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Ractor: lock around global variable get/set

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There's a global id_table `rb_global_tbl` that needs a lock (I used VM lock). In the future, we might use a lock-free rb_id_table if we create such a data structure.

Reproduction script that might crash or behave strangely:

```ruby
100.times do
  Ractor.new do
    1_000_000.times do
      $stderr
      $stdout
      $stdin
      $VERBOSE
      $stderr
      $stdout
      $stdin
      $VERBOSE
      $stderr
      $stdout
      $stdin
      $VERBOSE
    end
  end
end

$myglobal0 = nil;
$myglobal1 = nil;
  # ... vim macros to the rescue
$myglobal100000 = nil;
```
This commit is contained in:
Luke Gruber 2025-07-03 17:43:37 -04:00 • committed by Jean Boussier
parent c3d91eb4d9
commit be58cd4d7d
2 changed files with 81 additions and 70 deletions
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8
bootstraptest/test_ractor.rb
View file

@ -588,8 +588,8 @@ assert_equal 'true', %q{
r.value[:frozen]
}
# Access to global-variables are prohibited
assert_equal 'can not access global variables $gv from non-main Ractors', %q{
# Access to global-variables are prohibited (read)
assert_equal 'can not access global variable $gv from non-main Ractor', %q{
$gv = 1
r = Ractor.new do
$gv
@ -602,8 +602,8 @@ assert_equal 'can not access global variables $gv from non-main Ractors', %q{
end
}
# Access to global-variables are prohibited
assert_equal 'can not access global variables $gv from non-main Ractors', %q{
# Access to global-variables are prohibited (write)
assert_equal 'can not access global variable $gv from non-main Ractor', %q{
r = Ractor.new do
$gv = 1
end