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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...ough to atomically change data. Multi-processor systems can use a test-and-set strategy.
In both those cases, the instructions are relatively efficient.
As to whether you should provide a single mutex for a massive data structure, or have many mutexes, one for each section of it, that's a balancin...
Export Data from mysql Workbench 6.0
...lain about a different unsupported parameter: mysqldump: unknown variable 'set-gtid-purged=OFF'
– clst
Dec 15 '15 at 10:56
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Editing dictionary values in a foreach loop
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Setting a value in a dictionary updates its internal "version number" - which invalidates the iterator, and any iterator associated with the keys or values collection.
I do see your point, but at the same time it would be od...
Choosing between qplot() and ggplot() in ggplot2 [closed]
...centrating on a single aspect seems optimal.
However, if you get new data sets each week, then you are probably interested in quickly exploring the data sets and producing good quality plot. In this case, learn both. You will get enough practice with the syntax and will (eventually) save time with ...
The name 'InitializeComponent' does not exist in the current context
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The Build Action for the .xaml file must also be set to "Page", when moving a xaml file between projects this setting gets lost (in VS 2010 at least).
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std::wstring VS std::string
...had to support a lot of application working with char and on different charsets/codepages produced in all the world, before the advent of Unicode.
So their solution was an interesting one: If an application works with char, then the char strings are encoded/printed/shown on GUI labels using the loc...
Bogus foreign key constraint fail
... making it neccessary to write all the drop statements in one query, eg.
SET FOREIGN_KEY_CHECKS=0;
DROP TABLE my_first_table_to_drop;
DROP TABLE my_second_table_to_drop;
SET FOREIGN_KEY_CHECKS=1;
Where the SET FOREIGN_KEY_CHECKS=1 serves as an extra security measure...
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Expansion of variables inside single quotes in a command in Bash
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Below is what worked for me -
QUOTE="'"
hive -e "alter table TBL_NAME set location $QUOTE$TBL_HDFS_DIR_PATH$QUOTE"
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How can I concatenate regex literals in JavaScript?
...= /([^\\]|^)(?=\((?!\?:))/g; // Home-made regexp to count groups.
var offset = count(numberGroups, r1.source);
var escapedMatch = /[\\](?:(\d+)|.)/g; // Home-made regexp for escaped literals, greedy on numbers.
var r2newSource = r2.source.replace(escapedMatch, function(match, number...
Generic deep diff between two objects
...ue from first object and if it doesn't exist value from second one will be set as data.
– sbgoran
Dec 21 '11 at 22:18
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