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Release Queue (G Dataflow)

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Last Modified: June 25, 2019

Releases a reference to a queue.

Programming Patterns

Transferring Data Between Loops Using Queue Nodes

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queue

A reference to a queue.

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force destroy

A Boolean value that determines whether to release all references to the queue.

Releasing all references to a queue destroys the queue, which deletes any elements in the queue and invalidates all references to the queue.
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Note

You can also destroy a queue by stopping all VIs that use the queue reference.

True The node releases all references to the queue.
False The node only releases the specified reference to the queue. This does not destroy the queue unless a reference to the queue has only been obtained once.

Default: False

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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queue name

The name of the queue, if the queue is named.

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remaining elements

The array of elements that were in the queue before the node released the queue.

The first element in the array is the element from the front of the queue, and the last element in the array is the element from the back of the queue.

The data type of the array elements changes to match the data type of the queue elements.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Releasing Multiple References to the Same Queue

If you obtain a reference to the same queue multiple times, you can release multiple references to that queue by calling Release Queue up to the same number of times that you obtained the reference. Releasing all references to a queue destroys the queue and deletes any elements in the queue.

If you are not using a loop to release references as they are obtained or otherwise keeping track of the number of times you obtain a reference, you can also destroy a queue with a single Release Queue node using force destroy?.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Supported in VIs that run in a web application

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