Hello,

I use the attached test program to check several POSIX functions which 
use an absolute CLOCK_REALTIME timeout. I noticed that the 
pthread_mutex_timedlock() with clock_settime() test cases doesn't work 
(it doesn't time out when the CLOCK_REALTIME is set past the time out 
time point). The test case works for the other synchronization objects, 
for example semaphores (sem_timedwait()) or condition variables 
(pthread_cond_timedwait()). I am not sure if this is a problem with my 
understanding of the POSIX standard, my test case implementation, or the 
glibc/Linux version. I use Linux 5.3.18.

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