From 920fd4cf0dcb69d1075154572953e780725d1908 Mon Sep 17 00:00:00 2001
From: wheremyfoodat <gponiris2004@gmail.com>
Date: Thu, 20 Apr 2023 02:48:57 +0300
Subject: [PATCH] [Kernel::WaitSync1] Instant timeout if ns == 0

---
 include/kernel/kernel_types.hpp | 3 +++
 src/core/kernel/events.cpp      | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/include/kernel/kernel_types.hpp b/include/kernel/kernel_types.hpp
index 27893922..8db4903a 100644
--- a/include/kernel/kernel_types.hpp
+++ b/include/kernel/kernel_types.hpp
@@ -23,6 +23,9 @@ namespace SVCResult {
 
         BadThreadPriority = 0xE0E01BFD,
         PortNameTooLong = 0xE0E0181E,
+
+        // Returned when a thread stops waiting due to timing out
+        Timeout = 0x9401BFE,
 	};
 }
 
diff --git a/src/core/kernel/events.cpp b/src/core/kernel/events.cpp
index cab777f7..dad80a47 100644
--- a/src/core/kernel/events.cpp
+++ b/src/core/kernel/events.cpp
@@ -103,6 +103,12 @@ void Kernel::waitSynchronization1() {
 	if (!shouldWaitOnObject(object)) {
 		regs[0] = SVCResult::Success;
 	} else {
+		// Timeout is 0, don't bother waiting, instantly timeout
+		if (ns == 0) {
+			regs[0] = SVCResult::Timeout;
+			return;
+		}
+
 		regs[0] = SVCResult::Success;
 
 		auto& t = threads[currentThreadIndex];