initial commit, 4.5 stable

thirdparty/jolt_physics/Jolt/Core/Atomics.h

@@ -0,0 +1,44 @@
+// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
+// SPDX-FileCopyrightText: 2021 Jorrit Rouwe
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+JPH_SUPPRESS_WARNINGS_STD_BEGIN
+#include <atomic>
+JPH_SUPPRESS_WARNINGS_STD_END
+
+JPH_NAMESPACE_BEGIN
+
+// Things we're using from STL
+using std::atomic;
+using std::memory_order;
+using std::memory_order_relaxed;
+using std::memory_order_acquire;
+using std::memory_order_release;
+using std::memory_order_acq_rel;
+using std::memory_order_seq_cst;
+
+/// Atomically compute the min(ioAtomic, inValue) and store it in ioAtomic, returns true if value was updated
+template <class T>
+bool AtomicMin(atomic<T> &ioAtomic, const T inValue, const memory_order inMemoryOrder = memory_order_seq_cst)
+{
+	T cur_value = ioAtomic.load(memory_order_relaxed);
+	while (cur_value > inValue)
+		if (ioAtomic.compare_exchange_weak(cur_value, inValue, inMemoryOrder))
+			return true;
+	return false;
+}
+
+/// Atomically compute the max(ioAtomic, inValue) and store it in ioAtomic, returns true if value was updated
+template <class T>
+bool AtomicMax(atomic<T> &ioAtomic, const T inValue, const memory_order inMemoryOrder = memory_order_seq_cst)
+{
+	T cur_value = ioAtomic.load(memory_order_relaxed);
+	while (cur_value < inValue)
+		if (ioAtomic.compare_exchange_weak(cur_value, inValue, inMemoryOrder))
+			return true;
+	return false;
+}
+
+JPH_NAMESPACE_END