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Synclock a part of a 2 dimensional array?

Hepen
Hepen asked
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Last Modified: 2010-04-23
How can I synclock a part of a 2 dimensional array?

Dim objThing(1000,1000) as String

Synclock objThing(800,800)

End Synclock

This way I can access only one part while the rest of the object can be accessed by other threads at the same time?

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Commented:
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Commented:
i tried but it wouldn't let me ... can u show me the code

Commented:
However, this doesn't prevent other thread from working with whole objThing array, like:
objThing = Nothing

If your code doesn't do this, it is OK.

Author

Commented:
Let me give u points for this question i'm gonna ask another one i made a small mistake.

Commented:
Oops, there is restriction:
You cannot change the value of lockobject while executing a SyncLock block. The mechanism requires that the lock object remain unchanged.

Since string is immutable object, this code will not work. This can work with other classes, with one additional restruction: lockobject cannot be Nothing. For example:

Dim objThing(1000,1000) as MyClass
' initialize all objThing members to New MyClass

Synclock objThing(800,800)
  ' ...
End Synclock

So, this way can be used with initialized array of mutable instances. In your case this will not work, you need to lock the whole array.

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