Thank you Greg and Xiang Xiao,
In fact, I was citing threads, but all children were tasks created this way:
ret = task_create("child1_daemon", 100, 4096, child1_daemon, NULL);
I will change it to pthread and I think it will work with those
suggestions you guys gave me.
BR,
Alan
On 1/16/23, Xiang Xiao <xiaoxiang781...@gmail.com> wrote:
> If CONFIG_SIG_DEFAULT, the kernel will terminate all child pthreads, but
> not child tasks.
> We can extend kill to support -P flag like pkill:
> https://linux.die.net/man/1/pkill
> -P ppid,...
> Only match processes whose parent process ID is listed.
>
> On Mon, Jan 16, 2023 at 10:14 AM Gregory Nutt <spudan...@gmail.com> wrote:
>
>> he
>>
>> > Ooops. No, you a re asking about tasks, not threads. That is easier.
>> > The answer is no: One task exiting has not effect at all any other
>> tasks.
>> >
>>
>> The question is confusing because it asks about killing other threads
>> (aka
>> pthreads) when the main (task) exits. But the example shows only tasks
>> (main threads).
>>
>> https://cwiki.apache.org/confluence/display/NUTTX/Tasks+vs.+Threads+FAQ
>>
>>
>> >
>> >> On Sun, Jan 15, 2023 at 5:25 PM Alan C. Assis <acas...@gmail.com>
>> wrote:
>> >>
>> >>> Dear NuttXers,
>> >>>
>> >>> I want to know if there are some hidden configuration that forces all
>> >>> children to die when the father task die.
>> >>>
>> >>> Currently only teh main task dies:
>> >>>
>> >>> nsh> family &
>> >>>
>> >>> nsh> ps
>> >>> PID GROUP PRI POLICY TYPE NPX STATE EVENT SIGMASK
>> >>> STACK
>> >>> COMMAND
>> >>> ...
>> >>> 27 27 100 RR Task --- Waiting Signal 00000000
>> >>> 004032
>> >>> family
>> >>> 28 28 100 RR Task --- Waiting Semaphore 00000000
>> >>> 004032 child1_daemon
>> >>> 29 29 100 RR Task --- Waiting Signal 00000000
>> >>> 004032 child2_daemon
>> >>> 30 30 100 RR Task --- Waiting Signal 00000000
>> >>> 001984 child3_daemon
>> >>>
>> >>> nsh> kill 27
>> >>> nsh> ps
>> >>> PID GROUP PRI POLICY TYPE NPX STATE EVENT SIGMASK
>> >>> STACK
>> >>> COMMAND
>> >>> ...
>> >>> 28 28 100 RR Task --- Waiting Signal 00000000
>> >>> 004032 child1_daemon
>> >>> 29 29 100 RR Task --- Waiting Signal 00000000
>> >>> 004032 child2_daemon
>> >>> 30 30 100 RR Task --- Waiting Signal 00000000
>> >>> 001984 child3_daemon
>> >>>
>> >>> I could setup a signal handling to handle the kill signal in the main
>> >>> task and use it to change the value of some conditional variable that
>> >>> maintain the threads loop of each child running, this is is an
>> >>> option,
>> >>> but maybe there are better option.
>> >>>
>> >>> Please let me know how you are solving this issue.
>> >>>
>> >>> BR,
>> >>>
>> >>> Alan
>> >>>
>> >>
>>
>
