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74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
// -*- C++ -*-
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//==========================================================================
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/**
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* @file RW_Thread_Mutex.h
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*
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* $Id: RW_Thread_Mutex.h 80826 2008-03-04 14:51:23Z wotte $
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*
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* Moved from Synch.h.
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*
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* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
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*/
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//==========================================================================
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#ifndef ACE_RW_THREAD_MUTEX_H
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#define ACE_RW_THREAD_MUTEX_H
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#include /**/ "ace/pre.h"
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#include /**/ "ace/ACE_export.h"
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#if !defined (ACE_LACKS_PRAGMA_ONCE)
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# pragma once
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#endif /* ACE_LACKS_PRAGMA_ONCE */
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#if !defined (ACE_HAS_THREADS)
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# include "ace/Null_Mutex.h"
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#else /* ACE_HAS_THREADS */
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// ACE platform supports some form of threading.
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#include "ace/RW_Mutex.h"
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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/**
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* @class ACE_RW_Thread_Mutex
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*
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* @brief Wrapper for readers/writer locks that exist within a process.
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*/
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class ACE_Export ACE_RW_Thread_Mutex : public ACE_RW_Mutex
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{
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public:
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ACE_RW_Thread_Mutex (const ACE_TCHAR *name = 0,
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void *arg = 0);
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/// Default dtor.
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~ACE_RW_Thread_Mutex (void);
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/**
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* Conditionally upgrade a read lock to a write lock. This only
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* works if there are no other readers present, in which case the
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* method returns 0. Otherwise, the method returns -1 and sets
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* @c errno to @c EBUSY. Note that the caller of this method *must*
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* already possess this lock as a read lock (but this condition is
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* not checked by the current implementation).
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*/
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int tryacquire_write_upgrade (void);
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/// Dump the state of an object.
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void dump (void) const;
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/// Declare the dynamic allocation hooks.
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ACE_ALLOC_HOOK_DECLARE;
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};
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ACE_END_VERSIONED_NAMESPACE_DECL
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#if defined (__ACE_INLINE__)
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#include "ace/RW_Thread_Mutex.inl"
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#endif /* __ACE_INLINE__ */
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#endif /* !ACE_HAS_THREADS */
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#include /**/ "ace/post.h"
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#endif /* ACE_RW_THREAD_MUTEX_H */
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