From 9703501b54b4400b8b315c149f5ae71264a81ea3 Mon Sep 17 00:00:00 2001
From: Gliniak <Gliniak93@gmail.com>
Date: Wed, 21 May 2025 22:47:10 +0200
Subject: [PATCH] [XThread] Changed behaviour for threads requesting Yield with
 non-alertable state

---
 src/xenia/kernel/xthread.cc | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/src/xenia/kernel/xthread.cc b/src/xenia/kernel/xthread.cc
index 559afd6bd..05b5613dc 100644
--- a/src/xenia/kernel/xthread.cc
+++ b/src/xenia/kernel/xthread.cc
@@ -763,13 +763,8 @@ X_STATUS XThread::Delay(uint32_t processor_mode, uint32_t alertable,
     timeout_ms = uint32_t(-timeout_ticks / 10000);  // Ticks -> MS
   } else {
     timeout_ms = 0;
-    // TODO(Gliniak): Check how it works, but it seems outright wrong.
-    // However some titles like to change priority then go to sleep with timeout
-    // 0.
-    if (priority_ <= xe::threading::ThreadPriority::kBelowNormal) {
-      timeout_ms = 1;
-    }
   }
+
   timeout_ms = Clock::ScaleGuestDurationMillis(timeout_ms);
   if (alertable) {
     auto result =
@@ -782,9 +777,18 @@ X_STATUS XThread::Delay(uint32_t processor_mode, uint32_t alertable,
         return X_STATUS_USER_APC;
     }
   } else {
-    xe::threading::Sleep(std::chrono::milliseconds(timeout_ms));
-    return X_STATUS_SUCCESS;
+    if (timeout_ms == 0) {
+      if (priority_ <= xe::threading::ThreadPriority::kBelowNormal) {
+        xe::threading::NanoSleep(100);
+      } else {
+        xe::threading::MaybeYield();
+      }
+    } else {
+      xe::threading::Sleep(std::chrono::milliseconds(timeout_ms));
+    }
   }
+
+  return X_STATUS_SUCCESS;
 }
 
 struct ThreadSavedState {