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Technically what is the main difference between Oracle JDK and OpenJDK? [duplicate]
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Wow, such confuse. So after Java 7, when you package an app with OpenJDK-JRE, it's identical to packaging it with Oracle ServerJDK-JRE?
– Pacerier
Jul 28 '17 at 16:10
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What is the difference between mutex and critical section?
...ronization primitive (like an event or semaphore).
I wrote a quick sample app that compares the time between the two of them. On my system for 1,000,000 uncontended acquires and releases, a mutex takes over one second. A critical section takes ~50 ms for 1,000,000 acquires.
Here's the test code,...
async/await - when to return a Task vs void?
...ask resulted in an exception, and nobody handled the exception. When that happens, the TaskScheduler.UnobservedTaskException handler runs. You should never let this happen. To use your example,
public static async void AsyncMethod2(int num)
{
await Task.Factory.StartNew(() => Thread.Sleep(nu...
Show pending migrations in rails
Is there a rake task that shows the pending migrations in a rails app?
10 Answers
10
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Android - Emulator in landscape mode, screen does not rotate
...tes the screen to landscape orientation but the Android OS and none of the apps rotate. So everything is sitting sideways. Is there something in the AVD configuration that needs to be set in order for the device to rotate properly?
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Get URL of ASP.Net Page in code-behind [duplicate]
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This doesn't work if the application is not hosted on the server root but in a directory. If the application is hosted on www.contoso.com/app/ this will return just www.contoso.com
– linkerro
Oct 3 '12 at 8:58
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How to make a transparent UIWebView
I have an app with a UITableView and a corresponding detail view for each row. In the detail view I have to display some text and a background image (text is different for each row, but the image remains the same). The easiest way, in my opinion, is to put the text in an .rtf file and display it i...
How can I output a UTF-8 CSV in PHP that Excel will read properly?
...ark to the start of the file
chr(255) . chr(254)
The next problem that appears only with Excel on OS X (but not Windows) will be when viewing a CSV file with comma separated values, Excel will render rows only with one row and all of the text along with the commas in the first row.
The way to a...
How to delete all records from table in sqlite with Android?
My app has two buttons, the first button is for deleting record on user input and the second button is for deleting all records. But when I want to delete data it shows the message
"Your application has been forcefully stopped".
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C++ Build Systems - What to use? [closed]
...lly - and I'm investigating the build systems that are available. It would appear that the answer is "Many, and they're all awful".
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