[dba-VB] Thread safe list

Hi John --

I do use a dedicated static object instance to lock shared lists,
dictionaries, ... 

(obviously psuedocode)

	Dictionary<> Dict;
private static object _dictLocker = new object();

public void AddObjToList(obj)
{
	lock(_dictLocker)
	{
		Dict.Add();
	}
}
private GetObjFromList()
{
	lock(_dictLocker)
	{
		Obj = Dict[0];
	}

	Continue processing Obj here...
}


Thank you.

--
Shamil
 
-----Original Message-----
From: dba-vb-bounces at databaseadvisors.com
[mailto:dba-vb-bounces at databaseadvisors.com] On Behalf Of jwcolby
Sent: 3 ??????? 2010 ?. 16:15
To: VBA
Subject: [dba-VB] Thread safe list

I am using two threads in a part of my application.  One places objects onto
a list for processing. 
  Another gets pointers to objects on the list for processing, and later
removes those objects from the list when processing is complete.

 From my reading, this has to be synchronized with locking of some sort
since a simultaneous write by one thread while reading by the other will
cause corruption of some sort.

I have found discussions about how it is necessary to do so but no clear
example of two different methods actually locking / unlocking the collection
object.

In my class I have a class global dictionary object.

I have one (public) method called from outside of the class to place an
object onto the list.  I have another (private) method called by the class
to get an object on the list and use it.

Can I simply wrap the actual object with a lock in each method?

(obviously psuedocode)

	Dictionary<> Dict;

public void AddObjToList(obj)
{
	lock(Dict)
	{
		Dict.Add();
	}
}
private GetObjFromList()
{
	lock(Dict)
	{
		Obj = Dict[0];
	}

	Continue processing Obj here...
}


Will something this simple actually work?  Can someone provide simple
psuedocode that shows how to do this?


-- 
John W. Colby
www.ColbyConsulting.com
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