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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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Public Member Functions

 ACE_Select_Reactor_Notify (void)
 Constructor. More...
 
virtual ~ACE_Select_Reactor_Notify (void)
 Destructor. More...
 
virtual int open (ACE_Reactor_Impl *, ACE_Timer_Queue *=0, int disable_notify_pipe=ACE_DISABLE_NOTIFY_PIPE_DEFAULT)
 Initialize. More...
 
virtual int close (void)
 Destroy. More...
 
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. More...
 
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. More...
 
- Public Member Functions inherited from ACE_Event_Handler
virtual ~ACE_Event_Handler (void)
 Destructor is virtual to enable proper cleanup. More...
 
virtual ACE_HANDLE get_handle (void) const
 Get the I/O handle. More...
 
virtual void set_handle (ACE_HANDLE)
 Set the I/O handle. More...
 
virtual int priority (void) const
 
virtual void priority (int priority)
 Set the priority of the Event_Handler. More...
 
virtual int handle_output (ACE_HANDLE fd=ACE_INVALID_HANDLE)
 
virtual int handle_exception (ACE_HANDLE fd=ACE_INVALID_HANDLE)
 Called when an exceptional events occur (e.g., SIGURG). More...
 
virtual int handle_timeout (const ACE_Time_Value &current_time, const void *act=0)
 
virtual int handle_exit (ACE_Process *)
 Called when a process exits. More...
 
virtual int handle_close (ACE_HANDLE handle, ACE_Reactor_Mask close_mask)
 
virtual int handle_signal (int signum, siginfo_t *=0, ucontext_t *=0)
 
virtual int resume_handler (void)
 
virtual int handle_qos (ACE_HANDLE=ACE_INVALID_HANDLE)
 
virtual int handle_group_qos (ACE_HANDLE=ACE_INVALID_HANDLE)
 
virtual void reactor (ACE_Reactor *reactor)
 Set the event demultiplexors. More...
 
virtual ACE_Reactorreactor (void) const
 Get the event demultiplexors. More...
 
virtual
ACE_Reactor_Timer_Interface
reactor_timer_interface (void) const
 Get only the reactor's timer related interface. More...
 
virtual Reference_Count add_reference (void)
 Increment reference count on the handler. More...
 
virtual Reference_Count remove_reference (void)
 Decrement reference count on the handler. More...
 
Reference_Counting_Policyreference_counting_policy (void)
 Current Reference_Counting_Policy. More...
 

Public Attributes

 ACE_ALLOC_HOOK_DECLARE
 Declare the dynamic allocation hooks. More...
 

Protected Attributes

ACE_Select_Reactor_Implselect_reactor_
 
ACE_Pipe notification_pipe_
 
int max_notify_iterations_
 
- Protected Attributes inherited from ACE_Event_Handler
Atomic_Reference_Count reference_count_
 Reference count. More...
 

Additional Inherited Members

- Public Types inherited from ACE_Event_Handler
enum  {
  LO_PRIORITY = 0, HI_PRIORITY = 10, NULL_MASK = 0, READ_MASK = (1 << 0),
  WRITE_MASK = (1 << 1), EXCEPT_MASK = (1 << 2), ACCEPT_MASK = (1 << 3), CONNECT_MASK = (1 << 4),
  TIMER_MASK = (1 << 5), QOS_MASK = (1 << 6), GROUP_QOS_MASK = (1 << 7), SIGNAL_MASK = (1 << 8),
  ALL_EVENTS_MASK, RWE_MASK, DONT_CALL = (1 << 9)
}
 
enum  { ACE_EVENT_HANDLER_NOT_RESUMED = -1, ACE_REACTOR_RESUMES_HANDLER = 0, ACE_APPLICATION_RESUMES_HANDLER }
 
typedef long Reference_Count
 Reference count type. More...
 
- Static Public Member Functions inherited from ACE_Event_Handler
static ACE_THR_FUNC_RETURN read_adapter (void *event_handler)
 
static int register_stdin_handler (ACE_Event_Handler *eh, ACE_Reactor *reactor, ACE_Thread_Manager *thr_mgr, int flags=THR_DETACHED)
 
static int remove_stdin_handler (ACE_Reactor *reactor, ACE_Thread_Manager *thr_mgr)
 Performs the inverse of the register_stdin_handler() method. More...
 
- Protected Types inherited from ACE_Event_Handler
typedef ACE_Atomic_Op
< ACE_SYNCH_MUTEX,
Reference_Count
Atomic_Reference_Count
 Typedef for implementation of reference counting. More...
 
- Protected Member Functions inherited from ACE_Event_Handler
 ACE_Event_Handler (ACE_Reactor *=0, int priority=ACE_Event_Handler::LO_PRIORITY)
 Force ACE_Event_Handler to be an abstract base class. More...
 

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: