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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...w as much mutex variables into your code as you wish. You are only limited by the amount of memory you application can allocate.
Summary. User-space locks (and the mutexes in particular) are cheap and not subjected to any system limit. But too many of them spells nightmare for debugging. Simple tab...
.NET - How can you split a “caps” delimited string into an array?
... Great addition! I suspect not a few people will be surprised by the accepted answer's handling of numbers in strings. :)
– Jordan Gray
Nov 12 '12 at 14:37
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Why were pandas merges in python faster than data.table merges in R in 2012?
...e into allowing character columns in keys, which should resolve that issue by integrating more closely with R's own global string hash table. Some benchmark results are already reported by test.data.table() but that code isn't hooked up yet to replace the levels to levels match.
Are pandas merges f...
Using emit vs calling a signal as if it's a regular function in Qt
...the generated code for the signal emitting function, which you can look at by inspecting the C++ code generated by moc.
For example a foo signal with no parameters generates this member function:
void W::foo()
{
QMetaObject::activate(this, &staticMetaObject, 0, 0);
}
And the code emit fo...
Preventing form resubmission
... the location header field. The user agent (e.g. a web browser) is invited by a response with this code to make a second, otherwise identical, request to the new URL specified in the location field.
The redirect status code is to ensure that in this situation, the web user's browser can safely ref...
When should I use RequestFactory vs GWT-RPC?
...fference between GWT RPC and RequestFactory is that the RPC system is "RPC-by-concrete-type" while RequestFactory is "RPC-by-interface".
RPC is more convenient to get started with, because you write fewer lines of code and use the same class on both the client and the server. You might create a Pe...
Git is ignoring files that aren't in gitignore
... Perfectly solved my problem. Some patterns are not easy to catch by eye!!
– Willa
Sep 15 '16 at 13:27
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Passing Parameters JavaFX FXML
...y From the Caller to the Controller
Pass custom data to an FXML controller by retrieving the controller from the FXML loader instance and calling a method on the controller to initialize it with the required data values.
Something like the following code:
public Stage showCustomerDialog(Customer cus...
onclick() and onblur() ordering issue
...ue as you, my UI is designed exactly as you describe. I solved the problem by simply replacing the onClick for the menu items with an onMouseDown. I did nothing else; no onMouseUp, no flags. This resolved the problem by letting the browser automatically re-order based on the priority of these event ...
Difference between local and global indexes in DynamoDB
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These are the possible searches by index:
By Hash
By Hash + Range
By Hash + Local Index
By Global index
By Global index + Range Index
Hash and Range indexes of a table:
These are the usual indexes of previous versions of the Amazon AWS SDK.
Global and ...