* Plan to implement pthread_mutexattr_setprotocol(PRIO_INHERIT)
@ 2019-02-10 8:32 Johann Hanne
2019-02-10 14:52 ` Rich Felker
0 siblings, 1 reply; 2+ messages in thread
From: Johann Hanne @ 2019-02-10 8:32 UTC (permalink / raw)
To: musl
Hi,
are there any plans for an implementation of
pthread_mutexattr_setprotocol(PRIO_INHERIT)?
Am I missing an alternative? My intention is to temporarily boost the
priority of a lower-prio thread in case it is holding a mutex which
prevents a higher-prio thread from running.
Cheers,
Johann
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Plan to implement pthread_mutexattr_setprotocol(PRIO_INHERIT)
2019-02-10 8:32 Plan to implement pthread_mutexattr_setprotocol(PRIO_INHERIT) Johann Hanne
@ 2019-02-10 14:52 ` Rich Felker
0 siblings, 0 replies; 2+ messages in thread
From: Rich Felker @ 2019-02-10 14:52 UTC (permalink / raw)
To: Johann Hanne; +Cc: musl
On Sun, Feb 10, 2019 at 09:32:29AM +0100, Johann Hanne wrote:
> are there any plans for an implementation of
> pthread_mutexattr_setprotocol(PRIO_INHERIT)?
>
> Am I missing an alternative? My intention is to temporarily boost
> the priority of a lower-prio thread in case it is holding a mutex
> which prevents a higher-prio thread from running.
There aren't plans in the sense of a schedule for it happening, but
the intent is that this feature eventually be supported. If there's
something you need it for we can discuss getting it done.
Priority protection (PRIO_PROTECT) on the other hand I'm not so sure
about. Due to lack of any support on the kernel side, the approach
glibc uses for it requires some really fragile memorization and
changing/restoring of thread priorities from userspace. I think it
would need a stronger motivation to overcome reasons for not doing it.
Rich
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-02-10 8:32 Plan to implement pthread_mutexattr_setprotocol(PRIO_INHERIT) Johann Hanne
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