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// -*- C++ -*-
//=============================================================================
/**
* @file Task_T.h
*
* @author Douglas C. Schmidt <d.schmidt@vanderbilt.edu>
*/
//=============================================================================
#ifndef ACE_TASK_T_H
#define ACE_TASK_T_H
#include /**/ "ace/pre.h"
#include "ace/Message_Queue.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Synch_Traits.h"
#include "ace/Task.h"
#include "ace/IO_Cntl_Msg.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
// Forward decls...
template <ACE_SYNCH_DECL, class TIME_POLICY> class ACE_Module;
/**
* @class ACE_Task
*
* @brief Primary interface for application message processing, as well
* as input and output message queueing.
*
* This class serves as the basis for passive and active objects
* in ACE.
*/
template <ACE_SYNCH_DECL, class TIME_POLICY = ACE_System_Time_Policy>
class ACE_Task : public ACE_Task_Base
{
public:
friend class ACE_Module<ACE_SYNCH_USE, TIME_POLICY>;
friend class ACE_Module_Type;
// = Initialization/termination methods.
/**
* Initialize a Task, supplying a thread manager and a message
* queue. If the user doesn't supply a ACE_Message_Queue pointer
* then we'll allocate one dynamically. Otherwise, we'll use the
* one passed as a parameter.
*/
ACE_Task (ACE_Thread_Manager *thr_mgr = 0,
ACE_Message_Queue<ACE_SYNCH_USE, TIME_POLICY> *mq = 0);
/// Destructor.
virtual ~ACE_Task ();
/// Gets the message queue associated with this task.
ACE_Message_Queue<ACE_SYNCH_USE, TIME_POLICY> *msg_queue ();
/// Sets the message queue associated with this task.
void msg_queue (ACE_Message_Queue<ACE_SYNCH_USE, TIME_POLICY> *);
/// Get the current time of day according to the queue's TIME_POLICY.
/// Allows users to initialize timeout values using correct time policy.
ACE_Time_Value_T<TIME_POLICY> gettimeofday () const;
/// Allows applications to control how the timer queue gets the time
/// of day.
void set_time_policy (TIME_POLICY const & time_policy);
public: // Should be protected:
// = Message queue manipulation methods.
// = Enqueue and dequeue methods.
// For the following five method if @a timeout == 0, the caller will
// block until action is possible, else will wait until the
// <{absolute}> time specified in *@a timeout elapses). These calls
// will return, however, when queue is closed, deactivated, when a
// signal occurs, or if the time specified in timeout elapses, (in
// which case errno = EWOULDBLOCK).
/// Insert message into the message queue. Note that @a timeout uses
/// <{absolute}> time rather than <{relative}> time.
int putq (ACE_Message_Block *, ACE_Time_Value *timeout = 0);
/**
* Extract the first message from the queue (blocking). Note that
* @a timeout uses <{absolute}> time rather than <{relative}> time.
* Returns number of items in queue if the call succeeds or -1 otherwise.
*/
int getq (ACE_Message_Block *&mb, ACE_Time_Value *timeout = 0);
/// Return a message to the queue. Note that @a timeout uses
/// <{absolute}> time rather than <{relative}> time.
int ungetq (ACE_Message_Block *, ACE_Time_Value *timeout = 0);
/**
* Turn the message around, sending it in the opposite direction in
* the stream. To do this, the message is put onto the task next in
* the stream after this task's sibling.
*
* @param mb Pointer to the block that is used in the reply.
* @param tv The absolute time at which the put operation used to
* send the message block to the next module in the stream
* will time out. If 0, this call blocks until it can be
* completed.
*/
int reply (ACE_Message_Block *mb, ACE_Time_Value *tv = 0);
/**
* Transfer message to the adjacent ACE_Task in a ACE_Stream. Note
* that @a timeout uses <{absolute}> time rather than <{relative}>
* time.
*/
int put_next (ACE_Message_Block *msg, ACE_Time_Value *timeout = 0);
// = ACE_Task utility routines to identify names et al.
/// Return the name of the enclosing Module if there's one associated
/// with the Task, else returns 0.
const ACE_TCHAR *name () const;
// = Pointers to next ACE_Task_Base (if ACE is part of an ACE_Stream).
/// Get next Task pointer.
virtual ACE_Task<ACE_SYNCH_USE, TIME_POLICY> *next ();
/// Set next Task pointer.
void next (ACE_Task<ACE_SYNCH_USE, TIME_POLICY> *);
/// Return the Task's sibling if there's one associated with the
/// Task's Module, else returns 0.
ACE_Task<ACE_SYNCH_USE, TIME_POLICY> *sibling ();
/// Return the Task's Module if there is one, else returns 0.
ACE_Module<ACE_SYNCH_USE, TIME_POLICY> *module () const;
/**
* Flush the task's queue, i.e., free all of the enqueued
* message blocks and unblocks any threads waiting on the queue.
* Note that if this conflicts with the C++ iostream <flush>
* function, just rewrite the iostream function as ::<flush>.
*/
virtual int flush (u_long flag = ACE_Task_Flags::ACE_FLUSHALL);
// = Special routines corresponding to certain message types.
/// Manipulate watermarks.
void water_marks (ACE_IO_Cntl_Msg::ACE_IO_Cntl_Cmds, size_t);
/// Queue of messages on the ACE_Task..
ACE_Message_Queue<ACE_SYNCH_USE, TIME_POLICY> *msg_queue_;
/// true if should delete Message_Queue, false otherwise.
bool delete_msg_queue_;
/// Back-pointer to the enclosing module.
ACE_Module<ACE_SYNCH_USE, TIME_POLICY> *mod_;
/// Pointer to adjacent ACE_Task.
ACE_Task<ACE_SYNCH_USE, TIME_POLICY> *next_;
/// Dump the state of an object.
void dump () const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
private:
void operator= (const ACE_Task<ACE_SYNCH_USE, TIME_POLICY> &) = delete;
ACE_Task (const ACE_Task<ACE_SYNCH_USE, TIME_POLICY> &) = delete;
};
#if defined ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION_EXPORT
template class ACE_Export ACE_Task<ACE_MT_SYNCH>;
template class ACE_Export ACE_Task<ACE_NULL_SYNCH>;
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION_EXPORT */
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "ace/Task_T.inl"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Task_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Task_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#include /**/ "ace/post.h"
#endif /* ACE_TASK_T_H */
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