#include <WFMO_Reactor.h>
Inheritance diagram for ACE_WFMO_Reactor_Notify:
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_Queue * | timer_queue_ |
| Pointer to the wfmo_reactor's timer queue. | |
| ACE_Auto_Event | wakeup_one_thread_ |
| ACE_Message_Queue< ACE_MT_SYNCH > | message_queue_ |
| int | max_notify_iterations_ |
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.
| ACE_WFMO_Reactor_Notify::ACE_WFMO_Reactor_Notify | ( | size_t | max_notifies = 1024 |
) |
Constructor.
| int ACE_WFMO_Reactor_Notify::close | ( | void | ) | [virtual] |
| int ACE_WFMO_Reactor_Notify::dispatch_notifications | ( | int & | number_of_active_handles, | |
| ACE_Handle_Set & | rd_mask | |||
| ) | [virtual] |
| 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] |
| ACE_HANDLE ACE_WFMO_Reactor_Notify::get_handle | ( | void | ) | const [virtual] |
| int ACE_WFMO_Reactor_Notify::handle_signal | ( | int | signum, | |
| siginfo_t * | = 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] |
| 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 | ) | [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] |
| int ACE_WFMO_Reactor_Notify::purge_pending_notifications | ( | ACE_Event_Handler * | , | |
| ACE_Reactor_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.
int ACE_WFMO_Reactor_Notify::max_notify_iterations_ [private] |
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).
1.4.7-1