Interprocess Data Communication in Operating Systems
An embedded processor running an operating system can support multiple user mode processes within the same processor. In this case, processes typically communicate with each other using asynchronous software API calls to the operating system. For more information on interprocess data communication in operating systems, see the Wikipedia website Inter-process communication.
The SoC Blockset™ Interprocess Data Read, Interprocess Data Channel, and Interprocess Data Write blocks simulate communication between two processes managed by an operating system. To create a one-way data channel between two processes, add an Interprocess Data Write block into the first process reference model that sends data. Next, add an Interprocess Data Read block into the other process reference model that receives data. In each model, expose the event ports to the top-level model using the Outport and Inport blocks, respectively. Finally, connect the event ports in the top level model using the Interprocess Data Channel block.
Two Way Interprocess Communication
This example shows two-way interprocess data communication between two processors running in an operating system managed processor.
Process1 sends a data message, using the Interprocess Data Write block, to the Interprocess Data Channel block at a 0.01 second interval. Process2 two receives and processes the data messages asynchronously, using the Interprocess Data Read block. The processed data then returns to Process1 received by an asynchronous task.
Results
In the Simulation tab, click Run. When the simulation completes, open the Simulation Data Inspector to view the resulting signals and task executions. Process1 sends the data packet at the completion of Task11. Task21, in Process2, triggers upon receiving the event, processes the data packet, and send the packet back to Process1. Task12, in Process1, executes immediately upon receiving the data packet, preempting Task11. The result is a complete transfer of data packets to one process and receiving the completed result.
See Also
Interprocess Data Channel | Interprocess Data Read | Interprocess Data Write | Task Manager