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// -*- C++ -*-
//==========================================================================
/**
* @file RW_Thread_Mutex.h
*
* $Id$
*
* Moved from Synch.h.
*
* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
*/
//==========================================================================
#ifndef ACE_RW_THREAD_MUTEX_H
#define ACE_RW_THREAD_MUTEX_H
#include /**/ "ace/pre.h"
#include "ace/ACE_export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#if !defined (ACE_HAS_THREADS)
# include "ace/Null_Mutex.h"
#else /* ACE_HAS_THREADS */
// ACE platform supports some form of threading.
#include "ace/RW_Mutex.h"
/**
* @class ACE_RW_Thread_Mutex
*
* @brief Wrapper for readers/writer locks that exist within a process.
*/
class ACE_Export ACE_RW_Thread_Mutex : public ACE_RW_Mutex
{
public:
ACE_RW_Thread_Mutex (const ACE_TCHAR *name = 0,
void *arg = 0);
/// Default dtor.
~ACE_RW_Thread_Mutex (void);
/**
* Conditionally upgrade a read lock to a write lock. This only
* works if there are no other readers present, in which case the
* method returns 0. Otherwise, the method returns -1 and sets
* <errno> to <EBUSY>. Note that the caller of this method *must*
* already possess this lock as a read lock (but this condition is
* not checked by the current implementation).
*/
int tryacquire_write_upgrade (void);
/// Dump the state of an object.
void dump (void) const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
};
#if defined (__ACE_INLINE__)
#include "ace/RW_Thread_Mutex.inl"
#endif /* __ACE_INLINE__ */
#endif /* !ACE_HAS_THREADS */
#include /**/ "ace/post.h"
#endif /* ACE_RW_THREAD_MUTEX_H */
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