From 13ed9438fb47d62663fb1ef367baac1a567b25b3 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Tue, 4 Feb 2020 11:23:12 -0400
Subject: Common: Implement a basic SpinLock class

---
 src/common/spin_lock.cpp | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 src/common/spin_lock.cpp

(limited to 'src/common/spin_lock.cpp')

diff --git a/src/common/spin_lock.cpp b/src/common/spin_lock.cpp
new file mode 100644
index 000000000..8077b78d2
--- /dev/null
+++ b/src/common/spin_lock.cpp
@@ -0,0 +1,46 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/spin_lock.h"
+
+#if _MSC_VER
+#include <intrin.h>
+#if _M_AMD64
+#define __x86_64__ 1
+#endif
+#if _M_ARM64
+#define __aarch64__ 1
+#endif
+#else
+#if __x86_64__
+#include <xmmintrin.h>
+#endif
+#endif
+
+namespace {
+
+void thread_pause() {
+#if __x86_64__
+    _mm_pause();
+#elif __aarch64__ && _MSC_VER
+    __yield();
+#elif __aarch64__
+    asm("yield");
+#endif
+}
+
+} // namespace
+
+namespace Common {
+
+void SpinLock::lock() {
+    while (lck.test_and_set(std::memory_order_acquire))
+        thread_pause();
+}
+
+void SpinLock::unlock() {
+    lck.clear(std::memory_order_release);
+}
+
+} // namespace Common
-- 
cgit v1.2.3