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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 "CC_Lock.h"
#include "tao/corba.h"
CC_Lock::CC_Lock(CosConcurrencyControl::lock_mode mode)
: mode_ (mode), lock_held_ (0)
{
}
CC_Lock::~CC_Lock()
{
}
void CC_Lock::lock(CORBA::Environment &_env)
{
lock_held_++;
int success = semaphore_.acquire();
if(success==-1) {
TAO_THROW(CORBA::INTERNAL(CORBA::COMPLETED_NO));
}
}
CORBA::Boolean CC_Lock::try_lock(CORBA::Environment &_env)
{
lock_held_++;
int success = semaphore_.tryacquire();
if(success==-1) {
if(errno==EBUSY) {
lock_held_--;
return CORBA::B_FALSE;
}
else
TAO_THROW_RETURN(CORBA::INTERNAL(CORBA::COMPLETED_NO), CORBA::B_FALSE);
}
else {
this->lock(_env);
}
}
void CC_Lock::unlock(CORBA::Environment &_env)
{
if(lock_held_==0)
TAO_THROW(CosConcurrencyControl::LockNotHeld);
int success = semaphore_.release();
if(success==-1) {
TAO_THROW(CORBA::INTERNAL(CORBA::COMPLETED_NO));
}
lock_held_--;
}
void CC_Lock::change_mode(CosConcurrencyControl::lock_mode new_mode,
CORBA::Environment &_env)
{
// @@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
if(lock_held_==0)
TAO_THROW(CosConcurrencyControl::LockNotHeld);
this->mode_ = new_mode;
}
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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