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# 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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Collaboration 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=0)
| 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_Impl * | select_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.

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.

void ACE_Select_Reactor_Notify::max_notify_iterations | ( | int |  | ) | `[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::notify | ( | ACE_Event_Handler * | = `0`,
|  | ACE_Reactor_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 * | ,
|  | ACE_Timer_Queue * | = `0`,
|  | int | disable_notify_pipe = `0`
| ) | `[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> 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:

- Select_Reactor_Base.h
- Select_Reactor_Base.cpp