use libc::{c_long, getpid, syscall, SYS_gettid};

pub fn is_main_thread() -> bool
{
    let ttid = unsafe { syscall(SYS_gettid) };

    let pid = c_long::from(unsafe { getpid() });

    ttid == pid
}

macro_rules! enum_from_repr {
    (
        #[repr($repr: ident)]
        $(#[$attr: meta])*
        $visibility: vis enum $name: ident
        {
            $($variant: ident = $raw: path,)*
        }
    ) => {
        $(#[$attr])*
        #[repr($repr)]
        $visibility enum $name
        {
            $($variant = $raw,)*
        }

        impl $name
        {
            fn from_repr(repr: $repr) -> Option<Self>
            {
                match repr {
                    $($raw => Some(Self::$variant),)*
                    _ => None
                }
            }
        }
    };
}

pub(crate) use enum_from_repr;