xiaoxiang781216 commented on issue #1804:
URL:
https://github.com/apache/incubator-nuttx/issues/1804#issuecomment-693523363
Regressed by:
```
commit e24f2814015c6dcd9fc67edcd399ccbaf41c3669
Author: Gregory Nutt <gn...@nuttx.org>
Date: Sun Nov 20 07:57:18 2016 -0600
This commit adds a new internal interfaces and fixes a problem with
three APIs in the SMP configuration. The new internal interface is sched_cpu_p
ause(tcb). This function will pause a CPU if the task associated with 'tcb'
is running on that CPU. This allows a different CPU to modify that OS dat
a stuctures associated with the CPU. When the other CPU is resumed, those
modifications can safely take place.
The three fixes are to handle cases in the SMP configuration where one
CPU does need to make modifications to TCB and data structures on a task tha
t could be running running on another CPU. Those three cases are
task_delete(), task_restart(), and execution of signal handles. In all three
cases t
he solutions is basically the same: (1) Call sched_cpu_pause(tcb) to pause
the CPU on which the task is running, (2) perform the necessary operations,
then (3) call up_cpu_resume() to restart the paused CPU.
```
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