Question regarding __lll_timedlock_elision (__lll_clocklock_elision) on x86/powerpc/s390

Question regarding __lll_timedlock_elision (__lll_clocklock_elision) on x86/powerpc/s390

[Lukasz Majewski]

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Dear Community,

I'm trying to find the implementation of __lll_clocklock_elision
function declared as

extern int __lll_clocklock_elision (int *futex, short *adapt_count,
					clockid_t clockid,
					const struct timespec *timeout,
					int private) attribute_hidden;

in sysdeps/unix/sysv/linux/x86/lowlevellock.h

I've dug into following commit:

"Add the low level infrastructure for pthreads lock elision with TSX"
SHA1: 1cdbe579482c07e9f4bb3baa4864da2d3e

Where this extern declaration is added for the first time, before
rename as __lll_timedlock_elision.

However, I cannot find the definition in the source code (it is also
not the auto generated syscall wrapper).

Is this function provided from some other library? (It shall NOT be as
it is declared with 'attribute hidden').

I do need to find its definition to provide Y2038 support for it. The
same situation is with with powerpc  and s390 ports.

Any help/hints appreciated. 

Best regards,

Lukasz Majewski

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Re: Question regarding __lll_timedlock_elision (__lll_clocklock_elision) on x86/powerpc/s390

[Florian Weimer]

* Lukasz Majewski:

> Dear Community,
>
> I'm trying to find the implementation of __lll_clocklock_elision
> function declared as
>
> extern int __lll_clocklock_elision (int *futex, short *adapt_count,
> 					clockid_t clockid,
> 					const struct timespec *timeout,
> 					int private) attribute_hidden;
>
> in sysdeps/unix/sysv/linux/x86/lowlevellock.h
>
> I've dug into following commit:
>
> "Add the low level infrastructure for pthreads lock elision with TSX"
> SHA1: 1cdbe579482c07e9f4bb3baa4864da2d3e
>
> Where this extern declaration is added for the first time, before
> rename as __lll_timedlock_elision.
>
> However, I cannot find the definition in the source code (it is also
> not the auto generated syscall wrapper).

See sysdeps/unix/sysv/linux/s390/elision-timed.c, it does:

#define __lll_lock_elision __lll_clocklock_elision
…
#include "elision-lock.c"