conditionVarWin32Impl.h

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/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file conditionVarWin32Impl.h
 * @author drose
 * @date 2006-02-07
 */

#ifndef CONDITIONVARWIN32IMPL_H
#define CONDITIONVARWIN32IMPL_H

#include "pandabase.h"
#include "selectThreadImpl.h"

#if defined(WIN32_VC)

#include "mutexWin32Impl.h"
#include "pnotify.h"

class MutexWin32Impl;

/**
 * Uses Windows native calls to implement a conditionVar.
 *
 * The Windows native synchronization primitives don't actually implement a
 * full POSIX-style condition variable, but the Event primitive does a fair
 * job if we disallow notify_all() (POSIX broadcast).  See
 * ConditionVarFullWin32Impl for a full implementation that includes
 * notify_all().  This class is much simpler than that full implementation, so
 * we can avoid the overhead required to support broadcast.
 */
class EXPCL_PANDA_PIPELINE ConditionVarWin32Impl {
public:
  INLINE ConditionVarWin32Impl(MutexWin32Impl &mutex);
  INLINE ~ConditionVarWin32Impl();

  INLINE void wait();
  INLINE void wait(double timeout);
  INLINE void notify();

private:
  CRITICAL_SECTION *_external_mutex;
  HANDLE _event_signal;
};

#include "conditionVarWin32Impl.I"

#endif  // WIN32_VC

#endif