[PATCH] Add __glibc_unlikely hint in lll_trylock, lll_cond_trylock.

[Stefan Liebler]

On 02/06/2017 09:33 AM, Siddhesh Poyarekar wrote:
> On Tuesday 13 December 2016 02:24 PM, Stefan Liebler wrote:
>> Hi,
>>
>> the macros lll_trylock, lll_cond_trylock are extended by a
>> __glibc_unlikely hint. Now the trylock macros are based on the
>> same assumption about a free/busy lock as lll_lock.
>> With the hint gcc emits code in e.g. pthread_mutex_trylock which does
>> not use jumps if the lock is free.  Without the hint it had to jump away
>> if the lock is free.
>>
>> Tested on s390x, ppc.
>>
>> Okay to commit?
>
> Yes, looks good.
>
> Siddhesh
>
Thanks. Committed.