Re: Building pthreads egg on MacOS

[Jörg F. Wittenberger]

Hi Lassi,

that's a good question!

There has been only so much consideration as to why raise the priority
in the first place: there is exactly one Chicken thread, hence it's a
precious resource.  Let's raise priority.

In other words: I'd expect little harm without it.  Just
inconsistency.  :-/

Darwin being the culprit here, IMHO: in this simplest solution feels
appealing to me.

Anything I'm missing?


Am Wed, 25 Aug 2021 19:38:48 +0300
schrieb Lassi Kortela <lassi@lassi.io>:

> `chicken-install pthreads` fails to compile the following C code on
> Mac:
> 
> void
> C_pthread_pre_init(void *intres)
> {
>    .
>    .
>    .
>    if(pthread_setschedprio(pthread_self(), 
> sched_get_priority_max(sched_getscheduler(0)))) {
>      fprintf(stderr, "Failed to raise main thread priority.\n");
>    }
> }
> 
> because Darwin is missing pthread_setschedprio() and 
> sched_getscheduler() -- even though these are POSIX standard
> functions.
> 
> What should we do?
> 
> https://stackoverflow.com/questions/12056491/how-to-set-thread-priority-pthreads-on-mac-os
>  
> says "You can only set the priority of a thread when you create it
> using pthread_setschedparam()." The current thread (pthread_self())
> has already been created so we probably can't use
> pthread_setschedparam() on it.
> 
> The simplest option would be an #ifdef to comment out the above lines
> of code on Darwin.