Issue #8444 has been updated by jemmai (Jemma Issroff). Status changed from Open to Closed This bug is not reproducible for Ruby > 2.7.5. It has clearly been fixed, closing! ---------------------------------------- Bug #8444: Regexp vars $~ and friends are not thread local https://bugs.ruby-lang.org/issues/8444#change-105305 * Author: jamespharaoh (James Pharaoh) * Status: Closed * Priority: Normal * Assignee: ko1 (Koichi Sasada) * ruby -v: trunk ---------------------------------------- =begin In the docs for the Regexp special variables, $~ and friends, it says "These global variables are thread-local and method-local variables". However the following gives an unexpected result: def get_proc proc do |str| str =~ /(.+)/ sleep 0.1 puts "got #{$1} from #{str}\n" end end proc = get_proc t1 = Thread.new { proc.call "abc" } t2 = Thread.new { proc.call "def" } t1.join t2.join This outputs the following: got abc from abc got abc from def The expected result is of course: got abc from abc got def from def Clearly the variables are being scoped to the get_proc method and are being shared by both threads. This runs contrary to the documentation and also to expectations. This behaviour should either be changed, or the documentation updated to reflect the actual behaviour. Interestingly, the following does work as expected: proc = proc do |str| str =~ /(.+)/ sleep 0.1 puts "got #{$1} from #{str}\n" end t1 = Thread.new { proc.call "abc" } t2 = Thread.new { proc.call "def" } t1.join t2.join =end -- https://bugs.ruby-lang.org/