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/* -*- C++ -*- */
//=============================================================================
/**
* @file Reactor.h
*
* $Id$
*
* @author Irfan Pyarali <irfan@cs.wustl.edu>
* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
*/
//=============================================================================
#ifndef ACE_REACTOR_H
#define ACE_REACTOR_H
#include "ace/pre.h"
class ACE_Reactor_Impl;
// Need the class def for ACE_Handle_Set to compile references to it in
// programs.
#include "ace/Handle_Set.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
// Timer Queue is a complicated template class. A simple forward
// declaration will not work
#include "ace/Timer_Queue.h"
// Event_Handler.h contains the definition of ACE_Reactor_Mask
#include "ace/Event_Handler.h"
// We are using 4 or 5 signal classes, we could forward declare
// them.... But Timer_Queue_T.h includes Signal.h, so I don't think
// forward declaration will be useful here
#include "ace/Signal.h"
/**
* @class ACE_Reactor
*
* @brief The responsibility of this class is to forward all methods to
* its delegation/implementation class, e.g.,
* <ACE_Select_Reactor> or <ACE_WFMO_Reactor>.
*/
class ACE_Export ACE_Reactor
{
public:
/// Operations on the "ready" mask and the "dispatch" mask.
enum
{
/// Retrieve current value of the the "ready" mask or the
/// "dispatch" mask.
GET_MASK = 1,
/// Set value of bits to new mask (changes the entire mask).
SET_MASK = 2,
/// Bitwise "or" the value into the mask (only changes enabled
/// bits).
ADD_MASK = 3,
/// Bitwise "and" the negation of the value out of the mask (only
/// changes enabled bits).
CLR_MASK = 4
};
/**
* You can add a hook to various run_event methods and the hook will
* be called after handling every reactor event. If this function
* returns 0, <run_reactor_event_loop> will check for the return
* value of <handle_event>. If it is -1, the
* <run_reactor_event_loop> will return (pre-maturely.)
*/
typedef int (*REACTOR_EVENT_HOOK)(ACE_Reactor *);
/// Get pointer to a process-wide <ACE_Reactor>.
static ACE_Reactor *instance (void);
/**
* Set pointer to a process-wide <ACE_Reactor> and return existing
* pointer. If <delete_reactor> != 0 then we'll delete the Reactor
* at destruction time.
*/
static ACE_Reactor *instance (ACE_Reactor *,
int delete_reactor = 0);
/// Delete the dynamically allocated Singleton
static void close_singleton (void);
// = Singleton reactor event loop management methods.
// Note that these method ONLY work on the "Singleton Reactor,"
// i.e., the one returned from <ACE_Reactor::instance>.
/**
* Run the event loop until the
* <ACE_Reactor::handle_events/ACE_Reactor::alertable_handle_events>
* method returns -1 or the <end_event_loop> method is invoked.
* Note that this method can only be used by the singleton
* <ACE_Reactor::instance>. Thus, to run another reactor use
* <ACE_Reactor::run_reactor_event_loop>.
*/
static int run_event_loop (void);
static int run_alertable_event_loop (void);
/**
* Run the event loop until the <ACE_Reactor::handle_events> or
* <ACE_Reactor::alertable_handle_events> methods returns -1, the
* <end_event_loop> method is invoked, or the <ACE_Time_Value>
* expires. Note that this method can only be used by the singleton
* <ACE_Reactor::instance>. Thus, to run another reactor use
* <ACE_Reactor::run_reactor_event_loop>.
*/
static int run_event_loop (ACE_Time_Value &tv);
static int run_alertable_event_loop (ACE_Time_Value &tv);
/**
* Instruct the <ACE_Reactor::instance> to terminate its event loop
* and notifies the <ACE_Reactor::instance> so that it can wake up
* and close down gracefully. Note that this method can only be
* used by the singleton <ACE_Reactor::instance>. Thus, to
* terminate another reactor, use
* <ACE_Reactor::end_reactor_event_loop>.
*/
static int end_event_loop (void);
/**
* Report if the <ACE_Reactor::instance>'s event loop is finished.
* Note that this method can only be used by the singleton
* <ACE_Reactor::instance>. Thus, to check another reactor use
* <ACE_Reactor::reactor_event_loop_done>.
*/
static int event_loop_done (void);
/**
* Resets the <ACE_Reactor::end_event_loop_> static so that the
* <run_event_loop> method can be restarted. Note that this method
* can only be used by the singleton <ACE_Reactor::instance>. Thus,
* to reset another reactor use <ACE_Reactor::reset_reactor_event_loop>.
*/
static void reset_event_loop (void);
/**
* The singleton reactor is used by the <ACE_Service_Config>.
* Therefore, we must check for the reconfiguration request and
* handle it after handling an event.
*/
static int check_reconfiguration (ACE_Reactor *);
// = Reactor event loop management methods.
// These methods work with an instance of a reactor.
/**
* Run the event loop until the
* <ACE_Reactor::handle_events/ACE_Reactor::alertable_handle_events>
* method returns -1 or the <end_reactor_event_loop> method is invoked.
*/
virtual int run_reactor_event_loop (REACTOR_EVENT_HOOK = 0);
virtual int run_alertable_reactor_event_loop (REACTOR_EVENT_HOOK = 0);
/**
* Run the event loop until the <ACE_Reactor::handle_events> or
* <ACE_Reactor::alertable_handle_events> methods returns -1, the
* <end_reactor_event_loop> method is invoked, or the <ACE_Time_Value>
* expires.
*/
virtual int run_reactor_event_loop (ACE_Time_Value &tv,
REACTOR_EVENT_HOOK = 0);
virtual int run_alertable_reactor_event_loop (ACE_Time_Value &tv,
REACTOR_EVENT_HOOK = 0);
/**
* Instruct the Reactor to terminate its event loop and notifies the
* Reactor so that it can wake up and deactivate
* itself. Deactivating the Reactor would allow the Reactor to be
* shutdown gracefully. Internally the Reactor calls deactivate ()
* on the underlying implementation.
*/
virtual int end_reactor_event_loop (void);
/// Indicate if the Reactor's event loop has been ended.
virtual int reactor_event_loop_done (void);
/// Resets the <ACE_Reactor::end_event_loop_> static so that the
/// <run_event_loop> method can be restarted.
virtual void reset_reactor_event_loop (void);
/**
* Create the Reactor using <implementation>. The flag
* <delete_implementation> tells the Reactor whether or not to
* delete the <implementation> on destruction.
*/
ACE_Reactor (ACE_Reactor_Impl *implementation = 0,
int delete_implementation = 0);
/// Close down and release all resources.
virtual ~ACE_Reactor (void);
/**
* Initialize the <ACE_Reactor> to manage <max_number_of_handles>.
* If <restart> is non-0 then the <ACE_Reactor>'s <handle_events>
* method will be restarted automatically when <EINTR> occurs. If
* <signal_handler> or <timer_queue> are non-0 they are used as the
* signal handler and timer queue, respectively.
*/
virtual int open (size_t max_number_of_handles,
int restart = 0,
ACE_Sig_Handler *signal_handler = 0,
ACE_Timer_Queue *timer_queue = 0);
/// Use a user specified signal handler instead.
virtual int set_sig_handler (ACE_Sig_Handler *signal_handler);
// = The following method is deprecated. Use <timer_queue> instead.
/// Set a user specified timer queue.
virtual int set_timer_queue (ACE_Timer_Queue *tq);
/// Set a user-specified timer queue.
/// Return the current <ACE_Timer_Queue>.
virtual int timer_queue (ACE_Timer_Queue *tq);
virtual ACE_Timer_Queue *timer_queue (void) const;
/// Close down and release all resources.
virtual int close (void);
// = Event loop drivers.
/**
* Returns non-zero if there are I/O events "ready" for dispatching,
* but does not actually dispatch the event handlers. By default,
* don't block while checking this, i.e., "poll".
*/
virtual int work_pending (const ACE_Time_Value &max_wait_time = ACE_Time_Value::zero);
/**
* This event loop driver blocks for up to <max_wait_time> before
* returning. It will return earlier if events occur. Note that
* <max_wait_time> can be 0, in which case this method blocks
* indefinitely until events occur.
*
* <max_wait_time> is decremented to reflect how much time this call
* took. For instance, if a time value of 3 seconds is passed to
* handle_events and an event occurs after 2 seconds,
* <max_wait_time> will equal 1 second. This can be used if an
* application wishes to handle events for some fixed amount of
* time.
*
* Returns the total number of timers and I/O <ACE_Event_Handler>s
* that were dispatched, 0 if the <max_wait_time> elapsed without
* dispatching any handlers, or -1 if an error occurs.
*
* The only difference between <alertable_handle_events> and
* <handle_events> is that in the alertable case, the eventloop will
* return when the system queues an I/O completion routine or an
* Asynchronous Procedure Call.
*/
virtual int handle_events (ACE_Time_Value *max_wait_time = 0);
virtual int alertable_handle_events (ACE_Time_Value *max_wait_time = 0);
/**
* This method is just like the one above, except the
* <max_wait_time> value is a reference and can therefore never be
* NULL.
*
* The only difference between <alertable_handle_events> and
* <handle_events> is that in the alertable case, the eventloop will
* return when the system queues an I/O completion routine or an
* Asynchronous Procedure Call.
*/
virtual int handle_events (ACE_Time_Value &max_wait_time);
virtual int alertable_handle_events (ACE_Time_Value &max_wait_time);
// = Register and remove Handlers.
/// Register <event_handler> with <mask>. The I/O handle will always
/// come from <get_handle> on the <event_handler>.
virtual int register_handler (ACE_Event_Handler *event_handler,
ACE_Reactor_Mask mask);
/// Register <event_handler> with <mask>. The I/O handle is provided
/// through the <io_handle> parameter.
virtual int register_handler (ACE_HANDLE io_handle,
ACE_Event_Handler *event_handler,
ACE_Reactor_Mask mask);
#if defined (ACE_WIN32)
/**
* Register an <event_handler> that will be notified when
* <event_handle> is signaled. Since no event mask is passed
* through this interface, it is assumed that the <event_handle>
* being passed in is an event handle and not an I/O handle.
*
* Originally this interface was available for all platforms, but
* because ACE_HANDLE is an int on non-Win32 platforms, compilers
* are not able to tell the difference between
* register_handler(ACE_Event_Handler*,ACE_Reactor_Mask) and
* register_handler(ACE_Event_Handler*,ACE_HANDLE). Therefore, we
* have restricted this method to Win32 only.
*/
virtual int register_handler (ACE_Event_Handler *event_handler,
ACE_HANDLE event_handle = ACE_INVALID_HANDLE);
#endif /* ACE_WIN32 */
/**
* Register an <event_handler> that will be notified when
* <event_handle> is signaled. <mask> specifies the network events
* that the <event_handler> is interested in.
*/
virtual int register_handler (ACE_HANDLE event_handle,
ACE_HANDLE io_handle,
ACE_Event_Handler *event_handler,
ACE_Reactor_Mask mask);
/// Register <event_handler> with all the <handles> in the <Handle_Set>.
virtual int register_handler (const ACE_Handle_Set &handles,
ACE_Event_Handler *event_handler,
ACE_Reactor_Mask mask);
/**
* Register <new_sh> to handle the signal <signum> using the
* <new_disp>. Returns the <old_sh> that was previously registered
* (if any), along with the <old_disp> of the signal handler.
*/
virtual int register_handler (int signum,
ACE_Event_Handler *new_sh,
ACE_Sig_Action *new_disp = 0,
ACE_Event_Handler **old_sh = 0,
ACE_Sig_Action *old_disp = 0);
/// Registers <new_sh> to handle a set of signals <sigset> using the
/// <new_disp>.
virtual int register_handler (const ACE_Sig_Set &sigset,
ACE_Event_Handler *new_sh,
ACE_Sig_Action *new_disp = 0);
/**
* Removes <event_handler>. Note that the I/O handle will be
* obtained using <get_handle> method of <event_handler> . If
* <mask> includes <ACE_Event_Handler::DONT_CALL> then the
* <handle_close> method of the <event_handler> is not invoked.
*/
virtual int remove_handler (ACE_Event_Handler *event_handler,
ACE_Reactor_Mask mask);
/**
* Removes the <ACE_Event_Handler> associated with <handle>. If
* <mask> includes <ACE_Event_Handler::DONT_CALL> then the
* <handle_close> method of the associated <event_handler> is not
* invoked.
*/
virtual int remove_handler (ACE_HANDLE handle,
ACE_Reactor_Mask mask);
/**
* Removes all handles in <handle_set>. If <mask> ==
* <ACE_Event_Handler::DONT_CALL> then the <handle_close> method of
* the associated <event_handler>s is not invoked.
*/
virtual int remove_handler (const ACE_Handle_Set &handle_set,
ACE_Reactor_Mask mask);
/**
* Remove the ACE_Event_Handler currently associated with <signum>.
* Install the new disposition (if given) and return the previous
* disposition (if desired by the caller). Returns 0 on success and
* -1 if <signum> is invalid.
*/
virtual int remove_handler (int signum,
ACE_Sig_Action *new_disp,
ACE_Sig_Action *old_disp = 0,
int sigkey = -1);
/// Calls <remove_handler> for every signal in <sigset>.
virtual int remove_handler (const ACE_Sig_Set &sigset);
// = Suspend and resume Handlers.
/// Suspend <event_handler> temporarily. Use
/// <ACE_Event_Handler::get_handle> to get the handle.
virtual int suspend_handler (ACE_Event_Handler *event_handler);
/// Suspend <handle> temporarily.
virtual int suspend_handler (ACE_HANDLE handle);
/// Suspend all <handles> in handle set temporarily.
virtual int suspend_handler (const ACE_Handle_Set &handles);
/// Suspend all <handles> temporarily.
virtual int suspend_handlers (void);
/// Resume <event_handler>. Use <ACE_Event_Handler::get_handle> to
/// get the handle.
virtual int resume_handler (ACE_Event_Handler *event_handler);
/// Resume <handle>.
virtual int resume_handler (ACE_HANDLE handle);
/// Resume all <handles> in handle set.
virtual int resume_handler (const ACE_Handle_Set &handles);
/// Resume all <handles>.
virtual int resume_handlers (void);
/// Does the reactor allow the application to resume the handle on
/// its own ie. can it pass on the control of handle resumption to
/// the application. A positive value indicates that the handlers
/// are application resumable. A value of 0 indicates otherwise.
virtual int resumable_handler (void);
// = Timer management.
/**
* Schedule an ACE_Event_Handler that will expire after an amount
* of time. The return value of this method, a timer_id value,
* uniquely identifies the event_handler in the ACE_Reactor's
* internal list of timers.
* This timer_id value can be used to cancel the timer
* with the cancel_timer() call.
*
* @see cancel_timer()
* @see reset_timer_interval()
*
* @param event_handler event handler to schedule on reactor
* @param arg argument passed to the handle_timeout() method of event_handler
* @param delay time interval after which the timer will expire
* @param interval time interval after which the timer will be automatically rescheduled
* @return -1 on failure, a timer_id value on success
*/
virtual long schedule_timer (ACE_Event_Handler *event_handler,
const void *arg,
const ACE_Time_Value &delay,
const ACE_Time_Value &interval = ACE_Time_Value::zero);
/**
* Resets the interval of the timer represented by <timer_id> to
* <interval>, which is specified in relative time to the current
* <gettimeofday>. If <interval> is equal to
* <ACE_Time_Value::zero>, the timer will become a non-rescheduling
* timer. Returns 0 if successful, -1 if not.
*/
virtual int reset_timer_interval (long timer_id,
const ACE_Time_Value &interval);
/// Cancel all <Event_Handler>s that match the address of
/// <event_handler>. Returns number of handlers cancelled.
virtual int cancel_timer (ACE_Event_Handler *event_handler,
int dont_call_handle_close = 1);
/**
* Cancel the single <Event_Handler> that matches the <timer_id>
* value, which was returned from the schedule method. If arg is
* non-NULL then it will be set to point to the ``magic cookie''
* argument passed in when the Event_Handler was registered. This
* makes it possible to free up the memory and avoid memory leaks.
* Returns 1 if cancellation succeeded and 0 if the <timer_id>
* wasn't found.
*/
virtual int cancel_timer (long timer_id,
const void **arg = 0,
int dont_call_handle_close = 1);
// = High-level Event_Handler scheduling operations
/// Add <masks_to_be_added> to the <event_handler>'s entry.
/// <event_handler> must already have been registered.
/// Note that this call does not cause the Reactor to re-examine
/// its set of handlers - the new masks will be noticed the next
/// time the Reactor waits for activity. If there is no other
/// activity expected, or you need immediate re-examination of
/// the wait masks, either call ACE_Reactor::notify after this
/// call, or use ACE_Reactor::register_handler instead.
virtual int schedule_wakeup (ACE_Event_Handler *event_handler,
ACE_Reactor_Mask masks_to_be_added);
/// Add <masks_to_be_added> to the <handle>'s entry. <event_handler>
/// associated with <handle> must already have been registered.
/// Note that this call does not cause the Reactor to re-examine
/// its set of handlers - the new masks will be noticed the next
/// time the Reactor waits for activity. If there is no other
/// activity expected, or you need immediate re-examination of
/// the wait masks, either call ACE_Reactor::notify after this
/// call, or use ACE_Reactor::register_handler instead.
virtual int schedule_wakeup (ACE_HANDLE handle,
ACE_Reactor_Mask masks_to_be_added);
/// Clear <masks_to_be_cleared> from the <event_handler>'s entry.
/// Note that this call does not cause the Reactor to re-examine
/// its set of handlers - the new masks will be noticed the next
/// time the Reactor waits for activity. If there is no other
/// activity expected, or you need immediate re-examination of
/// the wait masks, either call ACE_Reactor::notify after this
/// call, or use ACE_Reactor::register_handler instead.
virtual int cancel_wakeup (ACE_Event_Handler *event_handler,
ACE_Reactor_Mask masks_to_be_cleared);
/// Clear <masks_to_be_cleared> from the <handle>'s entry.
/// Note that this call does not cause the Reactor to re-examine
/// its set of handlers - the new masks will be noticed the next
/// time the Reactor waits for activity. If there is no other
/// activity expected, or you need immediate re-examination of
/// the wait masks, either call ACE_Reactor::notify after this
/// call, or use ACE_Reactor::register_handler instead.
virtual int cancel_wakeup (ACE_HANDLE handle,
ACE_Reactor_Mask masks_to_be_cleared);
// = Notification methods.
/**
* Notify <event_handler> of <mask> event. The <ACE_Time_Value>
* indicates how long to blocking trying to notify. If <timeout> ==
* 0, the caller will block until action is possible, else will wait
* until the relative time specified in <timeout> elapses).
*/
virtual int notify (ACE_Event_Handler *event_handler = 0,
ACE_Reactor_Mask mask = ACE_Event_Handler::EXCEPT_MASK,
ACE_Time_Value *tv = 0);
/**
* Set the maximum number of times that ACE_Reactor 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.
*/
virtual void max_notify_iterations (int iterations);
/**
* Get the maximum number of times that the ACE_Reactor 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.
*/
virtual int max_notify_iterations (void);
/**
* 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.
*/
virtual int purge_pending_notifications (ACE_Event_Handler *,
ACE_Reactor_Mask = ACE_Event_Handler::ALL_EVENTS_MASK);
// = Assorted helper methods.
/**
* Check to see if <handle> is associated with a valid Event_Handler
* bound to <mask>. Return the <event_handler> associated with this
* <handler> if <event_handler> != 0.
*/
virtual int handler (ACE_HANDLE handle,
ACE_Reactor_Mask mask,
ACE_Event_Handler **event_handler = 0);
/**
* Check to see if <signum> is associated with a valid Event_Handler
* bound to a signal. Return the <event_handler> associated with
* this <handler> if <event_handler> != 0.
*/
virtual int handler (int signum,
ACE_Event_Handler **event_handler = 0);
/// Returns true if Reactor has been successfully initialized, else
/// false.
virtual int initialized (void);
/// Returns the current size of the Reactor's internal descriptor
/// table.
virtual size_t size (void) const;
/// Returns a reference to the Reactor's internal lock.
virtual ACE_Lock &lock (void);
/// Wake up all threads in waiting in the event loop
virtual void wakeup_all_threads (void);
/// Transfers ownership of Reactor to the <new_owner>.
virtual int owner (ACE_thread_t new_owner,
ACE_thread_t *old_owner = 0);
/// Return the ID of the "owner" thread.
virtual int owner (ACE_thread_t *owner);
/// Set position of the owner thread.
virtual void requeue_position (int position);
/// Get position of the owner thread.
virtual int requeue_position (void);
/// Get the existing restart value.
virtual int restart (void);
/// Set a new value for restart and return the original value.
virtual int restart (int r);
// = Low-level wait_set mask manipulation methods.
/// GET/SET/ADD/CLR the dispatch mask "bit" bound with the
/// <event_handler> and <mask>.
virtual int mask_ops (ACE_Event_Handler *event_handler,
ACE_Reactor_Mask mask,
int ops);
/// GET/SET/ADD/CLR the dispatch MASK "bit" bound with the <handle>
/// and <mask>.
virtual int mask_ops (ACE_HANDLE handle,
ACE_Reactor_Mask mask,
int ops);
// = Low-level ready_set mask manipulation methods.
/// GET/SET/ADD/CLR the ready "bit" bound with the <event_handler>
/// and <mask>.
virtual int ready_ops (ACE_Event_Handler *event_handler,
ACE_Reactor_Mask mask,
int ops);
/// GET/SET/ADD/CLR the ready "bit" bound with the <handle> and <mask>.
virtual int ready_ops (ACE_HANDLE handle,
ACE_Reactor_Mask mask,
int ops);
/// Get the implementation class
virtual ACE_Reactor_Impl *implementation (void) const;
/**
* Returns 0, if the size of the current message has been put in
* <size> returns -1, if not. ACE_HANDLE allows the reactor to
* check if the caller is valid. Used for CLASSIX Reactor
* implementation.
*/
virtual int current_info (ACE_HANDLE handle,
size_t &msg_size);
/// Return 1 if we any event associations were made by the reactor
/// for the handles that it waits on, 0 otherwise.
virtual int uses_event_associations (void);
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
/// Dump the state of the object.
void dump (void) const;
protected:
/// Set the implementation class.
virtual void implementation (ACE_Reactor_Impl *implementation);
/// Delegation/implementation class that all methods will be
/// forwarded to.
ACE_Reactor_Impl *implementation_;
/// Flag used to indicate whether we are responsible for cleaning up
/// the implementation instance
int delete_implementation_;
/// Pointer to a process-wide <ACE_Reactor> singleton.
static ACE_Reactor *reactor_;
/// Must delete the <reactor_> singleton if non-0.
static int delete_reactor_;
/// Deny access since member-wise won't work...
ACE_Reactor (const ACE_Reactor &);
ACE_Reactor &operator = (const ACE_Reactor &);
};
#if defined (__ACE_INLINE__)
#include "ace/Reactor.i"
#endif /* __ACE_INLINE__ */
#include "ace/post.h"
#endif /* ACE_REACTOR_H */
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