Computer Science Canada

Fun with multi-threading
Author:  wtd [ Sat Mar 27, 2004 10:53 am ]
Post subject:  Fun with multi-threading
I've been playing with threads in Ruby (though you can do multi-threading in lots of languages, it's really easy in Ruby), and just found something kind of interesting.

code:
>> ["hello", "world", "super calla fragalistic"].each do |x|
*>        Thread.new do
*>                puts x
>>       end
>> end
helloworld
super calla fragalistic
=> ["hello", "world", "super calla fragalistic"]
>> ["hello", "world", "super calla fragalistic"].each do |x|
*>       puts x
>> end
hello
world
super calla fragalistic
=> [1, 2, 3]
>> exit
C:\>


It turns out that the puts method is so fast, that running it in two separate threads the second wrote to standard output before the first even had a chance to add a newline. puts adds a newline if the thing being printed doesn't already end in one.

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