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Difference between dispatch_async and dispatch_sync on serial queue?
...(1000);printf("1"); });
dispatch_async(_serialQueue, ^{ printf("2"); });
What may happened is
Thread 1: dispatch_async a time consuming task (task 1) to serial queue
Thread 2: start executing task 1
Thread 1: dispatch_async another task (task 2) to serial queue
Thread 2: task 1 finished. start ...
Rspec doesn't see my model Class. uninitialized constant error
...pec/rails_helper.rb file. If you run rails generate rspec:install, this is what it produces (rspec-rails 3.0.1, rails 4.1.1). Turns out the rails_helper.rb file contains some similar code to yours and should be required when you want to load Rails in your specs.
– Dennis
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Best way to convert text files between character sets?
What is the fastest, easiest tool or method to convert text files between character sets?
20 Answers
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Using sed to mass rename files
...00001-0708-*|sed 's/F0000\(.*\)/mv & F000\1/' | sh
Being able to see what's actually changing in the
s/search/replacement/ makes it much more readable. Also it won't keep
sucking characters out of your filename if you accidentally run it
twice or something.
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How can I escape a double quote inside double quotes?
...<"$b" #\0 is a special sed operator
Just another "0" here #this is not what i wanted to be
$ sed 's/text/\x22\x27\0\x27\x22/' <<<"$b"
Just another "'text'" here #now we are talking. You would normally need a dozen of backslashes to achieve the same result in the normal way.
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How can I find non-ASCII characters in MySQL?
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It depends exactly what you're defining as "ASCII", but I would suggest trying a variant of a query like this:
SELECT * FROM tableName WHERE columnToCheck NOT REGEXP '[A-Za-z0-9]';
That query will return all rows where columnToCheck contains...
Eclipse - Unable to install breakpoint due to missing line number attributes
...destdir="./bin" debug="true">
Still, same message.
I didn't find out what caused this message and why it wouldn't go away. Though it seemed to have something to do with the running Tomcat debug session: when disconnected, recompiling solves the issue. But on connecting the debugger to Tomcat o...
How to execute a bash command stored as a string with quotes and asterisk [duplicate]
...e approach with security vulnerabilities more useful than the one without? What benefit does it add? You can still dynamically construct your arrays; you just get the benefit of not risking their contents being parsed in a manner different from that intended.
– Charles Duffy
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Does anyone still use [goto] in C# and if so why? [closed]
...as wondering whether anyone still uses the "goto" keyword syntax in C# and what possible reasons there are for doing so.
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How can I convert string date to NSDate?
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What if I want to pass the current date as string. Will this work?
– Arjun Kalidas
Nov 3 '16 at 11:39
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