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/* -*- C++ -*- */
// $Id$
//
// ============================================================================
//
// = LIBRARY
// ORBSVCS Real-time Event Channel
//
// = FILENAME
// EC_Priority_Dispatching
//
// = AUTHOR
// Carlos O'Ryan (coryan@cs.wustl.edu)
//
// = CREDITS
// Based on previous work by Tim Harrison (harrison@cs.wustl.edu)
// and other members of the DOC group.
// More details can be found in:
// http://www.cs.wustl.edu/~schmidt/oopsla.ps.gz
// http://www.cs.wustl.edu/~schmidt/JSAC-98.ps.gz
//
//
// ============================================================================
#ifndef TAO_EC_PRIORITY_DISPATCHING_H
#define TAO_EC_PRIORITY_DISPATCHING_H
#include "orbsvcs/RtecSchedulerC.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "EC_Dispatching.h"
class TAO_EC_Dispatching_Task;
class TAO_EC_Event_Channel;
class TAO_ORBSVCS_Export TAO_EC_Priority_Dispatching : public TAO_EC_Dispatching
{
// = TITLE
// Dispatching strategy that minimizes priority inversion.
//
// = DESCRIPTION
// This strategy uses multiple queues, each serviced by a thread
// at different priority. This minimizes priority inversion
// because the consumers at higher priority are serviced before
// consumers at lower priority.
// It is more flexible than using the supplier thread to dispatch
// because it allows high-priority suppliers to push events to
// low-priority consumers (and vice-versa).
// It also isolates the supplier threads from the time spent on
// upcalls to the consumer objects, making the system easier to
// analyze and schedule.
//
public:
TAO_EC_Priority_Dispatching (TAO_EC_Event_Channel* ec);
// The scheduler is used to find the range of priorities and similar
// info.
// = The EC_Dispatching methods.
virtual void activate (void);
virtual void shutdown (void);
virtual void push (TAO_EC_ProxyPushSupplier* proxy,
const RtecEventComm::EventSet& event,
TAO_EC_QOS_Info& qos_info,
CORBA::Environment& env);
virtual void push_nocopy (TAO_EC_ProxyPushSupplier* proxy,
RtecEventComm::EventSet& event,
TAO_EC_QOS_Info& qos_info,
CORBA::Environment& env);
private:
ACE_Thread_Manager thread_manager_;
// Use our own thread manager.
int ntasks_;
// The number of active tasks
TAO_EC_Dispatching_Task** tasks_;
// The tasks..
RtecScheduler::Scheduler_var scheduler_;
// The scheduler
};
#if defined (__ACE_INLINE__)
#include "EC_Priority_Dispatching.i"
#endif /* __ACE_INLINE__ */
#endif /* TAO_EC_PRIORITY_DISPATCHING_H */
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