ACE  6.1.7
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Public Member Functions | Public Attributes | Protected Attributes
ACE_Select_Reactor_Notify Class Reference

Unblock the ACE_Select_Reactor from its event loop. More...

#include <Select_Reactor_Base.h>

Inheritance diagram for ACE_Select_Reactor_Notify:
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List of all members.

Public Member Functions

 ACE_Select_Reactor_Notify (void)
 Constructor.
virtual ~ACE_Select_Reactor_Notify (void)
 Destructor.
virtual int open (ACE_Reactor_Impl *, ACE_Timer_Queue *=0, int disable_notify_pipe=ACE_DISABLE_NOTIFY_PIPE_DEFAULT)
 Initialize.
virtual int close (void)
 Destroy.
virtual int notify (ACE_Event_Handler *=0, ACE_Reactor_Mask=ACE_Event_Handler::EXCEPT_MASK, ACE_Time_Value *timeout=0)
virtual int dispatch_notifications (int &number_of_active_handles, ACE_Handle_Set &rd_mask)
virtual ACE_HANDLE notify_handle (void)
virtual int dispatch_notify (ACE_Notification_Buffer &buffer)
virtual int read_notify_pipe (ACE_HANDLE handle, ACE_Notification_Buffer &buffer)
virtual int is_dispatchable (ACE_Notification_Buffer &buffer)
 Verify whether the buffer has dispatchable info or not.
virtual int handle_input (ACE_HANDLE handle)
virtual void max_notify_iterations (int)
virtual int max_notify_iterations (void)
virtual int purge_pending_notifications (ACE_Event_Handler *sh, ACE_Reactor_Mask mask=ACE_Event_Handler::ALL_EVENTS_MASK)
virtual void dump (void) const
 Dump the state of an object.

Public Attributes

 ACE_ALLOC_HOOK_DECLARE
 Declare the dynamic allocation hooks.

Protected Attributes

ACE_Select_Reactor_Implselect_reactor_
ACE_Pipe notification_pipe_
int max_notify_iterations_

Detailed Description

Unblock the ACE_Select_Reactor from its event loop.

This implementation is necessary for cases where the ACE_Select_Reactor is run in a multi-threaded program. In this case, we need to be able to unblock select or poll when updates occur other than in the main ACE_Select_Reactor thread. To do this, we signal an auto-reset event the ACE_Select_Reactor is listening on. If an ACE_Event_Handler and ACE_Select_Reactor_Mask is passed to notify, the appropriate handle_* method is dispatched in the context of the ACE_Select_Reactor thread.


Constructor & Destructor Documentation

ACE_Select_Reactor_Notify::ACE_Select_Reactor_Notify ( void  )

Constructor.

ACE_Select_Reactor_Notify::~ACE_Select_Reactor_Notify ( void  )
virtual

Destructor.


Member Function Documentation

int ACE_Select_Reactor_Notify::close ( void  )
virtual

Destroy.

Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::dispatch_notifications ( int &  number_of_active_handles,
ACE_Handle_Set rd_mask 
)
virtual

Handles pending threads (if any) that are waiting to unblock the ACE_Select_Reactor.

Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::dispatch_notify ( ACE_Notification_Buffer buffer)
virtual

Handle one of the notify call on the handle. This could be because of a thread trying to unblock the Reactor_Impl

Implements ACE_Reactor_Notify.

void ACE_Select_Reactor_Notify::dump ( void  ) const
virtual

Dump the state of an object.

Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::handle_input ( ACE_HANDLE  handle)
virtual

Called back by the ACE_Select_Reactor when a thread wants to unblock us.

Reimplemented from ACE_Event_Handler.

int ACE_Select_Reactor_Notify::is_dispatchable ( ACE_Notification_Buffer buffer)
virtual

Verify whether the buffer has dispatchable info or not.

Implements ACE_Reactor_Notify.

void ACE_Select_Reactor_Notify::max_notify_iterations ( int  iterations)
virtual

Set the maximum number of times that the ACE_Select_Reactor_Notify::handle_input() method will iterate and dispatch the ACE_Event_Handlers that are passed in via the notify pipe before breaking out of its recv loop. By default, this is set to -1, which means "iterate until the pipe is empty." Setting this to a value like "1 or 2" will increase "fairness" (and thus prevent starvation) at the expense of slightly higher dispatching overhead.

Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::max_notify_iterations ( void  )
virtual

Get the maximum number of times that the ACE_Select_Reactor_Notify::handle_input() method will iterate and dispatch the ACE_Event_Handlers that are passed in via the notify pipe before breaking out of its recv loop.

Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::notify ( ACE_Event_Handler event_handler = 0,
ACE_Reactor_Mask  mask = ACE_Event_Handler::EXCEPT_MASK,
ACE_Time_Value timeout = 0 
)
virtual

Called by a thread when it wants to unblock the ACE_Select_Reactor. This wakeups the ACE_Select_Reactor if currently blocked in select/poll. Pass over both the Event_Handler and the mask to allow the caller to dictate which Event_Handler method the ACE_Select_Reactor will invoke. The ACE_Time_Value indicates how long to blocking trying to notify the ACE_Select_Reactor. If timeout == 0, the caller will block until action is possible, else will wait until the relative time specified in *timeout elapses).

Implements ACE_Reactor_Notify.

ACE_HANDLE ACE_Select_Reactor_Notify::notify_handle ( void  )
virtual

Returns the ACE_HANDLE of the notify pipe on which the reactor is listening for notifications so that other threads can unblock the Select_Reactor

Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::open ( ACE_Reactor_Impl r,
ACE_Timer_Queue = 0,
int  disable_notify_pipe = ACE_DISABLE_NOTIFY_PIPE_DEFAULT 
)
virtual

Initialize.

Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::purge_pending_notifications ( ACE_Event_Handler sh,
ACE_Reactor_Mask  mask = ACE_Event_Handler::ALL_EVENTS_MASK 
)
virtual

Purge any notifications pending in this reactor for the specified ACE_Event_Handler object. If eh == 0, all notifications for all handlers are removed (but not any notifications posted just to wake up the reactor itself). Returns the number of notifications purged. Returns -1 on error.

Implements ACE_Reactor_Notify.

int ACE_Select_Reactor_Notify::read_notify_pipe ( ACE_HANDLE  handle,
ACE_Notification_Buffer buffer 
)
virtual

Read one of the notify call on the handle into the buffer. This could be because of a thread trying to unblock the Reactor_Impl

Return value semantics for this are: -1: nothing read, fatal, unrecoverable error 0: nothing read at all 1: complete buffer read

Implements ACE_Reactor_Notify.


Member Data Documentation

ACE_Select_Reactor_Notify::ACE_ALLOC_HOOK_DECLARE

Declare the dynamic allocation hooks.

int ACE_Select_Reactor_Notify::max_notify_iterations_
protected

Keeps track of the maximum number of times that the ACE_Select_Reactor_Notify::handle_input() method will iterate and dispatch the ACE_Event_Handlers that are passed in via the notify pipe before breaking out of its recv loop. By default, this is set to -1, which means "iterate until the pipe is empty."

ACE_Pipe ACE_Select_Reactor_Notify::notification_pipe_
protected

Contains the ACE_HANDLE the ACE_Select_Reactor is listening on, as well as the ACE_HANDLE that threads wanting the attention of the ACE_Select_Reactor will write to.

ACE_Select_Reactor_Impl* ACE_Select_Reactor_Notify::select_reactor_
protected

Keep a back pointer to the ACE_Select_Reactor. If this value if NULL then the ACE_Select_Reactor has been initialized with disable_notify_pipe.


The documentation for this class was generated from the following files: