merge revision(s) 66708: [Backport #15499]

	thread.c (call_without_gvl): spawn thread for UBF iff single-threaded

	We need another native thread to call some unblocking functions
	which aren't RUBY_UBF_IO or RUBY_UBF_PROCESS.  Instead of a
	permanent thread in <= 2.5, we can now rely on the thread cache
	feature to perform interrupts.

	[ruby-core:90865] [Bug #15499]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@66940 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/version.h b/version.h
index e16812c628..da5327b96c 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.6.1"
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 30
+#define RUBY_PATCHLEVEL 31
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 1