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Waiting for multiple events without polling


Waiting for multiple events without polling

By : macUF
Date : November 24 2020, 05:44 AM
it should still fix some issue See the select() system call.
This is especially useful for waiting for multiple file channels.
code :


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Waiting on multiple events C++

Waiting on multiple events C++


By : PMG
Date : March 29 2020, 07:55 AM
wish helps you You can listen on multiple file descriptors without using multiple threads using the select(2) system call. You can use pthread_cond_timedwait to wait on a condition variable with a timeout, such that you don't wait more than a particular amount of time.
I think it's highly unusual to want to simultaneously wait on either a condition variable or a file descriptor of some sort -- if you're absolutely sure that that's what you want to do, you'll have to use multiple threads, with one thread calling either pthread_cond_wait/pthread_cond_timedwait, and the other thread calling select or some other I/O function.
Waiting for multiple Events

Waiting for multiple Events


By : PDiddy
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I'm currently developing an app mainly for self-education purposes and since I'm still not completely used to js I could use some help for my problem: , Try this,
code :
document.addEventListener("DOMContentLoaded",execute_this,false);
function execute_this(){
document.addEventListener("deviceready", execure_sth, false);
}
function execute_sth(){
//your code here
}
jQuery Waiting for Multiple Events to fire

jQuery Waiting for Multiple Events to fire


By : Quốc Toàn Nguyễn
Date : March 29 2020, 07:55 AM
it helps some times Is it possible to "wait" for multiple events before executing a function? I know its possible with jQuery deferred obejcts to use $.when to wait for two promises to resolve but I wondered if its possible with just plain old events? , You could use deferred, you just have to create them yourself.
code :
var clickDfd = $.Deferred();
var eventDfd = $.Deferred();
$("div").on("click", function(e) {
   clickDfd.resolve();
});

$("div").on("some-event", function(e) {
   eventDfd.resolve();
});

$.when(clickDfd, eventDfd).done(function(){ 
    alert("yay"); 
});
Waiting on multiple different pulses events

Waiting on multiple different pulses events


By : Ahmed Fathy
Date : March 29 2020, 07:55 AM
wish helps you If you are willing to do a little refactoring I would recommend switching from Monitor to one of the EventWaitHandle derived classes.
Depending on the behavior you want you may want AutoResetEvent, that will more closely act like a Monitor.Entier(obj)/Monitor.Exit(obj)
code :
private readonly object _lockobj = new Object();
public void LockResource()
{
    Monitor.Enter(_lockobj);
}

public void FreeResource()
{
    Monitor.Exit(_lockobj);
}

//Which is the same as

private readonly AutoResetEvent _lockobj = new AutoResetEvent(true);
public void LockResource()
{
    _lockobj.WaitOne();
}

public void FreeResource()
{
    _lockobj.Set();
}
private readonly object _lockobj = new Object();
public void LockResource()
{
    Monitor.Enter(_lockobj);
}

public bool WaitForResource()
{
    //requires to be inside of a lock.
    //returns true if it is the lock holder.
    return Monitor.Wait(_lockobj);        
}

public void SignalAll()
{
    Monitor.PulseAll(_lockobj);   
}

// Is very close to

private readonly ManualResetEvent _lockobj = new ManualResetEvent(true);
public bool LockResource()
{
    //Returns true if it was able to perform the lock.
    return _lockobj.Reset();
}

public void WaitForResource()
{
    //Does not require to be in a lock. 
    //if the _lockobj is in the signaled state this call does not block.
    _lockobj.WaitOne();      
}

public void SignalAll()
{
    _lockobj.Set();
}
ManualResetEvent resetEvent0 = ...
ManualResetEvent resetEvent1 = ...

public int WaitForEvent()
{
    int i = WaitHandle.WaitAny(new WaitHandle[] {resetEvent0, resetEvent1});
    return i;
}
Best practice for waiting for events on multiple threads in Linux (like WaitForMultipleObjects)

Best practice for waiting for events on multiple threads in Linux (like WaitForMultipleObjects)


By : user3055638
Date : December 21 2020, 05:24 PM
I wish this helpful for you epoll() is the correct solution, although you could consider using eventfd() file descriptors rather than pipe() file descriptors for the event signalling. See this text from the epoll(7) man page:
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