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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Task_T.h
//
// = AUTHOR
// Douglas C. Schmidt <schmidt@cs.wustl.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_T.h"
#include "ace/Task.h"
// Forward decls...
template <ACE_SYNCH_DECL> class ACE_Module;
template <ACE_SYNCH_DECL>
class ACE_Task : public ACE_Task_Base
{
// = TITLE
// Primary interface for application message processing, as well
// as input and output message queueing.
//
// = DESCRIPTION
// This class serves as the basis for passive and active objects
// in ACE.
public:
friend class ACE_Module<ACE_SYNCH_USE>;
friend class ACE_Module_Type;
// = Initialization/termination methods.
ACE_Task (ACE_Thread_Manager *thr_mgr = 0,
ACE_Message_Queue<ACE_SYNCH_USE> *mq = 0);
// 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.
virtual ~ACE_Task (void);
// Destructor.
ACE_Message_Queue<ACE_SYNCH_USE> *msg_queue (void);
// Gets the message queue associated with this task.
void msg_queue (ACE_Message_Queue<ACE_SYNCH_USE> *);
// Sets the message queue associated with this task.
public: // Should be protected:
// = Message queue manipulation methods.
// = Enqueue and dequeue methods.
// For the following five method if <timeout> == 0, the caller will
// block until action is possible, else will wait until the
// <{absolute}> time specified in *<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).
int putq (ACE_Message_Block *, ACE_Time_Value *timeout = 0);
// Insert message into the message queue. Note that <timeout> uses
// <{absolute}> time rather than <{relative}> time.
int getq (ACE_Message_Block *&mb, ACE_Time_Value *timeout = 0);
// Extract the first message from the queue (blocking). Note that
// <timeout> uses <{absolute}> time rather than <{relative}> time.
int ungetq (ACE_Message_Block *, ACE_Time_Value *timeout = 0);
// Return a message to the queue. Note that <timeout> uses
// <{absolute}> time rather than <{relative}> time.
int reply (ACE_Message_Block *, ACE_Time_Value *timeout = 0);
// Turn the message around and send it back down the Stream. Note
// that <timeout> uses <{absolute}> time rather than <{relative}>
// time.
int put_next (ACE_Message_Block *msg, ACE_Time_Value *timeout = 0);
// Transfer message to the adjacent ACE_Task in a ACE_Stream. Note
// that <timeout> uses <{absolute}> time rather than <{relative}>
// time.
int can_put (ACE_Message_Block *);
// Tests whether we can enqueue a message without blocking.
// = ACE_Task utility routines to identify names et al.
const ACE_TCHAR *name (void) const;
// Return the name of the enclosing Module if there's one associated
// with the Task, else returns 0.
// = Pointers to next ACE_Task_Base (if ACE is part of an ACE_Stream).
ACE_Task<ACE_SYNCH_USE> *next (void);
// Get next Task pointer.
void next (ACE_Task<ACE_SYNCH_USE> *);
// Set next Task pointer.
ACE_Task<ACE_SYNCH_USE> *sibling (void);
// Return the Task's sibling if there's one associated with the
// Task's Module, else returns 0.
ACE_Module<ACE_SYNCH_USE> *module (void) const;
// Return the Task's Module if there is one, else returns 0.
int flush (u_long flag = ACE_Task_Flags::ACE_FLUSHALL);
// Flush the queue. Note that if this conflicts with the C++
// iostream <flush> function, just rewrite the iostream function as
// ::<flush>.
// = Special routines corresponding to certain message types.
void water_marks (ACE_IO_Cntl_Msg::ACE_IO_Cntl_Cmds, size_t);
// Manipulate watermarks.
ACE_Message_Queue<ACE_SYNCH_USE> *msg_queue_;
// Queue of messages on the ACE_Task..
int delete_msg_queue_;
// 1 if should delete Message_Queue, 0 otherwise.
ACE_Module<ACE_SYNCH_USE> *mod_;
// Back-pointer to the enclosing module.
ACE_Task<ACE_SYNCH_USE> *next_;
// Pointer to adjacent ACE_Task.
void dump (void) const;
// Dump the state of an object.
ACE_ALLOC_HOOK_DECLARE;
// Declare the dynamic allocation hooks.
private:
// = Disallow these operations.
ACE_UNIMPLEMENTED_FUNC (void operator= (const ACE_Task<ACE_SYNCH_USE> &))
ACE_UNIMPLEMENTED_FUNC (ACE_Task (const ACE_Task<ACE_SYNCH_USE> &))
};
#if defined (__ACE_INLINE__)
#include "ace/Task_T.i"
#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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