A utility function is often created with one simple goal: Write the code once and reuse it everywhere. For example: convert_temperature(); calculate_crc(); send_message(); update_statistics(); This works well in a simple program. But an RTOS system is different. Multiple tasks may call the same function. For example: Sensor Task ↓ Shared Utility Function ↑ Communication Task ↑ Control Task If the utility function uses shared data internally, the tasks can interfere with each other. The function may work correctly when only one task calls it. But it may fail when two tasks call it at almost the same time. This article explains how to make shared utility functions safer for RTOS-based embedded systems . Quick Answer A shared utility function is safest when it: Uses local variables where possible Receives input through parameters Returns results directly Avoids hidden global s...
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