interesting catch. it seems to be a tunable limit.
% grep NFN /sys/src/libthread/note.c
#define NFN 33
static int (*onnote[NFN])(void*, char*);
static int onnotepid[NFN];
for(i=0; i<NFN; i++)
return i<NFN;
for(i=0; i<NFN; i++){
if(i==NFN){
On Fri, Jun 17, 2022 at 8:08 AM <andrey100100...@gmail.com> wrote:
>
> В Пт, 17/06/2022 в 08:11 -0600, Jacob Moody пишет:
> > On 6/17/22 07:46, Thaddeus Woskowiak wrote:
> > > I believe threadnotify() should be called from threadmain() to
> > > properly register the handler in the rendez group
> >
> > This is incorrect, according to thread(2):
> >
> > "The thread library depends on all procs
> > being in the same rendezvous group"
>
>
> From sleep(2):
>
> Alarm causes an alarm note (see notify(2)) to be sent to the
> invoking process after the number of milliseconds given by
> the argument.
>
> Mean to be sent only to the invoking process, NOT to the process group.
>
> >
> > The issue here is that your note handler has to call noted,
> > you are returning from the handler without actually resuming the
> > program.
> > You either need to call noted(NCONT) to resume execution or
> > noted(NDFLT)
> > to stop execution.
> >
> > An excerpt from notify(2):
> >
> > "A notification handler must finish either by exiting the
> > program or by calling noted; if the handler returns the
> > behavior is undefined and probably erroneous."
> >
> > So you are indeed observing undefined behavior.
> >
>
> With:
>
> ------------------------------------
> static int
> handler_alarm(void *, char *msg)
> {
> if(strstr(msg, "alarm")){
> noted(NCONT);
> return 1;
> }
>
> return 0;
> }
> ------------------------------------
>
> result the same:
>
> cpu% 6.out | grep end | wc -l
> 33
>
>
> And noted(NCONT) may be needed, when process recieved many (2 and more)
> notes at once.
>
> May be something wrong with interrupted an incomplete system call?
>
>
> >
> > Hope this helps,
> > moody
> >
>
>
> Regards,
> Andrej
>
------------------------------------------
9fans: 9fans
Permalink:
https://9fans.topicbox.com/groups/9fans/Tfa6823048ad90a21-Mb2e0af1ac4067b7f4649d000
Delivery options: https://9fans.topicbox.com/groups/9fans/subscription
