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126 lines
4 KiB
C++
126 lines
4 KiB
C++
// -*- C++ -*-
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//=============================================================================
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/**
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* @file SUN_Proactor.h
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*
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* $Id: SUN_Proactor.h 80826 2008-03-04 14:51:23Z wotte $
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*
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* @author Alexander Libman <alibman@baltimore.com>
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*/
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//=============================================================================
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#ifndef ACE_SUN_PROACTOR_H
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#define ACE_SUN_PROACTOR_H
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#include /**/ "ace/config-all.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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#if defined (ACE_HAS_AIO_CALLS) && defined (sun)
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#include "ace/POSIX_Proactor.h"
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#include /**/ <sys/asynch.h> // Sun native aio calls
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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/**
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* @class ACE_SUN_Proactor
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*
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* @brief Implementation of the fast and reliable Proactor
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* for SunOS 5.6, 5.7, etc.
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*
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* This proactor, based on ACE_POSIX_AIOCB_Proactor,
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* works with Sun native interface for aio calls.
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* POSIX_API Native SUN_API
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* aio_read aioread
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* aio_write aiowrite
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* aio_suspend aiowait
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* aio_error aio_result_t.errno
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* aio_return aio_result_t.return
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* On Solaris, the Sun <aio*()> native implementation is more
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* reliable and efficient than POSIX <aio_*()> implementation.
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* There is a problem of lost RT signals with POSIX, if we start
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* more than SIGQUEUEMAX asynchronous operations at the same
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* time.
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* The Sun <aiocb> it is not the standard POSX <aiocb>, instead,
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* it has the following structure:
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* typedef struct aiocb
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* {
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* int aio_fildes; File descriptor
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* void *aio_buf; buffer location
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* size_t aio_nbytes; length of transfer
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* off_t aio_offset; file offset
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* int aio_reqprio; request priority offset
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* sigevent aio_sigevent; signal number and offset
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* int aio_lio_opcode; listio operation
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* aio_result_t aio_resultp; results
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* int aio_state; state flag for List I/O
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* int aio__pad[1]; extension padding
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* };
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*/
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class ACE_Export ACE_SUN_Proactor : public ACE_POSIX_AIOCB_Proactor
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{
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public:
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virtual Proactor_Type get_impl_type (void);
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/// Destructor.
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virtual ~ACE_SUN_Proactor (void);
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/// Constructor defines max number asynchronous operations that can
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/// be started at the same time.
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ACE_SUN_Proactor (size_t max_aio_operations = ACE_AIO_DEFAULT_SIZE);
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protected:
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/**
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* Dispatch a single set of events. If @a wait_time elapses before
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* any events occur, return 0. Return 1 on success i.e., when a
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* completion is dispatched, non-zero (-1) on errors and errno is
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* set accordingly.
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*/
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virtual int handle_events (ACE_Time_Value &wait_time);
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/**
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* Block indefinitely until at least one event is dispatched.
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* Dispatch a single set of events. Return 1 on success i.e., when a
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* completion is dispatched, non-zero (-1) on errors and errno is
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* set accordingly.
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*/
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virtual int handle_events (void);
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/// Internal completion detection and dispatching.
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int handle_events_i (ACE_Time_Value *delta);
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/// Initiate an aio operation.
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virtual int start_aio_i (ACE_POSIX_Asynch_Result *result);
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/// Check AIO for completion, error and result status
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/// Return: 1 - AIO completed , 0 - not completed yet
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virtual int get_result_status (ACE_POSIX_Asynch_Result* asynch_result,
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int &error_status,
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size_t &transfer_count);
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/// Extract the results of aio.
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ACE_POSIX_Asynch_Result *find_completed_aio (aio_result_t *result,
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int &error_status,
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size_t &transfer_count);
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/// From ACE_POSIX_AIOCB_Proactor.
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/// Attempt to cancel running request
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virtual int cancel_aiocb (ACE_POSIX_Asynch_Result *result);
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/// Specific Sun aiowait
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int wait_for_start (ACE_Time_Value * abstime);
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/// Condition variable .
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/// used to wait the first AIO start
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ACE_SYNCH_CONDITION condition_;
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};
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ACE_END_VERSIONED_NAMESPACE_DECL
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#endif /* ACE_HAS_AIO_CALLS && sun */
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#endif /* ACE_SUN_PROACTOR_H*/
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