ACE_WFMO_Reactor_Notify Class Reference

Unblock the <ACE_WFMO_Reactor> from its event loop, passing it an optional ACE_Event_Handler to dispatch. More...

#include <WFMO_Reactor.h>

Inheritance diagram for ACE_WFMO_Reactor_Notify:
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Collaboration diagram for ACE_WFMO_Reactor_Notify:
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List of all members.

Public Member Functions

 ACE_WFMO_Reactor_Notify (size_t max_notifies=1024)
 Constructor.
virtual int open (ACE_Reactor_Impl *wfmo_reactor, ACE_Timer_Queue *timer_queue, int disable_notify=0)
 Initialization. <timer_queue> is stored to call <gettimeofday>.
virtual int close (void)
 No-op.
virtual int notify (ACE_Event_Handler *event_handler=0, ACE_Reactor_Mask 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)
 No-op.
virtual ACE_HANDLE get_handle (void) const
 Returns a handle to the <ACE_Auto_Event>.
virtual ACE_HANDLE notify_handle (void)
virtual int dispatch_notify (ACE_Notification_Buffer &buffer)
virtual int is_dispatchable (ACE_Notification_Buffer &buffer)
 Verify whether the buffer has dispatchable info or not.
virtual int read_notify_pipe (ACE_HANDLE handle, ACE_Notification_Buffer &buffer)
void max_notify_iterations (int)
int max_notify_iterations (void)
virtual int purge_pending_notifications (ACE_Event_Handler *, ACE_Reactor_Mask=ACE_Event_Handler::ALL_EVENTS_MASK)
virtual void dump (void) const
 Dump the state of an object.

Private Member Functions

virtual int handle_signal (int signum, siginfo_t *=0, ucontext_t *=0)

Private Attributes

ACE_Timer_Queuetimer_queue_
 Pointer to the wfmo_reactor's timer queue.
ACE_Auto_Event wakeup_one_thread_
ACE_Message_Queue< ACE_MT_SYNCHmessage_queue_
int max_notify_iterations_

Detailed Description

Unblock the <ACE_WFMO_Reactor> from its event loop, passing it an optional ACE_Event_Handler to dispatch.

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


Constructor & Destructor Documentation

ACE_WFMO_Reactor_Notify::ACE_WFMO_Reactor_Notify ( size_t  max_notifies = 1024  ) 

Constructor.


Member Function Documentation

int ACE_WFMO_Reactor_Notify::close ( void   )  [virtual]

No-op.

Implements ACE_Reactor_Notify.

int ACE_WFMO_Reactor_Notify::dispatch_notifications ( int &  number_of_active_handles,
ACE_Handle_Set rd_mask 
) [virtual]

No-op.

Implements ACE_Reactor_Notify.

int ACE_WFMO_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_WFMO_Reactor_Notify::dump ( void   )  const [virtual]

Dump the state of an object.

Implements ACE_Reactor_Notify.

ACE_HANDLE ACE_WFMO_Reactor_Notify::get_handle ( void   )  const [virtual]

Returns a handle to the <ACE_Auto_Event>.

Reimplemented from ACE_Event_Handler.

int ACE_WFMO_Reactor_Notify::handle_signal ( int  signum,
siginfo_t siginfo = 0,
ucontext_t = 0 
) [private, virtual]

Called when the notification event waited on by <ACE_WFMO_Reactor> is signaled. This dequeues all pending ACE_Event_Handlers and dispatches them.

Reimplemented from ACE_Event_Handler.

int ACE_WFMO_Reactor_Notify::is_dispatchable ( ACE_Notification_Buffer buffer  )  [virtual]

Verify whether the buffer has dispatchable info or not.

Implements ACE_Reactor_Notify.

int ACE_WFMO_Reactor_Notify::max_notify_iterations ( void   )  [virtual]

Get the maximum number of times that the <ACE_WFMO_Reactor_Notify::handle_input> method will iterate and dispatch the ACE_Event_Handlers that are passed in via the notify queue before breaking out of its <ACE_Message_Queue::dequeue> loop.

Implements ACE_Reactor_Notify.

void ACE_WFMO_Reactor_Notify::max_notify_iterations ( int  iterations  )  [virtual]

Set the maximum number of times that the <ACE_WFMO_Reactor_Notify::handle_input> method will iterate and dispatch the ACE_Event_Handlers that are passed in via the notify queue before breaking out of its <ACE_Message_Queue::dequeue> loop. By default, this is set to -1, which means "iterate until the queue 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_WFMO_Reactor_Notify::notify ( ACE_Event_Handler event_handler = 0,
ACE_Reactor_Mask  mask = ACE_Event_Handler::EXCEPT_MASK,
ACE_Time_Value timeout = 0 
) [virtual]

Special trick to unblock <WaitForMultipleObjects> when updates occur. All we do is enqueue event_handler and mask onto the ACE_Message_Queue and wakeup the <WFMO_Reactor> by signaling its <ACE_Event> handle. The ACE_Time_Value indicates how long to blocking trying to notify the <WFMO_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_WFMO_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 <Reactor_Impl>

Implements ACE_Reactor_Notify.

int ACE_WFMO_Reactor_Notify::open ( ACE_Reactor_Impl wfmo_reactor,
ACE_Timer_Queue timer_queue,
int  disable_notify = 0 
) [virtual]

Initialization. <timer_queue> is stored to call <gettimeofday>.

Implements ACE_Reactor_Notify.

int ACE_WFMO_Reactor_Notify::purge_pending_notifications ( ACE_Event_Handler eh,
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_WFMO_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>

Implements ACE_Reactor_Notify.


Member Data Documentation

Keeps track of the maximum number of times that the <ACE_WFMO_Reactor_Notify::handle_input> method will iterate and dispatch the ACE_Event_Handlers that are passed in via the notify queue before breaking out of its <ACE_Message_Queue::dequeue> loop. By default, this is set to -1, which means "iterate until the queue is empty."

Message queue that keeps track of pending ACE_Event_Handlers. This queue must be thread-safe because it can be called by multiple threads of control.

Pointer to the wfmo_reactor's timer queue.

An auto event is used so that we can <signal> it to wakeup one thread up (e.g., when the <notify> method is called).


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