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Online Training Session: Messages for Intertask Communication
| How does a Task Receive a Message? |
| 1. Define Content and Structure of the Message • Make Sure Sender and Receiver Tasks have Same Definition 2. Ask to Receive a Message • Task may need to Wait (in “Blocked” state) for Message to Arrive 3. If / When Message is Received, Process Appropriately 4. Free the Message Buffer • … if the Message was in RTOS-allocated Memory 5. (Optionally) Loop back and Ask for Another Message |
| NOTES: This is a 5-step "cookbook" for what to do to program a task to receive a message. The details are slightly different for different off-the-shelf RTOSs and RTOS categories. 1. Define Content and Structure of the Message • Make Sure Sender and Receiver Tasks have Same Definition 2. Ask to Receive a Message, taking into account that the task may need to Wait (in “Blocked” or "Waiting" or "Pended" state) for a Message to Arrive 3. If / When Message is Received, Process Appropriately 4. Free the Message Buffer … if the Message was in RTOS-allocated Memory 5. (Optionally) Loop back and Ask for Another Message |
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