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100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
// -*- C++ -*-
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//=============================================================================
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/**
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* @file Priority_Reactor.h
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*
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* $Id: Priority_Reactor.h 82723 2008-09-16 09:35:44Z johnnyw $
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*
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* @author Carlos O'Ryan <coryan@uci.edu>
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*/
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//=============================================================================
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#ifndef ACE_PRIORITY_REACTOR_H
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#define ACE_PRIORITY_REACTOR_H
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#include /**/ "ace/pre.h"
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#include /**/ "ace/ACE_export.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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#include "ace/Select_Reactor.h"
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#include "ace/Unbounded_Queue.h"
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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/**
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* @class ACE_Priority_Reactor
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*
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* @brief Implements priority based dispatching.
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*
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* This class refines the dispatching mechanism for the
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* Select_Reactor by taking advantage of the priority method on
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* ACE_Event_Handler.
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*/
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class ACE_Export ACE_Priority_Reactor : public ACE_Select_Reactor
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{
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public:
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// = Initialization and termination methods.
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/// Initialize ACE_Priority_Reactor with the default size.
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ACE_Priority_Reactor (ACE_Sig_Handler * = 0,
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ACE_Timer_Queue * = 0);
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/// Initialize ACE_Priority_Reactor with size @a size.
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ACE_Priority_Reactor (size_t size,
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bool restart = false,
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ACE_Sig_Handler * = 0,
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ACE_Timer_Queue * = 0);
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/// Close down the select_reactor and release all of its resources.
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virtual ~ACE_Priority_Reactor (void);
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/// Dump the state of an object.
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void dump (void) const;
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/// Declare the dynamic allocation hooks.
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ACE_ALLOC_HOOK_DECLARE;
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protected:
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// = Dispatching methods.
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/// We simply override this function to implement the priority
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/// dispatching.
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virtual int dispatch_io_set (int number_of_active_handles,
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int &number_dispatched,
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int mask,
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ACE_Handle_Set &dispatch_mask,
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ACE_Handle_Set &ready_mask,
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ACE_EH_PTMF callback);
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private:
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/// A small helper to initialize the bucket.
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void init_bucket (void);
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/// Build the bucket from the given dispatch_mask. Return -1 on
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/// failure, 0 otherwise.
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int build_bucket (ACE_Handle_Set& dispatch_mask,
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int &min_priority,
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int &max_priority);
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/// There is a queue per-priority, which simply holds the
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/// Event_Handlers until we know who goes first.
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typedef ACE_Unbounded_Queue<ACE_Event_Tuple> QUEUE;
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QUEUE** bucket_;
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/// The queues themselves use this allocator to minimize dynamic
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/// memory usage.
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ACE_Allocator* tuple_allocator_;
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/// Deny access since member-wise won't work...
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ACE_Priority_Reactor (const ACE_Priority_Reactor &);
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ACE_Priority_Reactor &operator = (const ACE_Priority_Reactor &);
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};
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ACE_END_VERSIONED_NAMESPACE_DECL
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#include /**/ "ace/post.h"
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#endif /* ACE_PRIORITY_REACTOR_H */
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