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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// TAO/orbsvcs/Concurrency_Service
//
// = FILENAME
// CC_Lock.cpp
//
// = DESCRIPTION
// This class implements a lock used by the lock set from the
// concurrency control service
//
// = AUTHORS
// Torben Worm <tworm@cs.wustl.edu>
//
// ============================================================================
// #include "tao/corba.h"
#include "CC_Lock.h"
CC_Lock::CC_Lock(CosConcurrencyControl::lock_mode mode) : mode_ (mode)
{
semaphore_.open("test"); // @@ The semaphore must have a unique name??
}
CC_Lock::~CC_Lock()
{
semaphore_.close();
}
void CC_Lock::lock(void)
{
semaphore_.acquire();
}
CORBA::Boolean CC_Lock::try_lock()
{
semaphore_.tryacquire(); //@@ What does tryacquire return??
return CORBA::B_TRUE;
}
void CC_Lock::unlock(void)
{
semaphore_.release();
}
void CC_Lock::change_mode(CosConcurrencyControl::lock_mode new_mode)
{
// @@TAO Hmmm, we cannot really do anything at present since there is
// only one lock per lock set and that lock is essentially a write lock
}
CORBA::Boolean CC_Lock::Compatible(const CC_Lock &other)
{
return this->Compatible(other.mode_);
}
CORBA::Boolean CC_Lock::Compatible(CosConcurrencyControl::lock_mode mode)
{
return compatible_[this->mode_][mode];
}
CosConcurrencyControl::lock_mode CC_Lock::GetMode(void)
{
return mode_;
}
// The check of compatibility is a hard coded table statically allocated
// This table must be changed if the number of lock modes or their
// compatibility are changed. 5 = number of lock modes
CORBA::Boolean CC_Lock::compatible_[5][5] ={
{CORBA::B_TRUE, CORBA::B_TRUE, CORBA::B_TRUE, CORBA::B_TRUE, CORBA::B_FALSE},
{CORBA::B_TRUE, CORBA::B_TRUE, CORBA::B_TRUE, CORBA::B_FALSE, CORBA::B_FALSE},
{CORBA::B_TRUE, CORBA::B_TRUE, CORBA::B_FALSE, CORBA::B_FALSE, CORBA::B_FALSE},
{CORBA::B_TRUE, CORBA::B_FALSE, CORBA::B_FALSE, CORBA::B_FALSE, CORBA::B_TRUE},
{CORBA::B_FALSE, CORBA::B_FALSE, CORBA::B_FALSE, CORBA::B_FALSE, CORBA::B_FALSE}};
//#if defined (__ACE_INLINE__)
//#include "CC_Lock.i"
//#endif // defined INLINE
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