Online Forums
Technical support is provided through Support Forums below. Anybody can view them; you need to Register/Login to our site (see links in upper right corner) in order to Post questions. You do not have to be a licensed user of our product.
Please read Rules for forum posts before reporting your issue or asking a question. OPC Labs team is actively monitoring the forums, and replies as soon as possible. Various technical information can also be found in our Knowledge Base. For your convenience, we have also assembled a Frequently Asked Questions page.
Do not use the Contact page for technical issues.
Synchronization threads in subscription in live mapping
19 Feb 2015 12:23 #2811
by support
Replied by support on topic Synchronization threads in subscription in live mapping
If it's working, then it is probably right 
I haven't even expected it to be that simple.
The base implementations (in SynchronizationContext class) look like this:
I think that you should therefore use directly the delegate for your Post(...), because the original implementation can basically "get around" your lock by running the delegate from a thread pool thread - at any time, and without you being able to protect against it.
I haven't even expected it to be that simple.The base implementations (in SynchronizationContext class) look like this:
public virtual void Send(SendOrPostCallback d, Object state)
{
d(state);
}
public virtual void Post(SendOrPostCallback d, Object state)
{
ThreadPool.QueueUserWorkItem(new WaitCallback(d), state);
} I think that you should therefore use directly the delegate for your Post(...), because the original implementation can basically "get around" your lock by running the delegate from a thread pool thread - at any time, and without you being able to protect against it.
Please Log in or Create an account to join the conversation.
18 Feb 2015 23:07 #2806
by miron
Replied by miron on topic Synchronization threads in subscription in live mapping
Could you check my implementation:
Remarks
1. I have used default synchronization context to derive main functionality:
QuickOPCSyncContext : SynchronizationContext
I hope that is ok.
2. set up in main thread:
var synchContext = new QuickOPCSyncContext();
SynchronizationContext.SetSynchronizationContext(new QuickOPCSyncContext());
(Quick opc thread)
3. In logic loop I would like to use property
lock(synchContext.SynchObject )
{
}
4. Should execute base method:
base.Post(d,state);
or should I execute "d" delegate
d(,state);
I have made small test and it's look that is working.
But I would like take knowledge in the origin.
Thank you, and qood night.
I am waiting for quick answer.
public class QuickOPCSyncContext : SynchronizationContext
{
public object SynchObject {get;set;} //tu use construction with lock
public QuickOPCSyncContext()
{
SynchObject = new object();
}
public override void Post(SendOrPostCallback d, object state)
{
lock(SynchObject)
{
base.Post(d,state);
//or just execute d(,state);
}
}
public override void Send(SendOrPostCallback d, object state)
{
lock(SynchObject)
{
base.Send(d,state);
//or just execute d(,state);
}
}
};
Remarks
1. I have used default synchronization context to derive main functionality:
QuickOPCSyncContext : SynchronizationContext
I hope that is ok.
2. set up in main thread:
var synchContext = new QuickOPCSyncContext();
SynchronizationContext.SetSynchronizationContext(new QuickOPCSyncContext());
(Quick opc thread)
3. In logic loop I would like to use property
lock(synchContext.SynchObject )
{
}
4. Should execute base method:
base.Post(d,state);
or should I execute "d" delegate
d(,state);
I have made small test and it's look that is working.
But I would like take knowledge in the origin
.Thank you, and qood night.
I am waiting for quick answer.
Please Log in or Create an account to join the conversation.
Moderators: support
Time to create page: 0.084 seconds