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

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+A synchronization primitive, which limits access to a given resource, such as a limited number of database connections, open files, or network connections.
+
+## Example
+
+~~~ ruby
+require 'async'
+require 'async/semaphore'
+require 'net/http'
+
+Sync do
+	# Only allow two concurrent tasks at a time:
+	semaphore = Async::Semaphore.new(2)
+	
+	# Generate an array of 10 numbers:
+	terms = ['ruby', 'python', 'go', 'java', 'c++'] 
+	
+	# Search for the terms:
+	terms.each do |term|
+		semaphore.async do |task|
+			Console.info("Searching for #{term}...")
+			response = Net::HTTP.get(URI "https://www.google.com/search?q=#{term}")
+			Console.info("Got response #{response.size} bytes.")
+		end
+	end
+end
+~~~
+
+### Output
+
+~~~
+0.0s     info: Searching for ruby... [ec=0x3c] [pid=50523]
+0.04s     info: Searching for python... [ec=0x21c] [pid=50523]
+1.7s     info: Got response 182435 bytes. [ec=0x3c] [pid=50523]
+1.71s     info: Searching for go... [ec=0x834] [pid=50523]
+3.0s     info: Got response 204854 bytes. [ec=0x21c] [pid=50523]
+3.0s     info: Searching for java... [ec=0xf64] [pid=50523]
+4.32s     info: Got response 103235 bytes. [ec=0x834] [pid=50523]
+4.32s     info: Searching for c++... [ec=0x12d4] [pid=50523]
+4.65s     info: Got response 109697 bytes. [ec=0xf64] [pid=50523]
+6.64s     info: Got response 87249 bytes. [ec=0x12d4] [pid=50523]
+~~~