*Backed out changeset 3be01fb200a5
--HG-- branch : trunk
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@@ -1,4 +1,5 @@
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// -*- C++ -*-
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//==========================================================================
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/**
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* @file RW_Mutex.h
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@@ -10,17 +11,25 @@
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* @author Douglas C. Schmidt <[email protected]>
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*/
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//==========================================================================
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#ifndef ACE_RW_MUTEX_H
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#define ACE_RW_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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// ACE platform supports some form of threading.
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#if defined (ACE_HAS_THREADS)
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#include "ace/OS_NS_Thread.h"
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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/**
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* @class ACE_RW_Mutex
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*
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@@ -36,27 +45,34 @@ public:
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ACE_RW_Mutex (int type = USYNC_THREAD,
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const ACE_TCHAR *name = 0,
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void *arg = 0);
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/// Implicitly destroy a readers/writer lock
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~ACE_RW_Mutex (void);
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/**
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* Explicitly destroy a readers/writer lock. Note that only one
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* thread should call this method since it doesn't protect against
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* race conditions.
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*/
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int remove (void);
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/// Acquire a read lock, but block if a writer hold the lock.
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int acquire_read (void);
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/// Acquire a write lock, but block if any readers or a
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/// writer hold the lock.
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int acquire_write (void);
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/**
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* Conditionally acquire a read lock (i.e., won't block). Returns
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* -1 on failure. If we "failed" because someone else already had
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* the lock, @c errno is set to @c EBUSY.
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*/
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int tryacquire_read (void);
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/// Conditionally acquire a write lock (i.e., won't block).
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int tryacquire_write (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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@@ -66,12 +82,14 @@ public:
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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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/**
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* Note, for interface uniformity with other synchronization
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* wrappers we include the <acquire> method. This is implemented as
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* a write-lock to safe...
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*/
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int acquire (void);
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/**
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* Note, for interface uniformity with other synchronization
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* wrappers we include the <tryacquire> method. This is implemented
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@@ -80,33 +98,45 @@ public:
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* set to @c EBUSY.
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*/
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int tryacquire (void);
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/// Unlock a readers/writer lock.
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int release (void);
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/// Return the underlying lock.
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const ACE_rwlock_t &lock (void) const;
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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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protected:
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/// Readers/writer lock.
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ACE_rwlock_t lock_;
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/// Keeps track of whether <remove> has been called yet to avoid
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/// multiple <remove> calls, e.g., explicitly and implicitly in the
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/// destructor. This flag isn't protected by a lock, so make sure
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/// that you don't have multiple threads simultaneously calling
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/// <remove> on the same object, which is a bad idea anyway...
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int removed_;
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private:
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// = Prevent assignment and initialization.
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void operator= (const ACE_RW_Mutex &);
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ACE_RW_Mutex (const ACE_RW_Mutex &);
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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_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_MUTEX_H */
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