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Use the Synchronization VIs and functions to synchronize tasks executing in parallel and to pass data between parallel tasks.

Palette Object	Description
First Call?	Indicates that a subVI or section of a block diagram is running for the first time. The First Call? function returns TRUE only the first time you call it after you click the Run button.

Subpalette	Description
Notifier Operations Functions	Use the Notifier Operations functions to suspend the execution of a block diagram until you receive data from another section of the block diagram or from another VI running in the same application instance.
Occurrences Functions	Use the Occurrences functions to control separate, synchronous activities.
Queue Operations Functions	Use the Queue Operations functions to create a queue for communicating data between sections of a block diagram or from another VI.
Rendezvous VIs	Use the Rendezvous VIs to synchronize two or more separate, parallel tasks at specific points of execution. Each task that reaches the rendezvous waits until the specified number of tasks are waiting, at which point all tasks proceed with execution.
Semaphore VIs	Use the Semaphore VIs to limit the number of tasks that can simultaneously operate on a shared (protected) resource. A protected resource or critical section of code might include writing to global variables or communicating with external instruments.