anchao opened a new pull request, #17200:
URL: https://github.com/apache/nuttx/pull/17200
## Summary
sched/sleep: add support for scheduling sleep
Nuttx currently has 2 types of sleep interfaces:
1. Signal-scheduled sleep: nxsig_sleep() / nxsig_usleep() / nxsig_nanosleep()
Weaknesses:
a. Signal-dependent: The signal-scheduled sleep method is bound to the
signal framework, while some driver sleep operations do not depend on signals.
b. Timespec conversion: Signal-scheduled sleep involves timespec
conversion, which has a significant impact on performance.
2. Busy sleep: up_mdelay() / up_udelay()
Weaknesses:
a. Does not actively trigger scheduling, occupy the CPU loading.
3. New interfaces: Scheduled sleep: nxsched_sleep() / nxsched_usleep() /
nxsched_msleep() / nxsched_ticksleep()
Strengths:
a. Does not depend on the signal framework.
b. Tick-based, without additional computational overhead.
Currently, the Nuttx driver framework extensively uses nxsig_* interfaces.
However, the driver does not need to rely on signals or timespec conversion.
Therefore, a new set of APIs is added to reduce dependencies on other
modules.
(This PR also aims to make signals optional, further reducing the code size
of Nuttx.)
Signed-off-by: chao an <[email protected]>
## Impact
N/A
## Testing
new api test on sim/nsh, sabre-6quad/smp:
nxsched_sleep() / nxsched_usleep() / nxsched_msleep() / nxsched_ticksleep()
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