From cd50cf37d997262402c75d378cf3409fcaa734bc Mon Sep 17 00:00:00 2001
From: tufusa <me@tufusa.net>
Date: Mon, 25 May 2026 22:26:18 +0900
Subject: [PATCH 1/2] =?UTF-8?q?feat:=20`Mutex`=20=E3=82=AF=E3=83=A9?=
 =?UTF-8?q?=E3=82=B9=E3=82=92=E5=AE=9A=E7=BE=A9?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 core/mutex.rbs | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 core/mutex.rbs

diff --git a/core/mutex.rbs b/core/mutex.rbs
new file mode 100644
index 0000000..4040225
--- /dev/null
+++ b/core/mutex.rbs
@@ -0,0 +1,13 @@
+class Mutex
+  def initialize: () -> void
+
+  def lock: () -> self
+
+  def unlock: () -> self
+
+  def try_lock: () -> bool
+
+  def locked?: () -> bool
+
+  def owned?: () -> bool
+end

From c7fa93cb8194f1c0a7cc86add485625f0e517135 Mon Sep 17 00:00:00 2001
From: tufusa <me@tufusa.net>
Date: Mon, 25 May 2026 22:26:43 +0900
Subject: [PATCH 2/2] =?UTF-8?q?chore:=20=E3=83=86=E3=82=B9=E3=83=88?=
 =?UTF-8?q?=E3=82=92=E8=BF=BD=E5=8A=A0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 test/mutex.rb | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 test/mutex.rb

diff --git a/test/mutex.rb b/test/mutex.rb
new file mode 100644
index 0000000..9ca5d54
--- /dev/null
+++ b/test/mutex.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+mutex = Mutex.new
+
+mutex.lock
+
+mutex.unlock
+
+mutex.try_lock
+
+mutex.locked?
+
+mutex.owned?