[RFC][BZ #16549] Add sanity check for condvar alignment.

[Ondřej Bílka]

On Tue, Feb 11, 2014 at 05:07:30PM +0100, Florian Weimer wrote:
> On 02/11/2014 01:43 PM, Ondřej Bílka wrote:
> 
> >A more conservative solution is add assert in initialization to check
> >alignment. Following patch does that, should be same check added for
> >mutex/semaphores?
> 
> I think the real issue here is our lack of error checking for the
> futex system call.  strace on the test case shows this:
> 
> [pid 12278] futex(0x6010cd, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EINVAL
> (Invalid argument)
> 
That is also a problem. I would prefer to fail early in init to handle
cases like when wait lies in cold path and problem would manifest only rarely.

Checking return value of timedwait now would require to modify custom
assembly implementation. I will ask in separate thread why that
implementation is needed.