process.c (ruby_fork_ruby): fix race in signal handling We must block signals before stopping timer-thread, otherwise signal handing may be delayed until (and if) another signal is received after timer-thread is restarted. [ruby-core:87622] [Bug #14868] [Bug #13916]
merge revision(s) 63741: [Backport #14868]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@64130 b2dd03c8-39d4-4d8f-98ff-823fe69b080e