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