Project

General

Profile

Actions

Bug #18129

open

Ractor-incompatible global variables can be accessed through alias

Added by rm155 (Rohit Menon) 2 months ago.

Status:
Open
Priority:
Normal
Assignee:
-
Target version:
-
[ruby-core:105058]

Description

Some global variables are not allowed in non-main Ractors. For example, the following code does not run:

Ractor.new do
  $/
end.take
#=> can not access global variables $/ from non-main Ractors (Ractor::IsolationError)

This error message is expected because $/ is not allowed outside the main Ractor.

However, if the variable is aliased, it sometimes bypasses this. For example, the following code sometimes runs unexpectedly without error:

alias $alias_global_variable $/
Ractor.new do
  $alias_global_variable
end.take

Sometimes, it correctly fails with the message “can not access global variables $alias_global_variable from non-main Ractors (Ractor::IsolationError)”. However, because the global variable is sometimes accessed without error, this could lead to data races.

No data to display

Actions

Also available in: Atom PDF