Change test-all suite to enable testing each test in a separate ractor.

This tests for ractor safety issues as well as issues with GC and the
ractor scheduler. It also tests move/copy logic because it uses these
internally for running the tests.

You can enable these tests with RUBY_TESTS_WITH_RACTORS=1 when running
`make test-all TESTS=test/ruby`. These ractor tests are currently only
working for tests under the "test/ruby" directory, so don't run any
others with this ENV var set or you will get errors.

Currently there are GC issues with ractors so in tool/lib/test/unit.rb, I disable the
GC before running any of the tests (for now). If you uncomment this, you will get
errors and you can debug the GC issues.

Author: luke-gruber

ext/-test-/file/fs.c

@@ -105,6 +105,9 @@ get_noatime_p(VALUE self, VALUE str)
 void
 Init_fs(VALUE module)
 {
+#ifdef HAVE_RB_EXT_RACTOR_SAFE
+    rb_ext_ractor_safe(true);
+#endif
     VALUE fs = rb_define_module_under(module, "Fs");
     rb_define_module_function(fs, "fsname", get_fsname, 1);
     rb_define_module_function(fs, "noatime?", get_noatime_p, 1);

ext/-test-/integer/init.c

@@ -5,6 +5,9 @@
 void
 Init_integer(void)
 {
+#ifdef HAVE_RB_EXT_RACTOR_SAFE
+    rb_ext_ractor_safe(true);
+#endif
     VALUE mBug = rb_define_module("Bug");
     VALUE klass = rb_define_class_under(mBug, "Integer", rb_cObject);
     TEST_INIT_FUNCS(init);

ext/-test-/iter/break.c

@@ -19,6 +19,10 @@ iter_break_value(VALUE self, VALUE val)
 void
 Init_break(VALUE klass)
 {
+#ifdef HAVE_RB_EXT_RACTOR_SAFE
+    // Mark this extension as Ractor-safe.
+    rb_ext_ractor_safe(true);
+#endif
     VALUE breakable = rb_define_module_under(klass, "Breakable");
     rb_define_module_function(breakable, "iter_break", iter_break, 0);
     rb_define_module_function(breakable, "iter_break_value", iter_break_value, 1);

ext/-test-/iter/init.c

@@ -5,6 +5,11 @@
 void
 Init_iter(void)
 {
+
+#ifdef HAVE_RB_EXT_RACTOR_SAFE
+    // Mark this extension as Ractor-safe.
+    rb_ext_ractor_safe(true);
+#endif
     VALUE mBug = rb_define_module("Bug");
     VALUE klass = rb_define_module_under(mBug, "Iter");
     TEST_INIT_FUNCS(init);

ext/-test-/iter/yield.c

@@ -10,6 +10,11 @@ yield_block(int argc, VALUE *argv, VALUE self)
 void
 Init_yield(VALUE klass)
 {
+
+#ifdef HAVE_RB_EXT_RACTOR_SAFE
+    // Mark this extension as Ractor-safe.
+    rb_ext_ractor_safe(true);
+#endif
     VALUE yield = rb_define_module_under(klass, "Yield");
 
     rb_define_method(yield, "yield_block", yield_block, -1);

ext/-test-/rb_call_super_kw/rb_call_super_kw.c

@@ -9,6 +9,10 @@ rb_call_super_kw_m(int argc, VALUE *argv, VALUE self)
 void
 Init_rb_call_super_kw(void)
 {
+#ifdef HAVE_RB_EXT_RACTOR_SAFE
+    // Mark this extension as Ractor-safe.
+    rb_ext_ractor_safe(true);
+#endif
     VALUE module = rb_define_module("Bug");
     module = rb_define_module_under(module, "RbCallSuperKw");
     rb_define_method(module, "m", rb_call_super_kw_m, -1);

test/fileutils/test_fileutils.rb

@@ -84,13 +84,10 @@ def check_have_hardlink?
       return true
     end
 
-    @@no_broken_symlink = false
-    if /cygwin/ =~ RUBY_PLATFORM and /\bwinsymlinks:native(?:strict)?\b/ =~ ENV["CYGWIN"]
-      @@no_broken_symlink = true
-    end
+    NO_BROKEN_SYMLINK = /cygwin/ =~ RUBY_PLATFORM and /\bwinsymlinks:native(?:strict)?\b/ =~ ENV["CYGWIN"]
 
     def no_broken_symlink?
-      @@no_broken_symlink
+      NO_BROKEN_SYMLINK
     end
 
     def has_capsh?
@@ -196,7 +193,7 @@ def teardown
   end
 
 
-  TARGETS = %w( data/a data/all data/random data/zero )
+  TARGETS = %w( data/a data/all data/random data/zero ).freeze
 
   def prepare_data_file
     File.open('data/a', 'w') {|f|

test/ruby/enc/test_case_comprehensive.rb

@@ -5,8 +5,8 @@
 
 class TestComprehensiveCaseMapping < Test::Unit::TestCase
   UNICODE_VERSION = RbConfig::CONFIG['UNICODE_VERSION']
-  path = File.expand_path("../../../enc/unicode/data/#{UNICODE_VERSION}", __dir__)
-  UNICODE_DATA_PATH = File.directory?("#{path}/ucd") ? "#{path}/ucd" : path
+  path = File.expand_path("../../../enc/unicode/data/#{UNICODE_VERSION}", __dir__).freeze
+  UNICODE_DATA_PATH = File.directory?("#{path}/ucd") ? "#{path}/ucd".freeze : path
 
   def self.hex2utf8(s)
     s.split(' ').map { |c| c.to_i(16) }.pack('U*')
@@ -29,7 +29,7 @@ def test_data_files_available
   end
 end
 
-TestComprehensiveCaseMapping.data_files_available? and  class TestComprehensiveCaseMapping
+TestComprehensiveCaseMapping.data_files_available? && will_run_in_main_ractor? && class TestComprehensiveCaseMapping
   (CaseTest = Struct.new(:method_name, :attributes, :first_data, :follow_data)).class_eval do
     def initialize(method_name, attributes, first_data, follow_data=first_data)
       super

test/ruby/enc/test_emoji_breaks.rb

@@ -46,15 +46,16 @@ def self.files
   end
 
   UNICODE_VERSION   = RbConfig::CONFIG['UNICODE_VERSION']
-  UNICODE_DATA_PATH = File.expand_path("../../../enc/unicode/data/#{UNICODE_VERSION}/ucd/emoji", __dir__)
+  UNICODE_DATA_PATH = File.expand_path("../../../enc/unicode/data/#{UNICODE_VERSION}/ucd/emoji", __dir__).freeze
   EMOJI_VERSION     = RbConfig::CONFIG['UNICODE_EMOJI_VERSION']
-  EMOJI_DATA_PATH   = File.expand_path("../../../enc/unicode/data/emoji/#{EMOJI_VERSION}", __dir__)
+  EMOJI_DATA_PATH   = File.expand_path("../../../enc/unicode/data/emoji/#{EMOJI_VERSION}", __dir__).freeze
 
   EMOJI_DATA_FILES  = %w[emoji-sequences emoji-test emoji-zwj-sequences].map do |basename|
     BreakFile.new(basename, EMOJI_DATA_PATH, EMOJI_VERSION)
   end
   UNICODE_DATA_FILE = BreakFile.new('emoji-variation-sequences', UNICODE_DATA_PATH, UNICODE_VERSION)
   EMOJI_DATA_FILES << UNICODE_DATA_FILE
+  Ractor.make_shareable(EMOJI_DATA_FILES)
 
   def self.data_files_available?
     EMOJI_DATA_FILES.all? do |f|

test/ruby/enc/test_grapheme_breaks.rb

@@ -27,9 +27,9 @@ def initialize(line_number, data, comment)
   end
 
   UNICODE_VERSION = RbConfig::CONFIG['UNICODE_VERSION']
-  path = File.expand_path("../../../enc/unicode/data/#{UNICODE_VERSION}", __dir__)
-  UNICODE_DATA_PATH = File.directory?("#{path}/ucd/auxiliary") ? "#{path}/ucd/auxiliary" : path
-  GRAPHEME_BREAK_TEST_FILE = File.expand_path("#{UNICODE_DATA_PATH}/GraphemeBreakTest.txt", __dir__)
+  path = File.expand_path("../../../enc/unicode/data/#{UNICODE_VERSION}", __dir__).freeze
+  UNICODE_DATA_PATH = File.directory?("#{path}/ucd/auxiliary") ? "#{path}/ucd/auxiliary".freeze : path
+  GRAPHEME_BREAK_TEST_FILE = File.expand_path("#{UNICODE_DATA_PATH}/GraphemeBreakTest.txt", __dir__).freeze
 
   def self.file_available?
     File.exist? GRAPHEME_BREAK_TEST_FILE
@@ -44,20 +44,22 @@ def test_data_files_available
   if file_available?
     def read_data
       tests = []
+      lineno = 1
       File.foreach(GRAPHEME_BREAK_TEST_FILE, encoding: Encoding::UTF_8) do |line|
-        if $. == 1 and not line.start_with?("# GraphemeBreakTest-#{UNICODE_VERSION}.txt")
+        if lineno == 1 and not line.start_with?("# GraphemeBreakTest-#{UNICODE_VERSION}.txt")
           raise "File Version Mismatch"
         end
+        lineno += 1
         next if /\A#/.match? line
         tests << BreakTest.new($., *line.chomp.split('#')) rescue 'whatever'
       end
       tests
     end
 
     def all_tests
-      @@tests ||= read_data
+      @grapheme_breaks_tests ||= read_data
     rescue Errno::ENOENT
-      @@tests ||= []
+      @grapheme_breaks_tests ||= []
     end
 
     def test_each_grapheme_cluster