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uC-OS-III Features with Longer Critical Sections

uC-OS-III Features with Longer Critical Sections

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Last updated: Jan 12, 2021 by WES Admin

The table below shows several µC/OS-III features that have potentially longer critical sections. Knowledge of these will help the user decide whether to direct µC/OS-III to use one critical section over another.

Table - Reducing interrupt disable time
FeatureReason
Multiple tasks at the same priority

Although this is an important feature of µC/OS-III, multiple tasks at the same priority create longer critical sections. However, if there are only a few tasks at the same priority, interrupt latency would be relatively small.


Event Flags

See Synchronization		If multiple tasks are waiting on different events, going through all of the tasks waiting for events requires a fair amount of processing time, which means longer critical sections.

If only a few tasks (approximately one to five) are waiting on an event flag group, the critical section would be short enough to use the interrupt disable method.
Broadcast on Post calls

See OSSemPost() and OSQPost() descriptions µC/OS-III API Reference.		µC/OS-III disables interrupts while processing a post to multiple tasks in a broadcast.




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