RTOS task preemption and non preemption related query

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Hi,

I have one query related to RTOS. We are using Nucleus RTOS. But my query is Generic. Suppose if a task is executing and if it's preemption is disabled, then is the task becoming atomic in nature? What i am asking here is, once the preemption of a task is disabled, can ISR routine interrupts interrupt the task? disabling the preemption of a task means, all other tasks cannot interrupt the particular task that is executing. so, can ISR in this situation can cause the interruption? and by disabling the preemption, is it a meaning of disabling the ISR aslo??

Posted 4-Dec-13 18:34pm

Vinod KUmar S N

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kesler.h · Answer 1 · 2014-05-23T15:43:00

ISR and RTOS are two things (ISR does not rely on RTOS but RTOS may rely on ISRs, like the Tick ISR). Disabling pre-emption does not at all mean that any ISR will not kick in. If you have enabled interrupts for other features, like SPI or I2C, for example, then any of such events can interrupt your thread execution.