* thread.c (rb_thread_select): release GVL while waiting select().

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31400 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 1 deletions

diff --git a/thread.c b/thread.c
index 53e1a4ed95..dd40be0ece 100644
--- a/thread.c
+++ b/thread.c
@@ -2672,7 +2672,17 @@ rb_thread_select(int max, fd_set * read, fd_set * write, fd_set * except,
 	return 0;
     }
     else {
-	return select(max, read, write, except, timeout);
+	int lerrno;
+	int result;
+
+	BLOCKING_REGION({
+		result = select(max, read, write, except, timeout);
+		if (result < 0)
+		    lerrno = errno;
+	    }, ubf_select, GET_THREAD());
+	errno = lerrno;
+
+	return result;
     }
 }