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Topic: Event queue

  
 Event-driven programming - Wikipedia, the free encyclopedia
Operating systems also typically act as dispatchers for software processes, passing data and software interrupts to user processes that in many cases are programmed as event handlers themselves.
Programming an event driven system is thus a matter of rewriting the default trigger functions of the system, to match the required behavior.
Inputs can be polled in the event loop, or interrupt handlers can be registered to react to hardware events; many systems use a mixture of both techniques.
http://en.wikipedia.org/wiki/Event-driven_programming   (527 words)

  
 Drawbacks of the Global Event Queue
Because each event in the queue contains a reference to the component to be simulated, it becomes very difficult to represent circuits hierarchically without compromising the autonomy of the low-level subcomponents of a component.
This may involve changing the concept of an event at the uppermost level of the simulation; instead of containing references to components and signals, events would instead contain references to other event queues.
For example, if the synchronizing process was running on a separate machine, then that machine would undoubtedly act as a bottleneck during the course of the simulation since every other distribution node partaking in the simulation would have to communicate with it.
http://www.cs.mun.ca/~donald/msc/node59.html   (753 words)

  
 CS333 Lab A-3: Distributed Discrete Event Simulation
So, the idea of a discrete event simulation is to compute, as quickly as possible, the physical times that "would" occur in real time in a physical system, but without actually waiting for the delays between events to occur in real time.
The purpose of a discrete event simulation is to study a complex system by computing the times that would be associated with real events in a real-life situation.
When simulations grow large and have a lot of concurrency (have many events that could be processed simultaneously), it can be helpful to distribute the work of processing events across many simulators, with each simulator responsible for processing certain kinds of events.
http://www.cs.wustl.edu/~kjg/cs333/devs.html   (2033 words)

  
 [No title]
When digits are directed to the event queue, rather than the digit queue, the digits received will no longer terminate multitasking functions in the normal manner.
It is important to process events quickly so that the application program remains responsive to user input.
This is useful for including program events and system events in a state machine.
http://resource.intel.com/telecom/support/releases/dos/voicebrick/api/api-05.htm   (599 words)

  
 Citations: An Empirical Comparison of Priority--Queue and Event--Set Implementations - Jones (ResearchIndex)
Not least because we need the same code for the insertion buffer, binary heaps were coded perhaps even more carefully than the remaining components binary heaps are the only part of the code for which we took care that the assembler code contains no unnecessary memory accesses, redundant....
For search trees, B trees are the standard way to implement trees optimized for the....
http://citeseer.ist.psu.edu/context/172032/0   (2315 words)

  
 The Global Event Queue
Even though many simulators are built based upon the concept of a global event queue [3],[10], [16]; there are some fundamental problems associated with these data structures and, in particular, how they are implemented using structured programming languages.
The traditional approach to simulating parallel devices is to treat all components as being at the same time with respect to a so-called global event queue [9].
It will be shown in the next section that the use of distributed event queues in the form of wires makes for a more intuitive approach to hardware simulation.
http://www.cs.mun.ca/~donald/bsc/node33.html   (506 words)

  
 Mainframe Week Issue 7, 20 February 2002. An event queue monitor for OS/390
Queue depth events are not handled, though this may easily be added.
Add the event reason code and the handler function name to the events table:
In such an environment, it's no trivial task to guarantee the availability of each queue manager and the channels that connect them.
http://www.mainframeweek.com/journals/articles/0007/81   (1044 words)

  
 Event queue - Wikipedia, the free encyclopedia
An event queue is a software queue that is used to process a sequence of inputs, typically from the user.
A WIMP environment such as Windows, stores user-generated events in an event queue by some form of prioritization (usually time of event or order of importance).
Each record in the queue contains data detailing the event, including the time of occurrence, the type of input device, and the specific input parameters.
http://en.wikipedia.org/wiki/Event_queue   (111 words)

  
 SDL Library: Event Function Reference
Pumps the event loop, gathering events from the input devices.
This function updates the event queue and internal input device state.
, it will be generated whenever unhandled events are received from the window manager.
http://www.math.psu.edu/local_doc/SDL-1.1.2/events/functions.html   (828 words)

  
 The Caml Development Kit - Libraries equeue equeue Modules Unixqueue
The "operation" specifies what kind of events can happen with a file descriptor; it is possible to put the same descriptor several times into the event_system if the operations differ.
What can happen is that there is something to do for a file descriptor (reading, writing, accepting out-of-band data) or for a certain period of time ("timeout") nothing has happened.
As a special case, the operation "Wait" does nothing except generating timeout events.
http://pauillac.inria.fr/cdk/newdoc/htmlman/cdk_178.html   (1129 words)

  
 [No title]
Application 2: Computing Line Segment Intersections ---------------------------------------------------- This application (which is not from Weiss) demonstrates why an event queue might be keyed on some quantitative property other than time, and why several data structures might be combined together to accomplish a complex task.
Fortunately, you can define the comparison functions so that they consider BOTTOM events at a given y-coordinate to be less than TOP events with the same y-coordinate.
Fortunately, when we insert a segment into the search tree, we can easily compute the key for each segment we compare it with on the fly as we walk down the search tree.
http://www.cs.berkeley.edu/~jrs/61bf98/lectures/27/README   (2210 words)

  
 [No title]
The back index specifies the index into the array, where the next event will be stored.
/***************************************************************************** * IAR visualSTATE Static Event Handler Source File (sample code) * * The file implements an event queue with a static size, specified by the * value of the macro EVENT_QUEUE_SIZE.
See the associated header file * for descriptions and use of those functions.
http://www.cs.uit.no/~olepw/MiniMIPS/source/c-source/simpleEventHandler.c   (510 words)

  
 Embedded system
One major weakness of this system is that it does not guarantee a time to respond to any particular hardware event.
The advantages and disadvantages are very similar to the control loop, except that adding new software is easier.
Developers should insist on debugging which shows the high-level language, with breakpoints and single-stepping, because these features are widely available.
http://www.sciencedaily.com/encyclopedia/embedded_system   (2886 words)

  
 iB::Topic::Ideas on an Event Queue
Basically, the mud needs to sleep until it is time to dispatch the next task, or it is interrupted by some occurrance like player input.
Determining the which task is next is easy with a priority queue.
I think you should be more worried about how clearly the datastructure fits the task than how performant it is until you've profiled and determined that it's a bottleneck.
http://www.topmudsites.com/cgi-bin/ikonboard/ikonboard.cgi?act=ST&f=3&t=203   (1626 words)

  
 IBM MQSeries : Library : Manuals
An event queue may be unavailable for many different reasons including:
For an overview of event message formats, see "Format of event messages".
For example, a queue depth limit has been reached.
http://www-306.ibm.com/software/integration/mqfamily/library/manuals99/csqzai/csqzai0h.htm   (1186 words)

  
 Fast Events in SDL
It locks out all of the SDL input events that are generated through
In either case you have to keep looking at the problem until the estimated results match the measured results.
A semaphore is a simple mutual exclusion operator also known as a mutex.
http://gameprogrammer.com/fastevents/fastevents1.html   (1956 words)

  
 Kannel Architecture and Design
Events related PAP protocol correspond attributes of XML document.There are minor differences due to implementation details, but it has been a goal to make the implementation follow the specification as closely as possible to reduce errors.
The queue operations are very fast (constant time), so the time spent waiting for a lock is short.
What Kannel needs to do, then, is read requests from each external interface as fast as possible, and keep them in an internal queue.
http://www.kannel.org/download/1.2.1/arch-1.2.1/arch.html   (12899 words)

  
 Feb 90 Letters
The solution is to change the event to a null event rather than dequeuing it.
The result is usually a bus error because the qLink field of the last event contains a -1.
The third takes a unique approach by setting the event type to null rather than removing the event.
http://www.mactech.com:16080/articles/mactech/Vol.06/06.02/Feb90Letters   (1812 words)

  
 Re: Multithreaded Event Queue Followup
on poll with NULL timeout, obtain a queue mutex, check queue > for contents, release mutex, enter select() with special file > descriptor in the select set; > > on eventSend, obtain mutex, insert event, release mutex, write a byte > on the socket file descriptor.
To solve it, > there are 2 options which should work equally well, and I leave it to > the implementor's sense of taste: > > #1: > make local socket file descriptor inside the library for each > queue.
emPtrButtonRelease); > ggi_event *event = new ggi_event; > ggiEventPoll(visual, mask, NULL); > ggiEventRead(visual, event, mask); Just FYI - ggiEventRead() will block until there is a suitable event available, so the ggiEventPoll() is not necessary in the above code.
http://www.ggi-project.org/mailinglist/apr99/177.html   (510 words)

  
 [No title]
Figure 8: Graphs of time per event vs N for 4 different jump distributions Conclusion We have demonstrated that the cache has an effect on the performance of the static calendar queue, and that the current model is not entirely accurate because it operates in a world where all memory accesses have the same cost.
As N increases, the time per event rises correspondingly as a result of an increased number of cache misses.
ATOM: A system for building customized program analysis tools.
http://www.cs.washington.edu/research/cachealg/calqueue.doc   (493 words)

  
 [No title]
In other words, up to simulated time 1000.0, the program simulated the arrival of 594 jobs, and their mean wait in the queue was 0.96.
The latter refers to the fact that Machine() had been waiting for a condition variable related to the machine queue being nonzero.
The debugging output will tell you a lot about the event list and the occurrence of events.
http://heather.cs.ucdavis.edu/~matloff/psim.html   (3162 words)

  
 Drain The Event Queue
James Bonfield proposed a C code patch in Nov. 2000 that would "fix" Tk's use of the native Windows open file dialog.
This is a Windows bug, not really a Tk bug, and it happens with applications other than Tk.
The basic problem is that the native Windows file open dialog only consumes 1.5 clicks, and after the dialog closes, the remaining event falls to whatever window is below.
http://wiki.tcl.tk/11284   (448 words)

  
 [No title]
with Events; with Window_Events; with Database_Events; with Network_Events; pragma Elaborate(Window_Events, Database_Events, Network_Events); package body Handler_Pkg is Central_Event_Queue : aliased Events.Event_Queue; -- The window, database, and network events will be -- redirected to this event queue.
-- It is erroneous to call this if the event object was -- not dynamically allocated.
entry Await_Event(Event : out Event_Ptr); -- Unlink first event object from event queue; -- Wait if there are none.
http://archive.adaic.com/standards/95lsn/LSN-1032.txt   (553 words)

  
 [No title]
// general framework: // // each queue directly manipulates (SHeap)g_event_queue to add their // events to it, where an event is always the event that they've just // finished serving someone.
curr_cus = heap->query_min(); next_expected_event = curr_time + curr_cus.service_time; event = set_event(QUEUE_EVENT, my_index_val(), next_expected_event); g_event_queue.insert(event, next_expected_event); last_called = curr_time; return; } int EDPQueue::snapshot(double *leadtimes, double curr_time, int *type1p, int *type2p) { const heap_t* all_cus; int ctr; int type1, type2; // if (n_customers_val() == 0) // warn_once("EDPQueue::snapshot(...) called with no customers."); assert(double_leq(curr_time, next_expected_event)
assert(is_int(heap->query_min_key())); curr_cus = heap->query_min(); next_expected_event = curr_time + curr_cus.service_time; event = set_event(QUEUE_EVENT, my_index_val(), next_expected_event); g_event_queue.insert(event, next_expected_event); last_called = curr_time; return; } int LIFOQueue::snapshot(double *leadtimes, double curr_time, int *type1p, int *type2p) { const heap_t* all_cus; int ctr; // if (n_customers_val() == 0) // warn_once("LIFOQueue::snapshot(...) called with no customers."); assert(double_leq(curr_time, next_expected_event)
http://www.gsia.cmu.edu/afs/stat/jpl/queue.C   (678 words)

  
 Simulation Using a Global Event Queue
This scheduling of events represents how signals are propagated within the circuit -- the global event queue is responsible for caching the outputs of a component and then feeding it to the corresponding fan-out components when the appropriate time node of the event queue has been reached during the simulation.
Figure 4.1: Digital Simulation Using a Global Event Queue
These events often consist of a pointer to the component which is to be simulated and an indication of what action the component must take.
http://www.cs.mun.ca/~donald/msc/node58.html   (284 words)

  
 EventQueue
If the current thread is not the event dispatch thread, this method returns null.
s have timestamps, but this may be added to other events in future versions.
The manner in which the event is dispatched depends upon the type of the event and the type of the event's source object.
http://www.docjar.com/docs/api/java/awt/EventQueue.html   (481 words)

  
 Natural Access Service Writer's Manual (6405-14): Alphabetical Function Reference
Unable to allocate memory for queue, driver or context.
) associated with the context referenced in the event.
DWORD value; /* Event status or event-specific data */
http://www.nmscommunications.com/manuals/6405-14/chap1014.htm   (214 words)

  
 Event queue (libevent) interface
The binary libevent API is already supported on SCO UnixWare 2.1.X systems; that is, an SCO OpenServer binary linked with a static version of libevent will run on SCO UnixWare 2.1.X systems.
For more information, see the manual pages for the libevent routines in Section 3event manual pages.
This port now allows developers to use the UDK to develop applications that use libevent interfaces; such programs will run on all three platforms.
http://docsrv.sco.com/SDK_porting/event_api_top.html   (154 words)

  
 Reading Events from the Event Queue
evnt_get() fills this structure with the values for the current event, if one is available.
However, because evnt_get() does not wait for user input, it does not call the keyloop function.
If the event type is not AC_KEYPRESS, you should probably pass the keyloop function a value of KL_WAIT and continue waiting for a keystroke; however, this may be dependent on your application.
http://www.vtsoft.com/VVHTMLHelp/VVUsersGd/htm/readingeventsfromtheeventqueue.htm   (452 words)

  
 [SDL] how to read mouse positon when event queue empty ?
The code is full of various event loops, sub-loops all = scattered..Whenever I need mouse position, I use different local = variables..thats why at many points in the code I don't have the = 'previous' value..And the code has just gotten complicated enough to = make mouse position variables global.
>=20 > JG >=20 > Meetul Kinarivala wrote: > >=20 > > How do I read current mouse cursor position *given* that all events = have > > been filtered out of the queue and *no* event has taken place=20 > since then ?
Previous message: [SDL] how to read mouse positon when event queue empty ?
http://www.libsdl.org/pipermail/sdl/2001-October/039132.html   (310 words)

  
 Section 5 - File Formats and Data Descriptions
(3) format, controls which event names match this subscription.
If the event name matches the value in
Enqueue a notification message to this reliable queue when a matching event is detected.
http://e-docs.bea.com/wle/tuxedo/refman/sect5/sect522.htm   (358 words)

  
 POE::Kernel - POE Event Queue and Resource Manager
``Expedite'' selects generate events when files have out-of-band information to be read.
Therefore session_create is depreciated starting with version 0.07.
This behavior is considered to be a bug, and there are plans to fix it.
http://wntweb2.ethz.ch/ActivePerl/site/lib/POE/Kernel.html   (2067 words)

  
 [No title]
We might also eventually want to * do more when the function is set.
*/ { int current; if (!SIN_Q_EMPTY(queue)) { --queue->count; current = queue->events[queue->last].next; queue->events[queue->last].next = queue->events[current].next; queue->events[queue->events[current].next].previous = queue->last; SIN_Q_PUSH_FREE_ELEMENT(queue, current); } } static void delete_event(queue, event_q_id) Sin_event_queue *queue; int event_q_id; /* Remove an event from a queue.
events[current].next; if (queue->events[current].event.wsid == wsid) { delete_event(queue, current); } current = next; } if (queue->overflow == SIN_Q_OVERFLOW_NOT_INQUIRED && queue->overflow_dev.ws == wsid) queue->overflow = SIN_Q_OVERFLOW_WS_FLUSHED; /* if (SIN_Q_EMPTY(queue)) SIN_Q_CLEAR_OVERFLOW(queue); */ } void phg_sin_q_flush_device(queue, wsid, class, num) Sin_event_queue *queue; Pint wsid; Pin_class class; Pint num; /* Flush all events on queue from a device.
http://www.x.org/pub/unsupported/lib/PHIGS/input/sin_q.c   (452 words)

  
 CIS307: HINTS FOR HOMEWORK 1
Discrete event simulation is used extensively when trying to predict or analyze the behavior of computer systems.
Say that G2 is the smaller of these two values [if the two values are equal one is chosen in some fashion].
Thus each system, application, and language has some means to generate random number.
http://www.cis.temple.edu/~ingargio/old/cis307s95/homeworks/hints1.html   (909 words)

  
 Event C++ Class Source Code for DirectX Game Library
static MyEventCallback myCB; // Creates the event object and queues it to expire in 2 seconds.
Event C++ Class Source Code for DirectX Game Library
Creates an unqueued CK_Event object, but sets the callback, expiration time, and callback parameter for when the event is queued.
http://www.chilkatsoft.com/ChilkatDx/ck_event.htm   (476 words)

  
 Generating Diagnostics by Monitoring the System Event Queue and Internationalizing Dates, Times, Months, and Days of ...
Much of the program is the same as for the first example.
Instead of capturing keystrokes, the program reports the amount of free memory in the Java virtual machine*.
Secondly, as with all event-handling operations, if the task you want to perform is not very quick, you should create a secondary thread to perform the operation.
http://java.sun.com/developer/JDCTechTips/2003/tt0624.html   (1995 words)

  
 File Index
All of the code is based on mi/mieq.c and was modified as little as possible to provide XInput event support (the copyright and some of the comments are from The Open Group, Keith Packard, MIT X Consortium).
This function is called from ProcessInputEvents() to remove events from the queue and process them.
This function adds an event to the end of the queue.
http://dmx.sourceforge.net/html/dmxeq_8c.html   (183 words)

  
 Working with the event queue
class represents a queue of events waiting to be processed.
However, most of the time you'll be more interested in the system event queue.
Oncee you have a reference to the system event queue, you can manipulate it with the following methods:
http://www.ibiblio.org/javafaq/course/week7/22.html   (125 words)

  
 getchar - Read character from event queue
The character will also be appended to the input string ``str'', if present.
If this event is a key event, getchar will return the ISO-Latin-1 value of the character.
getchar will read the first event in the event queue.
http://www.ifi.uio.no/~candlweb/spec/node67.html   (92 words)

  
 RE: [ISSForum] Event Collector Event Queue full
This information applies to: SiteProtector SP4 Fix Version: N/A Related Articles: See Below Answer The best options stop this error from occurring are to: - Upgrade to Service Pack 5.
If you do not wish to do either of these, it is also possible to disable the CAC component which is causing the errors.
The errors can appear in the Windows Application logs and as EventCollector_Error events with a message that states: (EventCollector_) - Central Response's Event Queue is full.
http://www.mail-archive.com/issforum@iss.net/msg07505.html   (578 words)

  
 Koders - event_queue.c
log_events, sizeof(EventNode), sort)) { FatalError("Failed to initialize Snort event queue.\n"); } return 0; } static int LogSnortEvents(void *event, void *user) { Packet *p; EventNode *en; OTNX *otnx; if(!
e2->rule_info) { /* ** incoming event is a rule, event in queue ** is not.
** ** Copyright (C) 2004, Daniel Roelker and Sourcefire, Inc. ** ** These functions wrap the sfeventq API and provide the priority ** functions for ordering incoming events.
http://www.koders.com/c/fid2E890FE995D4B75DA6E7CC7118ABEC02A3325D29.aspx   (381 words)

  
 locustworld: Check-in [18]
\n"); } @@ -112,128 +120,194 @@ will handle everything in the Event queue and then goto sleep.
We don't want to do are +rebroadcasting on an interupt so the queued packets +are rebroadcasted by a seperate thread which handles +it at a later date...
They are queued instead of -being acted on directly because a lot of the -events are recieved on interupts and you want -to limit the amount of work being done on -interupts!
http://www.locustworld.com/tracker/chngview?cn=18   (1796 words)

  
 The Event Queue
Your Java program will only see events that are sent to it by the native user interface.
The program removes events from the queue and processes them, one at a time.
Normally this takes place at the operating system level.
http://www.ibiblio.org/javafaq/course/week7/02.html   (159 words)

  
 [No title]
****************************************************/ int insert_event_queue_entry(int type,struct sk_buff *packet) { struct event_queue_entry *new_entry; struct interface_list_entry *tmp_interface; struct iphdr *ip; int start_point=sizeof(struct udphdr)+sizeof(struct iphdr); if ((new_entry = (struct event_queue_entry*)kmalloc(sizeof(struct event_queue_entry),GFP_ATOMIC)) == NULL) { printk(KERN_WARNING "AODV: Not enough memory to create Event Queue Entry\n"); return -ENOMEM; } new_entry->time = getcurrtime(); new_entry->type = type; new_entry->prev = NULL; if (type
MadHoc was written by - Fredrik Lilieblad, Oskar Mattsson, Petra Nylund, Dan Ouchterlony and Anders Roxenhag Mail: mad-hoc@flyinglinux.net This software is Open Source under the GNU General Public Licence.
dev is the device the event was recieved on.
http://www.cs.uccs.edu/~smanet/aodvsrc/event_queue.c   (254 words)

  
 Enterprise Server Version 5.0: Installation Guide : Event Queue
The server-side application is responsible for the implementation of the ConnEventListener interface as well as the processing of the events being pushed into the listener.
The EventQueueManager interface is used as a handle by the server-side implementation for the registration of event listeners.
A server can register listeners to the event queue based on event types that the server is interested and therefore can process those events when the server needs to do so.
http://info.borland.com/techpubs/books/bes/htmls/DevelopersGuide5/DevelopersGuide/event_queue.html   (673 words)

  
 Event Queues
event is triggered when a window is resized.
event is triggered under X when a window becomes visible.
Events can be associated with more than devices
http://medialab.di.unipi.it/web/IUM/Waterloo/node23.html   (179 words)

  
 3.10 Snort Multi-Event Logging (Event Queue)
This argument determines the way that the incoming events are ordered.
This determines the maximum size of the event queue.
The general configuration of the event queue is as follows:
http://www.snort.org/docs/snort_htmanuals/htmanual_2.4/node24.html   (239 words)

  
 Page load and event queue on .NET Newsgroups
My problem is that the page_load event runs a whole load of code that
> My problem is that the page_load event runs a whole load of code that
The page_load event occurs as usual with the the button
http://www.netnewsgroups.net/group/microsoft.public.dotnet.framework.aspnet/topic8460.aspx   (349 words)

  
 QWinEvent - Add a window event to the Tcl event queue
Tcl_QueuePosition position (in) Where to add the new event in the queue: TCL_QUEUE_TAIL, TCL_QUEUE_HEAD, or TCL_QUEUE_MARK.
This procedure places a window event on Tcl’s internal event queue for eventual servicing.
It creates a Tcl_Event structure, copies the event into that structure, and calls Tcl_QueueEvent to add the event to the queue.
http://techpubs.sgi.com/library/dynaweb_docs/linux/usr/share/catman/man3/QWinEvent.3.html   (129 words)

  
 [No title]
} */ boolean silica_event_queue_emptyP_main(descriptor_t *orig_sp, heapptr_t A0 /* queue */) { descriptor_t *cluster_0_top; descriptor_t L__deque; /* %deque */ boolean L_x; /* x */ L__deque = SLOT(A0, descriptor_t, 4); orig_sp[0] = L__deque; /* empty?
http://www.cs.cmu.edu/afs/cs.cmu.edu/project/gwydion-10/bfw-duim/duim-06-jun-96/silica/event-queue.c   (1366 words)

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