merge revision(s) 58534: [Backport #13533]

	nogvl_wait_for_single_fd must wait as its name

	poll(fds, n, 0) mean no timeout and immediately return. If you want to
	wait something, you need to use -1 instead.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@58622 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/io.c b/io.c
index 9f10d8f8f5..943d1fe3c0 100644
--- a/io.c
+++ b/io.c
@@ -10208,7 +10208,7 @@ nogvl_wait_for_single_fd(int fd, short events)
     fds.fd = fd;
     fds.events = events;
 
-    return poll(&fds, 1, 0);
+    return poll(&fds, 1, -1);
 }
 
 static int