reload FD after rb_io_wait_*able functions

The file descriptor may be closed while GVL is released,
so we must reload the descriptor before and after calling
rb_io_wait_*able functions.

We reload before calling rb_io_wait_*able because the GVL was
released for the function call (read/write) which triggered
EAGAIN.

We reload after calling rb_io_wait_*able because
rb_io_wait_*able releases the GVL, too.

1 files changed, 2 insertions, 2 deletions

diff --git a/ext/sleepy_penguin/eventfd.c b/ext/sleepy_penguin/eventfd.c
index 9d75c91..3ba8397 100644
--- a/ext/sleepy_penguin/eventfd.c
+++ b/ext/sleepy_penguin/eventfd.c
@@ -91,7 +91,7 @@ retry:
         if (w == -1) {
                 if (errno == EAGAIN && RTEST(nonblock))
                         return Qfalse;
-                if (rb_io_wait_writable(x.fd))
+                if (rb_sp_wait(rb_io_wait_writable, self, &x.fd))
                         goto retry;
                 rb_sys_fail("write(eventfd)");
         }
@@ -127,7 +127,7 @@ retry:
         if (w == -1) {
                 if (errno == EAGAIN && RTEST(nonblock))
                         return Qnil;
-                if (rb_io_wait_readable(x.fd = rb_sp_fileno(self)))
+                if (rb_sp_wait(rb_io_wait_readable, self, &x.fd))
                         goto retry;
                 rb_sys_fail("read(eventfd)");
         }