Issue #21037 has been updated by luke-gru (Luke Gruber). Maybe this fixes it? https://github.com/ruby/ruby/pull/12520 ---------------------------------------- Bug #21037: Ractors hang with multiple threads https://bugs.ruby-lang.org/issues/21037#change-111537 * Author: tenderlovemaking (Aaron Patterson) * Status: Open * ruby -v: ruby 3.5.0dev (2025-01-14T20:59:39Z master f1e32914eb) +PRISM [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- The following program hangs, but I don't expect it to hang: ```ruby # frozen_string_literal: true class Map def initialize @r = Ractor.new { cache = { "int" => "integer", "bool" => "boolean" } loop do key = receive Ractor.yield key end } freeze end def fetch(key) @r.send key m = @r.take raise unless key == m m end end tm = Map.new t1 = Thread.new { 10.times { |i| p [i + 1,tm.fetch("int")] } } t2 = Thread.new { 10.times { |i| p [i + 1, tm.fetch("bool")] } } t1.join t2.join ``` I'm not sure why this program hangs yet, but it does both on macOS and Linux. I've tested with master, Ruby 3.4, and Ruby 3.3. I'm not sure why it's hanging yet, but I wanted to file an issue. -- https://bugs.ruby-lang.org/

Issue #21037 has been updated by luke-gru (Luke Gruber). I created a PR here: https://github.com/ruby/ruby/pull/12633. I don't know how to get it working for Win32 builds yet, I'll have to take a closer look at that. ---------------------------------------- Bug #21037: Ractors hang with multiple threads https://bugs.ruby-lang.org/issues/21037#change-111656 * Author: tenderlovemaking (Aaron Patterson) * Status: Open * ruby -v: ruby 3.5.0dev (2025-01-14T20:59:39Z master f1e32914eb) +PRISM [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- The following program hangs, but I don't expect it to hang: ```ruby # frozen_string_literal: true class Map def initialize @r = Ractor.new { cache = { "int" => "integer", "bool" => "boolean" } loop do key = receive Ractor.yield key end } freeze end def fetch(key) @r.send key m = @r.take raise unless key == m m end end tm = Map.new t1 = Thread.new { 10.times { |i| p [i + 1,tm.fetch("int")] } } t2 = Thread.new { 10.times { |i| p [i + 1, tm.fetch("bool")] } } t1.join t2.join ``` I'm not sure why this program hangs yet, but it does both on macOS and Linux. I've tested with master, Ruby 3.4, and Ruby 3.3. I'm not sure why it's hanging yet, but I wanted to file an issue. -- https://bugs.ruby-lang.org/

Issue #21037 has been updated by tenderlovemaking (Aaron Patterson). Status changed from Assigned to Closed Fixed in 1d4822a ---------------------------------------- Bug #21037: Ractors hang with multiple threads https://bugs.ruby-lang.org/issues/21037#change-113260 * Author: tenderlovemaking (Aaron Patterson) * Status: Closed * Assignee: ractor * ruby -v: ruby 3.5.0dev (2025-01-14T20:59:39Z master f1e32914eb) +PRISM [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- The following program hangs, but I don't expect it to hang: ```ruby # frozen_string_literal: true class Map def initialize @r = Ractor.new { cache = { "int" => "integer", "bool" => "boolean" } loop do key = receive Ractor.yield key end } freeze end def fetch(key) @r.send key m = @r.take raise unless key == m m end end tm = Map.new t1 = Thread.new { 10.times { |i| p [i + 1,tm.fetch("int")] } } t2 = Thread.new { 10.times { |i| p [i + 1, tm.fetch("bool")] } } t1.join t2.join ``` I'm not sure why this program hangs yet, but it does both on macOS and Linux. I've tested with master, Ruby 3.4, and Ruby 3.3. I'm not sure why it's hanging yet, but I wanted to file an issue. -- https://bugs.ruby-lang.org/