[anchao]

Summary

Optimize nxevent_post() by skipping waiter wakeup processing when the event
wait list is empty.

The posted event bits are still updated first, so future waiters can observe
the posted event state as before. If there are no tasks currently waiting on
the event object, the function now returns immediately instead of preparing
post-processing state and iterating over an empty wait list.

This avoids unnecessary work in the common case where events are posted before
any task is waiting for them.

Impact

No user-visible behavior change is expected.

Expected impact:

• reduces overhead when posting events with no current waiters
• preserves existing event state semantics for future waiters
• does not change wakeup behavior when waiters are present
• no API, ABI, build-system, documentation, or security impact is expected

Testing

sim/nsh

[github-actions]

MemBrowse Memory Report · Explore what changed →

No memory changes detected for:

• arduino-mega2560
• esp32-devkitc
• hifive1-revb
• mirtoo
• qemu-armv8a
• qemu-intel64
• rx65n-rsk2mb
• s698pm-dkit
• stm32-nucleo-f103rb

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