Introduce Ractor mechanism for parallel execution

This commit introduces Ractor mechanism to run Ruby program in
parallel. See doc/ractor.md for more details about Ractor.
See ticket [Feature #17100] to see the implementation details
and discussions.

[Feature #17100]

This commit does not complete the implementation. You can find
many bugs on using Ractor. Also the specification will be changed
so that this feature is experimental. You will see a warning when
you make the first Ractor with `Ractor.new`.

I hope this feature can help programmers from thread-safety issues.

1 files changed, 2 insertions, 0 deletions

diff --git a/inits.c b/inits.c
index ad57b754a4..a3eec164bb 100644
--- a/inits.c
+++ b/inits.c
@@ -60,6 +60,7 @@ rb_call_inits(void)
     CALL(Math);
     CALL(GC);
     CALL(Enumerator);
+    CALL(Ractor);
     CALL(VM);
     CALL(ISeq);
     CALL(Thread);
@@ -82,6 +83,7 @@ rb_call_builtin_inits(void)
 {
 #define BUILTIN(n) CALL(builtin_##n)
     BUILTIN(gc);
+    BUILTIN(ractor);
     BUILTIN(integer);
     BUILTIN(io);
     BUILTIN(dir);