per-ractor Random::DEFAULT

Random generators are not Ractor-safe, so we need to prepare
per-ractor default random genearators. This patch set
`Random::DEFAULT = Randm` (not a Random instance, but the Random
class) and singleton methods like `Random.rand()` use a per-ractor
random generator.

[Feature #17322]

1 files changed, 2 insertions, 0 deletions

diff --git a/ractor_core.h b/ractor_core.h
index 07528cc69c..dd662141a0 100644
--- a/ractor_core.h
+++ b/ractor_core.h
@@ -127,6 +127,8 @@ struct rb_ractor_struct {
     VALUE verbose;
     VALUE debug;
 
+    void *default_rand; // used in random.c
+
     // gc.c rb_objspace_reachable_objects_from
     struct gc_mark_func_data_struct {
         void *data;