This has baffled me for a long time.开发者_如何学Go Given basic atomic primitives like compare & swap, I can see how to implement a spin lock (from which I can build mutexes).
Imagine I have wiki Articles, with many Revisions.I\'d like to do a query with ActiveRecord through the database, which only returns those Articles which have Revisions which are updated in the past 2
I would like return some records from my base (eg. users roles) And I use usually function find(), findAll(), etc., and I always must write \'conditions\' with like this: not display role admin (name!
I\'m trying to build an array of prime numbers in Java. if(c % 2 != 0 || c % 3 != 0 || c % 5 != 0) { n.add(c);
I am trying to get my head around how to design the following system, which I think can be defined as a finite state machine:
I have a Rails application that has an action invok开发者_Python百科ed frequently enough to be inconvenient when I am developing, as it results in a lot of extra log output I don\'t care about.How can
Ok I am serving two domains off of one box.The domains are: www.old.org and www.new.com.As it is now, all of the files and dirs are the same on both domains.
I have this line: for (var j = 0; j<1; j = (j + 0.1).toPrecision(1)) I\'m try开发者_运维知识库ing to set up this statement so I get 0, 0.1, 0.2, 0.3 up to the number 1.
I need to delete a row based upon the value in a column while executing an update query. Here is the code:
I\'m trying to write a simple example command that prints nothing without an argument, but with an argument it surrounds it with something.
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