merges r21185 from trunk into ruby_1_9_1.

* thread.c (rb_thread_blocking_region): add a comment.
* thread.c (rb_thread_call_without_gvl): added as a alias of
  rb_thread_blocking_region().
* thread.c (rb_thread_call_with_gvl): added.
* vm_core.h (rb_thread_t#blocking_region_buffer): added for
  rb_thread_call_with_gvl().

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@21198 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/vm_core.h b/vm_core.h
index c3f5c013f9..b2ebbc8155 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -363,6 +363,7 @@ typedef struct rb_thread_struct
     int slice;
 
     native_thread_data_t native_thread_data;
+    void *blocking_region_buffer;
 
     VALUE thgroup;
     VALUE value;