55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
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/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file reMutexSpinlockImpl.h
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* @author rdb
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* @date 2018-09-03
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*/
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#ifndef REMUTEXSPINLOCKIMPL_H
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#define REMUTEXSPINLOCKIMPL_H
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#include "dtoolbase.h"
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#include "selectThreadImpl.h"
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#ifdef MUTEX_SPINLOCK
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#include "atomicAdjust.h"
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class Thread;
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/**
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* Uses a simple user-space spinlock to implement a mutex. It is usually not
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* a good idea to use this implementation, unless you are building Panda for a
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* specific application on a specific SMP machine, and you are confident that
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* you have at least as many CPU's as you have threads.
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*/
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class EXPCL_PANDA_PIPELINE ReMutexSpinlockImpl {
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public:
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constexpr ReMutexSpinlockImpl() noexcept = default;
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ReMutexSpinlockImpl(const ReMutexSpinlockImpl ©) = delete;
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ReMutexSpinlockImpl &operator = (const ReMutexSpinlockImpl ©) = delete;
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public:
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void lock();
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bool try_lock();
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INLINE void unlock();
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private:
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AtomicAdjust::Pointer _locking_thread = nullptr;
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unsigned int _counter = 0;
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};
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#include "reMutexSpinlockImpl.I"
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#endif // MUTEX_SPINLOCK
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#endif
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