58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
// Filename: mutexSpinlockImpl.h
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// Created by: drose (11Apr06)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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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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#include "atomicAdjust.h"
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////////////////////////////////////////////////////////////////////
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// Class : MutexSpinlockImpl
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// Description : Uses a simple user-space spinlock to implement a
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// mutex. It is usually not a good idea to use this
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// implementation, unless you are building Panda for a
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// specific application on a specific SMP machine, and
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// you are confident that you have at least as many
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// CPU's as you have threads.
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////////////////////////////////////////////////////////////////////
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class EXPCL_DTOOL MutexSpinlockImpl {
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public:
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INLINE MutexSpinlockImpl();
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INLINE ~MutexSpinlockImpl();
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INLINE void lock();
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INLINE bool try_lock();
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INLINE void release();
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private:
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void do_lock();
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TVOLATILE PN_int32 _lock;
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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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