What Is a Notifier?Primary Software: Primary Software Version: 7.1 Primary Software Fixed Version: N/A Secondary Software: LabVIEW Development Systems>>LabVIEW Base Development System, LabVIEW Development Systems>>LabVIEW Professional Development System
Problem: What is a notifier? Solution: Notifiers are a tool for communicating between two independent parts of a block diagram or between two VIs running on the same machine. Notifiers cannot communicate across networks or the VI Server. This communication is generally for the purpose of synchronizing two independent processes.  Figure 1: The VIs on the Notifier Palette (Programming»Synchronization»Notifier Operations)
Notifiers are similar to mailboxes for data: one process sends data to the mailbox and another process receives data from the mailbox. In this way they are similar to local or global variables. When using a variable, however, the process that is waiting for information must cycle continuously to check the value of the variable. One benefit of notifiers is that the process that receives information completely stops execution while waiting, and starts again only when new data becomes available. This cuts down on computer time wasted on endless polling. Look for example programs in the LabVIEW shipping examples. Open LabVIEW » Help » Find Examples. Search for notifier on the Search Tab. Related Links: KnowledgeBase DIRECT-3S8RDE: What Is a Queue? KnowledgeBase DIRECT-3S8REX: What Is a Rendezvous? KnowledgeBase DIRECT-3S8RDV: What Is a Semaphore? Example: Notification with 3 Parallel SubVIs Attachments:
Report Date: 03/03/1998 Last Updated: 08/26/2016 Document ID: DIRECT-3S8RCH |
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