based on the patch by Eric Wong. [ruby-core:36156]
* vm_core.h (rb_thread_call_with_gvl): don't declare here.
* thread.c: include internal.h.
(rb_thread_execute_interrupts): new function.
* internal.h (rb_thread_execute_interrupts): declared.
(rb_thread_call_with_gvl): declared.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31971 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
type check to get rid of a double free when main Thread has singleton
class. [ruby-core:36741] [Bug #4828]
* thread.c (rb_obj_is_mutex): add a new utility function.
* vm.c (rb_obj_is_thread): ditto.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31968 b2dd03c8-39d4-4d8f-98ff-823fe69b080e