//! Data structures for process management

use core::time::Duration;

use crate::{impl_place_lifetime, io::FileMode};

mod exit;
mod signal;
mod spawn;

pub use exit::ExitCode;
pub use signal::{Signal, SignalEntryData};
pub use spawn::{ExecveOptions, SpawnOption, SpawnOptions, ThreadSpawnOptions};

/// Describes a single mutex operation
#[derive(Clone, Debug)]
#[repr(C)]
pub enum MutexOperation {
    /// Waits on the mutex object until it is different from "compare value"
    Wait(u32, Option<Duration>),
    /// Wakes a single mutex-waiting thread
    Wake,
    /// Wakes all threads waiting on the mutex
    WakeAll,
}

/// Provides some amount of process-related information
#[derive(Clone, Debug)]
pub enum ProcessInfoElement {
    /// Mask applied to file modes when creating new files/directories
    Umask(FileMode),
}

// TODO not sure if I really need #[repr(C)] ABI here
impl_place_lifetime! {
    #[doc = "Argument struct passed from the kernel to a spawned process"]
    #[derive(Debug)]
    pub struct ProgramArgumentInner<'a> {
        #[doc = "Argument list"]
        pub args: &'a [&'a str],
        #[doc = "List of KEY=VALUE environment variable pairs"]
        pub env: &'a [&'a str],
    }
}