Why doesn't Ruby have a ThreadPool built-in?

Question

I have a program that creates 10000 threads at once, and runs 8 at the same time.

But ruby doesn't have a ThreadPool built-in as Java. Is there a good reason?

Answer 1

probably because it's easy to roll your own using the standard library "Queue" class.

q = Queue.new
3.times { Thread.new {  while something = q.pop(true) rescue nil; ... }

It's a good question though--I might suggest bringing it up with Ruby Core.

Answer 2

My suspicion would be it's because a ThreadPool wouldn't be that useful in C-based implementations of Ruby. You can use only one processor at a time with Matz's Ruby Intepreter or Yet Another Ruby VM.

If you want multiple threads to be run on multiple processors, you need to use JRuby instead.