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 mutexSpinlockImpl.h
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* @author drose
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* @date 2006-04-11
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*/
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#ifndef MUTEXSPINLOCKIMPL_H
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#define MUTEXSPINLOCKIMPL_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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#ifdef PHAVE_ATOMIC
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#include <atomic>
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#endif
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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_DTOOL_DTOOLBASE MutexSpinlockImpl {
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public:
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constexpr MutexSpinlockImpl() noexcept = default;
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MutexSpinlockImpl(const MutexSpinlockImpl ©) = delete;
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MutexSpinlockImpl &operator = (const MutexSpinlockImpl ©) = delete;
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public:
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INLINE void lock();
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INLINE bool try_lock();
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INLINE void unlock();
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private:
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void do_lock();
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std::atomic_flag _flag = ATOMIC_FLAG_INIT;
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};
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#include "mutexSpinlockImpl.I"
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#endif // MUTEX_SPINLOCK
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#endif
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