From 455430acbabc2662520ba46e61d509d0ff42f281 Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Mon, 28 Sep 2026 22:03:59 +0900
Subject: [PATCH] Add `Thread.ignore_deadlock`

---
 core/thread.rbs            | 31 +++++++++++++++++++++++++++++++
 test/stdlib/Thread_test.rb |  4 ++++
 2 files changed, 35 insertions(+)

diff --git a/core/thread.rbs b/core/thread.rbs
index 59b2c6957..70b968035 100644
--- a/core/thread.rbs
+++ b/core/thread.rbs
@@ -169,6 +169,37 @@ class Thread < Object
   #
   def self.main: () -> Thread
 
+  # <!--
+  #   rdoc-file=thread.c
+  #   - Thread.ignore_deadlock -> true or false
+  # -->
+  # Returns the status of the global ``ignore deadlock'' condition. The default is
+  # `false`, so that deadlock conditions are not ignored.
+  #
+  # See also ::ignore_deadlock=.
+  #
+  def self.ignore_deadlock: () -> bool
+
+  # <!--
+  #   rdoc-file=thread.c
+  #   - Thread.ignore_deadlock = boolean   -> true or false
+  # -->
+  # Returns the new state. When set to `true`, the VM will not check for deadlock
+  # conditions. It is only useful to set this if your application can break a
+  # deadlock condition via some other means, such as a signal.
+  #
+  #     Thread.ignore_deadlock = true
+  #     queue = Thread::Queue.new
+  #
+  #     trap(:SIGUSR1){queue.push "Received signal"}
+  #
+  #     # raises fatal error unless ignoring deadlock
+  #     puts queue.pop
+  #
+  # See also ::ignore_deadlock.
+  #
+  def self.ignore_deadlock=: (bool) -> bool
+
   # <!--
   #   rdoc-file=thread.c
   #   - thr[sym]   -> obj or nil
diff --git a/test/stdlib/Thread_test.rb b/test/stdlib/Thread_test.rb
index cb1752ff8..5a814143d 100644
--- a/test/stdlib/Thread_test.rb
+++ b/test/stdlib/Thread_test.rb
@@ -8,6 +8,10 @@ class Sub < Thread
 
   testing "singleton(::Thread)"
 
+  def test_ignore_deadlock
+    assert_send_type "() -> bool", Thread, :ignore_deadlock
+  end
+
   def test_abort_on_exception
     assert_send_type "() -> bool", Thread, :abort_on_exception
   end