merge revision(s) 59030,59031: [Backport #13638]

	thread.c: avoid busy looping on rb_thread_fd_close

	We no longer use it this function, but extensions do, and
	we need to ensure it continues to work for them.

	* thread.c (rb_thread_fd_close): schedule other threads in loop
	* ext/-test-/thread_fd_close/thread_fd_close.c: new file
	* ext/-test-/thread_fd_close/depend: ditto
	* ext/-test-/thread_fd_close/extconf.rb: ditto
	* test/-ext-/thread_fd_close/test_thread_fd_close.rb: new test
	* properties.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@59295 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/thread.c b/thread.c
index 2691fd835d..4fb46dc43a 100644
--- a/thread.c
+++ b/thread.c
@@ -2227,7 +2227,7 @@ rb_notify_fd_close(int fd)
 void
 rb_thread_fd_close(int fd)
 {
-    while (rb_notify_fd_close(fd));
+    while (rb_notify_fd_close(fd)) rb_thread_schedule();
 }
 
 /*