Re: [RESEND PATCH v9] Mutex: Add pthread mutex tunables

[kemi <kemi dot wang at intel dot com>]

On 2018/11/30 上午10:42, kemi wrote:
> 
> 
> On 2018/11/29 下午10:41, Florian Weimer wrote:
>> * Kemi Wang:
>>
>>> +# 	     SXID_ERASE: (default) Don't read for AT_SECURE binaries and
>>> +# 	     		 removed so that child processes can't read it.
>>
>> I think this will not work as intended for libpthread tunables because
>> if libpthread is not linked in, no code in nptl/nptl-init.c ever runs.
>>
> 
> this tunable is for pthread mutex. If the libpthread is not linked in,
> it seems reasonable that we can't use this tunables.
> 
> Why do we need to move to elf/dl-tunables.list and do some tricks?
> 

Or you are talking something on pthread mutex shared within multiple processes?
(pthread_mutexattr_setpshared(mattr,pshared))

In this case, libpthread may not need, and we still hope pthread mutex tunable
works in this case?

>> I think we need to move the tunable to elf/dl-tunables.list, parse it
>> there, and communicate the result to libpthread, possibly via
>> _rtld_global_ro.
>>
>> Thanks,
>> Florian
>>