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What's the difference between deadlock and livelock?
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Taken from http://en.wikipedia.org/wiki/Deadlock:
In concurrent computing, a deadlock is a state in which each member of a group of actions, is waiting for some other member to release a lock
A livelock is similar to a deadlock,
except...
Database: To delete or not to delete records
...onitoring purposes (or whatever you had in mind).
For temporal data, see: http://talentedmonkeys.wordpress.com/2010/05/15/temporal-data-in-a-relational-database/
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Amazon S3 boto - how to create a folder?
...MyFolder"+ extension, new ByteArrayInputStream(new byte[0]), null);
see:
http://www.snowgiraffe.com/tech/147/creating-folders-programmatically-with-amazon-s3s-api-putting-babies-in-buckets/
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How to determine if a record is just created or updated in after_save
...mething to happen once after a new record has been saved.
More info here: http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html
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Ajax request returns 200 OK, but an error event is fired instead of success
...ent-Type": "application/json",
"Access-Control-Allow-Origin": "http://localhost:8080"
});
It literally cost me an hour of banging my head against the wall. I am feeling stupid...
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Git submodule update
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C# 5 async CTP: why is internal “state” set to 0 in generated code before EndAwait call?
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A dependent property in a ReferentialConstraint is mapped to a store-generated column
... .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity)
Example http://www.entityframeworktutorial.net/code-first/configure-one-to-one-relationship-in-code-first.aspx
This is enough to define the relationship
// Configure Student & StudentAddress entity
modelBuilder.Entity<Studen...
How to compile for Windows on Linux with gcc/g++?
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From: https://fedoraproject.org/wiki/MinGW/Tutorial
As of Fedora 17 it is possible to easily build (cross-compile) binaries for the win32 and win64 targets. This is realized using the mingw-w64 toolchain: http://mingw-w64.sf.ne...
Compiling Java 7 code via Maven
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I had the same problem and to solve this I follow this blog article: http://www.mkyong.com/java/how-to-set-java_home-environment-variable-on-mac-os-x/
$ vim .bash_profile
export JAVA_HOME=$(/usr/libexec/java_home)
$ source .bash_profile
$ echo $JAVA_HOME
/Library/Java/JavaVirtualMachines/...