Re: [LTP] Query regarding Open Posix Test Case failure (pthread_rwlock_rdlock)

[Kang Kai <Kai.Kang@windriver.com>]

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On 2012?03?19? 16:11, Jubi Taneja wrote:
> Hi
>
> In LTP(Jan 2012 release) Open Posix Test Suite, the test case 
> "pthread_rwlock_rdlock/2-1.c"
> fails for Linux Kernel 3.0.18 for target ARM.
>
>
> The exact output of the program is:
> main: has priority: 3
> main: attempt read lock
> main: acquired read lock
> main: create wr_thread, with priority: 2
> wr_thread: attempt write lock
> main: create rd_thread, with priority: 1
> rd_thread: attempt read lock
> rd_thread: acquired read lock
> rd_thread: unlock read lock
> Test FAILED: rd_thread did not block on read lock, when a reader owns 
> the lock, and a higher
> priority writer is waiting for the lock

Hi Jubi,

I am using eglibc and meet the same failure. My analysis is that

   This test case is to test option *Thread Execution Scheduling* of 
pthread rwlock.
   But eglibc/libc don't support this option. They provide a 
rwlock->__data.*__flags* option to identify
   perfer 'read lock' or write lock, and the default is 'read lock' 
first. So second reader can get the lock
   when a higher priority writer is waiting for the lock.

Regards,
Kai

>
>
>
> The path of the program si :
> VDLTP_20120104/testcases/open_posix_testsuite/conformance/interfaces/pthread_rwlock_rdlock
>
> Ca anyone please explain why it fails at this point? I am unable to 
> catch the exact reason.
>
> Looking forward to your reply.
>
> Thanks,
> Jubi
>
>
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