Adds an element to the front of a queue.
Queues typically use a first-in-first-out flow where data is enqueued at the back of the queue and dequeued in the front of the queue. In rare situations, you might want to interrupt this normal flow of data by adding an element to the front of the queue. For example, you may want to use the queue as a stack structure or add high-priority elements to the front of the queue. After you add an element to the front of a queue, the next Dequeue Element node you call removes and returns that element.
If the queue becomes invalid because the queue reference is released, then this node stops waiting and returns an error.
Use Dequeue Element to remove and return the element after you enqueue it.
A reference to a queue.
The element you want to add to the front of the queue. The data type of this input changes to match the data type of the elements in the queue.
The number of milliseconds that the node waits for available space in the queue if the queue is full.
Default: -1 — The node never times out.
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.
Default: No error
Reference to the queue.
A Boolean value that indicates whether there is space available in the queue before the node times out or an error occurs.
True | There was no space available in the queue before the node timed out, or this node generated an error. |
False | There was space available in the queue before the node timed out, or an error occurred before this node executed. |
The node produces this output according to standard error behavior.
This node can return the following error codes.
1122 | The reference became invalid while the node was waiting for it. |
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.
Where This Node Can Run:
Desktop OS: Windows
FPGA: Not supported
Web Server: Supported in VIs that run in a web application