RTE communication across tasks
Follow data from a producer runnable to a consumer without assuming they execute immediately or on the same core.
Ports and contracts
SWCs communicate through configured ports and interfaces. Sender-receiver communication carries data; client-server communication invokes operations. Generated RTE APIs reflect the selected interface and communication semantics.
Runnable execution
A runnable executes because its configured event is mapped into the system's execution model. Writing data does not imply that every consumer executes immediately. Timing events, data events and task mapping affect observation latency.
Cross-core data
Cross-core communication requires configured mechanisms with appropriate synchronization and consistency semantics. Implicit communication may provide a runnable-consistent snapshot, while explicit APIs access data at call points according to configuration. Read the generated code and configuration instead of assuming a plain global variable.
Follow each transition
Producer runnable
The producer computes a value.
Conceptual sequence. Timing is slowed for learning; it is not a hardware measurement.
Your investigation
A 5 ms producer feeds a 10 ms consumer. Why can the consumer legitimately skip intermediate values?
Reveal the investigation checklist
- Identify queued versus nonqueued semantics.
- Compare producer and consumer activation times.
- Trace RTE writes and reads with timestamps.
- Decide whether the requirement needs every sample or the latest value.
A nonqueued latest-value interface necessarily preserves every producer update. True?
Answer the knowledge check correctly to complete this lesson.
Think through RTE communication across tasks
Ask for an explanation, an automotive example or a question that tests your understanding.
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