...
I've also found this useful for selecting annotations outside the current visible map area. By default, MapView doesn't select non-visible annotations. Call showAnnotations with an array of your non-visible annotation(s), prior to calling selectAnnotation, ...
How to generate a number of most distinctive colors in R?
...the colorBrewer package (and website). If you want diverging colours, then select diverging on the site. For example,
library(colorBrewer)
brewer.pal(7, "BrBG")
The I want hue web site gives lots of nice palettes. Again, just select the palette that you need. For example, you can get the rgb col...