From 4adb79f8aaddba977eac52600dffa5b5610ced39 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 4 Nov 2025 18:03:47 +0900
Subject: [ruby/io-wait] Deprecate `IO#nread` and `IO#ready?`

To use these methods, busy loop is necessary somewhere.
Use other method to wait instead.

https://github.com/ruby/io-wait/commit/8ff4821cea
---
 ext/io/wait/wait.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ext/io/wait/wait.c b/ext/io/wait/wait.c
index bec04cb727..d9653e9c34 100644
--- a/ext/io/wait/wait.c
+++ b/ext/io/wait/wait.c
@@ -83,6 +83,7 @@ io_nread(VALUE io)
     int len;
     ioctl_arg n;
 
+    rb_category_warn(RB_WARN_CATEGORY_DEPRECATED, "IO#nread is deprecated; use wait_readable instead");
     GetOpenFile(io, fptr);
     rb_io_check_char_readable(fptr);
     len = rb_io_read_pending(fptr);
@@ -142,6 +143,7 @@ io_ready_p(VALUE io)
     struct timeval tv = {0, 0};
 #endif
 
+    rb_category_warn(RB_WARN_CATEGORY_DEPRECATED, "IO#ready? is deprecated; use wait_readable instead");
     GetOpenFile(io, fptr);
     rb_io_check_char_readable(fptr);
     if (rb_io_read_pending(fptr)) return Qtrue;
-- 
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