Fix futex support on OpenBSD.

[brad0]

No indirect syscalls are allowed. The futex() function which issues
a direct syscall is required.

https://man.openbsd.org/futex

[Lastique]

On May 18, 2024 10:58:31 AM Brad Smith ***@***.***> wrote: No indirect syscalls are allowed. The futex() function which issues a direct syscall is required.

Could you provide more details? What do you mean by "not allowed"? Does invoking the syscall directly not work? What is the error? Also, is the futex wrapper function universally available on OpenBSD?

[brad0]

On May 18, 2024 10:58:31 AM Brad Smith @.***> wrote: No indirect syscalls are allowed. The futex() function which issues a direct syscall is required.
Could you provide more details? What do you mean by "not allowed"? Does invoking the syscall directly not work? What is the error? Also, is the futex wrapper function universally available on OpenBSD?

As in support for syscall(2) has been removed.

openbsd/src@cafeb89

Yes, it is.

[Lastique]

Also, is the futex wrapper function universally available on OpenBSD?

Yes, it is.

No, it's not. Apparently, futex only appeared in OpenBSD 6.2. The current code tests that by means of testing whether the syscall number is defined.

[Lastique]

Can you test if 6ee3138 works on OpenBSD?

[brad0]

Can you test if 6ee3138 works on OpenBSD?

That looks fine and builds on -current.