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, 1 deletions

diff --git a/process.c b/process.c
index fb8d26afa5..34dd986953 100644
--- a/process.c
+++ b/process.c
@@ -112,6 +112,7 @@ int initgroups(const char *, rb_gid_t);
 #include "ruby/thread.h"
 #include "ruby/util.h"
 #include "vm_core.h"
+#include "ractor_pub.h"
 
 /* define system APIs */
 #ifdef _WIN32
@@ -4342,7 +4343,7 @@ rb_f_abort(int argc, const VALUE *argv)
 
 	args[1] = args[0] = argv[0];
 	StringValue(args[0]);
-	rb_io_puts(1, args, rb_stderr);
+	rb_io_puts(1, args, rb_ractor_stderr());
 	args[0] = INT2NUM(EXIT_FAILURE);
 	rb_exc_raise(rb_class_new_instance(2, args, rb_eSystemExit));
     }