Fix futex support on OpenBSD

[brad0]

Description

OpenBSD no longer supports direct syscalls.

openbsd/src@cafeb89

Type of change

• bug fix - change that fixes an issue
• new feature - change that adds functionality
• tests - change in tests
• infrastructure - change in infrastructure and CI
• documentation - documentation update

Tests

• added - required for new features and some bug fixes
• not needed

Documentation

• updated in # - add PR number
• needs to be updated
• not needed

Breaks backward compatibility

• Yes
• No
• Unknown

[pavelkumbrasev]

Please correct the copyright year

[akukanov]

@pavelkumbrasev Are systems that do not have futex still in support? If not, it might make sense to keep only the new implementation. Or maybe replace the check for OpenBSD with a check for presence of futex if such can be made.

[pavelkumbrasev]

@pavelkumbrasev Are systems that do not have futex still in support?

That's a good question we have never discussed this specific requirement: #if defined(SYS_futex)

[brad0]

That's a good question we have never discussed this specific requirement: #if defined(SYS_futex)

@pavelkumbrasev I was looking at that and although that does apply for OpenBSD at the moment that isn't necessarily the case in the future.

[brad0]

@pavelkumbrasev Let me know if updating the copyright alone is Ok or if you want to go in some other direction based off of this.

[pavelkumbrasev]

Since futex is still present on the OS I think this approach is fine. The only question: will this approach affect older versions of OpenBSD or it will work just fine?
(Copyright year should be fixed)

[brad0]

Since futex is still present on the OS I think this approach is fine. The only question: will this approach affect older versions of OpenBSD or it will work just fine? (Copyright year should be fixed)

It is fine for any version of OpenBSD that has futex support, 14 releases.

[brad0]

@pavelkumbrasev Ping.