SbThreadSpinlock.h

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/*=======================================================================
 *** THE CONTENT OF THIS WORK IS PROPRIETARY TO FEI S.A.S, (FEI S.A.S.),            ***
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 ***  CLAUSE  AT FAR 52.227-19  OR SUBPARAGRAPH  (C)(1)(II)  OF  THE RIGHTS IN      ***
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 ***                        BORDEAUX, FRANCE                                        ***
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**=======================================================================*/
/*=======================================================================
** Author      : David Beilloin (Feb 2008)
**=======================================================================*/
 
#ifndef _SB_THREAD_SPINLOCK_H_
#define _SB_THREAD_SPINLOCK_H_
 
#include <Inventor/SbBase.h>
#include <Inventor/threads/SbThread.h>
#include <Inventor/threads/SbThreadMutex.h>
 
class  SbThreadSpinlock
{
 public:
  SbThreadSpinlock() ;
  ~SbThreadSpinlock() ;
 
  void lock() ;
 
  void unlock() ;
 
private:
#if defined(_WIN32)
  LONG volatile m_spinLock;
  SbThreadId_t m_curThread;
  int m_enterCount;
#else
  SbThreadMutex m_spinLock;
#endif
};
 
class  SbThreadAutoSpinlock {
 public:
  SbThreadAutoSpinlock(SbThreadSpinlock *spinlock)
  {
    m_spinlock = spinlock;
    if ( m_spinlock )
      m_spinlock->lock();
  }
 
  SbThreadAutoSpinlock( SbThreadSpinlock &spinlock )
  {
    m_spinlock = &spinlock;
    m_spinlock->lock();
  }
 
#ifndef HIDDEN_FROM_DOC
  ~SbThreadAutoSpinlock()
  {
    if ( m_spinlock )
      m_spinlock->unlock();
  }
#endif // HIDDEN_FROM_DOC
 
 private:
  // Default constructor not accessible
  SbThreadAutoSpinlock()
  :m_spinlock(NULL)
  {}
 
  // Copy constructor not accessible
  SbThreadAutoSpinlock(const SbThreadAutoSpinlock&)
  :m_spinlock(NULL)
  {}
 
  SbThreadSpinlock *m_spinlock;
};
 
#endif // _SB_THREAD_SPINLOCK_H_