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FreeRTOS Support ArchiveThe FreeRTOS support forum is used to obtain active support directly from Real Time Engineers Ltd. In return for using our top quality software and services for free, we request you play fair and do your bit to help others too! Sign up to receive notifications of new support topics then help where you can.
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Is uxTaskGetStackHighWaterMark() preemptible?Posted by alessandro1963 on June 30, 2015 Hello everybody, I have a low-priority task that periodically checks the other tasks' stack usage by means of uxTaskGetStackHighWaterMark(). Is this function preemptible by the FreeRTOS scheduler? In other words, can the higher priority tasks run without having to wait for uxTaskGetStackHighWaterMark() to complete (causing a kind of priority inversion situation)? I checked the code and I didn't see any ENTERCRITICAL ... EXITCRITICAL sections, so I assume that uxTaskGetStackHighWaterMark() can be preempted by the scheduler, but I just want to make sure. Thank you Alex Is uxTaskGetStackHighWaterMark() preemptible?Posted by rtel on June 30, 2015 I've just looked at the code and cannot see any reason why the functionality is not thread safe - so yes the functions can be pre-empted by higher priority tasks but that should not cause you a problem. Regards. Is uxTaskGetStackHighWaterMark() preemptible?Posted by alessandro1963 on June 30, 2015 Thank you very much for your quick reply. Best Regards
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NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.
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