Introduce `Fiber::Scheduler#io_select` hook for non-blocking `IO.select`. (#6559)

1 files changed, 9 insertions, 0 deletions

diff --git a/io.c b/io.c
index 2fe092b84e..a1b3f27611 100644
--- a/io.c
+++ b/io.c
@@ -10851,6 +10851,15 @@ rb_io_advise(int argc, VALUE *argv, VALUE io)
 static VALUE
 rb_f_select(int argc, VALUE *argv, VALUE obj)
 {
+    VALUE scheduler = rb_fiber_scheduler_current();
+    if (scheduler != Qnil) {
+        // It's optionally supported.
+        VALUE result = rb_fiber_scheduler_io_selectv(scheduler, argc, argv);
+        if (result != Qundef) {
+            return result;
+        }
+    }
+
     VALUE timeout;
     struct select_args args;
     struct timeval timerec;