73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
// Filename: conditionVarFullWin32Impl.h
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// Created by: drose (28Aug06)
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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 CONDITIONVARFULLWIN32IMPL_H
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#define CONDITIONVARFULLWIN32IMPL_H
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#include "pandabase.h"
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#include "selectThreadImpl.h"
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#ifdef WIN32_VC
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#include "mutexWin32Impl.h"
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#include "pnotify.h"
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#include "atomicAdjust.h"
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class MutexWin32Impl;
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////////////////////////////////////////////////////////////////////
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// Class : ConditionVarFullWin32Impl
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// Description : Uses Windows native calls to implement a
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// conditionVarFull.
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//
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// We follow the "SetEvent" implementation suggested by
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// http://www.cs.wustl.edu/~schmidt/win32-cv-1.html .
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// This allows us to implement both signal() and
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// signal_all(), but it has more overhead than the
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// simpler implementation of ConditionVarWin32Impl.
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//
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// As described by the above reference, this
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// implementation suffers from a few weaknesses; in
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// particular, it does not necessarily wake up all
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// threads fairly; and it may sometimes incorrectly wake
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// up a thread that was not waiting at the time signal()
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// was called. But we figure it's good enough for our
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// purposes.
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////////////////////////////////////////////////////////////////////
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class EXPCL_PANDA ConditionVarFullWin32Impl {
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public:
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INLINE ConditionVarFullWin32Impl(MutexWin32Impl &mutex);
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INLINE ~ConditionVarFullWin32Impl();
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INLINE void wait();
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INLINE void signal();
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INLINE void signal_all();
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private:
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CRITICAL_SECTION *_external_mutex;
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HANDLE _event_signal;
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HANDLE _event_broadcast;
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TVOLATILE PN_int32 _waiters_count;
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};
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#include "conditionVarFullWin32Impl.I"
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#endif // WIN32_VC
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#endif
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