From: "kjtsanaktsidis (KJ Tsanaktsidis) via ruby-core" Date: 2023-09-12T03:58:44+00:00 Subject: [ruby-core:114681] [Ruby master Bug#19873] Thread#native_thread_id is incorrectly cached across fork on Linux Issue #19873 has been reported by kjtsanaktsidis (KJ Tsanaktsidis). ---------------------------------------- Bug #19873: Thread#native_thread_id is incorrectly cached across fork on Linux https://bugs.ruby-lang.org/issues/19873 * Author: kjtsanaktsidis (KJ Tsanaktsidis) * Status: Open * Priority: Normal * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- On Linux, when a process forks, the native thread ID of the (only) thread in the forked child should change. ``` >> libc = Fiddle.dlopen(nil) => # >> gettid = Fiddle::Function.new(libc['gettid'], [], Fiddle::TYPE_INT) => #> gettid.call => 33 >> fork { puts gettid.call }; nil; => nil 36 ``` However, the value of `Thread#native_thread_id` is (incorrectly) still set to the old value. ``` >> Thread.current.native_thread_id => 33 >> fork { puts Thread.current.native_thread_id }; nil; => nil 33 ``` I think `#native_thread_id` should be re-fetched from the operating system via `gettid(2)` after fork. -- https://bugs.ruby-lang.org/ ______________________________________________ ruby-core mailing list -- ruby-core@ml.ruby-lang.org To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org ruby-core info -- https://ml.ruby-lang.org/mailman3/postorius/lists/ruby-core.ml.ruby-lang.org/