v01d opened a new issue #3343:
URL: https://github.com/apache/incubator-nuttx/issues/3343
```
Description: The OS API sched_lock() disables pre-emption and locks a
task in place. In the single CPU case, it is also often
used to enforce a simple critical section since not other
task can run while pre-emption is locked.
This, however, does not generalize to the SMP case. In the
SMP case, there are multiple tasks running on multiple CPUs.
The basic behavior is still correct: The task that has
locked pre-emption will not be suspended. However, there
is no longer any protection for use as a critical section:
tasks running on other CPUs may still execute that
unprotected code region.
The solution is to replace the use of sched_lock() with
stronger protection such as spin_lock_irqsave().
Status: Open
Priority: Medium for SMP system. Not critical to single CPU systems.
NOTE: There are no known bugs from this potential problem.
```
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
