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