This example shows how a Shared Variable block works in different Tasks.

Introduction

The Shared Variable block works as virtual connection between blocks. These blocks can be in different tasks like a Global Variable. Nevertheless, the Shared Variable value is only updated in one task at a time.

A Shared Variable do not change its value during a task execution, only at the end

. As an example, consider the diagrams below.

Simulation

In this example, Task 0 runs at 1Hz and Task 1 at 2Hz. Task 1 has a higher priority (because it runs at a higher rate) and gets executed first. In Figure 3, there is the Simulation Information Tab from

QFIRE Studio

. The blue squares mean Task 1 being executed and the orange ones mean Task 0 being executed.

This scheduled execution using the same Shared Variable created the signal plotted in Figure 4. In this signal, it is possible to see both of the diagrams incrementing the signal.