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123 lines
3.4 KiB
C++
123 lines
3.4 KiB
C++
// -*- C++ -*-
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//==========================================================================
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/**
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* @file Lock_Adapter_T.h
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*
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* $Id: Lock_Adapter_T.h 93359 2011-02-11 11:33:12Z mcorino $
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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_LOCK_ADAPTER_T_H
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#define ACE_LOCK_ADAPTER_T_H
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#include /**/ "ace/pre.h"
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#include "ace/Lock.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_BEGIN_VERSIONED_NAMESPACE_DECL
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/**
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* @class ACE_Lock_Adapter
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*
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* @brief This is an adapter that allows applications to transparently
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* combine the ACE_Lock abstract base class (which contains
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* pure virtual methods) with any of the other concrete ACE
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* synchronization classes (e.g., ACE_Mutex, ACE_Semaphore,
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* ACE_RW_Mutex, etc.).
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*
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* This class uses a form of the Adapter pattern.
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*/
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template <class ACE_LOCKING_MECHANISM>
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class ACE_Lock_Adapter : public ACE_Lock
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{
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public:
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typedef ACE_LOCKING_MECHANISM ACE_LOCK;
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// = Initialization/Finalization methods.
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/// Constructor. All locking requests will be forwarded to @a lock.
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ACE_Lock_Adapter (ACE_LOCKING_MECHANISM &lock);
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/// Constructor. Since no lock is provided by the user, one will be
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/// created internally.
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ACE_Lock_Adapter (void);
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/// Destructor. If @c lock_ was not passed in by the user, it will be
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/// deleted.
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virtual ~ACE_Lock_Adapter (void);
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// = Lock accessors.
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/// Block the thread until the lock is acquired.
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virtual int acquire (void);
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/// Conditionally acquire the lock (i.e., won't block).
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virtual int tryacquire (void);
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/// Release the lock.
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virtual int release (void);
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/**
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* Block until the thread acquires a read lock. If the locking
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* mechanism doesn't support read locks then this just calls
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* acquire().
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*/
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virtual int acquire_read (void);
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/**
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* Block until the thread acquires a write lock. If the locking
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* mechanism doesn't support read locks then this just calls
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* acquire().
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*/
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virtual int acquire_write (void);
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/// Conditionally acquire a read lock. If the locking mechanism
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/// doesn't support read locks then this just calls acquire().
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virtual int tryacquire_read (void);
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/// Conditionally acquire a write lock. If the locking mechanism
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/// doesn't support read locks then this just calls acquire().
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virtual int tryacquire_write (void);
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/**
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* Conditionally try to upgrade a lock held for read to a write lock.
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* If the locking mechanism doesn't support read locks then this just
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* calls acquire(). Returns 0 on success, -1 on failure.
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*/
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virtual int tryacquire_write_upgrade (void);
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/// Explicitly destroy the lock.
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virtual int remove (void);
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private:
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/// The concrete locking mechanism that all the methods delegate to.
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ACE_LOCKING_MECHANISM *lock_;
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/// This flag keep track of whether we are responsible for deleting
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/// the lock
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bool delete_lock_;
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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/Lock_Adapter_T.inl"
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#endif /* __ACE_INLINE__ */
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#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
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#include "ace/Lock_Adapter_T.cpp"
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#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
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#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
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#pragma implementation ("Lock_Adapter_T.cpp")
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#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
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#include /**/ "ace/post.h"
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#endif /* ACE_LOCK_ADAPTER_T_H */
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