Prefer IO::Event::Timers.

async.gemspec

@@ -27,6 +27,5 @@ Gem::Specification.new do |spec|
 
 	spec.add_dependency "console", ["~> 1.25", ">= 1.25.2"]
 	spec.add_dependency "fiber-annotation"
-	spec.add_dependency "io-event", ["~> 1.5", ">= 1.5.1"]
-	spec.add_dependency "timers", "~> 4.1"
+	spec.add_dependency "io-event", "~> 1.6"
 end

benchmark/timers/after_0.rb

@@ -0,0 +1,35 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# Released under the MIT License.
+# Copyright, 2024, by Samuel Williams.
+
+require 'benchmark/ips'
+
+require 'timers'
+require 'io/event/timers'
+
+Benchmark.ips do |benchmark|
+	benchmark.time = 1
+	benchmark.warmup = 1
+
+	benchmark.report("Timers::Group") do |count|
+		timers = Timers::Group.new
+
+		while count > 0
+			timers.after(0) {count -= 1}
+			timers.fire
+		end
+	end
+
+	benchmark.report("IO::Event::Timers") do |count|
+		timers = IO::Event::Timers.new
+
+		while count > 0
+			timers.after(0) {count -= 1}
+			timers.fire
+		end
+	end
+
+	benchmark.compare!
+end

benchmark/timers/after_cancel.rb

@@ -0,0 +1,41 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# Released under the MIT License.
+# Copyright, 2024, by Samuel Williams.
+
+require 'benchmark/ips'
+
+require 'timers'
+require 'io/event/timers'
+
+Benchmark.ips do |benchmark|
+	benchmark.time = 1
+	benchmark.warmup = 1
+
+	benchmark.report("Timers::Group") do |count|
+		timers = Timers::Group.new
+
+		while count > 0
+			timer = timers.after(0) {}
+			timer.cancel
+			count -= 1
+		end
+
+		timers.fire
+	end
+
+	benchmark.report("IO::Event::Timers") do |count|
+		timers = IO::Event::Timers.new
+
+		while count > 0
+			timer = timers.after(0) {}
+			timer.cancel!
+			count -= 1
+		end
+
+		timers.fire
+	end
+
+	benchmark.compare!
+end

benchmark/timers/after_n.rb

@@ -0,0 +1,39 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# Released under the MIT License.
+# Copyright, 2024, by Samuel Williams.
+
+require 'benchmark/ips'
+
+require 'timers'
+require 'io/event/timers'
+
+Benchmark.ips do |benchmark|
+	benchmark.time = 1
+	benchmark.warmup = 1
+
+	benchmark.report("Timers::Group") do |count|
+		timers = Timers::Group.new
+
+		while count > 0
+			timers.after(0) {}
+			count -= 1
+		end
+
+		timers.fire
+	end
+
+	benchmark.report("IO::Event::Timers") do |count|
+		timers = IO::Event::Timers.new
+
+		while count > 0
+			timers.after(0) {}
+			count -= 1
+		end
+
+		timers.fire
+	end
+
+	benchmark.compare!
+end

lib/async/scheduler.rb

@@ -11,7 +11,6 @@
 require 'io/event'
 
 require 'console'
-require 'timers'
 require 'resolv'
 
 module Async
@@ -40,7 +39,7 @@ def initialize(parent = nil, selector: nil)
 			@busy_time = 0.0
 			@idle_time = 0.0
 
-			@timers = ::Timers::Group.new
+			@timers = ::IO::Event::Timers.new
 		end
 
 		# Compute the scheduler load according to the busy and idle times that are updated by the run loop.
@@ -165,7 +164,7 @@ def block(blocker, timeout)
 				@blocked -= 1
 			end
 		ensure
-			timer&.cancel
+			timer&.cancel!
 		end
 
 		# @asynchronous May be called from any thread.
@@ -225,7 +224,7 @@ def io_wait(io, events, timeout = nil)
 
 			return @selector.io_wait(fiber, io, events)
 		ensure
-			timer&.cancel
+			timer&.cancel!
 		end
 
 		if ::IO::Event::Support.buffer?
@@ -240,7 +239,7 @@ def io_read(io, buffer, length, offset = 0)
 
 				@selector.io_read(fiber, io, buffer, length, offset)
 			ensure
-				timer&.cancel
+				timer&.cancel!
 			end
 
 			if RUBY_ENGINE != "ruby" || RUBY_VERSION >= "3.3.1"
@@ -255,7 +254,7 @@ def io_write(io, buffer, length, offset = 0)
 
 					@selector.io_write(fiber, io, buffer, length, offset)
 				ensure
-					timer&.cancel
+					timer&.cancel!
 				end
 			end
 		end
@@ -416,7 +415,7 @@ def with_timeout(duration, exception = TimeoutError, message = "execution expire
 
 			yield timer
 		ensure
-			timer.cancel if timer
+			timer&.cancel!
 		end
 
 		def timeout_after(duration, exception, message, &block)

readme.md

@@ -1,7 +1,6 @@
 # ![Async](logo.svg)
 
-Async is a composable asynchronous I/O framework for Ruby based on [io-event](https://github.com/socketry/io-event) and
-[timers](https://github.com/socketry/timers).
+Async is a composable asynchronous I/O framework for Ruby based on [io-event](https://github.com/socketry/io-event).
 
 > "Lately I've been looking into `async`, as one of my projects –
 > [tus-ruby-server](https://github.com/janko/tus-ruby-server) – would really benefit from non-blocking I/O. It's really