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bin/gems/async-2.23.0/lib/async/barrier.md

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+A synchronization primitive, which allows one task to wait for a number of other tasks to complete. It can be used in conjunction with {Semaphore}.
+
+
+## Example
+
+~~~ ruby
+require 'async'
+require 'async/barrier'
+
+barrier = Async::Barrier.new
+Sync do
+	Console.info("Barrier Example: sleep sort.")
+	
+	# Generate an array of 10 numbers:
+	numbers = 10.times.map{rand(10)}
+	sorted = []
+	
+	# Sleep sort the numbers:
+	numbers.each do |number|
+		barrier.async do |task|
+			sleep(number)
+			sorted << number
+		end
+	end
+	
+	# Wait for all the numbers to be sorted:
+	barrier.wait
+	
+	Console.info("Sorted", sorted)
+ensure
+	# Ensure all the tasks are stopped when we exit:
+	barrier.stop
+end
+~~~
+
+### Output
+
+~~~
+0.0s     info: Barrier Example: sleep sort.
+9.0s     info: Sorted
+             | [3, 3, 3, 4, 4, 5, 5, 5, 8, 9]
+~~~