From bbd502f67adb17b00b33f1b7158cfff2b2fa8a3e Mon Sep 17 00:00:00 2001
From: Morph <39850852+Morph1984@users.noreply.github.com>
Date: Sat, 22 Apr 2023 23:58:27 -0400
Subject: [PATCH] nvnflinger: Acquire lock prior to signaling the vsync
 variable

---
 src/core/hle/service/nvnflinger/nvnflinger.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/core/hle/service/nvnflinger/nvnflinger.cpp b/src/core/hle/service/nvnflinger/nvnflinger.cpp
index 4988e6e17..aa3356611 100644
--- a/src/core/hle/service/nvnflinger/nvnflinger.cpp
+++ b/src/core/hle/service/nvnflinger/nvnflinger.cpp
@@ -70,7 +70,8 @@ Nvnflinger::Nvnflinger(Core::System& system_, HosBinderDriverServer& hos_binder_
         [this](std::uintptr_t, s64 time,
                std::chrono::nanoseconds ns_late) -> std::optional<std::chrono::nanoseconds> {
             vsync_signal.store(true);
-            vsync_signal.notify_all();
+            { const auto lock_guard = Lock(); }
+            vsync_signal.notify_one();
             return std::chrono::nanoseconds(GetNextTicks());
         });