Re: pthread_mutex_timedlock can not be used with CLOCK_MONOTONIC?

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On 2020-04-07 10:22:03 [+0000], Andreas Hoefler wrote:
> The first attempt of a solution was to use a different clock
> (CLOCK_MONOTONIC), which works fine when using conditional attributes
> (pthread_condattr_setclock in combination with pthread_cond_init) but
> unfortunately there does not seem to be a corresponding
> pthread_mutex_setclock(MISSING) for pthread_mutex_init.
>  
> Is there an good alternative for pthread or can the pthread library
> somehow be utilized for this purpose?

>From glibc 2.30 announcement [0]:
|* Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
|  pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
|  functions.  These behave similarly to their "timed" equivalents, but also
|  accept a clockid_t parameter to determine which clock their timeout should
|  be measured against.  All functions allow waiting against CLOCK_MONOTONIC
|  and CLOCK_REALTIME.  The decision of which clock to be used is made at the
|  time of the wait (unlike with pthread_condattr_setclock, which requires
|  the clock choice at initialization time).

You are looking for pthread_mutex_clocklock().

[0] https://sourceware.org/legacy-ml/libc-announce/2019/msg00001.html

> Thanx
> Andy

Sebastian



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