musl - pthread_mutexattr_getprotocol() issue

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Date: Mon, 7 Dec 2020 10:09:54 +0000
From: Bogdan Nistor <Bogdan.Nistor@...a.com>
To: "musl@...ts.openwall.com" <musl@...ts.openwall.com>
Subject: pthread_mutexattr_getprotocol() issue

Hi,

While using MUSL C-library 1.1.22. we observed an issue with the pthread_mutexattr_getprotocol() implementation. The same implementation is in the latest version also.
When the priority inheritance mutexes were implemented, it seems that pthread_mutexattr_getprotocol() wasn't updated to return the proper mutex protocol type.

The PI mutexes update was done in this commit: http://git.musl-libc.org/cgit/musl/commit/?id=54ca677983d47529bab8752315ac1a2b49888870

If possible, maybe the get protocol function can be updated in a future merge.

In order to fix the get protocol function, we changed it to:
int pthread_mutexattr_getprotocol(const pthread_mutexattr_t *restrict a, int *restrict protocol)
{
   if (a->__attr & 8)
               *protocol = PTHREAD_PRIO_INHERIT;
   else
               *protocol = PTHREAD_PRIO_NONE;
               return 0;
}

Best Regards,
Bogdan Nistor
Software Engineer
Enterprise Business Unit
Email
Bogdan.Nistor@...a.com
Phone
+40 74 517 5795

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