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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// TAO/orbsvcs/Concurrency_Service
//
// = FILENAME
// CC_Lock.h
//
// = DESCRIPTION
// This class implements a lock used by the lock set from the
// concurrency control service
//
// = AUTHORS
// Torben Worm <tworm@cs.wustl.edu>
//
// ============================================================================
#if !defined (_CC_LOCK_H)
#define _CC_LOCK_H
#include "ace/SV_Semaphore_Simple.h"
#include "orbsvcs/CosConcurrencyControlC.h"
class TAO_ORBSVCS_Export CC_Lock {
// = TITLE
// CC_Lock
//
// = DESCRIPTION
// This class implements the lock concept from the concurrency
// control service. The lock holds its mode - this might later be
// changed to subclasses depending on the differences of the locks.
// At present the is only a lock-pr-thread/client-type which is
// essentially a write lock since it is not allowed to have more
// than one lock pr. servant in this implementation.
public:
CC_Lock(CosConcurrencyControl::lock_mode mode);
// Creates the lock with the desired mode
~CC_Lock();
// Deletes the lock
void lock(void);
// Acquires this lock. Blocks until lock is obtained
CORBA::Boolean try_lock();
// Tries to acquire this lock. If it is not possible to acquire the
// lock, false is returned
void unlock(void);
// Releases this lock
void change_mode(CosConcurrencyControl::lock_mode new_mode);
// Changes the mode of this lock
CORBA::Boolean Compatible(const CC_Lock &other);
// returns true if this lock is compatible with the other lock
CORBA::Boolean Compatible(CosConcurrencyControl::lock_mode mode);
// returns true is this lock is compatible with the referenced mode
CosConcurrencyControl::lock_mode GetMode(void);
// Returns the mode of the lock
protected:
CosConcurrencyControl::lock_mode mode_;
// Holds the lock's mode
private:
ACE_SV_Semaphore_Simple semaphore_;
// holds the semaphore for this lock
static CORBA::Boolean compatible_[5][5];
// defines the compatibility of the locks. 5 = number of lock modes
};
//#if defined (__ACE_INLINE__)
//#include "CC_Lock.i"
//#endif // defined INLINE
#endif /* !defined (_CC_LOCK_H) */
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