From 99310e3eb56fbc85bb45119285812eb959448d0c Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Tue, 20 Oct 2020 10:46:43 +0900
Subject: Some global variables can be accessed from ractors

Some global variables should be used from non-main Ractors.
[Bug #17268]

```ruby
     # ractor-local (derived from created ractor): debug
     '$DEBUG' => $DEBUG,
     '$-d' => $-d,

     # ractor-local (derived from created ractor): verbose
     '$VERBOSE' => $VERBOSE,
     '$-w' => $-w,
     '$-W' => $-W,
     '$-v' => $-v,

     # process-local (readonly): other commandline parameters
     '$-p' => $-p,
     '$-l' => $-l,
     '$-a' => $-a,

     # process-local (readonly): getpid
     '$$'  => $$,

     # thread local: process result
     '$?'  => $?,

     # scope local: match
     '$~'  => $~.inspect,
     '$&'  => $&,
     '$`'  => $`,
     '$\''  => $',
     '$+'  => $+,
     '$1'  => $1,

     # scope local: last line
     '$_' => $_,

     # scope local: last backtrace
     '$@' => $@,
     '$!' => $!,

     # ractor local: stdin, out, err
     '$stdin'  => $stdin.inspect,
     '$stdout' => $stdout.inspect,
     '$stderr' => $stderr.inspect,
```
---
 eval.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'eval.c')

diff --git a/eval.c b/eval.c
index 87c048be3f..9a10cb46b1 100644
--- a/eval.c
+++ b/eval.c
@@ -2084,6 +2084,9 @@ Init_eval(void)
     rb_define_virtual_variable("$@", errat_getter, errat_setter);
     rb_define_virtual_variable("$!", errinfo_getter, 0);
 
+    rb_gvar_ractor_local("$@");
+    rb_gvar_ractor_local("$!");
+
     rb_define_global_function("raise", f_raise, -1);
     rb_define_global_function("fail", f_raise, -1);
 
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