wasmer_wasix/syscalls/wasix/
thread_join.rs

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use std::task::Waker;

use super::*;
use crate::syscalls::*;

/// ### `thread_join()`
/// Joins this thread with another thread, blocking this
/// one until the other finishes
///
/// ## Parameters
///
/// * `tid` - Handle of the thread to wait on
//#[instrument(level = "trace", skip_all, fields(%join_tid), ret)]
pub fn thread_join<M: MemorySize + 'static>(
    mut ctx: FunctionEnvMut<'_, WasiEnv>,
    join_tid: Tid,
) -> Result<Errno, WasiError> {
    WasiEnv::do_pending_operations(&mut ctx)?;

    thread_join_internal::<M>(ctx, join_tid)
}

pub(super) fn thread_join_internal<M: MemorySize + 'static>(
    mut ctx: FunctionEnvMut<'_, WasiEnv>,
    join_tid: Tid,
) -> Result<Errno, WasiError> {
    if let Some(_child_exit_code) = unsafe { handle_rewind::<M, i32>(&mut ctx) } {
        return Ok(Errno::Success);
    }

    ctx = wasi_try_ok!(maybe_snapshot::<M>(ctx)?);

    let env = ctx.data();
    let tid: WasiThreadId = join_tid.into();
    let other_thread = env.process.get_thread(&tid);
    if let Some(other_thread) = other_thread {
        let res = __asyncify_with_deep_sleep::<M, _, _>(ctx, async move {
            other_thread
                .join()
                .await
                .map_err(|err| err.as_exit_code().unwrap_or(ExitCode::from(Errno::Unknown)))
                .unwrap_or_else(|a| a)
                .raw()
        })?;
        Ok(Errno::Success)
    } else {
        Ok(Errno::Success)
    }
}