Unblock the ACE_WFMO_Reactor
from its event loop, passing
it an optional ACE_Event_Handler
to dispatch.
#include <ace/WFMO_Reactor.h>
class ACE_WFMO_Reactor_Notify : public ACE_Event_Handler {
public:
ACE_WFMO_Reactor_Notify (void);
int open ( ACE_WFMO_Reactor &wfmo_reactor, ACE_Timer_Queue *timer_queue );
int notify ( ACE_Event_Handler *event_handler = 0, ACE_Reactor_Mask mask = ACE_Event_Handler::EXCEPT_MASK, ACE_Time_Value *timeout = 0 );
virtual ACE_HANDLE get_handle (void) const;
void max_notify_iterations (int);
int max_notify_iterations (void);
private:
ACE_Timer_Queue *timer_queue_;
virtual int handle_signal ( int signum, siginfo_t * = 0, ucontext_t * = 0 );
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 (void);
int open (
ACE_WFMO_Reactor &wfmo_reactor,
ACE_Timer_Queue *timer_queue
);
timer_queue
is stored to call gettimeofday.
int notify (
ACE_Event_Handler *event_handler = 0,
ACE_Reactor_Mask mask = ACE_Event_Handler::EXCEPT_MASK,
ACE_Time_Value *timeout = 0
);
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).
virtual ACE_HANDLE get_handle (void) const;
ACE_Auto_Event
.
void max_notify_iterations (int);
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.
int max_notify_iterations (void);
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.
ACE_Timer_Queue *timer_queue_;
virtual int handle_signal (
int signum,
siginfo_t * = 0,
ucontext_t * = 0
);
ACE_WFMO_Reactor
is signaled. This dequeues all pending
ACE_Event_Handlers
and dispatches them.
ACE_Auto_Event wakeup_one_thread_;
signal
it to wakeup one
thread up (e.g., when the notify
method is called).
ACE_Message_Queue<ACE_MT_SYNCH> message_queue_;
int max_notify_iterations_;
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."